sys-libs/libunwind: use __asm__ instead of asm (bug #635674)

An upstream patch ca6b6f3ad9190
"libunwind-arm: fix build failure due to asm()"
should improve support for building mesa on arm.

Reported-by: Maciej S. Szmigiero
Closes: https://bugs.gentoo.org/635674
Package-Manager: Portage-2.3.43, Repoman-2.3.10

2 files changed, 152 insertions, 0 deletions

diff --git a/sys-libs/libunwind/files/libunwind-1.2.1-arm-__asm__.patch b/sys-libs/libunwind/files/libunwind-1.2.1-arm-__asm__.patch
new file mode 100644
index 000000000000..4b6debabefcf
--- /dev/null
+++ b/sys-libs/libunwind/files/libunwind-1.2.1-arm-__asm__.patch
@@ -0,0 +1,47 @@
+https://bugs.gentoo.org/635674
+
+From ca6b6f3ad9190814ef7869e8c7e73dae0922f647 Mon Sep 17 00:00:00 2001
+From: Romain Naour <romain.naour@smile.fr>
+Date: Mon, 3 Jul 2017 15:31:10 +0200
+Subject: [PATCH] libunwind-arm: fix build failure due to asm()
+
+mesa3d on ARM build with libunwind support enabled fail to build due to asm()
+function used when building with -std=c99.
+The gcc documentation [1] suggest to use __asm__ instead of asm.
+
+Fixes:
+https://urldefense.proofpoint.com/v2/url?u=http-3A__autobuild.buildroot.net_results_3ef_3efe156b6494e4392b6c31de447ee2c72acc1a53&d=DwICAg&c=5VD0RTtNlTh3ycd41b3MUw&r=vou6lT5jmE_fWQWZZgNrsMWu4RT87QAB9V07tPHlP5U&m=BlAszRQ0vewy5vW7raCh9FmNOACKez_juz55zoiNfUs&s=4sXL6_rFriQz7qi5ygKXBIVHMc7YSdCBnkkHoi347CU&e=
+
+[1] https://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate-Keywords
+
+Signed-off-by: Romain Naour <romain.naour@smile.fr>
+Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
+---
+ include/libunwind-arm.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/libunwind-arm.h b/include/libunwind-arm.h
+index f208487a..1c856faf 100644
+--- a/include/libunwind-arm.h
++++ b/include/libunwind-arm.h
+@@ -265,7 +265,7 @@ unw_tdep_context_t;
+ #ifndef __thumb__
+ #define unw_tdep_getcontext(uc) (({                                     \
+   unw_tdep_context_t *unw_ctx = (uc);                                   \
+-  register unsigned long *unw_base asm ("r0") = unw_ctx->regs;          \
++  register unsigned long *unw_base __asm__ ("r0") = unw_ctx->regs;      \
+   __asm__ __volatile__ (                                                \
+     "stmia %[base], {r0-r15}"                                           \
+     : : [base] "r" (unw_base) : "memory");                              \
+@@ -273,7 +273,7 @@ unw_tdep_context_t;
+ #else /* __thumb__ */
+ #define unw_tdep_getcontext(uc) (({                                     \
+   unw_tdep_context_t *unw_ctx = (uc);                                   \
+-  register unsigned long *unw_base asm ("r0") = unw_ctx->regs;          \
++  register unsigned long *unw_base __asm__ ("r0") = unw_ctx->regs;      \
+   __asm__ __volatile__ (                                                \
+     ".align 2\nbx pc\nnop\n.code 32\n"                                  \
+     "stmia %[base], {r0-r15}\n"                                         \
+-- 
+2.18.0
+
diff --git a/sys-libs/libunwind/libunwind-1.2.1-r2.ebuild b/sys-libs/libunwind/libunwind-1.2.1-r2.ebuild
new file mode 100644
index 000000000000..eb96d2bf8906
--- /dev/null
+++ b/sys-libs/libunwind/libunwind-1.2.1-r2.ebuild
@@ -0,0 +1,105 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+MY_PV=${PV/_/-}
+MY_P=${PN}-${MY_PV}
+inherit autotools eutils libtool multilib-minimal
+
+DESCRIPTION="Portable and efficient API to determine the call-chain of a program"
+HOMEPAGE="https://savannah.nongnu.org/projects/libunwind"
+SRC_URI="mirror://nongnu/libunwind/${MY_P}.tar.gz"
+
+LICENSE="MIT"
+SLOT="7"
+KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux"
+IUSE="debug debug-frame doc libatomic lzma +static-libs"
+
+RESTRICT="test" # half of tests are broken (toolchain version dependent)
+
+# We just use the header from libatomic.
+RDEPEND="lzma? ( app-arch/xz-utils )"
+DEPEND="${RDEPEND}
+	libatomic? ( dev-libs/libatomic_ops )"
+
+S="${WORKDIR}/${MY_P}"
+
+MULTILIB_WRAPPED_HEADERS=(
+	/usr/include/libunwind.h
+
+	# see libunwind.h for the full list of arch-specific headers
+	/usr/include/libunwind-aarch64.h
+	/usr/include/libunwind-arm.h
+	/usr/include/libunwind-hppa.h
+	/usr/include/libunwind-ia64.h
+	/usr/include/libunwind-mips.h
+	/usr/include/libunwind-ppc32.h
+	/usr/include/libunwind-ppc64.h
+	/usr/include/libunwind-sh.h
+	/usr/include/libunwind-tilegx.h
+	/usr/include/libunwind-x86.h
+	/usr/include/libunwind-x86_64.h
+)
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.2-coredump-regs.patch #586092
+	"${FILESDIR}"/${PN}-1.2-ia64-undwarf.patch
+	"${FILESDIR}"/${PN}-1.2-ia64-ptrace-coredump.patch
+	"${FILESDIR}"/${PN}-1.2-ia64-missing.patch
+	"${FILESDIR}"/${PN}-1.2.1-fix_version_macros.patch
+	"${FILESDIR}"/${PN}-1.2.1-only-include-execinfo_h-if-avaliable.patch
+	"${FILESDIR}"/${PN}-1.2.1-no-PROTECTED.patch #659732
+	"${FILESDIR}"/${PN}-1.2.1-arm-__asm__.patch #635674
+)
+
+src_prepare() {
+	default
+	chmod +x src/ia64/mk_cursor_i || die
+	# Since we have tests disabled via RESTRICT, disable building in the subdir
+	# entirely.  This worksaround some build errors too. #484846
+	sed -i -e '/^SUBDIRS/s:tests::' Makefile.in || die
+
+	elibtoolize
+	eautoreconf
+}
+
+multilib_src_configure() {
+	# --enable-cxx-exceptions: always enable it, headers provide the interface
+	# and on some archs it is disabled by default causing a mismatch between the
+	# API and the ABI, bug #418253
+	# conservative-checks: validate memory addresses before use; as of 1.0.1,
+	# only x86_64 supports this, yet may be useful for debugging, couple it with
+	# debug useflag.
+	ECONF_SOURCE="${S}" \
+	ac_cv_header_atomic_ops_h=$(usex libatomic) \
+	econf \
+		--enable-cxx-exceptions \
+		--enable-coredump \
+		--enable-ptrace \
+		--enable-setjmp \
+		$(use_enable debug-frame) \
+		$(use_enable doc documentation) \
+		$(use_enable lzma minidebuginfo) \
+		$(use_enable static-libs static) \
+		$(use_enable debug conservative_checks) \
+		$(use_enable debug)
+}
+
+multilib_src_compile() {
+	# Bug 586208
+	CCACHE_NODIRECT=1 default
+}
+
+multilib_src_test() {
+	# Explicitly allow parallel build of tests.
+	# Sandbox causes some tests to freak out.
+	SANDBOX_ON=0 emake check
+}
+
+multilib_src_install() {
+	default
+	# libunwind-ptrace.a (and libunwind-ptrace.h) is separate API and without
+	# shared library, so we keep it in any case
+	use static-libs || find "${ED}"usr '(' -name 'libunwind-generic.a' -o -name 'libunwind*.la' ')' -delete
+}