1 # inline.m4 serial 4 2 dnl Copyright (C) 2006, 2009 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl Test for the 'inline' keyword or equivalent. 8 dnl Define 'inline' to a supported equivalent, or to nothing if not supported, 9 dnl like AC_C_INLINE does. Also, define HAVE_INLINE if 'inline' or an 10 dnl equivalent is effectively supported, i.e. if the compiler is likely to 11 dnl drop unused 'static inline' functions. 12 AC_DEFUN([gl_INLINE], 13 [ 14 AC_REQUIRE([AC_C_INLINE]) 15 AC_CACHE_CHECK([whether the compiler generally respects inline], 16 [gl_cv_c_inline_effective], 17 [if test $ac_cv_c_inline = no; then 18 gl_cv_c_inline_effective=no 19 else 20 dnl GCC defines __NO_INLINE__ if not optimizing or if -fno-inline is 21 dnl specified. 22 dnl Use AC_COMPILE_IFELSE here, not AC_EGREP_CPP, because the result 23 dnl depends on optimization flags, which can be in CFLAGS. 24 dnl (AC_EGREP_CPP looks only at the CPPFLAGS.) 25 AC_COMPILE_IFELSE( 26 [AC_LANG_PROGRAM([[]], 27 [[#ifdef __NO_INLINE__ 28 #error "inline is not effective" 29 #endif]])], 30 [gl_cv_c_inline_effective=yes], 31 [gl_cv_c_inline_effective=no]) 32 fi 33 ]) 34 if test $gl_cv_c_inline_effective = yes; then 35 AC_DEFINE([HAVE_INLINE], [1], 36 [Define to 1 if the compiler supports one of the keywords 37 'inline', '__inline__', '__inline' and effectively inlines 38 functions marked as such.]) 39 fi 40 ]) 41
