#                            -*- shell-script -*-
#
# Copyright by The HDF Group.
# Copyright by the Board of Trustees of the University of Illinois.
# All rights reserved.
#
# This file is part of HDF5.  The full HDF5 copyright notice, including
# terms governing use, modification, and redistribution, is contained in
# the COPYING file, which can be found at the root of the source code
# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
# If you do not have access to either file, you may request a copy from
# help@hdfgroup.org.


# 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'
#

#
# For now, do not promote any warnings to errors.
#
PROMOTE_ERRORS_DFLT=no

#
# This filter rewrites -Werror= as -W, in that way demoting warnings
# promoted to errors back to warnings, if PROMOTE_ERRORS is no.
#
demote_errors()
{
	if [ ${PROMOTE_ERRORS:-${PROMOTE_ERRORS_DFLT}} = no ]; then
		sed 's,-Werror=,-W,g'
	else
		cat
	fi
}

#
# Prepend `$srcdir/config/gnu-` to the filename suffix(es) given as
# subroutine argument(s), remove comments starting with # and ending
# at EOL, replace spans of whitespace (including newlines) with spaces,
# and re-emit the file(s) thus filtered on the standard output stream.
#
load_gcc_arguments()
{
    set -- $(for arg; do
        sed 's,#.*$,,' $srcdir/config/gnu-warnings/${arg} | demote_errors
    done)
    IFS=' ' echo "$*"
}


# Get the compiler version in a way that works for gcc
# unless a compiler version is already known
#
#   cc_vendor:    The compiler name: gcc
#   cc_version:   Version number: 2.91.60, 2.7.2.1
#
if test "X-" = "X-$cc_flags_set"; then
    # PathScale compiler spits out gcc version string too. Need to
    # filter it out.
    # icc beginning with version 12 includes a "gcc version compatiblilty"
    # string, causing the gcc H5_CFLAGS to be erroneously added.  The line
    # "grep -v 'icc version'" causes the discarding of any output
    # containing 'icc version'.  The cc_version for icc is correctly determined
    # and flags added in the intel-flags script.
    cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 | grep -v 'PathScale' |\
        grep -v 'icc version' |\
        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

    # Get the compiler 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

# Common GCC flags for various situations
case "$cc_vendor-$cc_version" in
  gcc*)

    ###############################
    # Architecture-specific flags #
    ###############################

    arch=
    case "$host_os-$host_cpu" in
        # FreeBSD sets the information from "uname -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*-i386)
            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*)
                    # architecture-specific optimizations cause problems
                    # for some users who build binaries to be used on
                    # multiple architectures.
                    # arch="-march=i686"
                ;;
            esac
            ;;

        *-i686)
                    # architecture-specific optimizations cause problems
                    # for some users who build binaries to be used on
                    # multiple architectures.
                    # arch="-march=i686"
            ;;
    esac

    case "$host_os-$host_cpu" in
        # cygwin needs the "-std=c99" flag removed, so make
        # a specific case for Cygwin without the flag and a default
        # case to add the flag everywhere else
        cygwin-*)
            ;;

        *)
            H5_CFLAGS="$H5_CFLAGS -std=c99"
            ;;
    esac

    # General
    H5_CFLAGS="$H5_CFLAGS $arch"

    ##############
    # Production #
    ##############

    # NDEBUG is handled explicitly by the configure script
    if test $cc_vers_major -le 4; then
        PROD_CFLAGS=
    else
        PROD_CFLAGS="-fstdarg-opt"
    fi
    PROD_CPPFLAGS=

    #########
    # Debug #
    #########

    # NDEBUG is handled explicitly by the configure script
    # -g is handled by the symbols flags
    if test $cc_vers_major -le 4; then
        DEBUG_CFLAGS=
    else
        DEBUG_CFLAGS="-ftrapv -fno-common"
    fi
    DEBUG_CPPFLAGS=

    #############
    # Profiling #
    #############

    PROFILE_CFLAGS="-pg"
    PROFILE_CPPFLAGS=
    ;;
esac

    ############
    # Warnings #
    ############

# Version specific GCC flags
#
case "$cc_vendor-$cc_version" in
  # older compiler versions
  gcc-4.1.*)
    # Disable warnings about using 'long long' type
    H5_CFLAGS="$H5_CFLAGS -Wno-long-long"

    # Append warning flags from gcc-3* case
    # (don't use -Wpadded flag for normal builds, many of the warnings its
    #   issuing can't be fixed and they are making it hard to detect other,
    #   more important warnings)
    #H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"
    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute"

    # Append warning flags from gcc-3.2* case
    H5_CFLAGS="$H5_CFLAGS -Wmissing-noreturn -Wpacked -Wdisabled-optimization"

    # Enable more format checking flags, beyond the basic -Wformat included
    # in -Wall
    H5_CFLAGS="$H5_CFLAGS -Wformat=2"

    # The "unreachable code" warning does not appear to be reliable yet...
    H5_CFLAGS="$H5_CFLAGS -Wunreachable-code"

    # Append warning flags from gcc-3.3* case
    H5_CFLAGS="$H5_CFLAGS -Wendif-labels"

    # Append warning flags from gcc-3.4* case
    H5_CFLAGS="$H5_CFLAGS -Wdeclaration-after-statement -Wold-style-definition -Winvalid-pch"

    # Replace old -W flag with new -Wextra flag
    H5_CFLAGS="`echo $H5_CFLAGS | sed -e 's/-W\ /-Wextra\ /g'`"

    # Append more extra warning flags that only gcc 4.0+ know about
    H5_CFLAGS="$H5_CFLAGS -Wvariadic-macros -Wnonnull -Winit-self -Wmissing-include-dirs -Wswitch-default -Wswitch-enum -Wunused-macros"

    # Append more extra warning flags that only gcc 4.1+ know about
    H5_CFLAGS="$H5_CFLAGS -Wunsafe-loop-optimizations -Wc++-compat -Wvolatile-register-var"
    ;;

  gcc-4.0*)
    # Disable warnings about using 'long long' type
    H5_CFLAGS="$H5_CFLAGS -Wno-long-long"

    # Append warning flags from gcc-3* case
    # (don't use -Wpadded flag for normal builds, many of the warnings its
    #   issuing can't be fixed and they are making it hard to detect other,
    #   more important warnings)
    #H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"
    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute"

    # Append warning flags from gcc-3.2* case
    H5_CFLAGS="$H5_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 warning flags from gcc-3.3* case
    H5_CFLAGS="$H5_CFLAGS -Wendif-labels"

    # Append warning flags from gcc-3.4* case
    H5_CFLAGS="$H5_CFLAGS -Wdeclaration-after-statement -Wold-style-definition -Winvalid-pch"

    # Replace old -W flag with new -Wextra flag
    H5_CFLAGS="`echo $H5_CFLAGS | sed -e 's/-W\ /-Wextra\ /g'`"

    # Append more extra warning flags that only gcc 4.0+ know about
    H5_CFLAGS="$H5_CFLAGS -Wvariadic-macros -Wnonnull -Winit-self -Wmissing-include-dirs -Wswitch-default -Wswitch-enum -Wunused-macros"
    ;;

  gcc-3.4*)
    # Disable warnings about using 'long long' type
    H5_CFLAGS="$H5_CFLAGS -Wno-long-long"

    # Append warning flags from gcc-3* case
    # (don't use -Wpadded flag for normal builds, many of the warnings its
    #   issuing can't be fixed and they are making it hard to detect other,
    #   more important warnings)
    #H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"
    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute"

    # Append warning flags from gcc-3.2* case
    H5_CFLAGS="$H5_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 warning flags from gcc-3.3* case
    H5_CFLAGS="$H5_CFLAGS -Wendif-labels"

    # Append more extra warning flags that only gcc3.4+ know about
    H5_CFLAGS="$H5_CFLAGS -Wdeclaration-after-statement -Wold-style-definition -Winvalid-pch"

    # Replace old -W flag with new -Wextra flag
    H5_CFLAGS="`echo $H5_CFLAGS | sed -e 's/-W\ /-Wextra\ /g'`"
    ;;

  gcc-3.3*)
    # Disable warnings about using 'long long' type
    H5_CFLAGS="$H5_CFLAGS -Wno-long-long"

    # Append warning flags from gcc-3* case
    # (don't use -Wpadded flag for normal builds, many of the warnings its
    #   issuing can't be fixed and they are making it hard to detect other,
    #   more important warnings)
    #H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"
    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute"

    # Append warning flags from gcc-3.2* case
    H5_CFLAGS="$H5_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
    H5_CFLAGS="$H5_CFLAGS -Wendif-labels"
    ;;

  gcc-3.2*)
    # Disable warnings about using 'long long' type
    H5_CFLAGS="$H5_CFLAGS -Wno-long-long"

    # Append warning flags from gcc-3* case
    # (don't use -Wpadded flag for normal builds, many of the warnings its
    #   issuing can't be fixed and they are making it hard to detect other,
    #   more important warnings)
    #H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"
    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute"

    # Append more extra warning flags that only gcc3.2+ know about
    H5_CFLAGS="$H5_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"
    ;;

  gcc-3*)
    # Disable warnings about using 'long long' type
    H5_CFLAGS="$H5_CFLAGS -Wno-long-long"

    # Append some extra warning flags that only gcc3+ know about
    # (don't use -Wpadded flag for normal builds, many of the warnings its
    #   issuing can't be fixed and they are making it hard to detect other,
    #   more important warnings)
    #H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"
    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute"
    ;;

  gcc-*)

    ###########
    # General #
    ###########

    H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments general)"
    H5_ECFLAGS="$H5_ECFLAGS $(load_gcc_arguments error-general)"

    ######################
    # Developer warnings #
    ######################

    NO_DEVELOPER_WARNING_CFLAGS=$(load_gcc_arguments no-developer-general)
    DEVELOPER_WARNING_CFLAGS=$(load_gcc_arguments developer-general)

    #######################
    # gcc 4 special cases #
    #######################

    # GCC 4.2 through 4.6
    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2 -o $cc_vers_major -eq 4 -a $cc_vers_minor -le 6; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.2-4.6)"
    fi

    # GCC 4.2 through 4.3
    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2 -o $cc_vers_major -eq 4 -a $cc_vers_minor -le 3; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.2-4.3)"
    fi 

    # GCC 4.5 through 4.6
    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -le 6; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.5-4.6)"
    fi

    # GCC 4.2 through 4.4
    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2 -a $cc_vers_major -eq 4 -a $cc_vers_minor -le 4; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.2-4.4)"
    fi

    # GCC 4.2 through the end of GCC 4 series
    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.2-4.last)"
    fi

    #############################
    # Version-specific warnings #
    #############################

    # gcc >= 4.3
    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 3; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.3)"
    fi 

    # gcc >= 4.4
    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 4; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.4)"
    fi

    # gcc >= 4.5
    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 5; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.5)"
	DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments developer-4.5)"
	NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments no-developer-4.5)"
    fi

    # gcc >= 4.6
    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 6; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.6)"
	DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments developer-4.6)"
	NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments no-developer-4.6)"
    fi

    # gcc >= 4.7
    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 7; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.7)"
	DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments developer-4.7)"
	NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments no-developer-4.7)"
    fi

    # gcc >= 4.8
    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 8; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.8)"
	DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments developer-4.8)"
	NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments no-developer-4.8)"
    fi

    # gcc >= 4.9
    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 9; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 4.9)"
    fi

    # gcc >= 5
    if test $cc_vers_major -ge 5; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 5)"
        H5_ECFLAGS="$H5_ECFLAGS $(load_gcc_arguments error-5)"
    fi

    # gcc >= 6
    if test $cc_vers_major -ge 6; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 6)"
    fi

    # gcc >= 7
    if test $cc_vers_major -ge 7; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 7)"
	DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments developer-7)"
    fi

    # gcc 8
    if test $cc_vers_major -ge 8; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 8)"
        H5_ECFLAGS="$H5_ECFLAGS $(load_gcc_arguments error-8)"
	DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments developer-8)"
	NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gcc_arguments no-developer-8)"
    fi

    # gcc 9
    if test $cc_vers_major -ge 9; then
        H5_CFLAGS="$H5_CFLAGS $(load_gcc_arguments 9)"
    fi
    ;;
esac

    #################
    # Flags are set #
    #################
    cc_flags_set=yes
fi

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