CMakeTestInline

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This handy test is from Jack Kelly on the cmake email list.

Here is a minimal working example. It tests the inline keyword, then __inline__ and then __inline. When it finds one that works, it will ADD_DEFINITIONS(-Dinline=${KEYWORD}) and if none work, it will ADD_DEFINITIONS(-Dinline=).

# Inspired from /usr/share/autoconf/autoconf/c.m4
FOREACH(KEYWORD "inline" "__inline__" "__inline")
   IF(NOT DEFINED C_INLINE)
     TRY_COMPILE(C_HAS_${KEYWORD} "${GPUIT_BINARY_DIR}"
       "${GPUIT_SOURCE_DIR}/test_inline.c"
       COMPILE_DEFINITIONS "-Dinline=${KEYWORD}")
     IF(C_HAS_${KEYWORD})
       SET(C_INLINE TRUE)
       ADD_DEFINITIONS("-Dinline=${KEYWORD}")
     ENDIF(C_HAS_${KEYWORD})
   ENDIF(NOT DEFINED C_INLINE)
ENDFOREACH(KEYWORD)
IF(NOT DEFINED C_INLINE)
   ADD_DEFINITIONS("-Dinline=")
ENDIF(NOT DEFINED C_INLINE)

You also need this file in your source directory.

/* Test source lifted from /usr/share/autoconf/autoconf/c.m4 */
typedef int foo_t;
static inline foo_t static_foo(){return 0;}
foo_t foo(){return 0;}
int main(int argc, char *argv[]){return 0;}