Several fixes related to ARC PIE support.

[deliverable/binutils-gdb.git] / bfd / warning.m4

diff --git a/bfd/warning.m4 b/bfd/warning.m4
index 2e2dd424c0f76432446e9d22e063e110a554b7c9..4c5b55d1f8c7896b8bb1e32d0c1abad2eb4ac403 100644 (file)
--- a/bfd/warning.m4
+++ b/bfd/warning.m4
@@ -1,18 +1,59 @@
-dnl Common configure.in fragment
+dnl Common configure.ac fragment
+dnl
+dnl   Copyright (C) 2012-2016 Free Software Foundation, Inc.
+dnl
+dnl This file is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; see the file COPYING3.  If not see
+dnl <http://www.gnu.org/licenses/>.
+dnl
 
 AC_DEFUN([AM_BINUTILS_WARNINGS],[
+# Set the 'development' global.
+. $srcdir/../bfd/development.sh
+
+# Default set of GCC warnings to enable.
 GCC_WARN_CFLAGS="-W -Wall -Wstrict-prototypes -Wmissing-prototypes"
 
+# Add -Wshadow if the compiler is a sufficiently recent version of GCC.
+AC_EGREP_CPP([^[0-3]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wshadow")
+
+# Add -Wstack-usage if the compiler is a sufficiently recent version of GCC.
+AC_EGREP_CPP([^[0-4]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144")
+
+# Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings.
+WARN_WRITE_STRINGS=""
+AC_EGREP_CPP([^[0-3]$],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings")
+
 AC_ARG_ENABLE(werror,
-  [  --enable-werror    treat compile warnings as errors],
+  [  --enable-werror         treat compile warnings as errors],
   [case "${enableval}" in
      yes | y) ERROR_ON_WARNING="yes" ;;
      no | n)  ERROR_ON_WARNING="no" ;;
      *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
    esac])
 
-# Enable -Werror by default when using gcc
-if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
+# Disable -Wformat by default when using gcc on mingw
+case "${host}" in
+  *-*-mingw32*)
+    if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
+      GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wno-format"
+    fi
+    ;;
+  *) ;;
+esac
+
+# Enable -Werror by default when using gcc.  Turn it off for releases.
+if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" -a "$development" = true ; then
     ERROR_ON_WARNING=yes
 fi
 
@@ -21,13 +62,13 @@ if test "${ERROR_ON_WARNING}" = yes ; then
     GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Werror"
     NO_WERROR="-Wno-error"
 fi
-                  
+
 if test "${GCC}" = yes ; then
   WARN_CFLAGS="${GCC_WARN_CFLAGS}"
 fi
 
 AC_ARG_ENABLE(build-warnings,
-[  --enable-build-warnings Enable build-time compiler warnings],
+[  --enable-build-warnings enable build-time compiler warnings],
 [case "${enableval}" in
   yes) WARN_CFLAGS="${GCC_WARN_CFLAGS}";;
   no)  if test "${GCC}" = yes ; then
@@ -46,4 +87,5 @@ fi
 
 AC_SUBST(WARN_CFLAGS)
 AC_SUBST(NO_WERROR)
+     AC_SUBST(WARN_WRITE_STRINGS)
 ])