maint: update copyright

[gnulib.git] / m4 / inline.m4

diff --git a/m4/inline.m4 b/m4/inline.m4
index 18f8ebf..c49957f 100644 (file)
--- a/m4/inline.m4
+++ b/m4/inline.m4
@@ -1,5 +1,5 @@
-# inline.m4 serial 1
-dnl Copyright (C) 2006 Free Software Foundation, Inc.
+# inline.m4 serial 4
+dnl Copyright (C) 2006, 2009-2014 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.
@@ -7,13 +7,34 @@ 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 supported, i.e. if the compiler is likely to drop unused
-dnl 'static inline' functions.
+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])
-  if test $ac_cv_c_inline != no; then
-    AC_DEFINE([HAVE_INLINE], 1,
-      [Define to 1 if the compiler supports one of the keywords 'inline', '__inline__', '__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
 ])