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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 "cmCMakePolicyCommand.h"
#include "cmExecutionStatus.h"
#include "cmMakefile.h"
#include "cmMessageType.h"
#include "cmPolicies.h"
#include "cmState.h"
#include "cmStateTypes.h"
#include "cmStringAlgorithms.h"
#include "cmValue.h"
namespace {
bool HandleSetMode(std::vector<std::string> const& args,
cmExecutionStatus& status);
bool HandleGetMode(std::vector<std::string> const& args,
cmExecutionStatus& status);
bool HandleVersionMode(std::vector<std::string> const& args,
cmExecutionStatus& status);
bool HandleGetWarningMode(std::vector<std::string> const& args,
cmExecutionStatus& status);
}
// cmCMakePolicyCommand
bool cmCMakePolicyCommand(std::vector<std::string> const& args,
cmExecutionStatus& status)
{
if (args.empty()) {
status.SetError("requires at least one argument.");
return false;
}
if (args[0] == "SET") {
return HandleSetMode(args, status);
}
if (args[0] == "GET") {
return HandleGetMode(args, status);
}
if (args[0] == "PUSH") {
if (args.size() > 1) {
status.SetError("PUSH may not be given additional arguments.");
return false;
}
status.GetMakefile().PushPolicy();
return true;
}
if (args[0] == "POP") {
if (args.size() > 1) {
status.SetError("POP may not be given additional arguments.");
return false;
}
status.GetMakefile().PopPolicy();
return true;
}
if (args[0] == "VERSION") {
return HandleVersionMode(args, status);
}
if (args[0] == "GET_WARNING") {
return HandleGetWarningMode(args, status);
}
status.SetError(cmStrCat("given unknown first argument \"", args[0], "\""));
return false;
}
namespace {
bool HandleSetMode(std::vector<std::string> const& args,
cmExecutionStatus& status)
{
if (args.size() != 3) {
status.SetError("SET must be given exactly 2 additional arguments.");
return false;
}
cmPolicies::PolicyStatus policyStatus;
if (args[2] == "OLD") {
policyStatus = cmPolicies::OLD;
} else if (args[2] == "NEW") {
policyStatus = cmPolicies::NEW;
} else {
status.SetError(
cmStrCat("SET given unrecognized policy status \"", args[2], "\""));
return false;
}
if (!status.GetMakefile().SetPolicy(args[1].c_str(), policyStatus)) {
status.SetError("SET failed to set policy.");
return false;
}
if (args[1] == "CMP0001" &&
(policyStatus == cmPolicies::WARN || policyStatus == cmPolicies::OLD)) {
if (!(status.GetMakefile().GetState()->GetInitializedCacheValue(
"CMAKE_BACKWARDS_COMPATIBILITY"))) {
// Set it to 2.4 because that is the last version where the
// variable had meaning.
status.GetMakefile().AddCacheDefinition(
"CMAKE_BACKWARDS_COMPATIBILITY", "2.4",
"For backwards compatibility, what version of CMake "
"commands and "
"syntax should this version of CMake try to support.",
cmStateEnums::STRING);
}
}
return true;
}
bool HandleGetMode(std::vector<std::string> const& args,
cmExecutionStatus& status)
{
bool parent_scope = false;
if (args.size() == 4 && args[3] == "PARENT_SCOPE") {
// Undocumented PARENT_SCOPE option for use within CMake.
parent_scope = true;
} else if (args.size() != 3) {
status.SetError("GET must be given exactly 2 additional arguments.");
return false;
}
// Get arguments.
std::string const& id = args[1];
std::string const& var = args[2];
// Lookup the policy number.
cmPolicies::PolicyID pid;
if (!cmPolicies::GetPolicyID(id.c_str(), pid)) {
status.SetError(
cmStrCat("GET given policy \"", id,
"\" which is not known to this version of CMake."));
return false;
}
// Lookup the policy setting.
cmPolicies::PolicyStatus policyStatus =
status.GetMakefile().GetPolicyStatus(pid, parent_scope);
switch (policyStatus) {
case cmPolicies::OLD:
// Report that the policy is set to OLD.
status.GetMakefile().AddDefinition(var, "OLD");
break;
case cmPolicies::WARN:
// Report that the policy is not set.
status.GetMakefile().AddDefinition(var, "");
break;
case cmPolicies::NEW:
// Report that the policy is set to NEW.
status.GetMakefile().AddDefinition(var, "NEW");
break;
case cmPolicies::REQUIRED_IF_USED:
case cmPolicies::REQUIRED_ALWAYS:
// The policy is required to be set before anything needs it.
{
status.GetMakefile().IssueMessage(
MessageType::FATAL_ERROR,
cmStrCat(
cmPolicies::GetRequiredPolicyError(pid), "\n",
"The call to cmake_policy(GET ", id,
" ...) at which this "
"error appears requests the policy, and this version of CMake ",
"requires that the policy be set to NEW before it is checked."));
}
}
return true;
}
bool HandleVersionMode(std::vector<std::string> const& args,
cmExecutionStatus& status)
{
if (args.size() <= 1) {
status.SetError("VERSION not given an argument");
return false;
}
if (args.size() >= 3) {
status.SetError("VERSION given too many arguments");
return false;
}
std::string const& version_string = args[1];
// Separate the <min> version and any trailing ...<max> component.
std::string::size_type const dd = version_string.find("...");
std::string const version_min = version_string.substr(0, dd);
std::string const version_max = dd != std::string::npos
? version_string.substr(dd + 3, std::string::npos)
: std::string();
if (dd != std::string::npos &&
(version_min.empty() || version_max.empty())) {
status.SetError(
cmStrCat("VERSION \"", version_string,
R"(" does not have a version on both sides of "...".)"));
return false;
}
return status.GetMakefile().SetPolicyVersion(version_min, version_max);
}
bool HandleGetWarningMode(std::vector<std::string> const& args,
cmExecutionStatus& status)
{
if (args.size() != 3) {
status.SetError(
"GET_WARNING must be given exactly 2 additional arguments.");
return false;
}
// Get arguments.
std::string const& id = args[1];
std::string const& var = args[2];
// Lookup the policy number.
cmPolicies::PolicyID pid;
if (!cmPolicies::GetPolicyID(id.c_str(), pid)) {
status.SetError(
cmStrCat("GET_WARNING given policy \"", id,
"\" which is not known to this version of CMake."));
return false;
}
// Lookup the policy warning.
status.GetMakefile().AddDefinition(var, cmPolicies::GetPolicyWarning(pid));
return true;
}
}
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