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# Copyright 1999-2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
inherit bash-completion-r1 llvm.org
DESCRIPTION="Common files shared between multiple slots of clang"
HOMEPAGE="https://llvm.org/"
LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
SLOT="0"
KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~sparc ~x86 ~amd64-linux ~ppc-macos ~x64-macos"
IUSE="
default-compiler-rt default-libcxx default-lld llvm-libunwind
hardened stricter
"
PDEPEND="
sys-devel/clang:*
default-compiler-rt? (
sys-devel/clang-runtime[compiler-rt]
llvm-libunwind? ( sys-libs/llvm-libunwind[static-libs] )
!llvm-libunwind? ( sys-libs/libunwind[static-libs] )
)
!default-compiler-rt? ( sys-devel/gcc )
default-libcxx? ( >=sys-libs/libcxx-${PV} )
!default-libcxx? ( sys-devel/gcc )
default-lld? ( sys-devel/lld )
!default-lld? ( sys-devel/binutils )
"
IDEPEND="
!default-compiler-rt? ( sys-devel/gcc-config )
!default-libcxx? ( sys-devel/gcc-config )
"
LLVM_COMPONENTS=( clang/utils )
llvm.org_set_globals
pkg_pretend() {
[[ ${CLANG_IGNORE_DEFAULT_RUNTIMES} ]] && return
local flag missing_flags=()
for flag in default-{compiler-rt,libcxx,lld}; do
if ! use "${flag}" && has_version "sys-devel/clang[${flag}]"; then
missing_flags+=( "${flag}" )
fi
done
if [[ ${missing_flags[@]} ]]; then
eerror "It seems that you have the following flags set on sys-devel/clang:"
eerror
eerror " ${missing_flags[*]}"
eerror
eerror "The default runtimes are now set via flags on sys-devel/clang-common."
eerror "The build is being aborted to prevent breakage. Please either set"
eerror "the respective flags on this ebuild, e.g.:"
eerror
eerror " sys-devel/clang-common ${missing_flags[*]}"
eerror
eerror "or build with CLANG_IGNORE_DEFAULT_RUNTIMES=1."
die "Mismatched defaults detected between sys-devel/clang and sys-devel/clang-common"
fi
}
src_install() {
newbashcomp bash-autocomplete.sh clang
insinto /etc/clang
newins - gentoo-runtimes.cfg <<-EOF
# This file is initially generated by sys-devel/clang-runtime.
# It is used to control the default runtimes using by clang.
--rtlib=$(usex default-compiler-rt compiler-rt libgcc)
--unwindlib=$(usex default-compiler-rt libunwind libgcc)
--stdlib=$(usex default-libcxx libc++ libstdc++)
-fuse-ld=$(usex default-lld lld bfd)
EOF
newins - gentoo-gcc-install.cfg <<-EOF
# This file is maintained by gcc-config.
# It is used to specify the selected GCC installation.
EOF
newins - gentoo-common.cfg <<-EOF
# This file contains flags common to clang, clang++ and clang-cpp.
@gentoo-runtimes.cfg
@gentoo-gcc-install.cfg
@gentoo-hardened.cfg
EOF
# Baseline hardening (bug #851111)
newins - gentoo-hardened.cfg <<-EOF
# Some of these options are added unconditionally, regardless of
# USE=hardened, for parity with sys-devel/gcc.
-fstack-clash-protection
-fstack-protector-strong
-fPIE
-include "${EPREFIX}/usr/include/gentoo/fortify.h"
EOF
dodir /usr/include/gentoo
local fortify_level=$(usex hardened 3 2)
# We have to do this because glibc's headers warn if F_S is set
# without optimization and that would at the very least be very noisy
# during builds and at worst trigger many -Werror builds.
cat >> "${ED}/usr/include/gentoo/fortify.h" <<- EOF || die
#ifndef _FORTIFY_SOURCE
# if defined(__has_feature)
# define __GENTOO_HAS_FEATURE(x) __has_feature(x)
# else
# define __GENTOO_HAS_FEATURE(x) 0
# endif
#
# if defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
# if !defined(__SANITIZE_ADDRESS__) && !__GENTOO_HAS_FEATURE(address_sanitizer) && !__GENTOO_HAS_FEATURE(memory_sanitizer)
# define _FORTIFY_SOURCE ${fortify_level}
# endif
# endif
# undef __GENTOO_HAS_FEATURE
#endif
EOF
if use hardened ; then
cat >> "${ED}/etc/clang/gentoo-hardened.cfg" <<-EOF || die
# Options below are conditional on USE=hardened.
-D_GLIBCXX_ASSERTIONS
# Analogue to GLIBCXX_ASSERTIONS
# https://libcxx.llvm.org/UsingLibcxx.html#assertions-mode
-D_LIBCPP_ENABLE_ASSERTIONS=1
EOF
fi
if use stricter; then
newins - gentoo-stricter.cfg <<-EOF
# This file increases the strictness of older clang versions
# to match the newest upstream version.
# clang-16 defaults
-Werror=implicit-function-declaration
-Werror=implicit-int
-Werror=incompatible-function-pointer-types
# constructs banned by C2x
-Werror=deprecated-non-prototype
# deprecated but large blast radius
#-Werror=strict-prototypes
EOF
cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
@gentoo-stricter.cfg
EOF
fi
local tool
for tool in clang{,++,-cpp}; do
newins - "${tool}.cfg" <<-EOF
# This configuration file is used by ${tool} driver.
@gentoo-common.cfg
EOF
done
}
pkg_preinst() {
if has_version -b sys-devel/gcc-config && has_version sys-devel/gcc
then
local gcc_path=$(gcc-config --get-lib-path 2>/dev/null)
if [[ -n ${gcc_path} ]]; then
cat >> "${ED}/etc/clang/gentoo-gcc-install.cfg" <<-EOF
--gcc-install-dir="${gcc_path%%:*}"
EOF
fi
fi
}
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