try_compile: Honor CMAKE_<LANG>_FLAGS_<CONFIG> changes (#16054)
In the `try_compile` source file signature we propagate the caller's value of `CMAKE_<LANG>_FLAGS` into the test project. Extend this to propagate `CMAKE_<LANG>_FLAGS_<CONFIG>` too instead of always using the default value in the test project. This will be useful, for example, to allow the MSVC runtime library to be changed (e.g. `-MDd` => `-MTd`).
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@ -0,0 +1,7 @@
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try_compile-config-flags
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------------------------
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* The :command:`try_compile` command source file signature now honors
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configuration-specific flags (e.g. :variable:`CMAKE_<LANG>_FLAGS_DEBUG`)
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in the generated test project. Previously only the default such flags
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for the current toolchain were used.
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@ -353,6 +353,13 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv,
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cmOutputConverter::EscapeForCMake(flags?flags:"").c_str());
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fprintf(fout, "set(CMAKE_%s_FLAGS \"${CMAKE_%s_FLAGS}"
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" ${COMPILE_DEFINITIONS}\")\n", li->c_str(), li->c_str());
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static std::string const cfgDefault = "DEBUG";
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std::string const cfg = !tcConfig.empty()?
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cmSystemTools::UpperCase(tcConfig) : cfgDefault;
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std::string const langFlagsCfg = "CMAKE_" + *li + "_FLAGS_" + cfg;
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const char* flagsCfg = this->Makefile->GetDefinition(langFlagsCfg);
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fprintf(fout, "set(%s %s)\n", langFlagsCfg.c_str(),
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cmOutputConverter::EscapeForCMake(flagsCfg?flagsCfg:"").c_str());
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}
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switch(this->Makefile->GetPolicyStatus(cmPolicies::CMP0056))
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{
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@ -0,0 +1,17 @@
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enable_language(C)
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set(CMAKE_C_FLAGS_RELEASE "-DPP_ERROR ${CMAKE_C_FLAGS_DEBUG}")
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#-----------------------------------------------------------------------------
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set(CMAKE_TRY_COMPILE_CONFIGURATION Release)
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try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/src.c
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OUTPUT_VARIABLE out
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)
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string(REPLACE "\n" "\n " out " ${out}")
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if(RESULT)
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message(FATAL_ERROR "try_compile passed but should have failed:\n${out}")
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elseif(NOT "x${out}" MATCHES "PP_ERROR is defined")
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message(FATAL_ERROR "try_compile did not fail with PP_ERROR:\n${out}")
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else()
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message(STATUS "try_compile with per-config flag worked as expected")
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endif()
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@ -21,6 +21,7 @@ run_cmake(TargetTypeInvalid)
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run_cmake(TargetTypeStatic)
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run_cmake(CMP0056)
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run_cmake(CompileFlags)
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if(RunCMake_GENERATOR MATCHES "Make|Ninja")
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# Use a single build tree for a few tests without cleaning.
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@ -1 +1,4 @@
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int main(void) { return 0; }
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#ifdef PP_ERROR
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# error PP_ERROR is defined
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#endif
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