sys-devel/gcc-14.2.0: fix interoperability with Clang 16's as

Sequoia comes with Clang 16 which requires explicitness for reading from
pipe

Signed-off-by: Fabian Groffen <[email protected]>

Author: grobian

sys-devel/gcc/files/gcc-14.2.0-darwin-as-dash-pipe.patch

@@ -0,0 +1,14 @@
+Since Sequoia with Clang 16, as needs - when used via pipe input
+
+--- a/gcc/config/darwin.h
++++ b/gcc/config/darwin.h
+@@ -977,6 +977,9 @@
+   { "weak_import", 0, 0, true, false, false, false,			     \
+     darwin_handle_weak_import_attribute, NULL }
+ 
++/* Since clang 16 called as 'as', it requires a dash to read pipe */
++#define AS_NEEDS_DASH_FOR_PIPED_INPUT
++
+ /* Make local constant labels linker-visible, so that if one follows a
+    weak_global constant, ld64 will be able to separate the atoms.  */
+ #undef ASM_GENERATE_INTERNAL_LABEL

sys-devel/gcc/gcc-14.2.0.ebuild

@@ -46,6 +46,9 @@ src_prepare() {
 	# apply big arm64-darwin patch first thing
 	use elibc_Darwin && eapply "${DISTDIR}"/${P}-arm64-darwin.patch
 
+	# run as with - on pipe (for Clang 16)
+	eapply "${FILESDIR}"/${PN}-14.2.0-darwin-as-dash-pipe.patch
+
 	# make sure 64-bits native targets don't screw up the linker paths
 	eapply "${FILESDIR}"/gcc-12-no-libs-for-startfile.patch
 
@@ -57,7 +60,7 @@ src_prepare() {
 	done
 
 	toolchain_src_prepare
-	#
+
 	# make it have correct install_names on Darwin
 	eapply -p1 "${FILESDIR}"/4.3.3/darwin-libgcc_s-installname.patch