dnl
dnl Binary distribution configure script
dnl
#!/bin/sh
#

AC_INIT([The Glorious Glasgow Haskell Compilation System], [@ProjectVersion@], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])

dnl See /configure.ac for rationale.
AC_PREREQ([2.69])

AC_CONFIG_MACRO_DIRS([../m4])

dnl--------------------------------------------------------------------
dnl * Deal with arguments telling us gmp is somewhere odd
dnl--------------------------------------------------------------------

FP_GMP

dnl Various things from the source distribution configure
bootstrap_target=@TargetPlatform@

TargetHasRTSLinker=@TargetHasRTSLinker@
AC_SUBST(TargetHasRTSLinker)

FFIIncludeDir=@FFIIncludeDir@
FFILibDir=@FFILibDir@
AC_SUBST(FFILibDir)
AC_SUBST(FFIIncludeDir)

LibdwIncludeDir=@LibdwIncludeDir@
LibdwLibDir=@LibdwLibDir@
AC_SUBST(LibdwLibDir)
AC_SUBST(LibdwIncludeDir)

UseLibffiForAdjustors=@UseLibffiForAdjustors@
AC_SUBST(UseLibffiForAdjustors)

# We have to run these unconditionally as FPTOOLS_SET_PLATFORM_VARS wants the
# values it computes.
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

FPTOOLS_SET_PLATFORM_VARS

# Requires FPTOOLS_SET_PLATFORM_VARS to be run first.
FP_FIND_ROOT

# ToDo: if Stage1Only=YES, should be YES
CrossCompiling=NO
CrossCompilePrefix="@CrossCompilePrefix@"
TargetPlatformFull="${target}"
TablesNextToCode="@TablesNextToCode@"

AC_SUBST(CrossCompiling)
AC_SUBST(CrossCompilePrefix)
AC_SUBST(TargetPlatformFull)
AC_SUBST(TablesNextToCode)

Unregisterised="@Unregisterised@"
AC_SUBST(Unregisterised)

#
dnl ** figure out how to do a BSD-ish install **
#
AC_PROG_INSTALL

#
dnl ** how to do symlinks **
#
AC_PROG_LN_S()

#
dnl ** Find the path to sed **
#
AC_PATH_PROG(SedCmd,gsed sed,sed)

dnl ** check for Python for testsuite driver
FIND_PYTHON

XCODE_VERSION()

dnl ** Which gcc to use?
dnl --------------------------------------------------------------
AC_PROG_CC([gcc clang])

dnl ** figure out how to invoke the C preprocessor (i.e. `gcc -E`)
AC_PROG_CPP

# --with-hs-cpp/--with-hs-cpp-flags
FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
AC_SUBST([HaskellCPPCmd])
AC_SUBST([HaskellCPPArgs])

FP_SET_CFLAGS_C99([CC],[CFLAGS],[CPPFLAGS])
dnl FP_SET_CFLAGS_C99([CC_STAGE0],[CONF_CC_OPTS_STAGE0],[CONF_CPP_OPTS_STAGE0])
FP_SET_CFLAGS_C99([CC],[CONF_CC_OPTS_STAGE1],[CONF_CPP_OPTS_STAGE1])
FP_SET_CFLAGS_C99([CC],[CONF_CC_OPTS_STAGE2],[CONF_CPP_OPTS_STAGE2])

dnl ** Which ld to use?
dnl --------------------------------------------------------------
FIND_LD([$target],[GccUseLdOpt])
FIND_MERGE_OBJECTS()
CONF_GCC_LINKER_OPTS_STAGE1="$CONF_GCC_LINKER_OPTS_STAGE1 $GccUseLdOpt"
CONF_GCC_LINKER_OPTS_STAGE2="$CONF_GCC_LINKER_OPTS_STAGE2 $GccUseLdOpt"
LdCmd="$LD"
CFLAGS="$CFLAGS $GccUseLdOpt"
AC_SUBST([LdCmd])

FP_PROG_LD_IS_GNU
FP_PROG_LD_BUILD_ID
FP_PROG_LD_NO_COMPACT_UNWIND
FP_PROG_LD_FILELIST

dnl ** which strip to use?
dnl --------------------------------------------------------------
AC_CHECK_TARGET_TOOL([STRIP], [strip])
StripCmd="$STRIP"
AC_SUBST([StripCmd])

# Here is where we re-target which specific version of the LLVM
# tools we are looking for. In the past, GHC supported a number of
# versions of LLVM simultaneously, but that stopped working around
# 3.5/3.6 release of LLVM.
LlvmMinVersion=@LlvmMinVersion@
LlvmMaxVersion=@LlvmMaxVersion@

dnl ** Which LLVM llc to use?
dnl --------------------------------------------------------------
AC_ARG_VAR(LLC,[Use as the path to LLVM's llc [default=autodetect]])
FIND_LLVM_PROG([LLC], [llc], [$LlvmMinVersion], [$LlvmMaxVersion])
LlcCmd="$LLC"
AC_SUBST([LlcCmd])

dnl ** Which LLVM opt to use?
dnl --------------------------------------------------------------
AC_ARG_VAR(OPT,[Use as the path to LLVM's opt [default=autodetect]])
FIND_LLVM_PROG([OPT], [opt], [$LlvmMinVersion], [$LlvmMaxVersion])
OptCmd="$OPT"
AC_SUBST([OptCmd])

dnl ** Check gcc version and flags we need to pass it **
FP_GCC_VERSION
FP_GCC_SUPPORTS_NO_PIE
FP_GCC_EXTRA_FLAGS

FPTOOLS_SET_C_LD_FLAGS([target],[CFLAGS],[LDFLAGS],[IGNORE_LINKER_LD_FLAGS],[CPPFLAGS])
FPTOOLS_SET_C_LD_FLAGS([build],[CONF_CC_OPTS_STAGE0],[CONF_GCC_LINKER_OPTS_STAGE0],[CONF_LD_LINKER_OPTS_STAGE0],[CONF_CPP_OPTS_STAGE0])
FPTOOLS_SET_C_LD_FLAGS([target],[CONF_CC_OPTS_STAGE1],[CONF_GCC_LINKER_OPTS_STAGE1],[CONF_LD_LINKER_OPTS_STAGE1],[CONF_CPP_OPTS_STAGE1])
# Stage 3 won't be supported by cross-compilation
FPTOOLS_SET_C_LD_FLAGS([target],[CONF_CC_OPTS_STAGE2],[CONF_GCC_LINKER_OPTS_STAGE2],[CONF_LD_LINKER_OPTS_STAGE2],[CONF_CPP_OPTS_STAGE2])

AC_SUBST(CONF_CC_OPTS_STAGE0)
AC_SUBST(CONF_CC_OPTS_STAGE1)
AC_SUBST(CONF_CC_OPTS_STAGE2)
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE0)
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE1)
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE2)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE0)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE1)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE2)
AC_SUBST(CONF_CPP_OPTS_STAGE0)
AC_SUBST(CONF_CPP_OPTS_STAGE1)
AC_SUBST(CONF_CPP_OPTS_STAGE2)

dnl ** Set up the variables for the platform in the settings file.
dnl May need to use gcc to find platform details.
dnl --------------------------------------------------------------
FPTOOLS_SET_HASKELL_PLATFORM_VARS

dnl ** See whether cc supports --target=<triple> and set
dnl CONF_CC_OPTS_STAGE[12] accordingly.
FP_CC_SUPPORTS_TARGET

dnl TargetWordSize for settings file
AC_CHECK_SIZEOF(void *, 4)
if test "x$ac_cv_sizeof_void_p" = "x0"; then
    AC_MSG_ERROR([Failed to determine machine word size. Does your toolchain actually work?])
fi
dnl Check that the toolchain we have is consistent with what the compiler expects
if test "x$ac_cv_sizeof_void_p" != "x@TargetWordSize@"; then
    AC_MSG_ERROR([This binary distribution produces binaries for a target with
                  word size of @TargetWordSize@, but your target toolchain produces binaries
                  with a word size of $ac_cv_sizeof_void_p. Are you sure your toolchain
                  targets the intended target platform of this compiler?])
fi
TargetWordSize=$ac_cv_sizeof_void_p
AC_SUBST(TargetWordSize)

dnl TargetWordBigEndian for settings file
AC_C_BIGENDIAN([TargetWordBigEndian=YES],[TargetWordBigEndian=NO])
dnl Check that the toolchain we have is consistent with what the compiler expects
if test "x$TargetWordBigEndian" != "x@TargetWordBigEndian@"; then
    AC_MSG_ERROR([This binary distribution produces binaries for a target with
                  a different byte order than your target toolchain.
                  Are you sure your toolchain targets the intended target platform
                  of this compiler?])
fi
AC_SUBST(TargetWordBigEndian)

#
dnl ** how to invoke `ar' and `ranlib'
#
FP_PROG_AR_SUPPORTS_ATFILE
FP_PROG_AR_NEEDS_RANLIB
RanlibCmd="$RANLIB"
AC_SUBST([RanlibCmd])

dnl ** Have libdw?
dnl --------------------------------------------------------------
dnl Check for a usable version of libdw/elfutils
dnl Currently we need 0.158 or newer.
UseLibdw=@UseLibdw@
if test "x$UseLibdw" = "xYES" ; then
  AC_CHECK_LIB(dw, dwfl_attach_state,
    [UseLibdw=YES],
    [AC_MSG_ERROR([Binary distribution was built with libdw support but target system doesn't have supported libdw version (needs at least 0.158)])]
  )
fi
AC_SUBST(UseLibdw)

FP_SETTINGS

#
AC_CONFIG_FILES(mk/config.mk mk/install.mk)
AC_OUTPUT

# We get caught by
#     http://savannah.gnu.org/bugs/index.php?1516
#     $(eval ...) inside conditionals causes errors
# with make 3.80, so warn the user if it looks like they're about to
# try to use it.
# We would use "grep -q" here, but Solaris's grep doesn't support it.
checkMake380() {
    if $1 --version 2>&1 | head -1 | grep 'GNU Make 3\.80' > /dev/null
    then
        echo
        echo "WARNING: It looks like \"$1\" is GNU make 3.80."
        echo "This version cannot be used to build GHC."
        echo "Please use GNU make >= 3.81."
    fi
}

checkMake380 make
checkMake380 gmake

echo "****************************************************"
echo "Configuration done, ready to 'make install'"
echo "(see README and INSTALL files for more info.)"
echo "****************************************************"