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Some notes on the 'bootstrap with or without libc headers' debate:
http://linuxfromscratch.org/pipermail/lfs-dev/2005-July/052409.html
http://gcc.gnu.org/ml/gcc/2005-07/msg01195.html
--- gcc/config/sh/linux.h
+++ gcc/config/sh/linux.h
@@ -145,6 +145,7 @@
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
+#ifndef inhibit_libc
#ifdef IN_LIBGCC2
#include <signal.h>
#include <sys/ucontext.h>
@@ -295,6 +296,7 @@
#endif /* defined (__SH5__) */
#endif /* IN_LIBGCC2 */
+#endif /* inhibit_libc */
/* For SH3 and SH4, we use a slot of the unwind frame which correspond
to a fake register number 16 as a placeholder for the return address
--- gcc/config/i386/linux.h
+++ gcc/config/i386/linux.h
@@ -208,6 +208,7 @@
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
+#ifndef inhibit_libc
#ifdef IN_LIBGCC2
/* There's no sys/ucontext.h for some (all?) libc1, so no
signal-turned-exceptions for them. There's also no configure-run for
@@ -272,3 +273,4 @@
} while (0)
#endif /* not USE_GNULIBC_1 */
#endif /* IN_LIBGCC2 */
+#endif /* inhibit_libc */
--- gcc/config/alpha/linux.h
+++ gcc/config/alpha/linux.h
@@ -73,6 +73,7 @@
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
+#ifndef inhibit_libc
#ifdef IN_LIBGCC2
#include <signal.h>
#include <sys/ucontext.h>
@@ -122,3 +123,4 @@
(FS)->retaddr_column = 64; \
goto SUCCESS; \
} while (0)
+#endif /* inhibit_libc */
--- gcc/config.gcc
+++ gcc/config.gcc
@@ -321,7 +321,7 @@
need_64bit_hwint=yes
;;
# Note the 'l'; we need to be able to match e.g. "shle" or "shl".
-sh[123456789l]*-*-*)
+sh[123456789lbe]*-*-*)
cpu_type=sh
need_64bit_hwint=yes
;;
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