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WIP: another workaround for hardcoded compiler versions #100828

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WIP: another workaround for hardcoded compiler versions #100828

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85 changes: 55 additions & 30 deletions eng/common/native/init-compiler.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,9 @@
#
# This file detects the C/C++ compiler and exports it to the CC/CXX environment variables
#
# NOTE: some scripts source this file and rely on stdout being empty, make sure to not output anything here!
# NOTE: some scripts source this file and rely on stdout being empty, make sure
# to not output *anything* here, unless it is an error message that fails the
# build.

if [ -z "$build_arch" ] || [ -z "$compiler" ]; then
echo "Usage..."
Expand Down Expand Up @@ -58,6 +60,26 @@ check_version_exists() {
echo "$desired_version"
}

__baseOS="$(uname)"
set_compiler_version_from_CC() {
if [ "$__baseOS" = "Darwin" ]; then
# On Darwin, the versions from -version/-dumpversion refer to Xcode
# versions, not llvm versions, so we can't rely on them.
return
fi

version="$("$CC" -dumpversion)"
if [ -z "$version" ]; then
echo "Error: $CC -dumpversion didn't provide a version"
exit 1
fi

# gcc and clang often display 3 part versions. However, gcc can show only 1 part in some environments.
IFS=. read -r majorVersion minorVersion _ <<EOF
$version
EOF
}

if [ -z "$CLR_CC" ]; then

# Set default versions
Expand All @@ -74,64 +96,67 @@ if [ -z "$CLR_CC" ]; then
done

if [ -z "$majorVersion" ]; then
if command -v "$compiler" > /dev/null; then
if [ "$(uname)" != "Darwin" ]; then
echo "Warning: Specific version of $compiler not found, falling back to use the one in PATH."
fi
CC="$(command -v "$compiler")"
CXX="$(command -v "$cxxCompiler")"
else
echo "No usable version of $compiler found."
if ! command -v "$compiler" > /dev/null; then
echo "Error: No usable version of $compiler found."
exit 1
fi

CC="$(command -v "$compiler" 2> /dev/null)"
CXX="$(command -v "$cxxCompiler" 2> /dev/null)"
set_compiler_version_from_CC
else
if [ "$compiler" = "clang" ] && [ "$majorVersion" -lt 5 ]; then
if [ "$build_arch" = "arm" ] || [ "$build_arch" = "armel" ]; then
if command -v "$compiler" > /dev/null; then
echo "Warning: Found clang version $majorVersion which is not supported on arm/armel architectures, falling back to use clang from PATH."
CC="$(command -v "$compiler")"
CXX="$(command -v "$cxxCompiler")"
else
echo "Found clang version $majorVersion which is not supported on arm/armel architectures, and there is no clang in PATH."
exit 1
fi
if [ "$compiler" = "clang" ] && [ "$majorVersion" -lt 5 ] && { [ "$build_arch" = "arm" ] || [ "$build_arch" = "armel" ]; }; then
# If a major version was provided explicitly, and it was too old, find a newer compiler instead
if ! command -v "$compiler" > /dev/null; then
echo "Error: Found clang version $majorVersion which is not supported on arm/armel architectures, and there is no clang in PATH."
exit 1
fi

CC="$(command -v "$compiler" 2> /dev/null)"
CXX="$(command -v "$cxxCompiler" 2> /dev/null)"
set_compiler_version_from_CC
fi
fi
else
desired_version="$(check_version_exists "$majorVersion" "$minorVersion")"
if [ "$desired_version" = "-1" ]; then
echo "Could not find specific version of $compiler: $majorVersion $minorVersion."
echo "Error: Could not find specific version of $compiler: $majorVersion $minorVersion."
exit 1
fi
fi

if [ -z "$CC" ]; then
CC="$(command -v "$compiler$desired_version")"
CXX="$(command -v "$cxxCompiler$desired_version")"
if [ -z "$CXX" ]; then CXX="$(command -v "$cxxCompiler")"; fi
CC="$(command -v "$compiler$desired_version" 2> /dev/null)"
CXX="$(command -v "$cxxCompiler$desired_version" 2> /dev/null)"
if [ -z "$CXX" ]; then CXX="$(command -v "$cxxCompiler" 2> /dev/null)"; fi
set_compiler_version_from_CC
fi
else
if [ ! -f "$CLR_CC" ]; then
echo "CLR_CC is set but path '$CLR_CC' does not exist"
echo "Error: CLR_CC is set but path '$CLR_CC' does not exist"
exit 1
fi
CC="$CLR_CC"
CXX="$CLR_CXX"
set_compiler_version_from_CC
fi

if [ -z "$CC" ]; then
echo "Unable to find $compiler."
echo "Error: Unable to find $compiler."
exit 1
fi

# Only lld version >= 9 can be considered stable. lld supports s390x starting from 18.0.
if [ "$compiler" = "clang" ] && [ -n "$majorVersion" ] && [ "$majorVersion" -ge 9 ] && ([ "$build_arch" != "s390x" ] || [ "$majorVersion" -ge 18 ]); then
if "$CC" -fuse-ld=lld -Wl,--version >/dev/null 2>&1; then
LDFLAGS="-fuse-ld=lld"
if [ "$__baseOS" != "Darwin" ]; then
# On Darwin, we always want to use the Apple linker.

# Only lld version >= 9 can be considered stable. lld supports s390x starting from 18.0.
if [ "$compiler" = "clang" ] && [ -n "$majorVersion" ] && [ "$majorVersion" -ge 9 ] && { [ "$build_arch" != "s390x" ] || [ "$majorVersion" -ge 18 ]; }; then
if "$CC" -fuse-ld=lld -Wl,--version >/dev/null 2>&1; then
LDFLAGS="-fuse-ld=lld"
fi
fi
fi

SCAN_BUILD_COMMAND="$(command -v "scan-build$desired_version")"
SCAN_BUILD_COMMAND="$(command -v "scan-build$desired_version" 2> /dev/null)"

export CC CXX LDFLAGS SCAN_BUILD_COMMAND
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