utils/buildit/build_llvm - platform/external/llvm - Gitiles

 #!/bin/sh
 # LLVM LOCAL file B&I

 set -x

 # Build LLVM the "Apple way".
 # Parameters:

 # The first parameter is a space-separated list of the architectures the
 # compilers will run on. For instance, "ppc i386". If the current machine
 # isn't in the list, it will (effectively) be added.
 HOSTS="$1"

 # The second parameter is a space-separated list of the architectures the
 # compilers will generate code for. If the current machine isn't in the list, a
 # compiler for it will get built anyway, but won't be installed.
 # FIXME: The list of targets is currently hard-coded and TARGETS is not used.
 TARGETS="$2"

 # The third parameter is the path to the compiler sources. There should be a
 # shell script named 'configure' in this directory. This script makes a copy...
 ORIG_SRC_DIR="$3"

 # The fourth parameter is the location where the LLVM will be installed. You can
 # move it once it's built, so this mostly controls the layout of $DEST_DIR.
 DEST_ROOT="$4"

 # The fifth parameter is the place where the compiler will be copied once it's
 # built.
 DEST_DIR="$5"

 # The sixth parameter is a directory in which to place information (like
 # unstripped executables and generated source files) helpful in debugging the
 # resulting compiler.
 SYM_DIR="$6"

 # The seventh parameter is a yes/no that indicates whether assertions should be
 # enabled in the LLVM libs/tools.
 LLVM_ASSERTIONS="$7"

 # The eighth parameter is a yes/no that indicates whether this is an optimized
 # build.
 LLVM_OPTIMIZED="$8"

 # The ninth parameter is a yes/no that indicates whether libLTO.dylib
 # should be installed.
 INSTALL_LIBLTO="$9"

 # A yes/no parameter that controls whether to cross-build for an ARM host.
 ARM_HOSTED_BUILD="${10}"

 # A yes/no parameter that controls whether to cross-build for the iOS simulator
 IOS_SIM_BUILD="${11}"

 # The version number of the submission, e.g. 1007.
 LLVM_SUBMIT_VERSION="${12}"

 # The subversion number of the submission, e.g. 03.
 LLVM_SUBMIT_SUBVERSION="${13}"

 # The current working directory is where the build will happen. It may already
 # contain a partial result of an interrupted build, in which case this script
 # will continue where it left off.
 DIR=`pwd`

 DARWIN_VERS=`uname -r | sed 's/\..*//'`
 echo DARWIN_VERS = $DARWIN_VERS

 ################################################################################
 # Run the build.

 # Create the source tree we'll actually use to build, deleting
 # tcl since it doesn't actually build properly in a cross environment
 # and we don't really need it.
 SRC_DIR=$DIR/src
 rm -rf $SRC_DIR || exit 1
 mkdir $SRC_DIR || exit 1
 ln -s $ORIG_SRC_DIR/* $SRC_DIR/ || exit 1
 # We can't use the top-level Makefile as-is.  Remove the soft link:
 rm $SRC_DIR/Makefile || exit 1
 # Now create our own by editing the top-level Makefile, deleting every line marked "Apple-style":
 sed -e '/[Aa]pple-style/d' -e '/include.*GNUmakefile/d' $ORIG_SRC_DIR/Makefile > $SRC_DIR/Makefile || exit 1

 # Build the LLVM tree universal.
 mkdir -p $DIR/obj-llvm || exit 1
 cd $DIR/obj-llvm || exit 1

 if [ "$ARM_HOSTED_BUILD" = yes ]; then
   # The cross-tools' build process expects to find an existing cross toolchain
   # under names like 'arm-apple-darwin$DARWIN_VERS-as'; so make them.
   rm -rf $DIR/bin || exit 1
   mkdir $DIR/bin || exit 1
   for prog in ar nm ranlib strip lipo ld as ; do
     P=$DIR/bin/arm-apple-darwin$DARWIN_VERS-${prog}
     T=`xcrun -sdk $SDKROOT -find ${prog}`
     echo '#!/bin/sh' > $P || exit 1
     echo 'exec '$T' "$@"' >> $P || exit 1
     chmod a+x $P || exit 1
   done
   # Try to use the platform llvm-gcc. Fall back to gcc if it's not available.
   for prog in gcc g++ ; do
     P=$DIR/bin/arm-apple-darwin$DARWIN_VERS-${prog}
     T=`xcrun -sdk $SDKROOT -find llvm-${prog}`
     if [ "x$T" = "x" ] ; then
       T=`xcrun -sdk $SDKROOT -find ${prog}`
     fi
     echo '#!/bin/sh' > $P || exit 1
     echo 'exec '$T' -arch armv7 -isysroot '${SDKROOT}' "$@"' >> $P || exit 1
     chmod a+x $P || exit 1
   done

   PATH=$DIR/bin:$PATH
 # otherwise, try to use llvm-gcc if it's available
 elif [ $DARWIN_VERS -gt 9 ]; then
   # If the user has set CC or CXX, respect their wishes.  If not,
   # compile with LLVM-GCC/LLVM-G++ if available; if LLVM is not
   # available, fall back to usual GCC/G++ default.
   savedPATH=$PATH ; PATH="/Developer/usr/bin:$PATH"
   XTMPCC=$(which llvm-gcc)
   if [ x$CC  = x -a x$XTMPCC != x ] ; then export CC=$XTMPCC  ; fi
   XTMPCC=$(which llvm-g++)
   if [ x$CXX = x -a x$XTMPCC != x ] ; then export CXX=$XTMPCC ; fi
   PATH=$savedPATH
   unset XTMPCC savedPATH
 fi

 if [ "$ARM_HOSTED_BUILD" = yes ]; then
   configure_opts="--enable-targets=arm --host=arm-apple-darwin10 \
                   --target=arm-apple-darwin10 --build=i686-apple-darwin10"
 elif [ "$IOS_SIM_BUILD" = yes ]; then
   # Use a non-standard "darwin_sim" host triple to trigger a cross-build.
   configure_opts="--enable-targets=x86 --host=i686-apple-darwin_sim \
                   --build=i686-apple-darwin10"
 else
   configure_opts="--enable-targets=arm,x86,cbe"
 fi

 if [ \! -f Makefile.config ]; then
   $SRC_DIR/configure --prefix=$DEST_DIR$DEST_ROOT $configure_opts \
     --enable-assertions=$LLVM_ASSERTIONS \
     --enable-optimized=$LLVM_OPTIMIZED \
     --disable-bindings \
     || exit 1
 fi

 SUBVERSION=`echo $RC_ProjectSourceVersion | sed -e 's/[^.]*\.\([0-9]*\).*/\1/'`

 if [ "x$SUBVERSION" != "x$RC_ProjectSourceVersion" ]; then
     LLVM_SUBMIT_SUBVERSION=`printf "%02d" $SUBVERSION`
     RC_ProjectSourceVersion=`echo $RC_ProjectSourceVersion | sed -e 's/\..*//'`
     LLVM_SUBMIT_VERSION=$RC_ProjectSourceVersion
 fi

 if [ "x$LLVM_SUBMIT_SUBVERSION" = "x00" -o "x$LLVM_SUBMIT_SUBVERSION" = "x0" ]; then
     LLVM_VERSION="$LLVM_SUBMIT_VERSION"
 else
     LLVM_VERSION="$LLVM_SUBMIT_VERSION-$LLVM_SUBMIT_SUBVERSION"
 fi

 GCC_VER=`cc --version 2>/dev/null | sed 1q`

 if echo "$GCC_VER" | grep GCC > /dev/null; then
     GCC_VER=`echo $GCC_VER | sed -e 's/.*(GCC) \([0-9.][0-9.]*\).*/\1/'`
     MAJ_VER=`echo $GCC_VER | sed 's/\..*//'`
     MIN_VER=`echo $GCC_VER | sed 's/[^.]*\.\([0-9]*\).*/\1/'`
 fi

 JOBS_FLAG=""

 # Note: If compiling with GCC 4.0, don't pass the -jN flag. Building universal
 # already has parallelism and we don't want to make the builders hit swap by
 # firing off too many gccs at the same time.
 if [ "x$MAJ_VER" != "x4" -o "x$MIN_VER" != "x0" ]; then
     # Figure out how many make processes to run.
     SYSCTL=`sysctl -n hw.activecpu`

     # sysctl -n hw.* does not work when invoked via B&I chroot /BuildRoot.
     # Builders can default to 2, since even if they are single processor,
     # nothing else is running on the machine.
     if [ -z "$SYSCTL" ]; then
         SYSCTL=2
     fi

     JOBS_FLAG="-j $SYSCTL"
 fi

 make $JOBS_FLAG $OPTIMIZE_OPTS UNIVERSAL=1 UNIVERSAL_ARCH="$HOSTS" \
     UNIVERSAL_SDK_PATH=$SDKROOT \
     NO_RUNTIME_LIBS=1 \
     DISABLE_EDIS=1 \
     DEBUG_SYMBOLS=1 \
     LLVM_SUBMIT_VERSION=$LLVM_SUBMIT_VERSION \
     LLVM_SUBMIT_SUBVERSION=$LLVM_SUBMIT_SUBVERSION \
     CXXFLAGS="-DLLVM_VERSION_INFO='\" Apple Build #$LLVM_VERSION\"'" \
     VERBOSE=1

 if [ $? != 0 ] ; then
     echo "error: LLVM 'make' failed!"
     exit 1
 fi

 ################################################################################
 # Construct the actual destination root, by copying stuff from $DIR/dst-* to
 # $DEST_DIR, with occasional 'lipo' commands.

 cd $DEST_DIR || exit 1

 # Clean out DEST_DIR in case -noclean was passed to buildit.
 rm -rf * || exit 1

 cd $DIR/obj-llvm || exit 1

 # Install the tree into the destination directory.
 make $LOCAL_MAKEFLAGS $OPTIMIZE_OPTS UNIVERSAL=1 UNIVERSAL_ARCH="$HOSTS" \
     NO_RUNTIME_LIBS=1 \
     DISABLE_EDIS=1 \
     DEBUG_SYMBOLS=1 \
     LLVM_SUBMIT_VERSION=$LLVM_SUBMIT_VERSION \
     LLVM_SUBMIT_SUBVERSION=$LLVM_SUBMIT_SUBVERSION \
     OPTIMIZE_OPTION='-O3' VERBOSE=1 install

 if ! test $? == 0 ; then
     echo "error: LLVM 'make install' failed!"
     exit 1
 fi

 # Install Version.h
 LLVM_MINOR_VERSION=`echo $LLVM_SUBMIT_SUBVERSION | sed -e 's,0*\([1-9][0-9]*\),\1,'`
 if [ "x$LLVM_MINOR_VERSION" = "x" ]; then
     LLVM_MINOR_VERSION=0
 fi
 RC_ProjectSourceSubversion=`printf "%d" $LLVM_MINOR_VERSION`
 echo "#define LLVM_VERSION ${RC_ProjectSourceVersion}" > $DEST_DIR$DEST_ROOT/include/llvm/Version.h
 echo "#define LLVM_MINOR_VERSION ${RC_ProjectSourceSubversion}" >> $DEST_DIR$DEST_ROOT/include/llvm/Version.h

 if [ "x$LLVM_DEBUG" != "x1" ]; then
     # Strip local symbols from llvm libraries.
     #
     # Use '-l' to strip i386 modules. N.B. that flag doesn't work with kext or
     # PPC objects!
     strip -Sl $DEST_DIR$DEST_ROOT/lib/*.[oa]
     for f in `ls $DEST_DIR$DEST_ROOT/lib/*.so`; do
         strip -Sxl $f
     done
 fi

 # Copy over the tblgen utility.
 cp `find $DIR -name tblgen` $DEST_DIR$DEST_ROOT/bin

 # Remove .dir files
 cd $DEST_DIR$DEST_ROOT
 rm -f bin/.dir etc/llvm/.dir lib/.dir

 # Remove PPC64 fat slices.
 cd $DEST_DIR$DEST_ROOT/bin
 if [ $MACOSX_DEPLOYMENT_TARGET = "10.4" ]; then
     find . -perm 755 -type f \! \( -name '*gccas' -o -name '*gccld' -o -name llvm-config \) \
         -exec lipo -extract ppc -extract i386 {} -output {} \;
 elif [ $MACOSX_DEPLOYMENT_TARGET = "10.5" ]; then
     find . -perm 755 -type f \! \( -name '*gccas' -o -name '*gccld' -o -name llvm-config \) \
         -exec lipo -extract ppc7400 -extract i386 {} -output {} \;
 else
     find . -perm 755 -type f \! \( -name '*gccas' -o -name '*gccld' -o -name llvm-config \) \
         -exec lipo -extract i386 -extract x86_64 {} -output {} \;
 fi

 # The Hello dylib is an example of how to build a pass.
 # The BugpointPasses module is only used to test bugpoint.
 # These unversioned dylibs cause verification failures, so do not install them.
 # (The wildcards are used to match a "lib" prefix if it is present.)
 rm $DEST_DIR$DEST_ROOT/lib/*LLVMHello.dylib
 rm $DEST_DIR$DEST_ROOT/lib/*BugpointPasses.dylib

 # Compress manpages
 MDIR=$DEST_DIR$DEST_ROOT/share/man/man1
 gzip -f $MDIR/*

 ################################################################################
 # Create SYM_DIR with information required for debugging.

 # Figure out how many make processes to run.
 SYSCTL=`sysctl -n hw.activecpu`

 # hw.activecpu only available in 10.2.6 and later
 if [ -z "$SYSCTL" ]; then
   SYSCTL=`sysctl -n hw.ncpu`
 fi

 # sysctl -n hw.* does not work when invoked via B&I chroot /BuildRoot. Builders
 # can default to 2, since even if they are single processor, nothing else is
 # running on the machine.
 if [ -z "$SYSCTL" ]; then
   SYSCTL=2
 fi

 cd $SYM_DIR || exit 1

 # Clean out SYM_DIR in case -noclean was passed to buildit.
 rm -rf * || exit 1

 # Generate .dSYM files
 find $DEST_DIR -perm -0111 -type f \
     ! \( -name '*.la' -o -name gccas -o -name gccld -o -name llvm-config -o -name '*.a' \) \
     -print | xargs -n 1 -P ${SYSCTL} dsymutil

 # Save .dSYM files and .a archives
 cd $DEST_DIR || exit 1
 find . \( -path \*.dSYM/\* -or -name \*.a \) -print \
     | cpio -pdml $SYM_DIR || exit 1

 # Save source files.
 mkdir $SYM_DIR/src || exit 1
 cd $DIR || exit 1
 find obj-* -name \*.\[chy\] -o -name \*.cpp -print \
     | cpio -pdml $SYM_DIR/src || exit 1

 ################################################################################
 # Install and strip libLTO.dylib

 cd $DEST_DIR$DEST_ROOT
 if [ "$INSTALL_LIBLTO" = "yes" ]; then
   DT_HOME="$DEST_DIR/Developer/usr"
   mkdir -p $DT_HOME/lib
   mv lib/libLTO.dylib $DT_HOME/lib/libLTO.dylib

   # Save a copy of the unstripped dylib
   mkdir -p $SYM_DIR/Developer/usr/lib
   cp $DT_HOME/lib/libLTO.dylib $SYM_DIR/Developer/usr/lib/libLTO.dylib

   # Use '-l' to strip i386 modules. N.B. that flag doesn't work with kext or
   # PPC objects!
   strip -arch all -Sl $DT_HOME/lib/libLTO.dylib

   if [ "x$DISABLE_USR_LINKS" == "x" ]; then
     # Add a symlink in /usr/lib for B&I.
     mkdir -p $DEST_DIR/usr/lib/
     (cd $DEST_DIR/usr/lib && \
       ln -s ../../Developer/usr/lib/libLTO.dylib ./libLTO.dylib)
   fi
 else
   rm -f lib/libLTO.dylib
 fi
 rm -f lib/libLTO.a lib/libLTO.la

 # Omit lto.h from the result.  Clang will supply.
 find $DEST_DIR$DEST_ROOT -name lto.h -delete

 ################################################################################
 # Remove debugging information from DEST_DIR.

 cd $DIR || exit 1

 find $DEST_DIR -name \*.a -print | xargs ranlib || exit 1
 find $DEST_DIR -name \*.dSYM -print | xargs rm -r || exit 1

 # Strip debugging information from files
 #
 # Use '-l' to strip i386 modules. N.B. that flag doesn't work with kext or
 # PPC objects!
 find $DEST_DIR -perm -0111 -type f \
     ! \( -name '*.la' -o -name gccas -o -name gccld -o -name llvm-config \) \
     -print | xargs -n 1 -P ${SYSCTL} strip -arch all -Sl

 chgrp -h -R wheel $DEST_DIR
 chgrp -R wheel $DEST_DIR

 ################################################################################
 # Remove the docs directory

 rm -rf $DEST_DIR$DEST_ROOT/docs

 ################################################################################
 # w00t! Done!

 exit 0
	#!/bin/sh
	# LLVM LOCAL file B&I

	set -x

	# Build LLVM the "Apple way".
	# Parameters:

	# The first parameter is a space-separated list of the architectures the
	# compilers will run on. For instance, "ppc i386". If the current machine
	# isn't in the list, it will (effectively) be added.
	HOSTS="$1"

	# The second parameter is a space-separated list of the architectures the
	# compilers will generate code for. If the current machine isn't in the list, a
	# compiler for it will get built anyway, but won't be installed.
	# FIXME: The list of targets is currently hard-coded and TARGETS is not used.
	TARGETS="$2"

	# The third parameter is the path to the compiler sources. There should be a
	# shell script named 'configure' in this directory. This script makes a copy...
	ORIG_SRC_DIR="$3"

	# The fourth parameter is the location where the LLVM will be installed. You can
	# move it once it's built, so this mostly controls the layout of $DEST_DIR.
	DEST_ROOT="$4"

	# The fifth parameter is the place where the compiler will be copied once it's
	# built.
	DEST_DIR="$5"

	# The sixth parameter is a directory in which to place information (like
	# unstripped executables and generated source files) helpful in debugging the
	# resulting compiler.
	SYM_DIR="$6"

	# The seventh parameter is a yes/no that indicates whether assertions should be
	# enabled in the LLVM libs/tools.
	LLVM_ASSERTIONS="$7"

	# The eighth parameter is a yes/no that indicates whether this is an optimized
	# build.
	LLVM_OPTIMIZED="$8"

	# The ninth parameter is a yes/no that indicates whether libLTO.dylib
	# should be installed.
	INSTALL_LIBLTO="$9"

	# A yes/no parameter that controls whether to cross-build for an ARM host.
	ARM_HOSTED_BUILD="${10}"

	# A yes/no parameter that controls whether to cross-build for the iOS simulator
	IOS_SIM_BUILD="${11}"

	# The version number of the submission, e.g. 1007.
	LLVM_SUBMIT_VERSION="${12}"

	# The subversion number of the submission, e.g. 03.
	LLVM_SUBMIT_SUBVERSION="${13}"

	# The current working directory is where the build will happen. It may already
	# contain a partial result of an interrupted build, in which case this script
	# will continue where it left off.
	DIR=`pwd`

	DARWIN_VERS=`uname -r \| sed 's/\..*//'`
	echo DARWIN_VERS = $DARWIN_VERS

	################################################################################
	# Run the build.

	# Create the source tree we'll actually use to build, deleting
	# tcl since it doesn't actually build properly in a cross environment
	# and we don't really need it.
	SRC_DIR=$DIR/src
	rm -rf $SRC_DIR \|\| exit 1
	mkdir $SRC_DIR \|\| exit 1
	ln -s $ORIG_SRC_DIR/* $SRC_DIR/ \|\| exit 1
	# We can't use the top-level Makefile as-is. Remove the soft link:
	rm $SRC_DIR/Makefile \|\| exit 1
	# Now create our own by editing the top-level Makefile, deleting every line marked "Apple-style":
	sed -e '/[Aa]pple-style/d' -e '/include.*GNUmakefile/d' $ORIG_SRC_DIR/Makefile > $SRC_DIR/Makefile \|\| exit 1

	# Build the LLVM tree universal.
	mkdir -p $DIR/obj-llvm \|\| exit 1
	cd $DIR/obj-llvm \|\| exit 1

	if [ "$ARM_HOSTED_BUILD" = yes ]; then
	# The cross-tools' build process expects to find an existing cross toolchain
	# under names like 'arm-apple-darwin$DARWIN_VERS-as'; so make them.
	rm -rf $DIR/bin \|\| exit 1
	mkdir $DIR/bin \|\| exit 1
	for prog in ar nm ranlib strip lipo ld as ; do
	P=$DIR/bin/arm-apple-darwin$DARWIN_VERS-${prog}
	T=`xcrun -sdk $SDKROOT -find ${prog}`
	echo '#!/bin/sh' > $P \|\| exit 1
	echo 'exec '$T' "$@"' >> $P \|\| exit 1
	chmod a+x $P \|\| exit 1
	done
	# Try to use the platform llvm-gcc. Fall back to gcc if it's not available.
	for prog in gcc g++ ; do
	P=$DIR/bin/arm-apple-darwin$DARWIN_VERS-${prog}
	T=`xcrun -sdk $SDKROOT -find llvm-${prog}`
	if [ "x$T" = "x" ] ; then
	T=`xcrun -sdk $SDKROOT -find ${prog}`
	fi
	echo '#!/bin/sh' > $P \|\| exit 1
	echo 'exec '$T' -arch armv7 -isysroot '${SDKROOT}' "$@"' >> $P \|\| exit 1
	chmod a+x $P \|\| exit 1
	done

	PATH=$DIR/bin:$PATH
	# otherwise, try to use llvm-gcc if it's available
	elif [ $DARWIN_VERS -gt 9 ]; then
	# If the user has set CC or CXX, respect their wishes. If not,
	# compile with LLVM-GCC/LLVM-G++ if available; if LLVM is not
	# available, fall back to usual GCC/G++ default.
	savedPATH=$PATH ; PATH="/Developer/usr/bin:$PATH"
	XTMPCC=$(which llvm-gcc)
	if [ x$CC = x -a x$XTMPCC != x ] ; then export CC=$XTMPCC ; fi
	XTMPCC=$(which llvm-g++)
	if [ x$CXX = x -a x$XTMPCC != x ] ; then export CXX=$XTMPCC ; fi
	PATH=$savedPATH
	unset XTMPCC savedPATH
	fi

	if [ "$ARM_HOSTED_BUILD" = yes ]; then
	configure_opts="--enable-targets=arm --host=arm-apple-darwin10 \
	--target=arm-apple-darwin10 --build=i686-apple-darwin10"
	elif [ "$IOS_SIM_BUILD" = yes ]; then
	# Use a non-standard "darwin_sim" host triple to trigger a cross-build.
	configure_opts="--enable-targets=x86 --host=i686-apple-darwin_sim \
	--build=i686-apple-darwin10"
	else
	configure_opts="--enable-targets=arm,x86,cbe"
	fi

	if [ \! -f Makefile.config ]; then
	$SRC_DIR/configure --prefix=$DEST_DIR$DEST_ROOT $configure_opts \
	--enable-assertions=$LLVM_ASSERTIONS \
	--enable-optimized=$LLVM_OPTIMIZED \
	--disable-bindings \
	\|\| exit 1
	fi

	SUBVERSION=`echo $RC_ProjectSourceVersion \| sed -e 's/[^.]\.\([0-9]\).*/\1/'`

	if [ "x$SUBVERSION" != "x$RC_ProjectSourceVersion" ]; then
	LLVM_SUBMIT_SUBVERSION=`printf "%02d" $SUBVERSION`
	RC_ProjectSourceVersion=`echo $RC_ProjectSourceVersion \| sed -e 's/\..*//'`
	LLVM_SUBMIT_VERSION=$RC_ProjectSourceVersion
	fi

	if [ "x$LLVM_SUBMIT_SUBVERSION" = "x00" -o "x$LLVM_SUBMIT_SUBVERSION" = "x0" ]; then
	LLVM_VERSION="$LLVM_SUBMIT_VERSION"
	else
	LLVM_VERSION="$LLVM_SUBMIT_VERSION-$LLVM_SUBMIT_SUBVERSION"
	fi

	GCC_VER=`cc --version 2>/dev/null \| sed 1q`

	if echo "$GCC_VER" \| grep GCC > /dev/null; then
	GCC_VER=`echo $GCC_VER \| sed -e 's/.(GCC) \([0-9.][0-9.]\).*/\1/'`
	MAJ_VER=`echo $GCC_VER \| sed 's/\..*//'`
	MIN_VER=`echo $GCC_VER \| sed 's/[^.]\.\([0-9]\).*/\1/'`
	fi

	JOBS_FLAG=""

	# Note: If compiling with GCC 4.0, don't pass the -jN flag. Building universal
	# already has parallelism and we don't want to make the builders hit swap by
	# firing off too many gccs at the same time.
	if [ "x$MAJ_VER" != "x4" -o "x$MIN_VER" != "x0" ]; then
	# Figure out how many make processes to run.
	SYSCTL=`sysctl -n hw.activecpu`

	# sysctl -n hw.* does not work when invoked via B&I chroot /BuildRoot.
	# Builders can default to 2, since even if they are single processor,
	# nothing else is running on the machine.
	if [ -z "$SYSCTL" ]; then
	SYSCTL=2
	fi

	JOBS_FLAG="-j $SYSCTL"
	fi

	make $JOBS_FLAG $OPTIMIZE_OPTS UNIVERSAL=1 UNIVERSAL_ARCH="$HOSTS" \
	UNIVERSAL_SDK_PATH=$SDKROOT \
	NO_RUNTIME_LIBS=1 \
	DISABLE_EDIS=1 \
	DEBUG_SYMBOLS=1 \
	LLVM_SUBMIT_VERSION=$LLVM_SUBMIT_VERSION \
	LLVM_SUBMIT_SUBVERSION=$LLVM_SUBMIT_SUBVERSION \
	CXXFLAGS="-DLLVM_VERSION_INFO='\" Apple Build #$LLVM_VERSION\"'" \
	VERBOSE=1

	if [ $? != 0 ] ; then
	echo "error: LLVM 'make' failed!"
	exit 1
	fi

	################################################################################
	# Construct the actual destination root, by copying stuff from $DIR/dst-* to
	# $DEST_DIR, with occasional 'lipo' commands.

	cd $DEST_DIR \|\| exit 1

	# Clean out DEST_DIR in case -noclean was passed to buildit.
	rm -rf * \|\| exit 1

	cd $DIR/obj-llvm \|\| exit 1

	# Install the tree into the destination directory.
	make $LOCAL_MAKEFLAGS $OPTIMIZE_OPTS UNIVERSAL=1 UNIVERSAL_ARCH="$HOSTS" \
	NO_RUNTIME_LIBS=1 \
	DISABLE_EDIS=1 \
	DEBUG_SYMBOLS=1 \
	LLVM_SUBMIT_VERSION=$LLVM_SUBMIT_VERSION \
	LLVM_SUBMIT_SUBVERSION=$LLVM_SUBMIT_SUBVERSION \
	OPTIMIZE_OPTION='-O3' VERBOSE=1 install

	if ! test $? == 0 ; then
	echo "error: LLVM 'make install' failed!"
	exit 1
	fi

	# Install Version.h
	LLVM_MINOR_VERSION=`echo $LLVM_SUBMIT_SUBVERSION \| sed -e 's,0\([1-9][0-9]\),\1,'`
	if [ "x$LLVM_MINOR_VERSION" = "x" ]; then
	LLVM_MINOR_VERSION=0
	fi
	RC_ProjectSourceSubversion=`printf "%d" $LLVM_MINOR_VERSION`
	echo "#define LLVM_VERSION ${RC_ProjectSourceVersion}" > $DEST_DIR$DEST_ROOT/include/llvm/Version.h
	echo "#define LLVM_MINOR_VERSION ${RC_ProjectSourceSubversion}" >> $DEST_DIR$DEST_ROOT/include/llvm/Version.h

	if [ "x$LLVM_DEBUG" != "x1" ]; then
	# Strip local symbols from llvm libraries.
	#
	# Use '-l' to strip i386 modules. N.B. that flag doesn't work with kext or
	# PPC objects!
	strip -Sl $DEST_DIR$DEST_ROOT/lib/*.[oa]
	for f in `ls $DEST_DIR$DEST_ROOT/lib/*.so`; do
	strip -Sxl $f
	done
	fi

	# Copy over the tblgen utility.
	cp `find $DIR -name tblgen` $DEST_DIR$DEST_ROOT/bin

	# Remove .dir files
	cd $DEST_DIR$DEST_ROOT
	rm -f bin/.dir etc/llvm/.dir lib/.dir

	# Remove PPC64 fat slices.
	cd $DEST_DIR$DEST_ROOT/bin
	if [ $MACOSX_DEPLOYMENT_TARGET = "10.4" ]; then
	find . -perm 755 -type f \! \( -name 'gccas' -o -name 'gccld' -o -name llvm-config \) \
	-exec lipo -extract ppc -extract i386 {} -output {} \;
	elif [ $MACOSX_DEPLOYMENT_TARGET = "10.5" ]; then
	find . -perm 755 -type f \! \( -name 'gccas' -o -name 'gccld' -o -name llvm-config \) \
	-exec lipo -extract ppc7400 -extract i386 {} -output {} \;
	else
	find . -perm 755 -type f \! \( -name 'gccas' -o -name 'gccld' -o -name llvm-config \) \
	-exec lipo -extract i386 -extract x86_64 {} -output {} \;
	fi

	# The Hello dylib is an example of how to build a pass.
	# The BugpointPasses module is only used to test bugpoint.
	# These unversioned dylibs cause verification failures, so do not install them.
	# (The wildcards are used to match a "lib" prefix if it is present.)
	rm $DEST_DIR$DEST_ROOT/lib/*LLVMHello.dylib
	rm $DEST_DIR$DEST_ROOT/lib/*BugpointPasses.dylib

	# Compress manpages
	MDIR=$DEST_DIR$DEST_ROOT/share/man/man1
	gzip -f $MDIR/*

	################################################################################
	# Create SYM_DIR with information required for debugging.

	# Figure out how many make processes to run.
	SYSCTL=`sysctl -n hw.activecpu`

	# hw.activecpu only available in 10.2.6 and later
	if [ -z "$SYSCTL" ]; then
	SYSCTL=`sysctl -n hw.ncpu`
	fi

	# sysctl -n hw.* does not work when invoked via B&I chroot /BuildRoot. Builders
	# can default to 2, since even if they are single processor, nothing else is
	# running on the machine.
	if [ -z "$SYSCTL" ]; then
	SYSCTL=2
	fi

	cd $SYM_DIR \|\| exit 1

	# Clean out SYM_DIR in case -noclean was passed to buildit.
	rm -rf * \|\| exit 1

	# Generate .dSYM files
	find $DEST_DIR -perm -0111 -type f \
	! \( -name '.la' -o -name gccas -o -name gccld -o -name llvm-config -o -name '.a' \) \
	-print \| xargs -n 1 -P ${SYSCTL} dsymutil

	# Save .dSYM files and .a archives
	cd $DEST_DIR \|\| exit 1
	find . \( -path \.dSYM/\ -or -name \*.a \) -print \
	\| cpio -pdml $SYM_DIR \|\| exit 1

	# Save source files.
	mkdir $SYM_DIR/src \|\| exit 1
	cd $DIR \|\| exit 1
	find obj-* -name \.\[chy\] -o -name \.cpp -print \
	\| cpio -pdml $SYM_DIR/src \|\| exit 1

	################################################################################
	# Install and strip libLTO.dylib

	cd $DEST_DIR$DEST_ROOT
	if [ "$INSTALL_LIBLTO" = "yes" ]; then
	DT_HOME="$DEST_DIR/Developer/usr"
	mkdir -p $DT_HOME/lib
	mv lib/libLTO.dylib $DT_HOME/lib/libLTO.dylib

	# Save a copy of the unstripped dylib
	mkdir -p $SYM_DIR/Developer/usr/lib
	cp $DT_HOME/lib/libLTO.dylib $SYM_DIR/Developer/usr/lib/libLTO.dylib

	# Use '-l' to strip i386 modules. N.B. that flag doesn't work with kext or
	# PPC objects!
	strip -arch all -Sl $DT_HOME/lib/libLTO.dylib

	if [ "x$DISABLE_USR_LINKS" == "x" ]; then
	# Add a symlink in /usr/lib for B&I.
	mkdir -p $DEST_DIR/usr/lib/
	(cd $DEST_DIR/usr/lib && \
	ln -s ../../Developer/usr/lib/libLTO.dylib ./libLTO.dylib)
	fi
	else
	rm -f lib/libLTO.dylib
	fi
	rm -f lib/libLTO.a lib/libLTO.la

	# Omit lto.h from the result. Clang will supply.
	find $DEST_DIR$DEST_ROOT -name lto.h -delete

	################################################################################
	# Remove debugging information from DEST_DIR.

	cd $DIR \|\| exit 1

	find $DEST_DIR -name \*.a -print \| xargs ranlib \|\| exit 1
	find $DEST_DIR -name \*.dSYM -print \| xargs rm -r \|\| exit 1

	# Strip debugging information from files
	#
	# Use '-l' to strip i386 modules. N.B. that flag doesn't work with kext or
	# PPC objects!
	find $DEST_DIR -perm -0111 -type f \
	! \( -name '*.la' -o -name gccas -o -name gccld -o -name llvm-config \) \
	-print \| xargs -n 1 -P ${SYSCTL} strip -arch all -Sl

	chgrp -h -R wheel $DEST_DIR
	chgrp -R wheel $DEST_DIR

	################################################################################
	# Remove the docs directory

	rm -rf $DEST_DIR$DEST_ROOT/docs

	################################################################################
	# w00t! Done!

	exit 0