From c21adbb0b230ffba97cf5d059e2bd024e13a37df Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Sat, 22 Apr 2017 11:54:57 -0700
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Subject: [PATCH] configure: Check for -Wno-error=format-truncation compiler
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option
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If this option is supported by compiler then disable it ( gcc7+)
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Fixes
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client.c:834:23: error: '%s' directive output may be truncated writing up to 1023 bytes into a region of size 1010 [-Werror=format-truncation=]
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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---
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acinclude/ax_check_compile_flag.m4 | 74 ++++++++++++++++++++++++++++++++++++++
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configure.ac | 2 ++
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2 files changed, 76 insertions(+)
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create mode 100644 acinclude/ax_check_compile_flag.m4
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diff --git a/acinclude/ax_check_compile_flag.m4 b/acinclude/ax_check_compile_flag.m4
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new file mode 100644
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index 0000000..dcabb92
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--- /dev/null
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+++ b/acinclude/ax_check_compile_flag.m4
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@@ -0,0 +1,74 @@
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+# ===========================================================================
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+# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
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+# ===========================================================================
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+#
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+# SYNOPSIS
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+#
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+# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
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+#
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+# DESCRIPTION
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+#
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+# Check whether the given FLAG works with the current language's compiler
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+# or gives an error. (Warnings, however, are ignored)
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+#
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+# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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+# success/failure.
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+#
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+# If EXTRA-FLAGS is defined, it is added to the current language's default
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+# flags (e.g. CFLAGS) when the check is done. The check is thus made with
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+# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
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+# force the compiler to issue an error when a bad flag is given.
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+#
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+# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
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+#
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+# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
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+# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
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+#
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+# LICENSE
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+#
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+# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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+# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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+#
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+# This program is free software: you can redistribute it and/or modify it
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+# under the terms of the GNU General Public License as published by the
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+# Free Software Foundation, either version 3 of the License, or (at your
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+# option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful, but
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+# WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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+# Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License along
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+# with this program. If not, see <https://www.gnu.org/licenses/>.
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+#
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+# As a special exception, the respective Autoconf Macro's copyright owner
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+# gives unlimited permission to copy, distribute and modify the configure
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+# scripts that are the output of Autoconf when processing the Macro. You
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+# need not follow the terms of the GNU General Public License when using
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+# or distributing such scripts, even though portions of the text of the
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+# Macro appear in them. The GNU General Public License (GPL) does govern
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+# all other use of the material that constitutes the Autoconf Macro.
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+#
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+# This special exception to the GPL applies to versions of the Autoconf
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+# Macro released by the Autoconf Archive. When you make and distribute a
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+# modified version of the Autoconf Macro, you may extend this special
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+# exception to the GPL to apply to your modified version as well.
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+
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+#serial 5
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+
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+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
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+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
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+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
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+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
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+ ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
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+ _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
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+ AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
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+ [AS_VAR_SET(CACHEVAR,[yes])],
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+ [AS_VAR_SET(CACHEVAR,[no])])
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+ _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
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+AS_VAR_IF(CACHEVAR,yes,
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+ [m4_default([$2], :)],
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+ [m4_default([$3], :)])
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+AS_VAR_POPDEF([CACHEVAR])dnl
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+])dnl AX_CHECK_COMPILE_FLAGS
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diff --git a/configure.ac b/configure.ac
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index ff4688c..9382fdf 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -26,6 +26,7 @@ m4_include([acinclude/pkg.m4])
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m4_include([acinclude/lib-checks.m4])
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m4_include([acinclude/ax_cxx_compile_stdcxx_11.m4])
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m4_include([acinclude/ax_cxx_0x_types.m4])
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+m4_include([acinclude/ax_check_compile_flag.m4])
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HOSTCXX="$BUILD_CXX"
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PRESET_CFLAGS="$CFLAGS"
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@@ -44,6 +45,7 @@ AC_PROG_CXX
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AC_LANG([C++])
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AC_CANONICAL_HOST
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+AX_CHECK_COMPILE_FLAG([-Werror=format-truncation],[CFLAGS="$CFLAGS -Wno-error=format-truncation" CXXFLAGS="$CXXFLAGS -Wno-error=format-truncation"])
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# Clang 3.2 on some CPUs requires -march-native to detect correctly.
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# GCC 4.3+ can also produce faster executables when its used.
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# But building inside a virtual machine environment has been found to
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