| 1 | # inline.m4 serial 4 |
| 2 | dnl Copyright (C) 2006, 2009-2013 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 | ]) |