a

Author: Kartatz

build.sh

@@ -645,6 +645,7 @@ if ! [ -f "${gcc_tarball}" ]; then
 		patch --directory="${gcc_directory}" --strip='1' --input="${workdir}/patches/gcc-2.9/0004-libiberty-hide-sys_nerr-from-system-headers-in-strerror.patch"
 		patch --directory="${gcc_directory}" --strip='1' --input="${workdir}/patches/gcc-2.9/0005-libiberty-hide-sys_nsig-from-system-headers-in-strsignal.patch"
 		patch --directory="${gcc_directory}" --strip='1' --input="${workdir}/patches/gcc-2.9/0006-gcc-drop-unused-sys-dir.h-include-from-protoize.patch"
+		patch --directory="${gcc_directory}" --strip='1' --input="${workdir}/patches/gcc-2.9/0007-gcc-also-set-POSIX-xm_defines-for-Android-hosts.patch"
 	fi
 
 	if (( gcc_major == 11 )); then

patches/gcc-2.9/0007-gcc-also-set-POSIX-xm_defines-for-Android-hosts.patch

@@ -0,0 +1,54 @@
+From 528470c4ab4919e4d90b58f421bf0a8db8a684e1 Mon Sep 17 00:00:00 2001
+From: Kartatz <105828205+Kartatz@users.noreply.github.com>
+Date: Sun, 9 Aug 2026 19:18:37 +0000
+Subject: [PATCH] gcc: also set POSIX xm_defines for Android hosts
+
+The second pass of the cpu_type loop registers HAVE_ATEXIT/POSIX/BSTRING
+for hosts whose triple matches "*-*-linux-gnu*".  Android host triples
+are "*-*-linux-android*" (e.g. aarch64-unknown-linux-android21), so they
+slipped through this case and POSIX was left undefined for the build/host.
+Code like protoize.c then took the non-POSIX branch (using the
+<sys/dir.h> include that bionic does not provide), breaking the build.
+
+Extend the pattern to also match "*-*-linux-android*", treating Android
+like the other GNU/Linux hosts it shares a POSIX kernel interface with.
+---
+ gcc/configure    | 4 ++--
+ gcc/configure.in | 4 ++--
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/gcc/configure b/gcc/configure
+index 9810e80..82a0642 100755
+--- a/gcc/configure
++++ b/gcc/configure
+@@ -2962,9 +2962,9 @@ for machine in $build $host $target; do
+ 	tm_file=${cpu_type}/${cpu_type}.h
+ 	xm_file=${cpu_type}/xm-${cpu_type}.h
+ 	
+-	# Common parts for linux-gnu and openbsd systems
++	# Common parts for Linux (glibc/Android) and openbsd systems
+ 	case $machine in
+-	*-*-linux-gnu*)
++	*-*-linux-gnu* | *-*-linux-android*)
+ 		xm_defines="HAVE_ATEXIT POSIX BSTRING"
+ 		;;
+ 	*-*-openbsd*)
+diff --git a/gcc/configure.in b/gcc/configure.in
+index b177082..79ace1f 100644
+--- a/gcc/configure.in
++++ b/gcc/configure.in
+@@ -528,9 +528,9 @@ changequote([,])dnl
+ 	tm_file=${cpu_type}/${cpu_type}.h
+ 	xm_file=${cpu_type}/xm-${cpu_type}.h
+ 	
+-	# Common parts for linux-gnu and openbsd systems
++	# Common parts for Linux (glibc/Android) and openbsd systems
+ 	case $machine in
+-	*-*-linux-gnu*)
++	*-*-linux-gnu* | *-*-linux-android*)
+ 		xm_defines="HAVE_ATEXIT POSIX BSTRING"
+ 		;;
+ 	*-*-openbsd*)
+-- 
+2.54.0
+