#

# Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.

# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

#

# This code is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License version 2 only, as

# published by the Free Software Foundation.  Oracle designates this

# particular file as subject to the "Classpath" exception as provided

# by Oracle in the LICENSE file that accompanied this code.

#

# This code is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

# version 2 for more details (a copy is included in the LICENSE file that

# accompanied this code).

#

# You should have received a copy of the GNU General Public License version

# 2 along with this work; if not, write to the Free Software Foundation,

# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

#

# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

# or visit www.oracle.com if you need additional information or have any

# questions.

#

########################################################################

# This file is responsible for detecting, verifying and setting up the

# toolchain, i.e. the compiler, linker and related utilities. It will setup

# proper paths to the binaries, but it will not setup any flags.

#

# The binaries used is determined by the toolchain type, which is the family of

# compilers and related tools that are used.

########################################################################

# All valid toolchains, regardless of platform (used by help.m4)

VALID_TOOLCHAINS_all="gcc clang solstudio xlc microsoft"

# These toolchains are valid on different platforms

VALID_TOOLCHAINS_linux="gcc clang"

VALID_TOOLCHAINS_solaris="solstudio"

VALID_TOOLCHAINS_macosx="gcc clang"

VALID_TOOLCHAINS_aix="xlc"

VALID_TOOLCHAINS_windows="microsoft"

# Toolchain descriptions

TOOLCHAIN_DESCRIPTION_clang="clang/LLVM"

TOOLCHAIN_DESCRIPTION_gcc="GNU Compiler Collection"

TOOLCHAIN_DESCRIPTION_microsoft="Microsoft Visual Studio"

TOOLCHAIN_DESCRIPTION_solstudio="Oracle Solaris Studio"

TOOLCHAIN_DESCRIPTION_xlc="IBM XL C/C++"

# Setup a number of variables describing how native output files are

# named on this platform/toolchain.

AC_DEFUN([TOOLCHAIN_SETUP_FILENAME_PATTERNS],

[

  # Define filename patterns

  if test "x$OPENJDK_TARGET_OS" = xwindows; then

    LIBRARY_PREFIX=

    SHARED_LIBRARY_SUFFIX='.dll'

    STATIC_LIBRARY_SUFFIX='.lib'

    SHARED_LIBRARY='[$]1.dll'

    STATIC_LIBRARY='[$]1.lib'

    OBJ_SUFFIX='.obj'

    EXE_SUFFIX='.exe'

  else

    LIBRARY_PREFIX=lib

    SHARED_LIBRARY_SUFFIX='.so'

    STATIC_LIBRARY_SUFFIX='.a'

    SHARED_LIBRARY='lib[$]1.so'

    STATIC_LIBRARY='lib[$]1.a'

    OBJ_SUFFIX='.o'

    EXE_SUFFIX=''

    if test "x$OPENJDK_TARGET_OS" = xmacosx; then

      SHARED_LIBRARY='lib[$]1.dylib'

      SHARED_LIBRARY_SUFFIX='.dylib'

    fi

  fi

  AC_SUBST(LIBRARY_PREFIX)

  AC_SUBST(SHARED_LIBRARY_SUFFIX)

  AC_SUBST(STATIC_LIBRARY_SUFFIX)

  AC_SUBST(SHARED_LIBRARY)

  AC_SUBST(STATIC_LIBRARY)

  AC_SUBST(OBJ_SUFFIX)

  AC_SUBST(EXE_SUFFIX)

])

# Determine which toolchain type to use, and make sure it is valid for this

# platform. Setup various information about the selected toolchain.

AC_DEFUN_ONCE([TOOLCHAIN_DETERMINE_TOOLCHAIN_TYPE],

[

  AC_ARG_WITH(toolchain-type, [AS_HELP_STRING([--with-toolchain-type],

      [the toolchain type (or family) to use, use '--help' to show possible values @<:@platform dependent@:>@])])

  # Use indirect variable referencing

  toolchain_var_name=VALID_TOOLCHAINS_$OPENJDK_BUILD_OS

  VALID_TOOLCHAINS=${!toolchain_var_name}

  if test "x$OPENJDK_TARGET_OS" = xmacosx; then

    if test -n "$XCODEBUILD"; then

      # On Mac OS X, default toolchain to clang after Xcode 5

      XCODE_VERSION_OUTPUT=`"$XCODEBUILD" -version 2>&1 | $HEAD -n 1`

      $ECHO "$XCODE_VERSION_OUTPUT" | $GREP "Xcode " > /dev/null

      if test $? -ne 0; then

        AC_MSG_ERROR([Failed to determine Xcode version.])

      fi

      XCODE_MAJOR_VERSION=`$ECHO $XCODE_VERSION_OUTPUT | \

          $SED -e 's/^Xcode \(@<:@1-9@:>@@<:@0-9.@:>@*\)/\1/' | \

          $CUT -f 1 -d .`

      AC_MSG_NOTICE([Xcode major version: $XCODE_MAJOR_VERSION])

      if test $XCODE_MAJOR_VERSION -ge 5; then

          DEFAULT_TOOLCHAIN="clang"

      else

          DEFAULT_TOOLCHAIN="gcc"

      fi

    else

      # If Xcode is not installed, but the command line tools are

      # then we can't run xcodebuild. On these systems we should

      # default to clang

      DEFAULT_TOOLCHAIN="clang"

    fi

  else

    # First toolchain type in the list is the default

    DEFAULT_TOOLCHAIN=${VALID_TOOLCHAINS%% *}

  fi

  if test "x$with_toolchain_type" = xlist; then

    # List all toolchains

    AC_MSG_NOTICE([The following toolchains are valid on this platform:])

    for toolchain in $VALID_TOOLCHAINS; do

      toolchain_var_name=TOOLCHAIN_DESCRIPTION_$toolchain

      TOOLCHAIN_DESCRIPTION=${!toolchain_var_name}

      $PRINTF "  %-10s  %s\n" $toolchain "$TOOLCHAIN_DESCRIPTION"

    done

    exit 0

  elif test "x$with_toolchain_type" != x; then

    # User override; check that it is valid

    if test "x${VALID_TOOLCHAINS/$with_toolchain_type/}" = "x${VALID_TOOLCHAINS}"; then

      AC_MSG_NOTICE([Toolchain type $with_toolchain_type is not valid on this platform.])

      AC_MSG_NOTICE([Valid toolchains: $VALID_TOOLCHAINS.])

      AC_MSG_ERROR([Cannot continue.])

    fi

    TOOLCHAIN_TYPE=$with_toolchain_type

  else

    # No flag given, use default

    TOOLCHAIN_TYPE=$DEFAULT_TOOLCHAIN

  fi

  AC_SUBST(TOOLCHAIN_TYPE)

  TOOLCHAIN_CC_BINARY_clang="clang"

  TOOLCHAIN_CC_BINARY_gcc="gcc"

  TOOLCHAIN_CC_BINARY_microsoft="cl"

  TOOLCHAIN_CC_BINARY_solstudio="cc"

  TOOLCHAIN_CC_BINARY_xlc="xlc_r"

  TOOLCHAIN_CXX_BINARY_clang="clang++"

  TOOLCHAIN_CXX_BINARY_gcc="g++"

  TOOLCHAIN_CXX_BINARY_microsoft="cl"

  TOOLCHAIN_CXX_BINARY_solstudio="CC"

  TOOLCHAIN_CXX_BINARY_xlc="xlC_r"

  # Use indirect variable referencing

  toolchain_var_name=TOOLCHAIN_DESCRIPTION_$TOOLCHAIN_TYPE

  TOOLCHAIN_DESCRIPTION=${!toolchain_var_name}

  toolchain_var_name=TOOLCHAIN_CC_BINARY_$TOOLCHAIN_TYPE

  TOOLCHAIN_CC_BINARY=${!toolchain_var_name}

  toolchain_var_name=TOOLCHAIN_CXX_BINARY_$TOOLCHAIN_TYPE

  TOOLCHAIN_CXX_BINARY=${!toolchain_var_name}

  TOOLCHAIN_SETUP_FILENAME_PATTERNS

  if test "x$TOOLCHAIN_TYPE" = "x$DEFAULT_TOOLCHAIN"; then

    AC_MSG_NOTICE([Using default toolchain $TOOLCHAIN_TYPE ($TOOLCHAIN_DESCRIPTION)])

  else

    AC_MSG_NOTICE([Using user selected toolchain $TOOLCHAIN_TYPE ($TOOLCHAIN_DESCRIPTION). Default toolchain is $DEFAULT_TOOLCHAIN.])

  fi

])

# Before we start detecting the toolchain executables, we might need some

# special setup, e.g. additional paths etc.

AC_DEFUN_ONCE([TOOLCHAIN_PRE_DETECTION],

[

  # FIXME: Is this needed?

  AC_LANG(C++)

  # Store the CFLAGS etc passed to the configure script.

  ORG_CFLAGS="$CFLAGS"

  ORG_CXXFLAGS="$CXXFLAGS"

  # On Windows, we need to detect the visual studio installation first.

  # This will change the PATH, but we need to keep that new PATH even

  # after toolchain detection is done, since the compiler (on x86) uses

  # it for DLL resolution in runtime.

  if test "x$OPENJDK_BUILD_OS" = "xwindows" && test "x$TOOLCHAIN_TYPE" = "xmicrosoft"; then

    TOOLCHAIN_SETUP_VISUAL_STUDIO_ENV

    # Reset path to VS_PATH. It will include everything that was on PATH at the time we

    # ran TOOLCHAIN_SETUP_VISUAL_STUDIO_ENV.

    PATH="$VS_PATH"

    # The microsoft toolchain also requires INCLUDE and LIB to be set.

    export INCLUDE="$VS_INCLUDE"

    export LIB="$VS_LIB"

  fi

  # autoconf magic only relies on PATH, so update it if tools dir is specified

  OLD_PATH="$PATH"

  # For solaris we really need solaris tools, and not the GNU equivalent.

  # The build tools on Solaris reside in /usr/ccs (C Compilation System),

  # so add that to path before starting to probe.

  # FIXME: This was originally only done for AS,NM,GNM,STRIP,MCS,OBJCOPY,OBJDUMP.

  if test "x$OPENJDK_BUILD_OS" = xsolaris; then

    PATH="/usr/ccs/bin:$PATH"

  fi

  # Finally add TOOLCHAIN_PATH at the beginning, to allow --with-tools-dir to

  # override all other locations.

  if test "x$TOOLCHAIN_PATH" != x; then

    PATH=$TOOLCHAIN_PATH:$PATH

  fi

])

# Restore path, etc

AC_DEFUN_ONCE([TOOLCHAIN_POST_DETECTION],

[

  # Restore old path.

  PATH="$OLD_PATH"

  # Restore the flags to the user specified values.

  # This is necessary since AC_PROG_CC defaults CFLAGS to "-g -O2"

  CFLAGS="$ORG_CFLAGS"

  CXXFLAGS="$ORG_CXXFLAGS"

])

# Check if a compiler is of the toolchain type we expect, and save the version

# information from it. If the compiler does not match the expected type,

# this function will abort using AC_MSG_ERROR. If it matches, the version will

# be stored in CC_VERSION_NUMBER/CXX_VERSION_NUMBER (as a dotted number), and

# the full version string in CC_VERSION_STRING/CXX_VERSION_STRING.

#

# $1 = compiler to test (CC or CXX)

# $2 = human readable name of compiler (C or C++)

AC_DEFUN([TOOLCHAIN_CHECK_COMPILER_VERSION],

[

  COMPILER=[$]$1

  COMPILER_NAME=$2

  if test "x$TOOLCHAIN_TYPE" = xsolstudio; then

    # cc -V output typically looks like

    #     cc: Sun C 5.12 Linux_i386 2011/11/16

    COMPILER_VERSION_OUTPUT=`$COMPILER -V 2>&1`

    # Check that this is likely to be the Solaris Studio cc.

    $ECHO "$COMPILER_VERSION_OUTPUT" | $GREP "^.*: Sun $COMPILER_NAME" > /dev/null

    if test $? -ne 0; then

      ALT_VERSION_OUTPUT=`$COMPILER --version 2>&1`

      AC_MSG_NOTICE([The $COMPILER_NAME compiler (located as $COMPILER) does not seem to be the required $TOOLCHAIN_TYPE compiler.])

      AC_MSG_NOTICE([The result from running with -V was: "$COMPILER_VERSION_OUTPUT"])

      AC_MSG_NOTICE([The result from running with --version was: "$ALT_VERSION_OUTPUT"])

      AC_MSG_ERROR([A $TOOLCHAIN_TYPE compiler is required. Try setting --with-tools-dir.])

    fi

    # Remove usage instructions (if present), and

    # collapse compiler output into a single line

    COMPILER_VERSION_STRING=`$ECHO $COMPILER_VERSION_OUTPUT | \

        $SED -e 's/ *@<:@Uu@:>@sage:.*//'`

    COMPILER_VERSION_NUMBER=`$ECHO $COMPILER_VERSION_OUTPUT | \

        $SED -e "s/^.*@<:@ ,\t@:>@$COMPILER_NAME@<:@ ,\t@:>@\(@<:@1-9@:>@\.@<:@0-9@:>@@<:@0-9@:>@*\).*/\1/"`

  elif test  "x$TOOLCHAIN_TYPE" = xxlc; then

    # xlc -qversion output typically looks like

    #     IBM XL C/C++ for AIX, V11.1 (5724-X13)

    #     Version: 11.01.0000.0015

    COMPILER_VERSION_OUTPUT=`$COMPILER -qversion 2>&1`

    # Check that this is likely to be the IBM XL C compiler.

    $ECHO "$COMPILER_VERSION_OUTPUT" | $GREP "IBM XL C" > /dev/null

    if test $? -ne 0; then

      ALT_VERSION_OUTPUT=`$COMPILER --version 2>&1`

      AC_MSG_NOTICE([The $COMPILER_NAME compiler (located as $COMPILER) does not seem to be the required $TOOLCHAIN_TYPE compiler.])

      AC_MSG_NOTICE([The result from running with -qversion was: "$COMPILER_VERSION_OUTPUT"])

      AC_MSG_NOTICE([The result from running with --version was: "$ALT_VERSION_OUTPUT"])

      AC_MSG_ERROR([A $TOOLCHAIN_TYPE compiler is required. Try setting --with-tools-dir.])

    fi

    # Collapse compiler output into a single line

    COMPILER_VERSION_STRING=`$ECHO $COMPILER_VERSION_OUTPUT`

    COMPILER_VERSION_NUMBER=`$ECHO $COMPILER_VERSION_OUTPUT | \

        $SED -e 's/^.*, V\(@<:@1-9@:>@@<:@0-9.@:>@*\).*$/\1/'`

  elif test  "x$TOOLCHAIN_TYPE" = xmicrosoft; then

    # There is no specific version flag, but all output starts with a version string.

    # First line typically looks something like:

    # Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.40219.01 for 80x86

    COMPILER_VERSION_OUTPUT=`$COMPILER 2>&1 | $HEAD -n 1 | $TR -d '\r'`

    # Check that this is likely to be Microsoft CL.EXE.

    $ECHO "$COMPILER_VERSION_OUTPUT" | $GREP "Microsoft.*Compiler" > /dev/null

    if test $? -ne 0; then

      AC_MSG_NOTICE([The $COMPILER_NAME compiler (located as $COMPILER) does not seem to be the required $TOOLCHAIN_TYPE compiler.])

      AC_MSG_NOTICE([The result from running it was: "$COMPILER_VERSION_OUTPUT"])

      AC_MSG_ERROR([A $TOOLCHAIN_TYPE compiler is required. Try setting --with-tools-dir.])

    fi

    # Collapse compiler output into a single line

    COMPILER_VERSION_STRING=`$ECHO $COMPILER_VERSION_OUTPUT`

    COMPILER_VERSION_NUMBER=`$ECHO $COMPILER_VERSION_OUTPUT | \

        $SED -e 's/^.*ersion.\(@<:@1-9@:>@@<:@0-9.@:>@*\) .*$/\1/'`

  elif test  "x$TOOLCHAIN_TYPE" = xgcc; then

    # gcc --version output typically looks like

    #     gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1

    #     Copyright (C) 2013 Free Software Foundation, Inc.

    #     This is free software; see the source for copying conditions.  There is NO

    #     warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    COMPILER_VERSION_OUTPUT=`$COMPILER --version 2>&1`

    # Check that this is likely to be GCC.

    $ECHO "$COMPILER_VERSION_OUTPUT" | $GREP "Free Software Foundation" > /dev/null

    if test $? -ne 0; then

      AC_MSG_NOTICE([The $COMPILER_NAME compiler (located as $COMPILER) does not seem to be the required $TOOLCHAIN_TYPE compiler.])

      AC_MSG_NOTICE([The result from running with --version was: "$COMPILER_VERSION"])

      AC_MSG_ERROR([A $TOOLCHAIN_TYPE compiler is required. Try setting --with-tools-dir.])

    fi

    # Remove Copyright and legalese from version string, and

    # collapse into a single line

    COMPILER_VERSION_STRING=`$ECHO $COMPILER_VERSION_OUTPUT | \

        $SED -e 's/ *Copyright .*//'`

    COMPILER_VERSION_NUMBER=`$ECHO $COMPILER_VERSION_OUTPUT | \

        $SED -e 's/^.* \(@<:@1-9@:>@\.@<:@0-9.@:>@*\) .*$/\1/'`

  elif test  "x$TOOLCHAIN_TYPE" = xclang; then

    # clang --version output typically looks like

    #    Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)

    #    clang version 3.3 (tags/RELEASE_33/final)

    # or

    #    Debian clang version 3.2-7ubuntu1 (tags/RELEASE_32/final) (based on LLVM 3.2)

    #    Target: x86_64-pc-linux-gnu

    #    Thread model: posix

    COMPILER_VERSION_OUTPUT=`$COMPILER --version 2>&1`

    # Check that this is likely to be clang

    $ECHO "$COMPILER_VERSION_OUTPUT" | $GREP "clang" > /dev/null

    if test $? -ne 0; then

      AC_MSG_NOTICE([The $COMPILER_NAME compiler (located as $COMPILER) does not seem to be the required $TOOLCHAIN_TYPE compiler.])

      AC_MSG_NOTICE([The result from running with --version was: "$COMPILER_VERSION_OUTPUT"])

      AC_MSG_ERROR([A $TOOLCHAIN_TYPE compiler is required. Try setting --with-tools-dir.])

    fi

    # Collapse compiler output into a single line

    COMPILER_VERSION_STRING=`$ECHO $COMPILER_VERSION_OUTPUT`

    COMPILER_VERSION_NUMBER=`$ECHO $COMPILER_VERSION_OUTPUT | \

        $SED -e 's/^.*clang version \(@<:@1-9@:>@@<:@0-9.@:>@*\).*$/\1/'`

  else

      AC_MSG_ERROR([Unknown toolchain type $TOOLCHAIN_TYPE.])

  fi

  # This sets CC_VERSION_NUMBER or CXX_VERSION_NUMBER. (This comment is a grep marker)

  $1_VERSION_NUMBER="$COMPILER_VERSION_NUMBER"

  # This sets CC_VERSION_STRING or CXX_VERSION_STRING. (This comment is a grep marker)

  $1_VERSION_STRING="$COMPILER_VERSION_STRING"

  AC_MSG_NOTICE([Using $TOOLCHAIN_TYPE $COMPILER_NAME compiler version $COMPILER_VERSION_NUMBER @<:@$COMPILER_VERSION_STRING@:>@])

])

# Try to locate the given C or C++ compiler in the path, or otherwise.

#

# $1 = compiler to test (CC or CXX)

# $2 = human readable name of compiler (C or C++)

# $3 = list of compiler names to search for

AC_DEFUN([TOOLCHAIN_FIND_COMPILER],

[

  COMPILER_NAME=$2

  SEARCH_LIST="$3"

  if test "x[$]$1" != x; then

    # User has supplied compiler name already, always let that override.

    AC_MSG_NOTICE([Will use user supplied compiler $1=[$]$1])

    if test "x`basename [$]$1`" = "x[$]$1"; then

      # A command without a complete path is provided, search $PATH.

      AC_PATH_PROGS(POTENTIAL_$1, [$]$1)

      if test "x$POTENTIAL_$1" != x; then

        $1=$POTENTIAL_$1

      else

        AC_MSG_ERROR([User supplied compiler $1=[$]$1 could not be found])

      fi

    else

      # Otherwise it might already be a complete path

      if test ! -x "[$]$1"; then

        AC_MSG_ERROR([User supplied compiler $1=[$]$1 does not exist])

      fi

    fi

  else

    # No user supplied value. Locate compiler ourselves.

    # If we are cross compiling, assume cross compilation tools follows the

    # cross compilation standard where they are prefixed with the autoconf

    # standard name for the target. For example the binary

    # i686-sun-solaris2.10-gcc will cross compile for i686-sun-solaris2.10.

    # If we are not cross compiling, then the default compiler name will be

    # used.

    $1=

    # If TOOLCHAIN_PATH is set, check for all compiler names in there first

    # before checking the rest of the PATH.

    # FIXME: Now that we prefix the TOOLS_DIR to the PATH in the PRE_DETECTION

    # step, this should not be necessary.

    if test -n "$TOOLCHAIN_PATH"; then

      PATH_save="$PATH"

      PATH="$TOOLCHAIN_PATH"

      AC_PATH_PROGS(TOOLCHAIN_PATH_$1, $SEARCH_LIST)

      $1=$TOOLCHAIN_PATH_$1

      PATH="$PATH_save"

    fi

    # AC_PATH_PROGS can't be run multiple times with the same variable,

    # so create a new name for this run.

    if test "x[$]$1" = x; then

      AC_PATH_PROGS(POTENTIAL_$1, $SEARCH_LIST)

      $1=$POTENTIAL_$1

    fi

    if test "x[$]$1" = x; then

      HELP_MSG_MISSING_DEPENDENCY([devkit])

      AC_MSG_ERROR([Could not find a $COMPILER_NAME compiler. $HELP_MSG])

    fi

  fi

  # Now we have a compiler binary in $1. Make sure it's okay.

  BASIC_FIXUP_EXECUTABLE($1)

  TEST_COMPILER="[$]$1"

  # Don't remove symbolic links on AIX because 'xlc_r' and 'xlC_r' may all be links

  # to 'xlc' but it is crucial that we invoke the compiler with the right name!

  if test "x$OPENJDK_BUILD_OS" != xaix; then

    # FIXME: This test should not be needed anymore; we don't do that for any platform.

    AC_MSG_CHECKING([resolved symbolic links for $1])

    BASIC_REMOVE_SYMBOLIC_LINKS(TEST_COMPILER)

    AC_MSG_RESULT([$TEST_COMPILER])

  fi

  AC_MSG_CHECKING([if $1 is disguised ccache])

  COMPILER_BASENAME=`$BASENAME "$TEST_COMPILER"`

  if test "x$COMPILER_BASENAME" = "xccache"; then

    AC_MSG_RESULT([yes, trying to find proper $COMPILER_NAME compiler])

    # We /usr/lib/ccache in the path, so cc is a symlink to /usr/bin/ccache.

    # We want to control ccache invocation ourselves, so ignore this cc and try

    # searching again.

    # Remove the path to the fake ccache cc from the PATH

    RETRY_COMPILER_SAVED_PATH="$PATH"

    COMPILER_DIRNAME=`$DIRNAME [$]$1`

    PATH="`$ECHO $PATH | $SED -e "s,$COMPILER_DIRNAME,,g" -e "s,::,:,g" -e "s,^:,,g"`"

    # Try again looking for our compiler

    AC_CHECK_TOOLS(PROPER_COMPILER_$1, $3)

    BASIC_FIXUP_EXECUTABLE(PROPER_COMPILER_$1)

    PATH="$RETRY_COMPILER_SAVED_PATH"

    AC_MSG_CHECKING([for resolved symbolic links for $1])

    BASIC_REMOVE_SYMBOLIC_LINKS(PROPER_COMPILER_$1)

    AC_MSG_RESULT([$PROPER_COMPILER_$1])

    $1="$PROPER_COMPILER_$1"

  else

    AC_MSG_RESULT([no, keeping $1])

  fi

  TOOLCHAIN_CHECK_COMPILER_VERSION([$1], [$COMPILER_NAME])

])

# Detect the core components of the toolchain, i.e. the compilers (CC and CXX),

# preprocessor (CPP and CXXCPP), the linker (LD), the assembler (AS) and the

# archiver (AR). Verify that the compilers are correct according to the

# toolchain type.

AC_DEFUN_ONCE([TOOLCHAIN_DETECT_TOOLCHAIN_CORE],

[

  #

  # Setup the compilers (CC and CXX)

  #

  TOOLCHAIN_FIND_COMPILER([CC], [C], $TOOLCHAIN_CC_BINARY)

  # Now that we have resolved CC ourself, let autoconf have its go at it

  AC_PROG_CC([$CC])

  TOOLCHAIN_FIND_COMPILER([CXX], [C++], $TOOLCHAIN_CXX_BINARY)

  # Now that we have resolved CXX ourself, let autoconf have its go at it

  AC_PROG_CXX([$CXX])

  #

  # Setup the preprocessor (CPP and CXXCPP)

  #

  AC_PROG_CPP

  BASIC_FIXUP_EXECUTABLE(CPP)

  AC_PROG_CXXCPP

  BASIC_FIXUP_EXECUTABLE(CXXCPP)

  #

  # Setup the linker (LD)

  #

  if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then

    # In the Microsoft toolchain we have a separate LD command "link".

    # Make sure we reject /usr/bin/link (as determined in CYGWIN_LINK), which is

    # a cygwin program for something completely different.

    AC_CHECK_PROG([LD], [link],[link],,, [$CYGWIN_LINK])

    BASIC_FIXUP_EXECUTABLE(LD)