[CMake] nonstandard C++ source filename extension

Adam adam707blue at gmail.com
Tue Mar 17 16:11:10 EDT 2015 

Hi Dave,

try
   add_definitions("-x c++")

CMakeLists.txt
cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
project(asm CXX)
add_definitions("-x c++")
set_source_files_properties(foo.bar PROPERTIES LANGUAGE CXX)
add_executable(foo foo.bar)
set_target_properties(foo PROPERTIES LINKER_LANGUAGE CXX)

Adam


On Tue, Mar 17, 2015 at 2:10 PM, Dave Yost <Dave at yost.com> wrote:

> From what I can glean online, I’ve tried this:
>
> set_source_files_properties(foo.bar  PROPERTIES  LANGUAGE  CXX)
> add_executable(foo  foo.bar)
> set_target_properties(foo  PROPERTIES  LINKER_LANGUAGE  CXX)
>
>
> but it doesn’t work.
> What am I missing?
>
> 0 Mon 20:16:15 yost
> 1181 Z% cat CMakeLists.txt
> cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
> project(asm CXX)
>
> set_source_files_properties(foo.bar PROPERTIES LANGUAGE CXX)
> add_executable(foo foo.bar)
> set_target_properties(foo PROPERTIES LINKER_LANGUAGE CXX)
> 0 Mon 20:16:43 yost
> 1182 Z% cat foo.bar
> #include <iostream>
>
> int main(int argc, char* argv[]) {
>   std::cout << "Hello\"\n";
>   return 0;
> }
> 0 Mon 20:16:46 yost
> 1183 Z% cd build ; cmake ..
> -- The CXX compiler identification is GNU 4.9.2
> -- Checking whether CXX compiler has -isysroot
> -- Checking whether CXX compiler has -isysroot - yes
> -- Checking whether CXX compiler supports OSX deployment target flag
> -- Checking whether CXX compiler supports OSX deployment target flag - yes
> -- Check for working CXX compiler: /opt/local/bin/c++
> -- Check for working CXX compiler: /opt/local/bin/c++ -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Detecting CXX compile features
> -- Detecting CXX compile features - done
> -- Configuring done
> -- Generating done
> -- Build files have been written to: /Users/yost/p/c++/cmake/asm/build
> 0 Mon 20:16:58 yost
> 1184 Z% make
> Scanning dependencies of target foo
> [100%] Building CXX object CMakeFiles/foo.dir/foo.bar.o
> c++: warning: /Users/yost/p/c++/cmake/asm/foo.bar: linker input file
> unused because linking not done
> Linking CXX executable foo
> c++: error: CMakeFiles/foo.dir/foo.bar.o: No such file or directory
> CMakeFiles/foo.dir/build.make:85: recipe for target 'foo' failed
> make[2]: *** [foo] Error 1
> CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/foo.dir/all' failed
> make[1]: *** [CMakeFiles/foo.dir/all] Error 2
> Makefile:75: recipe for target 'all' failed
> make: *** [all] Error 2
> 2 Mon 20:17:01 yost
> 1185 Z% rm -rf * ; cmake ..
> zsh: sure you want to delete all the files in
> /Users/yost/p/c++/cmake/asm/build [yn]? y
> -- The CXX compiler identification is GNU 4.9.2
> -- Checking whether CXX compiler has -isysroot
> -- Checking whether CXX compiler has -isysroot - yes
> -- Checking whether CXX compiler supports OSX deployment target flag
> -- Checking whether CXX compiler supports OSX deployment target flag - yes
> -- Check for working CXX compiler: /opt/local/bin/c++
> -- Check for working CXX compiler: /opt/local/bin/c++ -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Detecting CXX compile features
> -- Detecting CXX compile features - done
> -- Configuring done
> -- Generating done
> -- Build files have been written to: /Users/yost/p/c++/cmake/asm/build
> 0 Mon 20:23:00 yost
> 1201 Z% make VERBOSE=1
> /Applications/CMake.app/Contents/bin/cmake -H/Users/yost/p/c++/cmake/asm
> -B/Users/yost/p/c++/cmake/asm/build --check-build-system
> CMakeFiles/Makefile.cmake 0
> /Applications/CMake.app/Contents/bin/cmake -E cmake_progress_start
> /Users/yost/p/c++/cmake/asm/build/CMakeFiles
> /Users/yost/p/c++/cmake/asm/build/CMakeFiles/progress.marks
> make -f CMakeFiles/Makefile2 all
> make[1]: Entering directory '/Users/yost/p/c++/cmake/asm/build'
> make -f CMakeFiles/foo.dir/build.make CMakeFiles/foo.dir/depend
> make[2]: Entering directory '/Users/yost/p/c++/cmake/asm/build'
> cd /Users/yost/p/c++/cmake/asm/build &&
> /Applications/CMake.app/Contents/bin/cmake -E cmake_depends "Unix
> Makefiles" /Users/yost/p/c++/cmake/asm /Users/yost/p/c++/cmake/asm
> /Users/yost/p/c++/cmake/asm/build /Users/yost/p/c++/cmake/asm/build
> /Users/yost/p/c++/cmake/asm/build/CMakeFiles/foo.dir/DependInfo.cmake
> --color=
> Dependee
> "/Users/yost/p/c++/cmake/asm/build/CMakeFiles/foo.dir/DependInfo.cmake" is
> newer than depender
> "/Users/yost/p/c++/cmake/asm/build/CMakeFiles/foo.dir/depend.internal".
> Dependee
> "/Users/yost/p/c++/cmake/asm/build/CMakeFiles/CMakeDirectoryInformation.cmake"
> is newer than depender
> "/Users/yost/p/c++/cmake/asm/build/CMakeFiles/foo.dir/depend.internal".
> Scanning dependencies of target foo
> make[2]: Leaving directory '/Users/yost/p/c++/cmake/asm/build'
> make -f CMakeFiles/foo.dir/build.make CMakeFiles/foo.dir/build
> make[2]: Entering directory '/Users/yost/p/c++/cmake/asm/build'
> /Applications/CMake.app/Contents/bin/cmake -E cmake_progress_report
> /Users/yost/p/c++/cmake/asm/build/CMakeFiles 1
> [100%] Building CXX object CMakeFiles/foo.dir/foo.bar.o
> /opt/local/bin/c++     -o CMakeFiles/foo.dir/foo.bar.o -c
> /Users/yost/p/c++/cmake/asm/foo.bar
> c++: warning: /Users/yost/p/c++/cmake/asm/foo.bar: linker input file
> unused because linking not done
> Linking CXX executable foo
> /Applications/CMake.app/Contents/bin/cmake -E cmake_link_script
> CMakeFiles/foo.dir/link.txt --verbose=1
> /opt/local/bin/c++    -Wl,-search_paths_first
> -Wl,-headerpad_max_install_names  CMakeFiles/foo.dir/foo.bar.o  -o foo
> c++: error: CMakeFiles/foo.dir/foo.bar.o: No such file or directory
> CMakeFiles/foo.dir/build.make:85: recipe for target 'foo' failed
> make[2]: *** [foo] Error 1
> make[2]: Leaving directory '/Users/yost/p/c++/cmake/asm/build'
> CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/foo.dir/all' failed
> make[1]: *** [CMakeFiles/foo.dir/all] Error 2
> make[1]: Leaving directory '/Users/yost/p/c++/cmake/asm/build'
> Makefile:75: recipe for target 'all' failed
> make: *** [all] Error 2
> 2 Mon 20:23:04 yost
> 1202 Z%
>
> (I added the light blue and orange coloring by hand for readability.)
>
>
> --
>
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