| # inline.m4 serial 3 |
| dnl Copyright (C) 2006 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl Test for the 'inline' keyword or equivalent. |
| dnl Define 'inline' to a supported equivalent, or to nothing if not supported, |
| dnl like AC_C_INLINE does. Also, define HAVE_INLINE if 'inline' or an |
| dnl equivalent is effectively supported, i.e. if the compiler is likely to |
| dnl drop unused 'static inline' functions. |
| AC_DEFUN([gl_INLINE], |
| [ |
| AC_REQUIRE([AC_C_INLINE]) |
| AC_CACHE_CHECK([whether the compiler generally respects inline], |
| [gl_cv_c_inline_effective], |
| [if test $ac_cv_c_inline = no; then |
| gl_cv_c_inline_effective=no |
| else |
| dnl GCC defines __NO_INLINE__ if not optimizing or if -fno-inline is |
| dnl specified. |
| dnl Use AC_COMPILE_IFELSE here, not AC_EGREP_CPP, because the result |
| dnl depends on optimization flags, which can be in CFLAGS. |
| dnl (AC_EGREP_CPP looks only at the CPPFLAGS.) |
| AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM([[]], |
| [[#ifdef __NO_INLINE__ |
| #error "inline is not effective" |
| #endif]])], |
| [gl_cv_c_inline_effective=yes], |
| [gl_cv_c_inline_effective=no]) |
| fi |
| ]) |
| if test $gl_cv_c_inline_effective = yes; then |
| AC_DEFINE([HAVE_INLINE], 1, |
| [Define to 1 if the compiler supports one of the keywords |
| 'inline', '__inline__', '__inline' and effectively inlines |
| functions marked as such.]) |
| fi |
| ]) |
