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This patch enables building gcc-4.6.4 using gcc-2.95.3 and glibc-2.2.5
* Tweak Makefile to allow overriding NATIVE_SYSTEM_HEADER_DIR using #:makeflags
* Add missing limits.h include.
* Add SSIZE_MAX define. The SSIZE_MAX define has been added to Mes
upstream and can be removed with the next Mes release.
* Remove -fbuilding-libgcc flag, it assumes features being present from a
newer gcc or glibc.
* [MES_BOOTSTRAP_GCC]: Disable threads harder.
Upstream status: not presented upstream.
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index f3cc49fdb18..bc5718fc9a6 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -440,7 +440,7 @@ LINKER_PLUGIN_API_H = $(srcdir)/../include/plugin-api.h
LTO_SYMTAB_H = $(srcdir)/../include/lto-symtab.h
# Default native SYSTEM_HEADER_DIR, to be overridden by targets.
-NATIVE_SYSTEM_HEADER_DIR = /usr/include
+# NATIVE_SYSTEM_HEADER_DIR = /usr/include
# Default cross SYSTEM_HEADER_DIR, to be overridden by targets.
CROSS_SYSTEM_HEADER_DIR = @CROSS_SYSTEM_HEADER_DIR@
diff --git a/gcc/config/host-linux.c b/gcc/config/host-linux.c
index 94b7a0b89a7..ab2baab55ca 100644
--- a/gcc/config/host-linux.c
+++ b/gcc/config/host-linux.c
@@ -23,6 +23,12 @@
#include "hosthooks.h"
#include "hosthooks-def.h"
+// ../.././gcc/config/host-linux.c:213: `SSIZE_MAX' undeclared (first
+// use in this function)
+#include <limits.h>
+#ifndef SSIZE_MAX
+# define SSIZE_MAX LONG_MAX
+#endif
/* Linux has a feature called exec-shield-randomize that perturbs the
address of non-fixed mapped segments by a (relatively) small amount.
diff --git a/libgcc/generic-morestack-thread.c b/libgcc/generic-morestack-thread.c
index bbe6dd12b5a..1d1d48223d7 100644
--- a/libgcc/generic-morestack-thread.c
+++ b/libgcc/generic-morestack-thread.c
@@ -34,7 +34,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
will want to define inhibit_libc while building a compiler which
can build glibc. */
-#ifndef inhibit_libc
+#if 0 //!defined (inhibit_libc) && !MES_BOOTSTRAP_GCC
#include <errno.h>
#include <pthread.h>
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