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305 lines
8.8 KiB
305 lines
8.8 KiB
# Copyright 1999-2024 Gentoo Authors
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# Distributed under the terms of the GNU General Public License v2
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EAPI=8
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inherit bash-completion-r1 llvm.org multilib
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DESCRIPTION="Common files shared between multiple slots of clang"
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HOMEPAGE="https://llvm.org/"
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LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
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SLOT="0"
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IUSE="
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default-compiler-rt default-libcxx default-lld
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bootstrap-prefix cet hardened llvm-libunwind
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"
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PDEPEND="
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sys-devel/clang:*
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default-compiler-rt? (
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sys-devel/clang-runtime[compiler-rt]
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llvm-libunwind? ( sys-libs/llvm-libunwind[static-libs] )
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!llvm-libunwind? ( sys-libs/libunwind[static-libs] )
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)
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!default-compiler-rt? ( sys-devel/gcc )
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default-libcxx? ( >=sys-libs/libcxx-${PV}[static-libs] )
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!default-libcxx? ( sys-devel/gcc )
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default-lld? ( >=sys-devel/lld-${PV} )
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!default-lld? ( sys-devel/binutils )
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"
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IDEPEND="
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!default-compiler-rt? ( sys-devel/gcc-config )
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!default-libcxx? ( sys-devel/gcc-config )
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"
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LLVM_COMPONENTS=( clang/utils )
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llvm.org_set_globals
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pkg_pretend() {
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[[ ${CLANG_IGNORE_DEFAULT_RUNTIMES} ]] && return
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local flag missing_flags=()
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for flag in default-{compiler-rt,libcxx,lld}; do
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if ! use "${flag}" && has_version "sys-devel/clang[${flag}]"; then
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missing_flags+=( "${flag}" )
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fi
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done
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if [[ ${missing_flags[@]} ]]; then
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eerror "It seems that you have the following flags set on sys-devel/clang:"
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eerror
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eerror " ${missing_flags[*]}"
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eerror
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eerror "The default runtimes are now set via flags on sys-devel/clang-common."
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eerror "The build is being aborted to prevent breakage. Please either set"
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eerror "the respective flags on this ebuild, e.g.:"
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eerror
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eerror " sys-devel/clang-common ${missing_flags[*]}"
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eerror
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eerror "or build with CLANG_IGNORE_DEFAULT_RUNTIMES=1."
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die "Mismatched defaults detected between sys-devel/clang and sys-devel/clang-common"
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fi
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}
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_doclang_cfg() {
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local triple="${1}"
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local tool
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for tool in ${triple}-clang{,++}; do
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newins - "${tool}.cfg" <<-EOF
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# This configuration file is used by ${tool} driver.
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@gentoo-common.cfg
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@gentoo-common-ld.cfg
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EOF
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if [[ ${triple} == x86_64* ]]; then
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cat >> "${ED}/etc/clang/${tool}.cfg" <<-EOF || die
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@gentoo-cet.cfg
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EOF
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fi
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done
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if use kernel_Darwin; then
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cat >> "${ED}/etc/clang/${triple}-clang++.cfg" <<-EOF || die
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-lc++abi
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EOF
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fi
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newins - "${triple}-clang-cpp.cfg" <<-EOF
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# This configuration file is used by the ${triple}-clang-cpp driver.
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@gentoo-common.cfg
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EOF
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if [[ ${triple} == x86_64* ]]; then
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cat >> "${ED}/etc/clang/${triple}-clang-cpp.cfg" <<-EOF || die
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@gentoo-cet.cfg
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EOF
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fi
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# Install symlinks for triples with other vendor strings since some
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# programs insist on mangling the triple.
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local vendor
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for vendor in gentoo pc unknown; do
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local vendor_triple="${triple%%-*}-${vendor}-${triple#*-*-}"
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for tool in clang{,++,-cpp}; do
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if [[ ! -f "${ED}/etc/clang/${vendor_triple}-${tool}.cfg" ]]; then
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dosym "${triple}-${tool}.cfg" "/etc/clang/${vendor_triple}-${tool}.cfg"
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fi
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done
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done
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}
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doclang_cfg() {
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local triple="${1}"
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_doclang_cfg ${triple}
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# LLVM may have different arch names in some cases. For example in x86
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# profiles the triple uses i686, but llvm will prefer i386 if invoked
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# with "clang" on x86 or "clang -m32" on x86_64. The gentoo triple will
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# be used if invoked through ${CHOST}-clang{,++,-cpp} though.
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#
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# To make sure the correct triples are installed,
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# see Triple::getArchTypeName() in llvm/lib/TargetParser/Triple.cpp
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# and compare with CHOST values in profiles.
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local abi=${triple%%-*}
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case ${abi} in
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armv4l|armv4t|armv5tel|armv6j|armv7a)
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_doclang_cfg ${triple/${abi}/arm}
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;;
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i686)
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_doclang_cfg ${triple/${abi}/i386}
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;;
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sparc)
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_doclang_cfg ${triple/${abi}/sparcel}
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;;
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sparc64)
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_doclang_cfg ${triple/${abi}/sparcv9}
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;;
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esac
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}
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src_install() {
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newbashcomp bash-autocomplete.sh clang
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insinto /etc/clang
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newins - gentoo-runtimes.cfg <<-EOF
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# This file is initially generated by sys-devel/clang-runtime.
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# It is used to control the default runtimes using by clang.
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--rtlib=$(usex default-compiler-rt compiler-rt libgcc)
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--unwindlib=$(usex default-compiler-rt libunwind libgcc)
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--stdlib=$(usex default-libcxx libc++ libstdc++)
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-fuse-ld=$(usex default-lld lld bfd)
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EOF
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newins - gentoo-gcc-install.cfg <<-EOF
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# This file is maintained by gcc-config.
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# It is used to specify the selected GCC installation.
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EOF
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newins - gentoo-common.cfg <<-EOF
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# This file contains flags common to clang, clang++ and clang-cpp.
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@gentoo-runtimes.cfg
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@gentoo-gcc-install.cfg
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@gentoo-hardened.cfg
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# bug #870001
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-include "${EPREFIX}/usr/include/gentoo/maybe-stddefs.h"
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EOF
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# clang-cpp does not like link args being passed to it when directly
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# invoked, so use a separate configuration file.
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newins - gentoo-common-ld.cfg <<-EOF
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# This file contains flags common to clang and clang++
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@gentoo-hardened-ld.cfg
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EOF
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# Baseline hardening (bug #851111)
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newins - gentoo-hardened.cfg <<-EOF
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# Some of these options are added unconditionally, regardless of
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# USE=hardened, for parity with sys-devel/gcc.
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-Xarch_host -fstack-clash-protection
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-Xarch_host -fstack-protector-strong
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-fPIE
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-include "${EPREFIX}/usr/include/gentoo/fortify.h"
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EOF
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newins - gentoo-cet.cfg <<-EOF
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-Xarch_host -fcf-protection=$(usex cet full none)
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EOF
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if use kernel_Darwin; then
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newins - gentoo-hardened-ld.cfg <<-EOF
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# There was -Wl,-z,relro here, but it's not supported on Mac
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# TODO: investigate whether -bind_at_load or -read_only_stubs will do the job
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EOF
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else
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newins - gentoo-hardened-ld.cfg <<-EOF
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# Some of these options are added unconditionally, regardless of
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# USE=hardened, for parity with sys-devel/gcc.
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-Wl,-z,relro
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-Wl,-z,now
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EOF
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fi
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dodir /usr/include/gentoo
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cat >> "${ED}/usr/include/gentoo/maybe-stddefs.h" <<-EOF || die
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/* __has_include is an extension, but it's fine, because this is only
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for Clang anyway. */
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#if defined __has_include && __has_include (<stdc-predef.h>) && !defined(__GLIBC__)
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# include <stdc-predef.h>
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#endif
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EOF
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local fortify_level=$(usex hardened 3 2)
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# We have to do this because glibc's headers warn if F_S is set
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# without optimization and that would at the very least be very noisy
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# during builds and at worst trigger many -Werror builds.
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cat >> "${ED}/usr/include/gentoo/fortify.h" <<- EOF || die
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#ifdef __clang__
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# pragma clang system_header
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#endif
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#ifndef _FORTIFY_SOURCE
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# if defined(__has_feature)
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# define __GENTOO_HAS_FEATURE(x) __has_feature(x)
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# else
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# define __GENTOO_HAS_FEATURE(x) 0
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# endif
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#
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# if defined(__STDC_HOSTED__) && __STDC_HOSTED__ == 1
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# define __GENTOO_NOT_FREESTANDING 1
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# else
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# define __GENTOO_NOT_FREESTANDING 0
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# endif
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#
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# if defined(__OPTIMIZE__) && __OPTIMIZE__ > 0 && __GENTOO_NOT_FREESTANDING > 0
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# if !defined(__SANITIZE_ADDRESS__) && !__GENTOO_HAS_FEATURE(address_sanitizer) && !__GENTOO_HAS_FEATURE(memory_sanitizer)
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# define _FORTIFY_SOURCE ${fortify_level}
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# endif
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# endif
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# undef __GENTOO_HAS_FEATURE
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# undef __GENTOO_NOT_FREESTANDING
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#endif
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EOF
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# TODO: Maybe -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_FAST for
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# non-hardened?
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if use hardened ; then
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cat >> "${ED}/etc/clang/gentoo-hardened.cfg" <<-EOF || die
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# Options below are conditional on USE=hardened.
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-D_GLIBCXX_ASSERTIONS
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# Analogue to GLIBCXX_ASSERTIONS
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# https://libcxx.llvm.org/UsingLibcxx.html#assertions-mode
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# https://libcxx.llvm.org/Hardening.html#using-hardened-mode
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-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE
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EOF
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cat >> "${ED}/etc/clang/gentoo-hardened-ld.cfg" <<-EOF || die
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# Options below are conditional on USE=hardened.
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EOF
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fi
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# We only install config files for supported ABIs because unprefixed tools
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# might be used for crosscompilation where e.g. PIE may not be supported.
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# See bug #912237 and bug #901247. Just ${CHOST} won't do due to bug #912685.
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local abi
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for abi in $(get_all_abis); do
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local abi_chost=$(get_abi_CHOST "${abi}")
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doclang_cfg "${abi_chost}"
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done
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if use kernel_Darwin; then
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cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
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# Gentoo Prefix on Darwin
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-Wl,-search_paths_first
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-Wl,-rpath,${EPREFIX}/usr/lib
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-L ${EPREFIX}/usr/lib
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-isystem ${EPREFIX}/usr/include
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-isysroot ${EPREFIX}/MacOSX.sdk
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EOF
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if use bootstrap-prefix ; then
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# bootstrap-prefix is only set during stage2 of bootstrapping
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# Prefix, where EPREFIX is set to EPREFIX/tmp.
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# Here we need to point it at the future lib dir of the stage3's
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# EPREFIX.
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cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
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-Wl,-rpath,${EPREFIX}/../usr/lib
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EOF
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fi
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fi
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}
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pkg_preinst() {
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if has_version -b sys-devel/gcc-config && has_version sys-devel/gcc
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then
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local gcc_path=$(gcc-config --get-lib-path 2>/dev/null)
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if [[ -n ${gcc_path} ]]; then
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cat >> "${ED}/etc/clang/gentoo-gcc-install.cfg" <<-EOF
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--gcc-install-dir="${gcc_path%%:*}"
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EOF
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fi
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fi
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}
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