583 lines
21 KiB
C++
583 lines
21 KiB
C++
#include "cmPolicies.h"
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#include "cmake.h"
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#include "cmMakefile.h"
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#include "cmSourceFile.h"
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#include "cmVersion.h"
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#include <map>
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#include <set>
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#include <queue>
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#include <assert.h>
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const char* cmPolicies::PolicyStatusNames[] = {
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"OLD", "WARN", "NEW", "REQUIRED_IF_USED", "REQUIRED_ALWAYS"
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};
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class cmPolicy
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{
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public:
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cmPolicy(cmPolicies::PolicyID iD,
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const char *idString,
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const char *shortDescription,
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const char *longDescription,
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unsigned int majorVersionIntroduced,
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unsigned int minorVersionIntroduced,
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unsigned int patchVersionIntroduced,
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cmPolicies::PolicyStatus status)
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{
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if (!idString || !shortDescription || ! longDescription)
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{
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cmSystemTools::Error("Attempt to define a policy without "
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"all parameters being specified!");
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return;
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}
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this->ID = iD;
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this->IDString = idString;
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this->ShortDescription = shortDescription;
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this->LongDescription = longDescription;
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this->MajorVersionIntroduced = majorVersionIntroduced;
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this->MinorVersionIntroduced = minorVersionIntroduced;
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this->PatchVersionIntroduced = patchVersionIntroduced;
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this->Status = status;
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}
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std::string GetVersionString()
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{
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cmOStringStream error;
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error << this->MajorVersionIntroduced << "." <<
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this->MinorVersionIntroduced << "." <<
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this->PatchVersionIntroduced;
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return error.str();
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}
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bool IsPolicyNewerThan(unsigned int majorV,
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unsigned int minorV,
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unsigned int patchV)
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{
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if (majorV < this->MajorVersionIntroduced)
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{
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return true;
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}
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if (majorV > this->MajorVersionIntroduced)
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{
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return false;
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}
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if (minorV < this->MinorVersionIntroduced)
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{
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return true;
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}
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if (minorV > this->MinorVersionIntroduced)
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{
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return false;
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}
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return (patchV < this->PatchVersionIntroduced);
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}
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cmPolicies::PolicyID ID;
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std::string IDString;
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std::string ShortDescription;
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std::string LongDescription;
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unsigned int MajorVersionIntroduced;
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unsigned int MinorVersionIntroduced;
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unsigned int PatchVersionIntroduced;
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cmPolicies::PolicyStatus Status;
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};
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cmPolicies::cmPolicies()
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{
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// define all the policies
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this->DefinePolicy(
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CMP0000, "CMP0000",
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"A policy version number must be specified.",
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"CMake requires that projects specify the version of CMake to which "
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"they have been written. "
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"This policy has been put in place to help existing projects build with "
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"new CMake versions as it evolves. "
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"The easiest way to specify a policy version number is to "
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"call the cmake_minimum_required command at the top of "
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"your CMakeLists.txt file:\n"
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" cmake_minimum_required(VERSION <major>.<minor>)\n"
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"where \"<major>.<minor>\" is the version of CMake you want to support "
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"(such as \"2.6\"). "
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"The command will ensure that at least the given version of CMake is "
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"running and set the policy version. "
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"See documentation of cmake_minimum_required for details. "
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"The cmake_policy command may be used at any time to set the "
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"policy version:\n"
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" cmake_policy(VERSION <major>.<minor>)\n"
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"This is the recommended way to set the policy version except at "
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"the very top of a project.",
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2,6,0, cmPolicies::WARN
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);
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this->DefinePolicy(
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CMP0001, "CMP0001",
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"CMAKE_BACKWARDS_COMPATIBILITY should no longer be used.",
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"The OLD behavior is to check CMAKE_BACKWARDS_COMPATIBILITY and present "
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"it to the user. "
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"The NEW behavior is to ignore CMAKE_BACKWARDS_COMPATIBILITY "
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"completely.\n"
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"In CMake 2.4 and below the variable CMAKE_BACKWARDS_COMPATIBILITY was "
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"used to request compatibility with earlier versions of CMake. "
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"In CMake 2.6 and above all compatibility issues are handled by policies "
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"and the cmake_policy command. "
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"However, CMake must still check CMAKE_BACKWARDS_COMPATIBILITY for "
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"projects written for CMake 2.4 and below.",
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2,6,0, cmPolicies::WARN
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);
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this->DefinePolicy(
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CMP0002, "CMP0002",
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"Logical target names must be globally unique.",
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"Targets names created with "
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"add_executable, add_library, or add_custom_target "
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"are logical build target names. "
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"Logical target names must be globally unique because:\n"
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" - Unique names may be referenced unambiguously both in CMake\n"
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" code and on make tool command lines.\n"
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" - Logical names are used by Xcode and VS IDE generators\n"
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" to produce meaningful project names for the targets.\n"
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"The logical name of executable and library targets does not "
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"have to correspond to the physical file names built. "
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"Consider using the OUTPUT_NAME target property to create two "
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"targets with the same physical name while keeping logical "
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"names distinct. "
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"Custom targets must simply have globally unique names (unless one "
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"uses the global property ALLOW_DUPLICATE_CUSTOM_TARGETS with a "
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"Makefiles generator).",
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2,6,0, cmPolicies::WARN
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);
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this->DefinePolicy(
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CMP0003, "CMP0003",
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"Libraries linked via full path no longer produce linker search paths.",
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"This policy affects how libraries whose full paths are NOT known "
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"are found at link time, but was created due to a change in how CMake "
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"deals with libraries whose full paths are known. "
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"Consider the code\n"
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" target_link_libraries(myexe /path/to/libA.so)\n"
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"CMake 2.4 and below implemented linking to libraries whose full paths "
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"are known by splitting them on the link line into separate components "
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"consisting of the linker search path and the library name. "
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"The example code might have produced something like\n"
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" ... -L/path/to -lA ...\n"
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"in order to link to library A. "
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"An analysis was performed to order multiple link directories such that "
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"the linker would find library A in the desired location, but there "
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"are cases in which this does not work. "
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"CMake versions 2.6 and above use the more reliable approach of passing "
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"the full path to libraries directly to the linker in most cases. "
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"The example code now produces something like\n"
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" ... /path/to/libA.so ....\n"
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"Unfortunately this change can break code like\n"
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" target_link_libraries(myexe /path/to/libA.so B)\n"
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"where \"B\" is meant to find \"/path/to/libB.so\". "
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"This code is wrong because the user is asking the linker to find "
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"library B but has not provided a linker search path (which may be "
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"added with the link_directories command). "
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"However, with the old linking implementation the code would work "
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"accidentally because the linker search path added for library A "
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"allowed library B to be found."
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"\n"
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"In order to support projects depending on linker search paths "
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"added by linking to libraries with known full paths, the OLD "
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"behavior for this policy will add the linker search paths even "
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"though they are not needed for their own libraries. "
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"When this policy is set to OLD, CMake will produce a link line such as\n"
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" ... -L/path/to /path/to/libA.so -lB ...\n"
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"which will allow library B to be found as it was previously. "
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"When this policy is set to NEW, CMake will produce a link line such as\n"
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" ... /path/to/libA.so -lB ...\n"
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"which more accurately matches what the project specified."
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"\n"
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"The setting for this policy used when generating the link line is that "
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"in effect when the target is created by an add_executable or "
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"add_library command. For the example described above, the code\n"
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" cmake_policy(SET CMP0003 OLD) # or cmake_policy(VERSION 2.4)\n"
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" add_executable(myexe myexe.c)\n"
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" target_link_libraries(myexe /path/to/libA.so B)\n"
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"will work and suppress the warning for this policy. "
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"It may also be updated to work with the corrected linking approach:\n"
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" cmake_policy(SET CMP0003 NEW) # or cmake_policy(VERSION 2.6)\n"
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" link_directories(/path/to) # needed to find library B\n"
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" add_executable(myexe myexe.c)\n"
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" target_link_libraries(myexe /path/to/libA.so B)\n"
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"Even better, library B may be specified with a full path:\n"
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" add_executable(myexe myexe.c)\n"
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" target_link_libraries(myexe /path/to/libA.so /path/to/libB.so)\n"
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"When all items on the link line have known paths CMake does not check "
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"this policy so it has no effect.",
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2,6,0, cmPolicies::WARN);
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this->DefinePolicy(
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CMP0004, "CMP0004",
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"Libraries linked may not have leading or trailing whitespace.",
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"CMake versions 2.4 and below silently removed leading and trailing "
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"whitespace from libraries linked with code like\n"
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" target_link_libraries(myexe \" A \")\n"
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"This could lead to subtle errors in user projects.\n"
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"The OLD behavior for this policy is to silently remove leading and "
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"trailing whitespace. "
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"The NEW behavior for this policy is to diagnose the existence of "
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"such whitespace as an error. "
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"The setting for this policy used when checking the library names is "
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"that in effect when the target is created by an add_executable or "
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"add_library command.",
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2,6,0, cmPolicies::WARN);
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this->DefinePolicy(
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CMP0005, "CMP0005",
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"Preprocessor definition values are now escaped automatically.",
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"This policy determines whether or not CMake should generate escaped "
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"preprocessor definition values added via add_definitions. "
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"CMake versions 2.4 and below assumed that only trivial values would "
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"be given for macros in add_definitions calls. "
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"It did not attempt to escape non-trivial values such as string "
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"literals in generated build rules. "
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"CMake versions 2.6 and above support escaping of most values, but "
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"cannot assume the user has not added escapes already in an attempt to "
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"work around limitations in earlier versions.\n"
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"The OLD behavior for this policy is to place definition values given "
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"to add_definitions directly in the generated build rules without "
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"attempting to escape anything. "
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"The NEW behavior for this policy is to generate correct escapes "
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"for all native build tools automatically. "
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"See documentation of the COMPILE_DEFINITIONS target property for "
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"limitations of the escaping implementation.",
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2,6,0, cmPolicies::WARN);
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}
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cmPolicies::~cmPolicies()
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{
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// free the policies
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std::map<cmPolicies::PolicyID,cmPolicy *>::iterator i
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= this->Policies.begin();
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for (;i != this->Policies.end(); ++i)
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{
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delete i->second;
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}
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}
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void cmPolicies::DefinePolicy(cmPolicies::PolicyID iD,
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const char *idString,
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const char *shortDescription,
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const char *longDescription,
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unsigned int majorVersionIntroduced,
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unsigned int minorVersionIntroduced,
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unsigned int patchVersionIntroduced,
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cmPolicies::PolicyStatus status)
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{
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// a policy must be unique and can only be defined once
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if (this->Policies.find(iD) != this->Policies.end())
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{
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cmSystemTools::Error("Attempt to redefine a CMake policy for policy "
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"ID ", this->GetPolicyIDString(iD).c_str());
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return;
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}
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this->Policies[iD] = new cmPolicy(iD, idString,
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shortDescription,
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longDescription,
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majorVersionIntroduced,
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minorVersionIntroduced,
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patchVersionIntroduced,
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status);
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this->PolicyStringMap[idString] = iD;
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}
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bool cmPolicies::ApplyPolicyVersion(cmMakefile *mf,
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const char *version)
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{
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std::string ver = "2.4.0";
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if (version && strlen(version) > 0)
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{
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ver = version;
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}
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unsigned int majorVer = 2;
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unsigned int minorVer = 0;
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unsigned int patchVer = 0;
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// parse the string
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if(sscanf(ver.c_str(), "%u.%u.%u",
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&majorVer, &minorVer, &patchVer) < 2)
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{
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return false;
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}
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// it is an error if the policy version is less than 2.4
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if (majorVer < 2 || majorVer == 2 && minorVer < 4)
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{
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mf->IssueMessage(cmake::FATAL_ERROR,
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"An attempt was made to set the policy version of CMake to something "
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"earlier than \"2.4\". "
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"In CMake 2.4 and below backwards compatibility was handled with the "
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"CMAKE_BACKWARDS_COMPATIBILITY variable. "
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"In order to get compatibility features supporting versions earlier "
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"than 2.4 set policy CMP0001 to OLD to tell CMake to check the "
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"CMAKE_BACKWARDS_COMPATIBILITY variable. "
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"One way to so this is to set the policy version to 2.4 exactly."
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);
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}
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// now loop over all the policies and set them as appropriate
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std::map<cmPolicies::PolicyID,cmPolicy *>::iterator i
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= this->Policies.begin();
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for (;i != this->Policies.end(); ++i)
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{
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if (i->second->IsPolicyNewerThan(majorVer,minorVer,patchVer))
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{
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if (!mf->SetPolicy(i->second->ID, cmPolicies::WARN))
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{
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return false;
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}
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}
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else
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{
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if (!mf->SetPolicy(i->second->ID, cmPolicies::NEW))
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{
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return false;
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}
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}
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}
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return true;
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}
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// is this a valid status the listfile can set this policy to?
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bool cmPolicies::IsValidPolicyStatus(cmPolicies::PolicyID id,
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cmPolicies::PolicyStatus status)
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{
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// if they are setting a feature to anything other than OLD or WARN and the
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// feature is not known about then that is an error
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if (this->Policies.find(id) == this->Policies.end())
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{
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if (status == cmPolicies::WARN ||
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status == cmPolicies::OLD)
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{
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return true;
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}
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cmOStringStream error;
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error <<
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"Error: an attempt was made to enable the new behavior for " <<
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"a new feature that is in a later version of CMake than "
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"what you are runing, please upgrade to a newer version "
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"of CMake.";
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cmSystemTools::Error(error.str().c_str());
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return false;
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}
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// now we know the feature is defined, so the only issue is if someone is
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// setting it to WARN or OLD when the feature is REQUIRED_ALWAYS
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if ((status == cmPolicies::WARN ||
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status == cmPolicies::OLD) &&
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this->Policies[id]->Status == cmPolicies::REQUIRED_ALWAYS)
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{
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cmOStringStream error;
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error <<
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"Error: an attempt was made to enable the old behavior for " <<
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"a feature that is no longer supported. The feature in " <<
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"question is feature " <<
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id <<
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" which had new behavior introduced in CMake version " <<
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this->Policies[id]->GetVersionString() <<
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" please either update your CMakeLists files to conform to " <<
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"the new behavior " <<
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"or use an older version of CMake that still supports " <<
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"the old behavior. Run cmake --help-policies " <<
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id << " for more information.";
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cmSystemTools::Error(error.str().c_str());
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return false;
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}
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return true;
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}
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// is this a valid status the listfile can set this policy to?
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bool cmPolicies::IsValidUsedPolicyStatus(cmPolicies::PolicyID id,
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cmPolicies::PolicyStatus status)
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{
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// if they are setting a feature to anything other than OLD or WARN and the
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// feature is not known about then that is an error
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if (this->Policies.find(id) == this->Policies.end())
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{
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if (status == cmPolicies::WARN ||
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status == cmPolicies::OLD)
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{
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return true;
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}
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cmOStringStream error;
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error <<
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"Error: an attempt was made to enable the new behavior for " <<
|
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"a new feature that is in a later version of CMake than "
|
|
"what you are runing, please upgrade to a newer version "
|
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"of CMake.";
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cmSystemTools::Error(error.str().c_str());
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return false;
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}
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|
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// now we know the feature is defined, so the only issue is if someone is
|
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// setting it to WARN or OLD when the feature is REQUIRED_ALWAYS
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if ((status == cmPolicies::WARN ||
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status == cmPolicies::OLD) &&
|
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(this->Policies[id]->Status == cmPolicies::REQUIRED_ALWAYS ||
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this->Policies[id]->Status == cmPolicies::REQUIRED_IF_USED))
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{
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cmOStringStream error;
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error <<
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"Error: an attempt was made to enable the old behavior for " <<
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"a feature that is no longer supported. The feature in " <<
|
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"question is feature " <<
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id <<
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" which had new behavior introduced in CMake version " <<
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this->Policies[id]->GetVersionString() <<
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" please either update your CMakeLists files to conform to " <<
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"the new behavior " <<
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"or use an older version of CMake that still supports " <<
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"the old behavior. Run cmake --help-policies " <<
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id << " for more information.";
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cmSystemTools::Error(error.str().c_str());
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return false;
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}
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return true;
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}
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bool cmPolicies::GetPolicyID(const char *id, cmPolicies::PolicyID &pid)
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{
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if (!id || strlen(id) < 1)
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{
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return false;
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}
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std::map<std::string,cmPolicies::PolicyID>::iterator pos =
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this->PolicyStringMap.find(id);
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if (pos == this->PolicyStringMap.end())
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{
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return false;
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}
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pid = pos->second;
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return true;
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}
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std::string cmPolicies::GetPolicyIDString(cmPolicies::PolicyID pid)
|
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{
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std::map<cmPolicies::PolicyID,cmPolicy *>::iterator pos =
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this->Policies.find(pid);
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if (pos == this->Policies.end())
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{
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return "";
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}
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return pos->second->IDString;
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}
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|
|
|
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///! return a warning string for a given policy
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std::string cmPolicies::GetPolicyWarning(cmPolicies::PolicyID id)
|
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{
|
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std::map<cmPolicies::PolicyID,cmPolicy *>::iterator pos =
|
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this->Policies.find(id);
|
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if (pos == this->Policies.end())
|
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{
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cmSystemTools::Error(
|
|
"Request for warning text for undefined policy!");
|
|
return "Request for warning text for undefined policy!";
|
|
}
|
|
|
|
cmOStringStream msg;
|
|
msg <<
|
|
"Policy " << pos->second->IDString << " is not set: "
|
|
"" << pos->second->ShortDescription << " "
|
|
"Run \"cmake --help-policy " << pos->second->IDString << "\" for "
|
|
"policy details. "
|
|
"Use the cmake_policy command to set the policy "
|
|
"and suppress this warning.";
|
|
return msg.str();
|
|
}
|
|
|
|
|
|
///! return an error string for when a required policy is unspecified
|
|
std::string cmPolicies::GetRequiredPolicyError(cmPolicies::PolicyID id)
|
|
{
|
|
std::map<cmPolicies::PolicyID,cmPolicy *>::iterator pos =
|
|
this->Policies.find(id);
|
|
if (pos == this->Policies.end())
|
|
{
|
|
cmSystemTools::Error(
|
|
"Request for error text for undefined policy!");
|
|
return "Request for warning text for undefined policy!";
|
|
}
|
|
|
|
cmOStringStream error;
|
|
error <<
|
|
"Policy " << pos->second->IDString << " is not set to NEW: "
|
|
"" << pos->second->ShortDescription << " "
|
|
"Run \"cmake --help-policy " << pos->second->IDString << "\" for "
|
|
"policy details. "
|
|
"CMake now requires this policy to be set to NEW by the project. "
|
|
"The policy may be set explicitly using the code\n"
|
|
" cmake_policy(SET " << pos->second->IDString << " NEW)\n"
|
|
"or by upgrading all policies with the code\n"
|
|
" cmake_policy(VERSION " << pos->second->GetVersionString() <<
|
|
") # or later\n"
|
|
"Run \"cmake --help-command cmake_policy\" for more information.";
|
|
return error.str();
|
|
}
|
|
|
|
///! Get the default status for a policy
|
|
cmPolicies::PolicyStatus
|
|
cmPolicies::GetPolicyStatus(cmPolicies::PolicyID id)
|
|
{
|
|
// if the policy is not know then what?
|
|
std::map<cmPolicies::PolicyID,cmPolicy *>::iterator pos =
|
|
this->Policies.find(id);
|
|
if (pos == this->Policies.end())
|
|
{
|
|
// TODO is this right?
|
|
return cmPolicies::WARN;
|
|
}
|
|
|
|
return pos->second->Status;
|
|
}
|
|
|
|
void cmPolicies::GetDocumentation(std::vector<cmDocumentationEntry>& v)
|
|
{
|
|
// now loop over all the policies and set them as appropriate
|
|
std::map<cmPolicies::PolicyID,cmPolicy *>::iterator i
|
|
= this->Policies.begin();
|
|
for (;i != this->Policies.end(); ++i)
|
|
{
|
|
cmOStringStream full;
|
|
full << i->second->LongDescription;
|
|
full << "\nThis policy was introduced in CMake version ";
|
|
full << i->second->GetVersionString() << ". ";
|
|
full << "CMake version " << cmVersion::GetMajorVersion()
|
|
<< "." << cmVersion::GetMinorVersion() << " ";
|
|
// add in some more text here based on status
|
|
switch (i->second->Status)
|
|
{
|
|
case cmPolicies::WARN:
|
|
full << "defaults to WARN for this policy. "
|
|
<< "Use the cmake_policy command to set it to OLD or NEW.";
|
|
break;
|
|
case cmPolicies::OLD:
|
|
full << "defaults to the OLD behavior for this policy.";
|
|
break;
|
|
case cmPolicies::NEW:
|
|
full << "defaults to the NEW behavior for this policy.";
|
|
break;
|
|
case cmPolicies::REQUIRED_IF_USED:
|
|
full << "requires the policy to be set to NEW if you use it. "
|
|
<< "Use the cmake_policy command to set it to NEW.";
|
|
break;
|
|
case cmPolicies::REQUIRED_ALWAYS:
|
|
full << "requires the policy to be set to NEW. "
|
|
<< "Use the cmake_policy command to set it to NEW.";
|
|
break;
|
|
}
|
|
|
|
cmDocumentationEntry e(i->second->IDString.c_str(),
|
|
i->second->ShortDescription.c_str(),
|
|
full.str().c_str());
|
|
v.push_back(e);
|
|
}
|
|
}
|