> diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
> index 8d6f5df..bdcaf9d 100644
> --- a/Modules/Compiler/GNU.cmake
> +++ b/Modules/Compiler/GNU.cmake
> @@ -24,6 +24,15 @@ macro(__compiler_gnu lang)
> set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
> set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
>
> + # Older versions of gcc (< 4.5) contain a bug causing them to report a
> missing + # header file as a warning if depfiles are enabled, causing
> check_header_file + # tests to always succeed. Work around this by
> disabling dependency tracking + # in try_compile mode.
> + GET_PROPERTY(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE)
> + if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES)
> + set(CMAKE_DEPFILE_FLAGS_${lang} "-MMD -MF <DEPFILE>")
> + endif()
> +
> # Initial configuration flags.
> set(CMAKE_${lang}_FLAGS_INIT "")
> set(CMAKE_${lang}_FLAGS_DEBUG_INIT "-g")This may only affect Ninja, but it looks like a general bug. Shouldn't this be it's own commit then? Greetings, Eike
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