[CMake] Assembly language support using gcc or gas
Alexander Neundorf
a.neundorf-work at gmx.net
Wed Aug 3 15:27:42 EDT 2011
Hi,
On Wednesday 03 August 2011, Glenn Coombs wrote:
> I tried changing from ASM to ASM-ATT and that fails like this:
>
> /usr/bin/as -I/user/grc/msvdx-cvsfiles/sim/msvdx-cmake-2.8.5/systemC/src
> -I/user/grc/msvdx-cvsfiles/sim/msvdx-cmake-2.8.5/systemC/src/sysc/kernel
> -DNOMINMAX -DUSE_SIM_NAMESPACE -o
> CMakeFiles/systemc.dir/src/sysc/qt/md/i386.s.o
> /user/grc/msvdx-cvsfiles/sim/msvdx-cmake-2.8.5/systemC/src/sysc/qt/md/i386.
> s /usr/bin/as: unrecognized option `-NOMINMAX'
>
> I really don't think the -I and -D options should be passed through for
> assembler files. They only make sense for C/C++ files. There should be a
> separate variable like CMAKE_ASM_FLAGS that is used instead of
> CMAKE_C_FLAGS or CMAKE_CXX_FLAGS. And maybe there needs to be a change to
> the
> add_definitions() command to allow an optional LANG argument ? Do
> assembers even support preprocessor definitions ?
>
> I was able to get it to work for both 2.8.4 and 2.8.5 with the following
> code:
>
> if(UNIX)
> list(APPEND sources "src/sysc/qt/qt.c")
>
> # see if we are building 32-bit or 64-bit executables
> file(WRITE ${CMAKE_BINARY_DIR}/check_32or64bit.cpp "int main(int argc,
> char *argv[]) { return 8 * sizeof(char *); }\n")
>
> try_run(
> run_result
> compile_result
> ${CMAKE_BINARY_DIR}
> ${CMAKE_BINARY_DIR}/check_32or64bit.cpp
> )
>
> if (${run_result} EQUAL 32)
> list(APPEND sources "src/sysc/qt/md/i386.s")
> if(APPLE)
> set(ASM_SYS_FLAGS "-arch i386")
> else()
> set(ASM_SYS_FLAGS "-32")
> endif()
> else()
> list(APPEND sources "src/sysc/qt/md/iX86_64.s")
> if(APPLE)
> set(ASM_SYS_FLAGS "-arch x86_64")
> else()
> set(ASM_SYS_FLAGS "-64")
> endif()
> endif()
>
> enable_language(ASM-ATT)
>
> set(CMAKE_ASM-ATT_COMPILE_OBJECT "<CMAKE_ASM-ATT_COMPILER>
> ${ASM_SYS_FLAGS} -o <OBJECT> <SOURCE>")
> endif()
>
> I'm not sure if this is the recommended way to do this though. I thought
> the documentation said to override CMAKE_ASM-ATT_COMPILE_OBJECT before the
> enable_language() command.
You should not have to override it.
To set flags, there are for every enabled language CMAKE_<LANGUAGE>_FLAGS in
the cmake cache, i.e. CMAKE_ASM-ATT_FLAGS in this case.
I tried to reproduce the problem with the attached tiny project, and I don't
get the problem you describe. This is the output:
as-test/b$ /opt/cmake-HEAD/bin/cmake ..
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- The ASM-ATT compiler identification is GNU
-- Found assembler: /usr/bin/as
-- Configuring done
-- Generating done
-- Build files have been written to: /home/alex/src/CMake/build dir/CMake-
git/Tests/Assembler/as-test/b
as-test/b$ make VERBOSE=1
...
Scanning dependencies of target hello
make[2]: Leaving directory `/home/alex/src/CMake/build dir/CMake-
git/Tests/Assembler/as-test/b'
make -f CMakeFiles/hello.dir/build.make CMakeFiles/hello.dir/build
make[2]: Entering directory `/home/alex/src/CMake/build dir/CMake-
git/Tests/Assembler/as-test/b'
/opt/cmake-HEAD/bin/cmake -E cmake_progress_report "/home/alex/src/CMake/build
dir/CMake-git/Tests/Assembler/as-test/b/CMakeFiles" 1
[ 50%] Building C object CMakeFiles/hello.dir/main.c.o
/usr/bin/gcc -DFOO -DBLUB=blub -DBAR=bar -I/opt/include -o
CMakeFiles/hello.dir/main.c.o -c "/home/alex/src/CMake/build dir/CMake-
git/Tests/Assembler/as-test/main.c"
/opt/cmake-HEAD/bin/cmake -E cmake_progress_report "/home/alex/src/CMake/build
dir/CMake-git/Tests/Assembler/as-test/b/CMakeFiles" 2
[100%] Building ASM-ATT object CMakeFiles/hello.dir/foo.s.o
/usr/bin/as -I/opt/include -o CMakeFiles/hello.dir/foo.s.o
"/home/alex/src/CMake/build dir/CMake-git/Tests/Assembler/as-test/foo.s"
Linking C executable hello
...
So, here main.c gets all the -D's, and foo.s gets the -I, but not the -D's.
Is that different for you ?
Alex
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