[CMake] Compile all .c source files with the CXX compiler

[Alexandre Feblot]

Well, I indeed found this to work, but my project has about 20000 c files.

Alin, forcing CC to a C++ compiler is not an option either, as I also have a couple of libs which must be compiled with a C-ansi compiler.


I found that I could get the correct behaviour by modifying the value of CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS in the generated files <build_dir>/CMakeFiles/Cmake{CC,CXX}Compiler.cmake

BUT:
These files are read when calling 'project()'. They set the initial value for CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS, which then seem to be used once for all by cmake. Any later attempt to change them has no effect.

So, should these CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS variables be considerered as read-only?
Is this a bug?



-----Original Message-----
From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of Pau Garcia i Quiles
Sent: Tuesday, 31 March 2009 17:21
To: Alexandre Feblot
Cc: Cmake Mailing List
Subject: Re: [CMake] Compile all .c source files with the CXX compiler

Hello,

Try

SET_SOURCE_FILES_PROPERTIES( file1.c file2.c file3.c PROPERTIES LANGUAGE CXX )

On Tue, Mar 31, 2009 at 5:16 PM, Alexandre Feblot
<Alexandre.Feblot at thomsonreuters.com> wrote:
> Hi,
>
> In my project, all sources named .c are C++ files, and should be considered
> as CXX language files.
>
> I tried to set this with CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS, at the very
> beginning of my project, without success. How should I do it?
>
>
>
> cmake_minimum_required (VERSION 2.6)
>
> project(MY_PROJECT)
>
> # Can't changes the following values before calling project(), which reset
> them to default values.
>
> list(REMOVE_ITEM CMAKE_C_SOURCE_FILE_EXTENSIONS c)
> list(APPEND    CMAKE_CXX_SOURCE_FILE_EXTENSIONS c)
> #  value: CMAKE_C_SOURCE_FILE_EXTENSIONS:
> #  value: CMAKE_CXX_SOURCE_FILE_EXTENSIONS: C;M;c++;cc;cpp;cxx;m;mm;c
>
> But later on, my .c files are still considered as C files, as shown with:
>
>
>
> get_source_file_property(lang source_file.c LANGUAGE)
> #value: lang: C


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