+dnl SG_COMPILE_FLAGS
+dnl Turn on many useful compiler warnings
+dnl For now, only sets extra flags on GCC
-dnl GNOME_COMPILE_WARNINGS
-dnl Turn on many useful compiler warnings
-dnl For now, only works on GCC
-AC_DEFUN([GNOME_COMPILE_WARNINGS],[
- AC_ARG_ENABLE(compile-warnings,
- [ --enable-compile-warnings=[no/minimum/yes] Turn on compiler warnings.],,enable_compile_warnings=yes)
+dnl Copyright (C) 2004, 2005, 2007. Martin Quinson. All rights reserved.
- AC_MSG_CHECKING(the warning flags for this compiler)
- warnCFLAGS=
- if test "x$GCC" = "xyes"; then
- case " $CFLAGS " in
- *-Wall*) ;;
- *) warnCFLAGS="-g -Wall -Wunused" ;;
- esac
+dnl This file is part of the SimGrid project. This is free software:
+dnl You can redistribute and/or modify it under the terms of the
+dnl GNU LGPL (v2.1) licence.
- ## -W is not all that useful. And it cannot be controlled
- ## with individual -Wno-xxx flags, unlike -Wall
- if test "x$enable_compile_warnings" = "xyes"; then
- warnCFLAGS="$warnCFLAGS -Wmissing-prototypes -Wmissing-declarations \
- -finline-functions -Wshadow -Wpointer-arith -Wchar-subscripts -Wcomment \
- -Wformat=2 -Wno-unused-variable -Wno-unused-function -Wwrite-strings \
- -Werror -O0"
- fi
- fi
- AC_MSG_RESULT($warnCFLAGS)
+AC_DEFUN([SG_COMPILE_FLAGS],[
+ AC_ARG_ENABLE(compile-warnings,
+ AS_HELP_STRING([--enable-compile-warnings], [use compiler warnings (default=no, unless in maintainer mode)]),
+ enable_compile_warnings=$enableval,enable_compile_warnings=no)
- AC_ARG_ENABLE(iso-c,
- [ --enable-iso-c Try to warn if code is not ISO C ],,
- enable_iso_c=no)
+ AC_ARG_ENABLE(compile-optimizations,
+ AS_HELP_STRING([--disable-compile-optimizations], [use compiler optimizations (default=yes, unless if CFLAGS is explicitly set)]),
+ enable_compile_optimizations=$enableval,enable_compile_optimizations=auto)
- AC_MSG_CHECKING(the language compliance flags for this compiler)
- complCFLAGS=
- if test "x$GCC" = "xyes"; then
- case " $CFLAGS " in
- *-ansi*) ;;
- *) complCFLAGS="$complCFLAGS -ansi" ;;
+ # AC PROG CC tests whether -g is accepted.
+ # Cool, but it also tries to set -O2 and -g.
+ # I don't want it with gcc, but -O3 and -g2, and optimization only when asked by user
+ case $CC in
+ *gcc)
+ if test "$CFLAGS" = "-g -O2" ; then
+ CFLAGS="-g3"
+ fi
+ if test "$CXXFLAGS" = "-g -O2" ; then
+ CXXFLAGS="-g3"
+ fi
+ if test "$GCJFLAGS" = "-g -O2" ; then
+ CXXFLAGS="-g3"
+ fi;;
esac
- case " $CFLAGS " in
- *-pedantic*) ;;
- *) complCFLAGS="$complCFLAGS -pedantic" ;;
- esac
- fi
- AC_MSG_RESULT($complCFLAGS)
-
-
- AC_MSG_CHECKING(the optimization flags for this compiler)
- optCFLAGS=
- if test "x$GCC" = "xyes" ; then
- optCFLAGS="-ffast-math -funroll-loops -fno-strict-aliasing"
+ if test "x$enable_compile_warnings" = "xyes" ; then
+ AC_MSG_CHECKING(the warning flags for this compiler)
+ warnCFLAGS=
+ if test "x$CC" = "xgcc" || test "x$GCC" = "xyes" ; then
case " $CFLAGS " in
- *-O*) ;;
- *) optCFLAGS="$optCFLAGS -03" ;;
+ *-Wall*) ;;
+ *) warnCFLAGS="-Wall -Wunused" ;;
esac
- fi
- AC_MSG_RESULT($optCFLAGS)
- # Take the right flags
- if test "x$cflags_set" != "xyes" ; then
- if test "x$enable_iso_c" != "xno"; then
- CFLAGS="$CFLAGS $complCFLAGS $optCFLAGS"
+ ## -W is not all that useful. And it cannot be controlled
+ ## with individual -Wno-xxx flags, unlike -Wall
+
+ ## -Wformat=2 chokes on the snprintf replacement because the format is passed to real sprintf
+ ## -Wshadow chokes on try{ try{} } constructs
+ if test "x$enable_compile_warnings" = "xyes"; then
+ warnCFLAGS=`echo $warnCFLAGS -Wmissing-prototypes -Wmissing-declarations \
+ -Wpointer-arith -Wchar-subscripts -Wcomment -Wformat -Wwrite-strings \
+ -Wno-unused-function -Wno-strict-aliasing \
+ -Werror \
+ | sed 's/ +/ /g'`
+ # -Wno-unused-variable -Wno-unused-label
+ fi
+ fi
+ AC_MSG_RESULT($warnCFLAGS)
+ # placed before since gcc remembers the last one on conflict
+ CFLAGS="$warnCFLAGS $CFLAGS"
+ fi
+
+ if test "x$enable_compile_optimizations" = "xyes" ||
+ test "x$enable_compile_optimizations" = "xauto" ; then
+ AC_MSG_CHECKING(the optimization flags for this compiler)
+ optCFLAGS=
+ if test "x$CC" = "xgcc" || test "x$GCC" = "xyes" ; then
+ case " $CFLAGS " in
+ *-O*) ;;
+ *) optCFLAGS="$optCFLAGS -O3" ;;
+ esac
+ optCFLAGS="$optCFLAGS -finline-functions -ffast-math -funroll-loops -fno-strict-aliasing"
+
+ GCC_VER=`gcc --version | head -n 1 | sed 's/^[^0-9]*\([^ ]*\).*$/\1/'`
+ GCC_VER_MAJ=`echo $GCC_VER | sed 's/^\(.\).*$/\1/'`
+ if test "x$target_cpu" = "xpowerpc" && test "x$GCC_VER_MAJ" == "x3" ; then
+ # avoid gcc bug #12828, which apeared in 3.x branch and is fixed in 3.4.0
+ # but the check would be too complicated to get 3.4.
+ # Instead, rule out any 3.x compiler.
+
+ # Note that the flag didn't exist before gcc 3.0
+ optCFLAGS="$optCFLAGS -fno-loop-optimize"
+ fi
+ dnl A C_MSG_WARN(GCC_VER_MAJ=$GCC_VER_MAJ)
fi
- if test "x$enable_compile_warnings" != "xno" ; then
- CFLAGS="$CFLAGS $warnCFLAGS $optCFLAGS"
- fi
-
- cflags_set=yes
- AC_SUBST(cflags_set)
+ AC_MSG_RESULT($optCFLAGS)
+ # Take it only if CFLAGS not explicitly set. Unless the flag was explicitly given
+ if test "x$cflags_set" != "xyes" ; then
+ CFLAGS="$optCFLAGS $CFLAGS"
+ fi
+ fi
+
+ if test x$lt_cv_prog_gnu_ld = xyes ; then
+ LD_DYNAMIC_FLAGS=-Wl,--export-dynamic
+ else
+ LD_DYNAMIC_FLAGS=
fi
+ AC_SUBST(LD_DYNAMIC_FLAGS)
+
])
