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Force use of legacy assembler with GCC 4.x
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Address "ld: too many personality routines for compact unwind" errors and "section '__textcoal_nt' is deprecated" warnings that were being generated because legacy GCCs were inadvertently invoking the Xcode installation's default (modern) assembler (at Toolchains/XcodeDefault.xctoolchain/usr/bin/as). On installation, the default assembler is replaced with a script that auto-selects a legacy assembler appropriate for the specified build architecture.
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@devernay
devernay committed May 2, 2017
1 parent e716848 commit 34894ce
Showing 1 changed file with 88 additions and 7 deletions.
95 changes: 88 additions & 7 deletions XcodeLegacy.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,12 @@
# XCodeLegacy.sh
#
# Original author: Frederic Devernay <[email protected]>
# Contributor: Garrett Walbridge <[email protected]>
# Contributors:
# - Garrett Walbridge <[email protected]>
# - Jae Liu <ling32945@github>
# - Eric Knibbe <EricFromCanada@github>
# - Chris Roueche <croueche@github>
#
# License: Creative Commons BY-NC-SA 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/
#
# History:
Expand All @@ -16,7 +21,7 @@
# 1.7 (05/04/2016): Xcode 7.3 disables support for older SDKs, fix that
# 1.8 (07/04/2016): add options to install only some SDKs or compilers only
# 1.9 (16/09/2016): Xcode 8 dropped 10.11 SDK, get it from Xcode 7.3.1
# 2.0 (15/01/2017): Xcode 8 cannot always link i386 for OS X 10.5, use the Xcode 3 linker for this arch too
# 2.0 (02/05/2017): Xcode 8 cannot always link i386 for OS X 10.5, use the Xcode 3 linker for this arch too. Force use of legacy assembler with GCC 4.x.

#set -e
#set -u
Expand Down Expand Up @@ -251,7 +256,7 @@ case $1 in
pkgutil --expand "$MNTDIR/Xcode and iOS SDK/Packages/DeveloperToolsCLI.pkg" /tmp/XC3

(cd /tmp/XC3 || exit; gzip -dc Payload |cpio -id --quiet usr/bin usr/libexec) #we only need these, see https://github.com/devernay/xcodelegacy/issues/8
( (cd /tmp/XC3 || exit; tar cf - usr/libexec/gcc/darwin/ppc usr/libexec/gcc/darwin/ppc64) |gzip -c > XcodePPCas.tar.gz) && echo "*** Created XcodePPCas.tar.gz in directory $(pwd)"
( (cd /tmp/XC3 || exit; tar cf - usr/libexec/gcc/darwin/ppc usr/libexec/gcc/darwin/ppc64 usr/libexec/gcc/darwin/i386 usr/libexec/gcc/darwin/x86_64) |gzip -c > Xcode3as.tar.gz) && echo "*** Created Xcode3as.tar.gz in directory $(pwd)"
( (cd /tmp/XC3 || exit; tar cf - usr/bin/ld) |gzip -c > Xcode3ld.tar.gz) && echo "*** Created Xcode3ld.tar.gz in directory $(pwd)"

#(cp "$MNTDIR/Xcode and iOS SDK/Packages/gcc4.0.pkg" xcode_3.2.6_gcc4.0.pkg) && echo "*** Created xcode_3.2.6_gcc4.0.pkg in directory $(pwd)"
Expand Down Expand Up @@ -494,14 +499,86 @@ EOF
fi

if [ -f "$GCCDIR/usr/libexec/gcc/darwin/ppc/as" ]; then
echo "*** Not installing XcodePPCas.tar.gz (found installed in $GCCDIR/usr/libexec/gcc/darwin/ppc/as, uninstall first to force install)"
echo "*** Not installing Xcode3as.tar.gz (found installed in $GCCDIR/usr/libexec/gcc/darwin/ppc/as, uninstall first to force install)"
else
(gzip -dc XcodePPCas.tar.gz | (cd "$GCCDIR" || exit; tar xf -))
(gzip -dc Xcode3as.tar.gz | (cd "$GCCDIR" || exit; tar xf -))
mkdir -p "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/ppc"
mkdir -p "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/ppc64"
mkdir -p "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/i386"
mkdir -p "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/x86_64"
ln -sf "$GCCDIR/usr/libexec/gcc/darwin/ppc/as" "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/ppc/as"
ln -sf "$GCCDIR/usr/libexec/gcc/darwin/ppc64/as" "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/ppc64/as"
echo "*** installed XcodePPCas.tar.gz"
# Xcodes >= 4 already include an acceptable GNU legacy assembler
# (v1.38) for i386 and x86_64 in $GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as.
# When they no longer do, enable these links (conditionally,
# of course).
#ln -sf "$GCCDIR/usr/libexec/gcc/darwin/i386/as" "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/i386/as"
#ln -sf "$GCCDIR/usr/libexec/gcc/darwin/x86_64/as" "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/libexec/as/x86_64/as"

# Replace Xcode's modern toolchain assembler with a script
# that auto-selects the proper legacy assembler based on the
# command line's -arch parameter. Using a legacy assembler fixes
# "ld: too many personality routines for compact unwind" errors
# and "section '__textcoal_nt' is deprecated" warnings emitted
# by Xcode 7+ assemblers.
# First, though, don't overwrite the original assembler if
# XcodeLegacy is installed twice.
if [ ! -f "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as-original" ]; then
mv "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as" "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as-original"
fi
# NB: While only gcc uses the assembler in our builds (it pipes the
# output of usr/libexec/gcc/*-apple-darwin10/4.*/ccobj1plus into
# usr/libexec/gcc/*-apple-darwin10/4.*/as -> usr/bin/as), we can't
# simply change the link to, say, usr/libexec/gcc/darwin/i386/as
# because the assembler seems to want the -arch parameter to match
# its containing folder. Hence, a script (like for ld, below).
# NB: To keep it simple, the script assumes that anyone invoking
# the toolchain's usr/bin/as wants to use Xcode 3's assembler.
# NB: AS_DIR resolves as the directory of the (source) link that
# invoked the script.
cat <<AS_EOF >> "$GCCDIR"/Toolchains/XcodeDefault.xctoolchain/usr/bin/as
#!/bin/bash
ARCH=''
ARCH_FOUND=0
for var in "\$@"
do
if [ "\$ARCH_FOUND" -eq '1' ]; then
ARCH=\$var
break;
elif [ "\$var" = '-arch' ]; then
ARCH_FOUND=1
fi
done
AS_DIR=\`dirname "\$0"\`
AS_RESULT=255
if [ "\$ARCH_FOUND" -eq '1' ]; then
if [ -x "\$AS_DIR/../../../as/\$ARCH/as" ]; then
AS="\$AS_DIR/../../../as/\$ARCH/as"
else
echo "Error: cannot find as for \$ARCH in \$AS_DIR/../../../as/\$ARCH"
exit 1
fi
\`\$AS "\$@"\`
AS_RESULT=\$?
else
if [ -x "\$AS_DIR/../../../../bin/as-original" ]; then
ASORIGINAL="\$AS_DIR/../../../../bin/as-original"
else
echo "Error: cannot find as-original in \$AS_DIR/../../../../bin/as-original"
exit 1
fi
\`\$ASORIGINAL "\$@"\`
AS_RESULT=\$?
fi
exit \$AS_RESULT
AS_EOF
chmod +x "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as"
echo "*** installed Xcode3as.tar.gz"
fi

if [ -f "$GCCDIR/usr/libexec/gcc/darwin/ppc/ld" ]; then
Expand Down Expand Up @@ -858,7 +935,7 @@ SPEC_EOF
#

if [ "$compilers" = 1 ]; then
rm XcodePluginGCC40.tar.gz XcodePPCas.tar.gz Xcode3ld.tar.gz xcode_3.2.6_gcc4.0.pkg xcode_3.2.6_gcc4.2.pkg xcode_3.2.6_llvm-gcc4.2.pkg XcodePluginGCC42-Xcode4.tar.gz XcodePluginGCC42.tar.gz XcodePluginLLVMGCC42.tar.gz Xcode3gcc40.tar.gz Xcode3gcc42.tar.gz Xcode3llvmgcc42.tar.gz 2>/dev/null
rm XcodePluginGCC40.tar.gz Xcode3as.tar.gz Xcode3ld.tar.gz xcode_3.2.6_gcc4.0.pkg xcode_3.2.6_gcc4.2.pkg xcode_3.2.6_llvm-gcc4.2.pkg XcodePluginGCC42-Xcode4.tar.gz XcodePluginGCC42.tar.gz XcodePluginLLVMGCC42.tar.gz Xcode3gcc40.tar.gz Xcode3gcc42.tar.gz Xcode3llvmgcc42.tar.gz 2>/dev/null
fi
#for i in 10.4u 10.5 10.6 10.7 10.8 10.9 10.10; do
if [ "$osx104" = 1 ]; then
Expand Down Expand Up @@ -923,6 +1000,10 @@ SPEC_EOF
rm -rf "$f"
fi
done
if [ -f "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as-original" ]; then
rm "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as"
mv -f "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as-original" "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/as"
fi
if [ -f "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld-original" ]; then
rm "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld"
mv -f "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld-original" "$GCCDIR/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld"
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