dev-util/ccache: add USE=static-c++ which embeds libstdc++

To ease building gcc with ccache we need to handle the case of
LD_PRELOAD=./inplace/libstdc++.so injected by gcc's build system.

USE=static-c++ uses -static-libstdc++ for it.

Reported-by: Mihai Moldovan
Bug: https://bugs.gentoo.org/761220
Package-Manager: Portage-3.0.19, Repoman-3.0.3
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

2 files changed, 92 insertions, 0 deletions

diff --git a/dev-util/ccache/ccache-4.3-r1.ebuild b/dev-util/ccache/ccache-4.3-r1.ebuild
new file mode 100644
index 000000000000..1410477f616f
--- /dev/null
+++ b/dev-util/ccache/ccache-4.3-r1.ebuild
@@ -0,0 +1,89 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake toolchain-funcs
+
+DESCRIPTION="fast compiler cache"
+HOMEPAGE="https://ccache.dev/"
+SRC_URI="https://github.com/ccache/ccache/releases/download/v${PV}/ccache-${PV}.tar.xz"
+
+LICENSE="GPL-3 LGPL-3"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+IUSE="static-c++ test"
+
+DEPEND=""
+RDEPEND="${DEPEND}
+	app-arch/zstd:0=
+	dev-util/shadowman
+	sys-apps/gentoo-functions
+"
+# clang-specific tests use dev-libs/elfutils to compare objects for equality.
+# Let's pull in the dependency unconditionally.
+DEPEND+="
+	test? ( dev-libs/elfutils )
+"
+BDEPEND="
+	app-text/asciidoc
+"
+
+RESTRICT="!test? ( test )"
+
+DOCS=( doc/{AUTHORS,MANUAL,NEWS}.adoc CONTRIBUTING.md README.md )
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-3.5-nvcc-test.patch
+	"${FILESDIR}"/${PN}-4.0-objdump.patch
+	"${FILESDIR}"/${PN}-4.1-avoid-run-user.patch
+)
+
+src_prepare() {
+	cmake_src_prepare
+
+	sed \
+		-e "/^EPREFIX=/s:'':'${EPREFIX}':" \
+		"${FILESDIR}"/ccache-config-3 > ccache-config || die
+
+	# mainly used in tests
+	tc-export CC OBJDUMP
+
+	# Avoid dependency on libstdc++.so. Useful for cases when
+	# we would like to use ccache to build older gcc which injects
+	# into ccache locally built (possibly outdated) libstdc++
+	# See bug #761220 for examples.
+	#
+	# Ideally gcc should not use LD_PRELOAD to avoid this type of failures.
+	use static-c++ && append-ldflags -static-libstdc++
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DUSE_CCACHE=OFF
+		-DUSE_FASTER_LINKER=OFF
+		-DZSTD_FROM_INTERNET=OFF
+	)
+
+	cmake_src_configure
+}
+
+src_install() {
+	cmake_src_install
+
+	dobin ccache-config
+	insinto /usr/share/shadowman/tools
+	newins - ccache <<<"${EPREFIX}/usr/lib/ccache/bin"
+}
+
+pkg_prerm() {
+	if [[ -z ${REPLACED_BY_VERSION} && ${ROOT:-/} == / ]] ; then
+		eselect compiler-shadow remove ccache
+	fi
+}
+
+pkg_postinst() {
+	if [[ ${ROOT:-/} == / ]]; then
+		eselect compiler-shadow update ccache
+	fi
+}
diff --git a/dev-util/ccache/metadata.xml b/dev-util/ccache/metadata.xml
index e27519ca728a..f673d3c58361 100644
--- a/dev-util/ccache/metadata.xml
+++ b/dev-util/ccache/metadata.xml
@@ -5,6 +5,9 @@
 		<email>toolchain@gentoo.org</email>
 		<name>Gentoo Toolchain Project</name>
 	</maintainer>
+	<use>
+		<flag name="static-c++">Avoid dynamic dependency on gcc's libstdc++.</flag>
+	</use>
 	<longdescription lang="en">
 		ccache acts as a caching pre-processor to C/C++ compilers, improving
 		compilation time when recompiling previously compiled source.