CMake/Source/cmPolicies.cxx

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#include "cmPolicies.h"
#include "cmake.h"
#include "cmMakefile.h"
#include "cmSourceFile.h"
#include "cmVersion.h"
#include <map>
#include <set>
#include <queue>
#include <assert.h>
const char* cmPolicies::PolicyStatusNames[] = {
"OLD", "WARN", "NEW", "REQUIRED_IF_USED", "REQUIRED_ALWAYS"
};
class cmPolicy
{
public:
cmPolicy(cmPolicies::PolicyID iD,
const char *idString,
const char *shortDescription,
const char *longDescription,
unsigned int majorVersionIntroduced,
unsigned int minorVersionIntroduced,
unsigned int patchVersionIntroduced,
cmPolicies::PolicyStatus status)
{
if (!idString || !shortDescription || ! longDescription)
{
cmSystemTools::Error("Attempt to define a policy without "
"all parameters being specified!");
return;
}
this->ID = iD;
this->IDString = idString;
this->ShortDescription = shortDescription;
this->LongDescription = longDescription;
this->MajorVersionIntroduced = majorVersionIntroduced;
this->MinorVersionIntroduced = minorVersionIntroduced;
this->PatchVersionIntroduced = patchVersionIntroduced;
this->Status = status;
}
std::string GetVersionString()
{
cmOStringStream error;
error << this->MajorVersionIntroduced << "." <<
this->MinorVersionIntroduced << "." <<
this->PatchVersionIntroduced;
return error.str();
}
bool IsPolicyNewerThan(unsigned int majorV,
unsigned int minorV,
unsigned int patchV)
{
if (majorV < this->MajorVersionIntroduced)
{
return true;
}
if (majorV > this->MajorVersionIntroduced)
{
return false;
}
if (minorV < this->MinorVersionIntroduced)
{
return true;
}
if (minorV > this->MinorVersionIntroduced)
{
return false;
}
return (patchV < this->PatchVersionIntroduced);
}
cmPolicies::PolicyID ID;
std::string IDString;
std::string ShortDescription;
std::string LongDescription;
unsigned int MajorVersionIntroduced;
unsigned int MinorVersionIntroduced;
unsigned int PatchVersionIntroduced;
cmPolicies::PolicyStatus Status;
};
cmPolicies::cmPolicies()
{
// define all the policies
this->DefinePolicy(
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CMP0000, "CMP0000",
"A policy version number must be specified.",
"CMake requires that projects specify the version of CMake to which "
"they have been written. "
"This policy has been put in place to help CMake maintain backwards "
"compatibility with existing projects while allowing it to evolve "
"more rapidly.\n"
"The easiest way to specify a policy version number is to "
"call the cmake_policy command at the top of your CMakeLists file:\n"
" cmake_policy(VERSION <major>.<minor>)\n"
"where <major>.<minor> is the version of CMake you want to support. "
"The cmake_minimum_required command may also be used; see its "
"documentation for details.",
2,6,0, cmPolicies::WARN
);
this->DefinePolicy(
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CMP0001, "CMP0001",
"CMAKE_BACKWARDS_COMPATIBILITY should no longer be used.",
"The OLD behavior is to check CMAKE_BACKWARDS_COMPATIBILITY and present "
"it to the user. "
"The NEW behavior is to ignore CMAKE_BACKWARDS_COMPATIBILITY "
"completely.\n"
"In CMake 2.4 and below the variable CMAKE_BACKWARDS_COMPATIBILITY was "
"used to request compatibility with earlier versions of CMake. "
"In CMake 2.6 and above all compatibility issues are handled by policies "
"and the cmake_policy command. "
"However, CMake must still check CMAKE_BACKWARDS_COMPATIBILITY for "
"projects written for CMake 2.4 and below.",
2,6,0, cmPolicies::WARN
);
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this->DefinePolicy(
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CMP0002, "CMP0002",
"Logical target names must be globally unique.",
"Targets names created with "
"add_executable, add_library, or add_custom_target "
"are logical build target names. "
"Logical target names must be globally unique because:\n"
" - Unique names may be referenced unambiguously both in CMake\n"
" code and on make tool command lines.\n"
" - Logical names are used by Xcode and VS IDE generators\n"
" to produce meaningful project names for the targets.\n"
"The logical name of executable and library targets does not "
"have to correspond to the physical file names built. "
"Consider using the OUTPUT_NAME target property to create two "
"targets with the same physical name while keeping logical "
"names distinct. "
"Custom targets must simply have globally unique names (unless one "
"uses the global property ALLOW_DUPLICATE_CUSTOM_TARGETS with a "
"Makefiles generator).",
2,6,0, cmPolicies::WARN
);
}
cmPolicies::~cmPolicies()
{
// free the policies
std::map<cmPolicies::PolicyID,cmPolicy *>::iterator i
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= this->Policies.begin();
for (;i != this->Policies.end(); ++i)
{
delete i->second;
}
}
void cmPolicies::DefinePolicy(cmPolicies::PolicyID iD,
const char *idString,
const char *shortDescription,
const char *longDescription,
unsigned int majorVersionIntroduced,
unsigned int minorVersionIntroduced,
unsigned int patchVersionIntroduced,
cmPolicies::PolicyStatus status)
{
// a policy must be unique and can only be defined once
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if (this->Policies.find(iD) != this->Policies.end())
{
cmSystemTools::Error("Attempt to redefine a CMake policy for policy "
"ID ", this->GetPolicyIDString(iD).c_str());
return;
}
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this->Policies[iD] = new cmPolicy(iD, idString,
shortDescription,
longDescription,
majorVersionIntroduced,
minorVersionIntroduced,
patchVersionIntroduced,
status);
this->PolicyStringMap[idString] = iD;
}
bool cmPolicies::ApplyPolicyVersion(cmMakefile *mf,
const char *version)
{
std::string ver = "2.4.0";
if (version && strlen(version) > 0)
{
ver = version;
}
unsigned int majorVer = 2;
unsigned int minorVer = 0;
unsigned int patchVer = 0;
// parse the string
if(sscanf(ver.c_str(), "%u.%u.%u",
&majorVer, &minorVer, &patchVer) < 2)
{
return false;
}
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// it is an error if the policy version is less than 2.4
if (majorVer < 2 || majorVer == 2 && minorVer < 4)
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{
mf->IssueMessage(cmake::FATAL_ERROR,
"An attempt was made to set the policy version of CMake to something "
"earlier than \"2.4\". "
"In CMake 2.4 and below backwards compatibility was handled with the "
"CMAKE_BACKWARDS_COMPATIBILITY variable. "
"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 "
"CMAKE_BACKWARDS_COMPATIBILITY variable. "
"One way to so this is to set the policy version to 2.4 exactly."
);
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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();
for (;i != this->Policies.end(); ++i)
{
if (i->second->IsPolicyNewerThan(majorVer,minorVer,patchVer))
{
if (!mf->SetPolicy(i->second->ID, cmPolicies::WARN))
{
return false;
}
}
else
{
if (!mf->SetPolicy(i->second->ID, cmPolicies::NEW))
{
return false;
}
}
}
return true;
}
// is this a valid status the listfile can set this policy to?
bool cmPolicies::IsValidPolicyStatus(cmPolicies::PolicyID id,
cmPolicies::PolicyStatus status)
{
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// if they are setting a feature to anything other than OLD or WARN and the
// feature is not known about then that is an error
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if (this->Policies.find(id) == this->Policies.end())
{
if (status == cmPolicies::WARN ||
status == cmPolicies::OLD)
{
return true;
}
cmOStringStream error;
error <<
"Error: an attempt was made to enable the new behavior for " <<
"a new feature that is in a later version of CMake than "
"what you are runing, please upgrade to a newer version "
"of CMake.";
cmSystemTools::Error(error.str().c_str());
return false;
}
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// now we know the feature is defined, so the only issue is if someone is
// setting it to WARN or OLD when the feature is REQUIRED_ALWAYS
if ((status == cmPolicies::WARN ||
status == cmPolicies::OLD) &&
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this->Policies[id]->Status == cmPolicies::REQUIRED_ALWAYS)
{
cmOStringStream error;
error <<
"Error: an attempt was made to enable the old behavior for " <<
"a feature that is no longer supported. The feature in " <<
"question is feature " <<
id <<
" which had new behavior introduced in CMake version " <<
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this->Policies[id]->GetVersionString() <<
" please either update your CMakeLists files to conform to " <<
"the new behavior " <<
"or use an older version of CMake that still supports " <<
"the old behavior. Run cmake --help-policies " <<
id << " for more information.";
cmSystemTools::Error(error.str().c_str());
return false;
}
return true;
}
// is this a valid status the listfile can set this policy to?
bool cmPolicies::IsValidUsedPolicyStatus(cmPolicies::PolicyID id,
cmPolicies::PolicyStatus status)
{
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// if they are setting a feature to anything other than OLD or WARN and the
// feature is not known about then that is an error
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if (this->Policies.find(id) == this->Policies.end())
{
if (status == cmPolicies::WARN ||
status == cmPolicies::OLD)
{
return true;
}
cmOStringStream error;
error <<
"Error: an attempt was made to enable the new behavior for " <<
"a new feature that is in a later version of CMake than "
"what you are runing, please upgrade to a newer version "
"of CMake.";
cmSystemTools::Error(error.str().c_str());
return false;
}
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// now we know the feature is defined, so the only issue is if someone is
// setting it to WARN or OLD when the feature is REQUIRED_ALWAYS
if ((status == cmPolicies::WARN ||
status == cmPolicies::OLD) &&
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(this->Policies[id]->Status == cmPolicies::REQUIRED_ALWAYS ||
this->Policies[id]->Status == cmPolicies::REQUIRED_IF_USED))
{
cmOStringStream error;
error <<
"Error: an attempt was made to enable the old behavior for " <<
"a feature that is no longer supported. The feature in " <<
"question is feature " <<
id <<
" which had new behavior introduced in CMake version " <<
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this->Policies[id]->GetVersionString() <<
" please either update your CMakeLists files to conform to " <<
"the new behavior " <<
"or use an older version of CMake that still supports " <<
"the old behavior. Run cmake --help-policies " <<
id << " for more information.";
cmSystemTools::Error(error.str().c_str());
return false;
}
return true;
}
bool cmPolicies::GetPolicyID(const char *id, cmPolicies::PolicyID &pid)
{
if (!id || strlen(id) < 1)
{
return false;
}
std::map<std::string,cmPolicies::PolicyID>::iterator pos =
this->PolicyStringMap.find(id);
if (pos == this->PolicyStringMap.end())
{
return false;
}
pid = pos->second;
return true;
}
std::string cmPolicies::GetPolicyIDString(cmPolicies::PolicyID pid)
{
std::map<cmPolicies::PolicyID,cmPolicy *>::iterator pos =
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this->Policies.find(pid);
if (pos == this->Policies.end())
{
return "";
}
return pos->second->IDString;
}
///! return a warning string for a given policy
std::string cmPolicies::GetPolicyWarning(cmPolicies::PolicyID id)
{
std::map<cmPolicies::PolicyID,cmPolicy *>::iterator pos =
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this->Policies.find(id);
if (pos == this->Policies.end())
{
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 =
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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 =
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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);
}
}