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support using an existing clang installation

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add an option --host-clang which will skip building llvm,
and instead provide symlinks and wrappers for clang and
llvm tools.

Currently the clang version is detected, but it does not
affect the llvm version that will be downloaded and used.
This commit is contained in:
Norbert Lange authored and Martin Storsjö committed 2024-02-26 00:22:14 +02:00
1 parent da480f0100
commit 47355937ad
3 files changed
+72 -12
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install-wrappers.sh
+45 -1
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@@ -17,9 +17,15 @@
set -e
unset HOST
unset HOST_CLANG
while [ $# -gt 0 ]; do
case "$1" in
--host-clang|--host-clang=*)
HOST_CLANG=${1#--host-clang}
HOST_CLANG=${HOST_CLANG#=}
HOST_CLANG=${HOST_CLANG:-clang}
;;
--host=*)
HOST="${1#*=}"
;;
@@ -30,7 +36,7 @@ while [ $# -gt 0 ]; do
shift
done
if [ -z "$PREFIX" ]; then
echo $0 [--host=triple] dest
echo $0 [--host=triple] [--host-clang[=clang]] dest
exit 1
fi
mkdir -p "$PREFIX"
@@ -58,6 +64,44 @@ else
esac
fi
if [ -n "${HOST_CLANG}" ]; then
HOST_CLANG_EXE=$(command -v $HOST_CLANG)
HOST_CLANG_VER=$(echo "__clang_major__ __clang_minor__ __clang_patchlevel__" | $HOST_CLANG_EXE -E -P -x c - | xargs printf '%d.%d.%d')
mkdir -p $PREFIX/bin
# ex. /usr/lib/llvm-17/lib/clang/17
resdir=$($HOST_CLANG -print-resource-dir)
# ex. /usr/lib/llvm-17
llvmdir=${resdir%/lib/clang/*}
# ex /lib/clang/17
clangres=${resdir#$llvmdir}
mkdir -p $PREFIX$clangres
# link the header directory, prevent modification
ln -snf $resdir/include $PREFIX$clangres/include
# Note: clang will detect the "InstalledDir" based on the path that was used to invoke the tools
# This might still have some hidden effects
printf '#!/bin/sh\nsr=$(dirname "$(dirname "$(readlink -f "$0")")")\nexec %s -resource-dir="$sr"%s --sysroot="$sr" "$@"\n' "$HOST_CLANG_EXE" "$clangres" > $PREFIX/bin/clang
# printf '#!/bin/sh\nsr=$(dirname "$(dirname "$(readlink -f "$0")")")\nexec %s -resource-dir="$sr"%s --sysroot="$sr" "$@"\n' "$(readlink -f "$HOST_CLANG_EXE")" "$clangres" > $PREFIX/bin/clang
chmod 755 $PREFIX/bin/clang
ln -sf clang $PREFIX/bin/clang++
ln -sf clang $PREFIX/bin/clang-cpp
echo "Using existing clang $HOST_CLANG_EXE ($HOST_CLANG_VER)"
$PREFIX/bin/clang -v
# prefer system llvm installation, but search in llvm private paths (eg. debian does not symlink all tools into /usr/bin)
llvmexec="$PATH:$llvmdir/bin"
for exec in ld.lld llvm-ar llvm-ranlib llvm-nm llvm-objcopy llvm-strip llvm-rc llvm-cvtres \
llvm-addr2line llvm-dlltool llvm-readelf llvm-size llvm-strings llvm-addr2line llvm-windres llvm-ml; do
execpath=$(PATH=$llvmexec command -v $exec) && ln -sf $execpath $PREFIX/bin/$exec
done
fi
if [ -n "$MACOS_REDIST" ]; then
: ${MACOS_REDIST_ARCHS:=arm64 x86_64}
: ${MACOS_REDIST_VERSION:=10.9}