sys-devel/clang-toolchain-symlinks: New package for GCC-free sys

New package that installs generic "cc", "c++" and "cpp" symlinks
to Clang, for use on GCC-free systems.  It can also install "gcc"
and "g++" for better compatibility, if desired.

Signed-off-by: Michał Górny <mgorny@gentoo.org>

2 files changed, 73 insertions, 0 deletions

diff --git a/sys-devel/clang-toolchain-symlinks/clang-toolchain-symlinks-16.ebuild b/sys-devel/clang-toolchain-symlinks/clang-toolchain-symlinks-16.ebuild
new file mode 100644
index 000000000000..980427e31a5e
--- /dev/null
+++ b/sys-devel/clang-toolchain-symlinks/clang-toolchain-symlinks-16.ebuild
@@ -0,0 +1,52 @@
+# Copyright 2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit multilib
+
+DESCRIPTION="Symlinks to use Clang on GCC-free system"
+HOMEPAGE="https://wiki.gentoo.org/wiki/Project:LLVM"
+SRC_URI=""
+S=${WORKDIR}
+
+LICENSE="public-domain"
+SLOT="${PV}"
+KEYWORDS=""
+PROPERTIES="live"
+IUSE="gcc-symlinks +native-symlinks"
+
+RDEPEND="
+	sys-devel/clang:${SLOT}
+"
+
+src_install() {
+	local tools=()
+
+	if use native-symlinks; then
+		tools+=(
+			cc:clang
+			cpp:clang-cpp
+			c++:clang++
+		)
+	fi
+	if use gcc-symlinks; then
+		tools+=(
+			gcc:clang
+			g++:clang++
+		)
+	fi
+
+	local abi t
+	local dest=/usr/lib/llvm/${SLOT}/bin
+	dodir "${dest}"
+	for t in "${tools[@]}"; do
+		dosym "${t#*:}" "${dest}/${t%:*}"
+	done
+	for abi in $(get_all_abis); do
+		local abi_chost=$(get_abi_CHOST "${abi}")
+		for t in "${tools[@]}"; do
+			dosym "${t#*:}" "${dest}/${abi_chost}-${t%:*}"
+		done
+	done
+}
diff --git a/sys-devel/clang-toolchain-symlinks/metadata.xml b/sys-devel/clang-toolchain-symlinks/metadata.xml
new file mode 100644
index 000000000000..58c5027c2994
--- /dev/null
+++ b/sys-devel/clang-toolchain-symlinks/metadata.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>llvm@gentoo.org</email>
+	</maintainer>
+	<use>
+		<flag name="gcc-symlinks">
+			Install symlinks for 'gcc' and 'g++' for extra
+			compatibility.
+		</flag>
+		<flag name="native-symlinks">
+			Install generic tool symlinks like 'cc' and 'c++',
+			as well as ${CTARGET}-*. These symlinks are installed
+			into slotted LLVM bindir, so they should not take precedence
+			over symlinks installed into /usr/bin
+			by <pkg>sys-devel/gcc-config</pkg> but they can be helpful
+			for GCC-free setups.
+		</flag>
+	</use>
+</pkgmetadata>