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autogen: Fix MOC_PREDEFS_CMD if CXX env var contains multiple values

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Since commit 429a4527 we inject the C++ standard argument into
MOC_PREDEFS_CMD.  That failed if the CXX environment variable was set to
a value like "ccache c++", because the argument was inserted between
"ccache" and "c++".

Fix this by taking CMAKE_CXX_COMPILER_ARG1 into account that contains
the compiler arguments in CXX.

Fixes: #27445
This commit is contained in:
Joerg Bornemann
2025-12-10 13:43:44 +01:00
parent a0b446eb2f
commit 207e8a15d4
1 changed files with 17 additions and 3 deletions
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20
Source/cmQtAutoGenInitializer.cxx
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@@ -2027,9 +2027,23 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
this->GenTarget->Makefile->GetSafeDefinition(CompileOptionFlag);
if (!CompileOptionValue.empty()) {
if (this->Moc.PredefsCmd.size() >= 3) {
this->Moc.PredefsCmd.insert(this->Moc.PredefsCmd.begin() + 1,
CompileOptionValue);
// Determine where to insert the compile option (e.g., -std=gnu++23).
// CMAKE_CXX_COMPILER_PREDEFINES_COMMAND is built as:
// [CMAKE_CXX_COMPILER, CMAKE_CXX_COMPILER_ARG1, predefs_flags...]
// We need to insert after all compiler elements, before predefs flags.
size_t compilerElements = 1; // CMAKE_CXX_COMPILER
cmValue compilerArg1 =
this->Makefile->GetDefinition("CMAKE_CXX_COMPILER_ARG1");
if (compilerArg1 && !compilerArg1->empty()) {
std::vector<std::string> arg1List;
cmSystemTools::ParseUnixCommandLine(compilerArg1->c_str(), arg1List);
compilerElements += arg1List.size();
}
if (this->Moc.PredefsCmd.size() > compilerElements) {
this->Moc.PredefsCmd.insert(
this->Moc.PredefsCmd.begin() + compilerElements, CompileOptionValue);
}
}
info.SetArray("MOC_PREDEFS_CMD", this->Moc.PredefsCmd);