Getting base name of the source file at compile time

Question

I\'m using GCC; __FILE__ returns the current source file\'s entire path and name: /path/to/file.cpp. Is there a way to get just the file\'s name file.cpp<

Answer 1

It is easy with cmake.

DefineRelativeFilePaths.cmake

function (cmake_define_relative_file_paths SOURCES)
  foreach (SOURCE IN LISTS SOURCES)
    file (
      RELATIVE_PATH RELATIVE_SOURCE_PATH
      ${PROJECT_SOURCE_DIR} ${SOURCE}
    )

    set_source_files_properties (
      ${SOURCE} PROPERTIES
      COMPILE_DEFINITIONS __RELATIVE_FILE_PATH__="${RELATIVE_SOURCE_PATH}"
    )
  endforeach ()
endfunction ()

Somewhere in CMakeLists.txt

set (SOURCES ${SOURCES}
  "${CMAKE_CURRENT_SOURCE_DIR}/common.c"
  "${CMAKE_CURRENT_SOURCE_DIR}/main.c"
)

include (DefineRelativeFilePaths)
cmake_define_relative_file_paths ("${SOURCES}")

cmake .. && make clean && make VERBOSE=1

cc ... -D__RELATIVE_FILE_PATH__="src/main.c" ... -c src/main.c

That's it. Now you can make pretty log messages.

#define ..._LOG_HEADER(target) \
  fprintf(target, "%s %s:%u - ", __func__, __RELATIVE_FILE_PATH__, __LINE__);

func src/main.c:22 - my error

PS It is better to declear in config.h.in -> config.h

#ifndef __RELATIVE_FILE_PATH__
#define __RELATIVE_FILE_PATH__ __FILE__
#endif

So your linter wan't provide rain of errors.