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llvm-mingw/build-libcxx.sh
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Martin Storsjö bd9e16f732 build-libcxx: Build with -ffunction-sections -fdata-sections
This allows shrinking binaries somewhat, if linking the runtimes
statically and using the -Wl,--gc-sections option.
2022-02-09 14:02:20 +02:00

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#!/bin/sh
#
# Copyright (c) 2018 Martin Storsjo
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
set -e
BUILD_STATIC=1
BUILD_SHARED=1
while [ $# -gt 0 ]; do
if [ "$1" = "--disable-shared" ]; then
BUILD_SHARED=
elif [ "$1" = "--enable-shared" ]; then
BUILD_SHARED=1
elif [ "$1" = "--disable-static" ]; then
BUILD_STATIC=
elif [ "$1" = "--enable-static" ]; then
BUILD_STATIC=1
else
PREFIX="$1"
fi
shift
done
if [ -z "$PREFIX" ]; then
echo $0 [--disable-shared] [--disable-static] dest
exit 1
fi
mkdir -p "$PREFIX"
PREFIX="$(cd "$PREFIX" && pwd)"
export PATH="$PREFIX/bin:$PATH"
: ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
if [ ! -d llvm-project/libunwind ] || [ -n "$SYNC" ]; then
CHECKOUT_ONLY=1 ./build-llvm.sh
fi
cd llvm-project
LLVM_PATH="$(pwd)/llvm"
cd runtimes
if [ -n "$(which ninja)" ]; then
CMAKE_GENERATOR="Ninja"
NINJA=1
BUILDCMD=ninja
else
: ${CORES:=$(nproc 2>/dev/null)}
: ${CORES:=$(sysctl -n hw.ncpu 2>/dev/null)}
: ${CORES:=4}
case $(uname) in
MINGW*)
CMAKE_GENERATOR="MSYS Makefiles"
;;
*)
;;
esac
BUILDCMD=make
fi
build_all() {
type="$1"
CMAKEFLAGS=""
if [ "$type" = "shared" ]; then
SHARED=TRUE
STATIC=FALSE
CMAKEFLAGS="$CMAKEFLAGS -DLIBCXXABI_USE_LLVM_UNWINDER=ON"
else
SHARED=FALSE
STATIC=TRUE
fi
for arch in $ARCHS; do
[ -z "$CLEAN" ] || rm -rf build-$arch-$type
mkdir -p build-$arch-$type
cd build-$arch-$type
cmake \
${CMAKE_GENERATOR+-G} "$CMAKE_GENERATOR" \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX="$PREFIX/$arch-w64-mingw32" \
-DCMAKE_C_COMPILER=$arch-w64-mingw32-clang \
-DCMAKE_CXX_COMPILER=$arch-w64-mingw32-clang++ \
-DCMAKE_CXX_COMPILER_TARGET=$arch-w64-windows-gnu \
-DCMAKE_C_FLAGS="-ffunction-sections -fdata-sections" \
-DCMAKE_CXX_FLAGS="-ffunction-sections -fdata-sections" \
-DCMAKE_CROSSCOMPILING=TRUE \
-DCMAKE_SYSTEM_NAME=Windows \
-DCMAKE_C_COMPILER_WORKS=TRUE \
-DCMAKE_CXX_COMPILER_WORKS=TRUE \
-DLLVM_PATH="$LLVM_PATH" \
-DCMAKE_AR="$PREFIX/bin/llvm-ar" \
-DCMAKE_RANLIB="$PREFIX/bin/llvm-ranlib" \
-DLLVM_ENABLE_RUNTIMES="libunwind;libcxxabi;libcxx" \
-DLIBUNWIND_USE_COMPILER_RT=TRUE \
-DLIBUNWIND_ENABLE_SHARED=$SHARED \
-DLIBUNWIND_ENABLE_STATIC=$STATIC \
-DLIBCXX_USE_COMPILER_RT=ON \
-DLIBCXX_ENABLE_SHARED=$SHARED \
-DLIBCXX_ENABLE_STATIC=$STATIC \
-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF \
-DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=TRUE \
-DLIBCXX_CXX_ABI=libcxxabi \
-DLIBCXX_LIBDIR_SUFFIX="" \
-DLIBCXX_INCLUDE_TESTS=FALSE \
-DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=FALSE \
-DLIBCXXABI_USE_COMPILER_RT=ON \
-DLIBCXXABI_ENABLE_SHARED=OFF \
-DLIBCXXABI_LIBDIR_SUFFIX="" \
$CMAKEFLAGS \
..
$BUILDCMD ${CORES+-j$CORES}
$BUILDCMD install
cd ..
done
}
# Build shared first and static afterwards; the headers for static linking also
# work when linking against the DLL, but not vice versa.
[ -z "$BUILD_SHARED" ] || build_all shared
[ -z "$BUILD_STATIC" ] || build_all static