#							-*- 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_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
    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

# 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 "$host_cpu" in
    i686)
	ARCH=${ARCH:="-mcpu=pentiumpro -march=pentiumpro -malign-double"}
	;;
esac

# Compiler flags
case "$cc_vendor-$cc_version" in
    gcc-2.7*)
	# General
	CFLAGS="$CFLAGS -ansi"

	# Production
	PROC_CFLAGS="-O3 $NOFP -finline-functions -Wno-shadow"
	PROD_CPPFLAGS=

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

	# Profile
	PROFILE_CFLAGS=-pg
	PROFILE_CPPFLAGS=

	# Flags are set
	cc_flags_set=yes
	;;

    gcc-2.8.*)
        # General
        CFLAGS="$CFLAGS -Wsign-compare"

	# Production
	PROD_CFLAGS="$ARCH -O3 $NOFP -finline-functions -fschedule-insns2 -Wno-shadow"
	PROD_CPPFLAGS=

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

	# Profile
	PROFILE_CFLAGS=-pg
	PROFILE_CPPFLAGS=

	# Flags are set
	cc_flags_set=yes
	;;

    gcc-2.95)
	# General
	CFLAGS="$CFLAGS -Wsign-compare"

	# Production
	PROD_CFLAGS="$ARCH -O6 $NOFP -Wno-shadow"
	PROD_CPPFLAGS=

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

	# Profile
	PROFILE_CFLAGS=-pg
	PROFILE_CPPFLAGS=

	# Flags are set
	cc_flags_set=yes
	;;

    egcs-2.*|pgcc-2.*)
	# General
	CFLAGS="$CFLAGS -Wsign-compare"

	# Production
	PROD_CFLAGS="$ARCH -O6 $NOFP -Wno-shadow"
	PROD_CPPFLAGS=

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

	# Profile
	PROFILE_CFLAGS=-pg
	PROFILE_CPPFLAGS=

	# Flags are set
	cc_flags_set=yes
	;;

    gcc-*|egcs-*|pgcc-*)
        # This must be some other GNU compiler that we don't know about.
        # Just use fairly generic flags.

	# Production
	PROD_CFLAGS=-O
	PROD_CPPFLAGS=

	# Debug
	DEBUG_CFLAGS=-g
	DEBUG_CPPFLAGS=

	# Profile
	PROFILE_CFLAGS=-pg
	PROFILE_CPPFLAGS=

	# 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