dev-libs/boehm-gc: fix configure tests with Clang 15

Signed-off-by: Sam James <sam@gentoo.org>

dev-libs/boehm-gc/boehm-gc-8.2.2-r1.ebuild

@@ -0,0 +1,63 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# autotools for Clang 15 configure patch
+inherit autotools multilib-minimal #libtool
+
+MY_P="gc-${PV}"
+
+DESCRIPTION="The Boehm-Demers-Weiser conservative garbage collector"
+HOMEPAGE="https://www.hboehm.info/gc/ https://github.com/ivmai/bdwgc/"
+SRC_URI="https://github.com/ivmai/bdwgc/releases/download/v${PV}/${MY_P}.tar.gz"
+S="${WORKDIR}/${MY_P}"
+
+LICENSE="boehm-gc"
+# SONAME: libgc.so.1 libgccpp.so.1
+# We've been using subslot 0 for these instead of "1.1".
+SLOT="0"
+# Upstream marked this version as "Pre-release"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE="cxx +large static-libs +threads"
+
+RDEPEND=">=dev-libs/libatomic_ops-7.4[${MULTILIB_USEDEP}]"
+DEPEND="${RDEPEND}"
+BDEPEND="virtual/pkgconfig"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-8.2.2-clang-15-configure.patch
+)
+
+src_prepare() {
+	default
+
+	# bug #594754
+	#elibtoolize
+
+	eautoreconf
+}
+
+multilib_src_configure() {
+	local config=(
+		--disable-docs
+		--with-libatomic-ops
+		$(use_enable cxx cplusplus)
+		$(use_enable static-libs static)
+		$(use threads || echo --disable-threads)
+		$(use_enable large large-config)
+	)
+
+	ECONF_SOURCE="${S}" econf "${config[@]}"
+}
+
+multilib_src_install_all() {
+	local HTML_DOCS=( doc/*.md )
+	einstalldocs
+	dodoc doc/README{.environment,.linux,.macros}
+
+	# Package provides .pc files
+	find "${ED}" -name '*.la' -delete || die
+
+	newman doc/gc.man GC_malloc.1
+}

dev-libs/boehm-gc/files/boehm-gc-8.2.2-clang-15-configure.patch

@@ -0,0 +1,43 @@
+https://github.com/ivmai/bdwgc/pull/474
+
+From b3428e52cb9af18d6c85d0027b9c86e9b44e2e4f Mon Sep 17 00:00:00 2001
+From: Sam James <sam@gentoo.org>
+Date: Tue, 13 Sep 2022 19:37:59 +0100
+Subject: [PATCH] Fix configure with Clang 15 (implicit function declarations)
+
+Clang 15 makes implicit function declarations an error by default
+which leads to configure falsely thinking `pthread_setname_np` is
+not present:
+```
+checking for pthread_setname_np... no
+```
+
+This fixes that issue and the following errors:
+```
+error: call to undeclared function 'pthread_setname_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+error: call to undeclared function 'pthread_setname_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+```
+
+Signed-off-by: Sam James <sam@gentoo.org>
+--- a/configure.ac
++++ b/configure.ac
+@@ -834,12 +834,16 @@ AS_IF([test "$THREADS" = posix],
+   [AC_MSG_CHECKING(for pthread_setname_np)
+    old_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS $CFLAGS_EXTRA -Werror"
+-   AC_TRY_COMPILE([#include <pthread.h>],
++   AC_TRY_COMPILE([
++#define _GNU_SOURCE 1
++#include <pthread.h>],
+                   [pthread_setname_np("thread-name")],
+      [AC_MSG_RESULT([yes (w/o tid)])
+       AC_DEFINE([HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID], [1],
+                 [Define to use 'pthread_setname_np(const char*)' function.])],
+-     [AC_TRY_COMPILE([#include <pthread.h>],
++     [AC_TRY_COMPILE([
++#define _GNU_SOURCE 1
++#include <pthread.h>],
+                      [pthread_setname_np(pthread_self(), "thread-name-%u", 0)],
+        [AC_MSG_RESULT([yes (with tid and arg)])
+         AC_DEFINE([HAVE_PTHREAD_SETNAME_NP_WITH_TID_AND_ARG], [1],
+