CMake/Source/cmSetCommand.cxx

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
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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. */
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#include "cmSetCommand.h"
// cmSetCommand
bool cmSetCommand::InitialPass(std::vector<std::string> const& args,
cmExecutionStatus&)
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{
if (args.empty()) {
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this->SetError("called with incorrect number of arguments");
return false;
}
// watch for ENV signatures
const char* variable = args[0].c_str(); // VAR is always first
if (cmHasLiteralPrefix(variable, "ENV{") && strlen(variable) > 5) {
// what is the variable name
char* varName = new char[strlen(variable)];
strncpy(varName, variable + 4, strlen(variable) - 5);
varName[strlen(variable) - 5] = '\0';
std::string putEnvArg = varName;
putEnvArg += "=";
// what is the current value if any
std::string currValue;
const bool currValueSet = cmSystemTools::GetEnv(varName, currValue);
delete[] varName;
// will it be set to something, then set it
if (args.size() > 1 && !args[1].empty()) {
// but only if it is different from current value
if (!currValueSet || currValue != args[1]) {
putEnvArg += args[1];
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cmSystemTools::PutEnv(putEnvArg);
}
return true;
}
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// if it will be cleared, then clear it if it isn't already clear
if (currValueSet) {
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cmSystemTools::PutEnv(putEnvArg);
}
return true;
}
// SET (VAR) // Removes the definition of VAR.
if (args.size() == 1) {
this->Makefile->RemoveDefinition(variable);
return true;
}
// SET (VAR PARENT_SCOPE) // Removes the definition of VAR
// in the parent scope.
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if (args.size() == 2 && args[args.size() - 1] == "PARENT_SCOPE") {
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this->Makefile->RaiseScope(variable, CM_NULLPTR);
return true;
}
// here are the remaining options
// SET (VAR value )
// SET (VAR value PARENT_SCOPE)
// SET (VAR CACHE TYPE "doc String" [FORCE])
// SET (VAR value CACHE TYPE "doc string" [FORCE])
std::string value; // optional
bool cache = false; // optional
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bool force = false; // optional
bool parentScope = false;
cmState::CacheEntryType type = cmState::STRING; // required if cache
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const char* docstring = CM_NULLPTR; // required if cache
unsigned int ignoreLastArgs = 0;
// look for PARENT_SCOPE argument
if (args.size() > 1 && args[args.size() - 1] == "PARENT_SCOPE") {
parentScope = true;
ignoreLastArgs++;
} else {
// look for FORCE argument
if (args.size() > 4 && args[args.size() - 1] == "FORCE") {
force = true;
ignoreLastArgs++;
}
// check for cache signature
if (args.size() > 3 &&
args[args.size() - 3 - (force ? 1 : 0)] == "CACHE") {
cache = true;
ignoreLastArgs += 3;
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}
}
// collect any values into a single semi-colon separated value list
value = cmJoin(cmMakeRange(args).advance(1).retreat(ignoreLastArgs), ";");
if (parentScope) {
this->Makefile->RaiseScope(variable, value.c_str());
return true;
}
// we should be nice and try to catch some simple screwups if the last or
// next to last args are CACHE then they screwed up. If they used FORCE
// without CACHE they screwed up
if ((args[args.size() - 1] == "CACHE") ||
(args.size() > 1 && args[args.size() - 2] == "CACHE") ||
(force && !cache)) {
this->SetError("given invalid arguments for CACHE mode.");
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return false;
}
if (cache) {
std::string::size_type cacheStart = args.size() - 3 - (force ? 1 : 0);
type = cmState::StringToCacheEntryType(args[cacheStart + 1].c_str());
docstring = args[cacheStart + 2].c_str();
}
// see if this is already in the cache
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cmState* state = this->Makefile->GetState();
const char* existingValue = state->GetCacheEntryValue(variable);
if (existingValue &&
(state->GetCacheEntryType(variable) != cmState::UNINITIALIZED)) {
// if the set is trying to CACHE the value but the value
// is already in the cache and the type is not internal
// then leave now without setting any definitions in the cache
// or the makefile
if (cache && type != cmState::INTERNAL && !force) {
return true;
}
}
// if it is meant to be in the cache then define it in the cache
if (cache) {
this->Makefile->AddCacheDefinition(variable, value.c_str(), docstring,
type, force);
} else {
// add the definition
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this->Makefile->AddDefinition(variable, value.c_str());
}
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return true;
}