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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmCMakeMinimumRequired.h"
#include "cmVersion.h"
// cmCMakeMinimumRequired
bool cmCMakeMinimumRequired::InitialPass(std::vector<std::string> const& args,
cmExecutionStatus&)
{
// Process arguments.
std::string version_string;
bool doing_version = false;
for (unsigned int i = 0; i < args.size(); ++i) {
if (args[i] == "VERSION") {
doing_version = true;
} else if (args[i] == "FATAL_ERROR") {
if (doing_version) {
this->SetError("called with no value for VERSION.");
return false;
}
doing_version = false;
} else if (doing_version) {
doing_version = false;
version_string = args[i];
} else {
this->UnknownArguments.push_back(args[i]);
}
}
if (doing_version) {
this->SetError("called with no value for VERSION.");
return false;
}
// Make sure there was a version to check.
if (version_string.empty()) {
return this->EnforceUnknownArguments();
}
// Save the required version string.
this->Makefile->AddDefinition("CMAKE_MINIMUM_REQUIRED_VERSION",
version_string.c_str());
// Get the current version number.
unsigned int current_major = cmVersion::GetMajorVersion();
unsigned int current_minor = cmVersion::GetMinorVersion();
unsigned int current_patch = cmVersion::GetPatchVersion();
unsigned int current_tweak = cmVersion::GetTweakVersion();
// Parse at least two components of the version number.
// Use zero for those not specified.
unsigned int required_major = 0;
unsigned int required_minor = 0;
unsigned int required_patch = 0;
unsigned int required_tweak = 0;
if (sscanf(version_string.c_str(), "%u.%u.%u.%u", &required_major,
&required_minor, &required_patch, &required_tweak) < 2) {
std::ostringstream e;
e << "could not parse VERSION \"" << version_string << "\".";
this->SetError(e.str());
return false;
}
// Compare the version numbers.
if ((current_major < required_major) ||
(current_major == required_major && current_minor < required_minor) ||
(current_major == required_major && current_minor == required_minor &&
current_patch < required_patch) ||
(current_major == required_major && current_minor == required_minor &&
current_patch == required_patch && current_tweak < required_tweak)) {
// The current version is too low.
std::ostringstream e;
e << "CMake " << version_string
<< " or higher is required. You are running version "
<< cmVersion::GetCMakeVersion();
this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
cmSystemTools::SetFatalErrorOccured();
return true;
}
// The version is not from the future, so enforce unknown arguments.
if (!this->EnforceUnknownArguments()) {
return false;
}
if (required_major < 2 || (required_major == 2 && required_minor < 4)) {
this->Makefile->IssueMessage(
cmake::AUTHOR_WARNING,
"Compatibility with CMake < 2.4 is not supported by CMake >= 3.0.");
this->Makefile->SetPolicyVersion("2.4");
} else {
this->Makefile->SetPolicyVersion(version_string.c_str());
}
return true;
}
bool cmCMakeMinimumRequired::EnforceUnknownArguments()
{
if (!this->UnknownArguments.empty()) {
std::ostringstream e;
e << "called with unknown argument \"" << this->UnknownArguments[0]
<< "\".";
this->SetError(e.str());
return false;
}
return true;
}
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