2
dnl Copyright (C) 2006 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.
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.
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
20
dnl GCC defines __NO_INLINE__ if not optimizing or if -fno-inline is
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.)
26
[AC_LANG_PROGRAM([[]],
27
[[#ifdef __NO_INLINE__
28
#error "inline is not effective"
30
[gl_cv_c_inline_effective=yes],
31
[gl_cv_c_inline_effective=no])
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.])