hdf5/config/gnu-flags

#							-*- shell-script -*-
#
# This file should be sourced into configure if the compiler is the
# GNU gcc compiler or a derivative.  It is careful not to do anything
# if the compiler is not GNU; otherwise `cc_flags_set' is set to `yes'
#

# Get the compiler version in a way that works for gcc, egcs, and
# pgcc unless a compiler version is already known
#
#   cc_vendor:    The compiler name: gcc, egcs, or pgcc
#   cc_version:   Version number: 2.91.60, 2.7.2.1
#
if test X = "X$cc_flags_set"; then
    cc_version="`$CC $CFLAGS -v 2>&1 |grep 'gcc version' |\
	        sed 's/.*gcc version \([-a-z0-9\.]*\).*/\1/'`"
    cc_vendor=`echo $cc_version |sed 's/\([a-z]*\).*/\1/'`
    cc_version=`echo $cc_version |sed 's/[-a-z]//g'`
    if test X = "X$cc_vendor" -a X != "X$cc_version"; then
	cc_vendor=gcc
    fi
    if test "-" != "$cc_vendor-$cc_version"; then
	echo "compiler '$CC' is GNU $cc_vendor-$cc_version"
    fi

    # Some version numbers
    cc_vers_major=`echo $cc_version | cut -f1 -d.`
    cc_vers_minor=`echo $cc_version | cut -f2 -d.`
    cc_vers_patch=`echo $cc_version | cut -f3 -d.`
    test -n "$cc_vers_major" || cc_vers_major=0
    test -n "$cc_vers_minor" || cc_vers_minor=0
    test -n "$cc_vers_patch" || cc_vers_patch=0
    cc_vers_all=`expr $cc_vers_major '*' 1000000 + $cc_vers_minor '*' 1000 + $cc_vers_patch`
fi

# GCC compilers before gcc-2.8.1 have problems with `long long'.
if test gcc = "$cc_vendor" -a "$cc_vers_all" -lt 2008001; then
    cat <<EOF
    **
    ** This compiler may be unable to properly compile the long long
    ** data type used extensively by hdf5, although specifying
    ** --disable-hsizet for configure may work around those bugs.
    ** There may be other code generation problems also, especially
    ** when optimizations are enabled.  Please upgrade to at least GNU
    ** gcc version 2.8.1 before reporting bugs to the HDF5 team.
    **
EOF
    sleep 5

# Current EGCS compilers have problems with `long long' and register
# allocation when optimizations are turned on for x86 systems.
elif test egcs = "$cc_vendor" -a "$cc_vers_all" -le 2091066; then
    if test "$HSIZET" != "large"; then
       cat <<EOF
    **
    ** This compiler may have problems allocating registers when
    ** optimizations are enabled on some platforms. Specifying
    ** --disable-hsizet usually avoids the bug.
    **
EOF
       sleep 5
    fi

# All current versions of PGCC have problems also.
elif test pgcc = "$cc_vendor" -a "$cc_vers_all" -le 2091066; then	    
    cat <<EOF
    **
    ** This compiler may have problems allocating registers for long
    ** long data types when optimizations are enabled. There may be
    ** other code generation problems as well. We know of no version
    ** of pgcc which is capable of compiling HDF5 in production mode.
    ** Please use gcc-2.8 or egcs-1.1.1 before reporting bugs.
    **
EOF
    sleep 5

fi

# Architecture-specific flags
case "$host_os-$host_cpu" in
    # FreeBSD sets the information from "hostname -m" to the general machine
    # architecture, not the specific CPU for the machine, so even our
    # Pentium II Xeon server is set to "i386".  Once we know we are on a FreeBSD
    # machine, use the "sysctl" command to get the CPU hardware model.
    freebsd*)
        host_cpu_model=`sysctl -n hw.model`
        case "$host_cpu_model" in
            # Hmm.. this might not catch Celerons, but it won't hurt them either...
            *Pro*|*II*|*III*|*IV*|*Athlon*)
                ARCH=${ARCH:="-march=i686"}
            ;;
        esac
        ;;

    *-i686)
        ARCH=${ARCH:="-march=i686"}
        ;;
esac

# Host-specific flags
case "`hostname`" in
    sleipnir.ncsa.uiuc.edu)
#        case "$cc_vendor-$cc_version" in
#            gcc-3*)
#                ARCH="`echo $ARCH | sed -e 's/i686/athlon-mp/g'`"
#            ;;
#        esac
        ARCH="$ARCH -pipe"
        ;;
esac

# Common GCC flags for various situations
case "$cc_vendor-$cc_version" in
    gcc*|egcs*|pgcc*)
	# General
	CFLAGS="$CFLAGS $ARCH -ansi -pedantic -Wall -W -Wundef -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-qual -Wcast-align -Wwrite-strings -Wconversion -Wsign-compare -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wredundant-decls -Wnested-externs -Winline"

	# Production
        case "$cc_vendor-$cc_version" in
            gcc-2.95.[34]|gcc-3*)
                PROD_CFLAGS="-O3 $NOFP"
                ;;
            *)
                PROD_CFLAGS="-O $NOFP -finline-functions"
                ;;
        esac
	PROD_CPPFLAGS=

	# Debug
	DEBUG_CFLAGS="-g -fverbose-asm"
	DEBUG_CPPFLAGS=

	# Profile
	PROFILE_CFLAGS=-pg
	PROFILE_CPPFLAGS=

        ;;
esac

# Version specific GCC flags
#
# Please follow the pattern below by adding new versions at the top, copying
# the information from the previous version and adding modifications to that.
case "$cc_vendor-$cc_version" in
    gcc-3.3*)
        # Replace -ansi flag with -std=c99 flag
	CFLAGS="`echo $CFLAGS | sed -e 's/-ansi/-std=c99/g'`"

        # Append warning flags from gcc-2.95.* case
	CFLAGS="$CFLAGS -Wno-long-long"

        # Append warning flags from gcc-3* case
	CFLAGS="$CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"

        # Append warning flags from gcc-3.2* case
	CFLAGS="$CFLAGS -Wmissing-noreturn -Wpacked -Wdisabled-optimization"
        # The "format=2" warning generates too many warnings about valid
        # usage in the library.
	#CFLAGS="$CFLAGS -Wformat=2"
        # The "unreachable code" warning does not appear to be reliable yet...
	#CFLAGS="$CFLAGS -Wunreachable-code"

        # Append more extra warning flags that only gcc3.3+ know about
	CFLAGS="$CFLAGS -Wendif-labels"

	# Flags are set
	cc_flags_set=yes
	;;

    gcc-3.2*)
        # Replace -ansi flag with -std=c99 flag
	CFLAGS="`echo $CFLAGS | sed -e 's/-ansi/-std=c99/g'`"

        # Append warning flags from gcc-2.95.* case
	CFLAGS="$CFLAGS -Wno-long-long"

        # Append warning flags from gcc-3* case
	CFLAGS="$CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"

        # Append more extra warning flags that only gcc3.2+ know about
	CFLAGS="$CFLAGS -Wmissing-noreturn -Wpacked -Wdisabled-optimization"
        # The "format=2" warning generates too many warnings about valid
        # usage in the library.
	#CFLAGS="$CFLAGS -Wformat=2"
        # The "unreachable code" warning does not appear to be reliable yet...
	#CFLAGS="$CFLAGS -Wunreachable-code"

	# Flags are set
	cc_flags_set=yes
	;;

    gcc-3*)
        # Replace -ansi flag with -std=c99 flag
	CFLAGS="`echo $CFLAGS | sed -e 's/-ansi/-std=c99/g'`"

        # Append warning flags from gcc-2.95.* case
	CFLAGS="$CFLAGS -Wno-long-long"

        # Append some extra warning flags that only gcc3+ know about
	CFLAGS="$CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"

	# Flags are set
	cc_flags_set=yes
	;;

    gcc-2.95*)
        # Append some extra warning flags that only gcc2.95+ know about
	CFLAGS="$CFLAGS -Wno-long-long"

	# Flags are set
	cc_flags_set=yes
	;;
esac

# Clear cc info if no flags set
if test X = "X$cc_flags_set"; then
    cc_vendor=
    cc_version=
fi