[Openvpn-devel] Get rid of ax_check_compile_flag.m4

Message ID 20180220202508.16201-1-steffan@karger.me
State Accepted
Headers show
  • [Openvpn-devel] Get rid of ax_check_compile_flag.m4
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Commit Message

Steffan Karger Feb. 20, 2018, 8:25 p.m.
The macro was too new for some of the platforms we still support.  In
particular, centos/rhel 6 and opensolaris 10.  To work around that, we
introduce our own simpler and more tailored ACL_CHECK_ADD_COMPILE_FLAGS
macro, that not only checks but also sets the flags in CFLAGS if it is
accepted.  Since this doesn't use new-and-shine autoconf features, it
should also work on the legacy platforms.

Signed-off-by: Steffan Karger <steffan@karger.me>
 configure.ac                | 18 ++++++-----
 m4/ax_check_compile_flag.m4 | 74 ---------------------------------------------
 2 files changed, 10 insertions(+), 82 deletions(-)
 delete mode 100644 m4/ax_check_compile_flag.m4


Gert Doering Feb. 21, 2018, 7:13 p.m. | #1
Acked-by: Gert Doering <gert@greenie.muc.de>

Tested on OpenSolaris (since this one of my buildslaves), and the problem
goes away.  So I assume Centos6 should be fine, too.

AIX7 is still working :)

Your patch has been applied to the master and release/2.4 branch.

commit 6a5d10e96b9ad2f9a9472aeee8cdb7c02fe4d050 (master)
commit fc70bc8b30eab2bea5e9486182184b1b6b7ceb60 (release/2.4)
Author: Steffan Karger
Date:   Tue Feb 20 21:25:08 2018 +0100

     Get rid of ax_check_compile_flag.m4

     Signed-off-by: Steffan Karger <steffan@karger.me>
     Acked-by: Gert Doering <gert@greenie.muc.de>
     Message-Id: <20180220202508.16201-1-steffan@karger.me>
     URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg16515.html
     Signed-off-by: Gert Doering <gert@greenie.muc.de>

kind regards,

Gert Doering

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diff --git a/configure.ac b/configure.ac
index 1496fd55..626b4dd4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1292,15 +1292,17 @@  if test "${enable_pkcs11}" = "yes"; then
-	[-Wno-unused-function],
-	[CFLAGS="-Wno-unused-function ${CFLAGS}"]
+    old_cflags="$CFLAGS"
+    CFLAGS="$1 $CFLAGS"
+    AC_MSG_CHECKING([whether the compiler acceppts $1])
+        [AC_MSG_RESULT([no]); CFLAGS="$old_cflags"])]
-	[-Wno-unused-parameter],
-	[CFLAGS="-Wno-unused-parameter ${CFLAGS}"]
 if test "${enable_pedantic}" = "yes"; then
diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
deleted file mode 100644
index dcabb92a..00000000
--- a/m4/ax_check_compile_flag.m4
+++ /dev/null
@@ -1,74 +0,0 @@ 
-# ===========================================================================
-#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
-# ===========================================================================
-#   Check whether the given FLAG works with the current language's compiler
-#   or gives an error.  (Warnings, however, are ignored)
-#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
-#   success/failure.
-#   If EXTRA-FLAGS is defined, it is added to the current language's default
-#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
-#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
-#   force the compiler to issue an error when a bad flag is given.
-#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
-#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
-#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
-#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
-#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   Public License for more details.
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <https://www.gnu.org/licenses/>.
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-#serial 5
-[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
-AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
-  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
-  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
-    [AS_VAR_SET(CACHEVAR,[yes])],
-    [AS_VAR_SET(CACHEVAR,[no])])
-  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
-  [m4_default([$2], :)],
-  [m4_default([$3], :)])