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-rw-r--r--gl/m4/gnulib-common.m448
1 files changed, 25 insertions, 23 deletions
diff --git a/gl/m4/gnulib-common.m4 b/gl/m4/gnulib-common.m4
index 35f6195204..31e5f9499e 100644
--- a/gl/m4/gnulib-common.m4
+++ b/gl/m4/gnulib-common.m4
@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 35
+# gnulib-common.m4 serial 36
dnl Copyright (C) 2007-2014 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -319,26 +319,28 @@ m4_ifdef([AC_PROG_MKDIR_P], [
])
# AC_C_RESTRICT
-# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
-# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
-# works.
-# This definition can be removed once autoconf >= 2.62 can be assumed.
-# AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness.
-m4_ifndef([AC_AUTOCONF_VERSION],[
+# This definition is copied from post-2.69 Autoconf and overrides the
+# AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
+# once autoconf >= 2.70 can be assumed. It's painful to check version
+# numbers, and in practice this macro is more up-to-date than Autoconf
+# is, so override Autoconf unconditionally.
AC_DEFUN([AC_C_RESTRICT],
[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
[ac_cv_c_restrict=no
# The order here caters to the fact that C++ does not require restrict.
for ac_kw in __restrict __restrict__ _Restrict restrict; do
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
- [[typedef int * int_ptr;
- int foo (int_ptr $ac_kw ip) {
- return ip[0];
- }]],
- [[int s[1];
- int * $ac_kw t = s;
- t[0] = 0;
- return foo(t)]])],
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[typedef int *int_ptr;
+ int foo (int_ptr $ac_kw ip) { return ip[0]; }
+ int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
+ int bar (int ip[$ac_kw]) { return ip[0]; }
+ ]],
+ [[int s[1];
+ int *$ac_kw t = s;
+ t[0] = 0;
+ return foo (t) + bar (t);
+ ]])],
[ac_cv_c_restrict=$ac_kw])
test "$ac_cv_c_restrict" != no && break
done
@@ -348,21 +350,21 @@ AC_DEFUN([AC_C_RESTRICT],
nothing if this is not supported. Do not define if restrict is
supported directly. */
#undef restrict
-/* Work around a bug in Sun C++: it does not support _Restrict, even
- though the corresponding Sun C compiler does, which causes
- "#define restrict _Restrict" in the previous line. Perhaps some future
- version of Sun C++ will work with _Restrict; if so, it'll probably
- define __RESTRICT, just as Sun C does. */
+/* Work around a bug in Sun C++: it does not support _Restrict or
+ __restrict__, even though the corresponding Sun C compiler ends up with
+ "#define restrict _Restrict" or "#define restrict __restrict__" in the
+ previous line. Perhaps some future version of Sun C++ will work with
+ restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
#if defined __SUNPRO_CC && !defined __RESTRICT
# define _Restrict
+# define __restrict__
#endif])
case $ac_cv_c_restrict in
restrict) ;;
no) AC_DEFINE([restrict], []) ;;
*) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
esac
-])
-])
+])# AC_C_RESTRICT
# gl_BIGENDIAN
# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.