[CMake] nonstandard C++ source filename extension

[Dave Yost]

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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