Linking C and CXX files in CMake
- by vedro so snegom
Hi
I'm building C++ app with CMake. But it uses some source files in C. Here is simplified structure:
trunk/CMakeLists.txt:
project(myapp)
set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} -g -Wall")
add_subdirectory (src myapp)
trunk/src/main.cpp:
#include "smth/f.h"
int main() { f(); }
trunk/src/CMakeLists.txt:
add_subdirectory (smth)
link_directories (smth)
set(APP_SRC main)
add_executable (myapp ${APP_SRC})
target_link_libraries (myapp smth)
trunk/src/smth/f.h:
#ifndef F_H
#define F_H
void f();
#endif
trunk/src/smth/f.c:
#include "f.h"
void f() {}
trunk/src/smth/CMakeLists.txt
set (SMTH_SRC some_cpp_file1 some_cpp_file2 f)
add_library (smth STATIC ${SMTH_SRC})
The problem is: i run gmake, it compiles all the files and when it links all libs together, i get:
undefined reference to `f()` in main.cpp
if i rename f.c into f.cpp everything goes just fine. What's the difference and how to handle it?
Thanks
