+++ /dev/null
-
-
-dnl SG_COMPILE_FLAGS
-dnl Turn on many useful compiler warnings
-dnl For now, only sets extra flags on GCC
-
-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=$withval,enable_compile_warnings=no)
-
- AC_ARG_ENABLE(compile-optimizations,
- AS_HELP_STRING([--disable-compile-optimizations], [use compiler optimizations (default=yes, unless if CFLAGS is explicitly set)]),
- enable_compile_optimizations=$enableval,enable_compile_optimizations=auto)
-
- if test "x$cflags_set" != "xyes" ; then
- # if user didn't specify CFLAGS explicitely
-
- # AC PROG CC tests whether -g is accepted.
- # Cool, but it also tries to set -O2. I don't want it with gcc
- saveCFLAGS="$CFLAGS"
- CFLAGS=
- case " $saveCFLAGS " in
- *-g*) CFLAGS="-g" ;;
- esac
- case " $saveCFLAGS " in
- *-O2*) test "x$CC" = xgcc || CFLAGS="$CFLAGS -O2" ;;
- esac
-
- # damn AC PROG CC, why did you set -O??
- CFLAGS="-g"
- fi
-
- if test "x$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 " $CFLAGS " in
- *-Wall*) ;;
- *) warnCFLAGS="-Wall -Wunused" ;;
- esac
-
- ## -W is not all that useful. And it cannot be controlled
- ## with individual -Wno-xxx flags, unlike -Wall
- if test "x$enable_compile_warnings" = "xyes"; then
- warnCFLAGS=`echo $warnCFLAGS -Wmissing-prototypes -Wmissing-declarations \
- -Wshadow -Wpointer-arith -Wchar-subscripts -Wcomment -Wformat=2 -Wwrite-strings \
- -Wno-unused-variable -Wno-unused-function -Wno-unused-label \
- -Werror \
- | sed 's/ +/ /g'`
- fi
- fi
- AC_MSG_RESULT($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$GCC_VER_MAJ" != "x2" ; then
- # avoid gcc bug #12828, which is fixed in 3.4.0, but this version
- # isn't propagated enough to desserve an extra check
-
- # Note that the flag didn't exist before gcc 3.0
- optCFLAGS="$optCFLAGS -fno-loop-optimize"
- fi
- dnl A C_MSG_WARN(GCC_VER_MAJ=$GCC_VER_MAJ)
- fi
- AC_MSG_RESULT($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
-
-])
