| 1 | # inline.m4 serial 4
|
|---|
| 2 | dnl Copyright (C) 2006, 2009-2012 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 | ])
|
|---|
