CMake/Source/cmPolicies.cxx

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#include "cmPolicies.h"
#include "cmAlgorithms.h"
#include "cmMakefile.h"
#include "cmState.h"
#include "cmSystemTools.h"
#include "cmVersion.h"
#include "cmake.h"
#include <assert.h>
#include <cmConfigure.h>
#include <ctype.h>
#include <sstream>
#include <stdio.h>
#include <string.h>
#include <vector>
static bool stringToId(const char* input, cmPolicies::PolicyID& pid)
{
assert(input);
if (strlen(input) != 7) {
return false;
}
if (!cmHasLiteralPrefix(input, "CMP")) {
return false;
}
if (cmHasLiteralSuffix(input, "0000")) {
pid = cmPolicies::CMP0000;
return true;
}
for (int i = 3; i < 7; ++i) {
if (!isdigit(*(input + i))) {
return false;
}
}
long id;
if (!cmSystemTools::StringToLong(input + 3, &id)) {
return false;
}
if (id >= cmPolicies::CMPCOUNT) {
return false;
}
pid = cmPolicies::PolicyID(id);
return true;
}
#define CM_SELECT_ID_VERSION(F, A1, A2, A3, A4, A5, A6) F(A1, A3, A4, A5)
#define CM_FOR_EACH_POLICY_ID_VERSION(POLICY) \
CM_FOR_EACH_POLICY_TABLE(POLICY, CM_SELECT_ID_VERSION)
#define CM_SELECT_ID_DOC(F, A1, A2, A3, A4, A5, A6) F(A1, A2)
#define CM_FOR_EACH_POLICY_ID_DOC(POLICY) \
CM_FOR_EACH_POLICY_TABLE(POLICY, CM_SELECT_ID_DOC)
static const char* idToString(cmPolicies::PolicyID id)
{
switch (id) {
#define POLICY_CASE(ID) \
case cmPolicies::ID: \
return #ID;
CM_FOR_EACH_POLICY_ID(POLICY_CASE)
#undef POLICY_CASE
case cmPolicies::CMPCOUNT:
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return CM_NULLPTR;
}
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return CM_NULLPTR;
}
static const char* idToVersion(cmPolicies::PolicyID id)
{
switch (id) {
#define POLICY_CASE(ID, V_MAJOR, V_MINOR, V_PATCH) \
case cmPolicies::ID: \
return #V_MAJOR "." #V_MINOR "." #V_PATCH;
CM_FOR_EACH_POLICY_ID_VERSION(POLICY_CASE)
#undef POLICY_CASE
case cmPolicies::CMPCOUNT:
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return CM_NULLPTR;
}
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return CM_NULLPTR;
}
static bool isPolicyNewerThan(cmPolicies::PolicyID id, unsigned int majorV,
unsigned int minorV, unsigned int patchV)
{
switch (id) {
#define POLICY_CASE(ID, V_MAJOR, V_MINOR, V_PATCH) \
case cmPolicies::ID: \
return ( \
majorV < V_MAJOR || (majorV == V_MAJOR && minorV + 1 < V_MINOR + 1) || \
(majorV == V_MAJOR && minorV == V_MINOR && patchV + 1 < V_PATCH + 1));
CM_FOR_EACH_POLICY_ID_VERSION(POLICY_CASE)
#undef POLICY_CASE
case cmPolicies::CMPCOUNT:
return false;
}
return false;
}
const char* idToShortDescription(cmPolicies::PolicyID id)
{
switch (id) {
#define POLICY_CASE(ID, SHORT_DESCRIPTION) \
case cmPolicies::ID: \
return SHORT_DESCRIPTION;
CM_FOR_EACH_POLICY_ID_DOC(POLICY_CASE)
#undef POLICY_CASE
case cmPolicies::CMPCOUNT:
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return CM_NULLPTR;
}
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return CM_NULLPTR;
}
static void DiagnoseAncientPolicies(
std::vector<cmPolicies::PolicyID> const& ancient, unsigned int majorVer,
unsigned int minorVer, unsigned int patchVer, cmMakefile* mf)
{
std::ostringstream e;
e << "The project requests behavior compatible with CMake version \""
<< majorVer << "." << minorVer << "." << patchVer
<< "\", which requires the OLD behavior for some policies:\n";
for (std::vector<cmPolicies::PolicyID>::const_iterator i = ancient.begin();
i != ancient.end(); ++i) {
e << " " << idToString(*i) << ": " << idToShortDescription(*i) << "\n";
}
e << "However, this version of CMake no longer supports the OLD "
<< "behavior for these policies. "
<< "Please either update your CMakeLists.txt files to conform to "
<< "the new behavior or use an older version of CMake that still "
<< "supports the old behavior.";
mf->IssueMessage(cmake::FATAL_ERROR, e.str());
}
static bool GetPolicyDefault(cmMakefile* mf, std::string const& policy,
cmPolicies::PolicyStatus* defaultSetting)
{
std::string defaultVar = "CMAKE_POLICY_DEFAULT_" + policy;
std::string defaultValue = mf->GetSafeDefinition(defaultVar);
if (defaultValue == "NEW") {
*defaultSetting = cmPolicies::NEW;
} else if (defaultValue == "OLD") {
*defaultSetting = cmPolicies::OLD;
} else if (defaultValue == "") {
*defaultSetting = cmPolicies::WARN;
} else {
std::ostringstream e;
e << defaultVar << " has value \"" << defaultValue
<< "\" but must be \"OLD\", \"NEW\", or \"\" (empty).";
mf->IssueMessage(cmake::FATAL_ERROR, e.str());
return false;
}
return true;
}
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;
unsigned int tweakVer = 0;
// parse the string
if (sscanf(ver.c_str(), "%u.%u.%u.%u", &majorVer, &minorVer, &patchVer,
&tweakVer) < 2) {
std::ostringstream e;
e << "Invalid policy version value \"" << ver << "\". "
<< "A numeric major.minor[.patch[.tweak]] must be given.";
mf->IssueMessage(cmake::FATAL_ERROR, e.str());
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)) {
mf->IssueMessage(
cmake::FATAL_ERROR,
"Compatibility with CMake < 2.4 is not supported by CMake >= 3.0. "
"For compatibility with older versions please use any CMake 2.8.x "
"release or lower.");
return false;
}
// It is an error if the policy version is greater than the running
// CMake.
if (majorVer > cmVersion::GetMajorVersion() ||
(majorVer == cmVersion::GetMajorVersion() &&
minorVer > cmVersion::GetMinorVersion()) ||
(majorVer == cmVersion::GetMajorVersion() &&
minorVer == cmVersion::GetMinorVersion() &&
patchVer > cmVersion::GetPatchVersion()) ||
(majorVer == cmVersion::GetMajorVersion() &&
minorVer == cmVersion::GetMinorVersion() &&
patchVer == cmVersion::GetPatchVersion() &&
tweakVer > cmVersion::GetTweakVersion())) {
std::ostringstream e;
e << "An attempt was made to set the policy version of CMake to \""
<< version << "\" which is greater than this version of CMake. "
<< "This is not allowed because the greater version may have new "
<< "policies not known to this CMake. "
<< "You may need a newer CMake version to build this project.";
mf->IssueMessage(cmake::FATAL_ERROR, e.str());
return false;
}
// now loop over all the policies and set them as appropriate
std::vector<cmPolicies::PolicyID> ancientPolicies;
for (PolicyID pid = cmPolicies::CMP0000; pid != cmPolicies::CMPCOUNT;
pid = PolicyID(pid + 1)) {
if (isPolicyNewerThan(pid, majorVer, minorVer, patchVer)) {
if (cmPolicies::GetPolicyStatus(pid) == cmPolicies::REQUIRED_ALWAYS) {
ancientPolicies.push_back(pid);
} else {
cmPolicies::PolicyStatus status = cmPolicies::WARN;
if (!GetPolicyDefault(mf, idToString(pid), &status) ||
!mf->SetPolicy(pid, status)) {
return false;
}
if (pid == cmPolicies::CMP0001 &&
(status == cmPolicies::WARN || status == cmPolicies::OLD)) {
if (!(mf->GetState()->GetInitializedCacheValue(
"CMAKE_BACKWARDS_COMPATIBILITY"))) {
// Set it to 2.4 because that is the last version where the
// variable had meaning.
mf->AddCacheDefinition(
"CMAKE_BACKWARDS_COMPATIBILITY", "2.4",
"For backwards compatibility, what version of CMake "
"commands and "
"syntax should this version of CMake try to support.",
cmState::STRING);
}
}
}
} else {
if (!mf->SetPolicy(pid, cmPolicies::NEW)) {
return false;
}
}
}
// Make sure the project does not use any ancient policies.
if (!ancientPolicies.empty()) {
DiagnoseAncientPolicies(ancientPolicies, majorVer, minorVer, patchVer, mf);
cmSystemTools::SetFatalErrorOccured();
return false;
}
return true;
}
bool cmPolicies::GetPolicyID(const char* id, cmPolicies::PolicyID& pid)
{
return stringToId(id, pid);
}
///! return a warning string for a given policy
std::string cmPolicies::GetPolicyWarning(cmPolicies::PolicyID id)
{
std::ostringstream msg;
msg << "Policy " << idToString(id) << " is not set: "
""
<< idToShortDescription(id) << " "
"Run \"cmake --help-policy "
<< idToString(id) << "\" for "
"policy details. "
"Use the cmake_policy command to set the policy "
"and suppress this warning.";
return msg.str();
}
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///! return an error string for when a required policy is unspecified
std::string cmPolicies::GetRequiredPolicyError(cmPolicies::PolicyID id)
{
std::ostringstream error;
error << "Policy " << idToString(id) << " is not set to NEW: "
""
<< idToShortDescription(id) << " "
"Run \"cmake --help-policy "
<< idToString(id)
<< "\" 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 "
<< idToString(id) << " NEW)\n"
"or by upgrading all policies with the code\n"
" cmake_policy(VERSION "
<< idToVersion(id)
<< ") # 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 /*unused*/)
{
return cmPolicies::WARN;
}
std::string cmPolicies::GetRequiredAlwaysPolicyError(cmPolicies::PolicyID id)
{
std::string pid = idToString(id);
std::ostringstream e;
e << "Policy " << pid << " may not be set to OLD behavior because this "
<< "version of CMake no longer supports it. "
<< "The policy was introduced in "
<< "CMake version " << idToVersion(id)
<< ", and use of NEW behavior is now required."
<< "\n"
<< "Please either update your CMakeLists.txt files to conform to "
<< "the new behavior or use an older version of CMake that still "
<< "supports the old behavior. "
<< "Run cmake --help-policy " << pid << " for more information.";
return e.str();
}
cmPolicies::PolicyStatus cmPolicies::PolicyMap::Get(
cmPolicies::PolicyID id) const
{
PolicyStatus status = cmPolicies::WARN;
if (this->Status[(POLICY_STATUS_COUNT * id) + OLD]) {
status = cmPolicies::OLD;
} else if (this->Status[(POLICY_STATUS_COUNT * id) + NEW]) {
status = cmPolicies::NEW;
}
return status;
}
void cmPolicies::PolicyMap::Set(cmPolicies::PolicyID id,
cmPolicies::PolicyStatus status)
{
this->Status[(POLICY_STATUS_COUNT * id) + OLD] = (status == OLD);
this->Status[(POLICY_STATUS_COUNT * id) + WARN] = (status == WARN);
this->Status[(POLICY_STATUS_COUNT * id) + NEW] = (status == NEW);
}
bool cmPolicies::PolicyMap::IsDefined(cmPolicies::PolicyID id) const
{
return this->Status[(POLICY_STATUS_COUNT * id) + OLD] ||
this->Status[(POLICY_STATUS_COUNT * id) + WARN] ||
this->Status[(POLICY_STATUS_COUNT * id) + NEW];
}
bool cmPolicies::PolicyMap::IsEmpty() const
{
return this->Status.none();
}