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NEED_REGISTER_FRAME_INFO can be replaced by -static-libgcc

From: Christian Franke
Subject: NEED_REGISTER_FRAME_INFO can be replaced by -static-libgcc
Date: Tue, 13 Apr 2010 21:10:01 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100205 SeaMonkey/2.0.3


a note regarding this fix:

2010-04-11  Vladimir Serbinenko <...>

        Fix cygwin compilation.

        * include/grub/misc.h (__register_frame_info)
        [NEED_REGISTER_FRAME_INFO && !UTIL]: New export.
(__deregister_frame_info) [NEED_REGISTER_FRAME_INFO && !UTIL]: Likewise.
        * kern/misc.c (__register_frame_info)
        [NEED_REGISTER_FRAME_INFO && !UTIL]: New empty function.
(__deregister_frame_info) [NEED_REGISTER_FRAME_INFO && !UTIL]: Likewise.

---    2010-04-11 14:14:51 +0000
+++    2010-04-12 14:58:44 +0000
@@ -376,7 +376,11 @@
 # For platforms where ELF is not the default link format.
 AC_MSG_CHECKING([for command to convert module to ELF format])
 case "${host_os}" in
-  cygwin) TARGET_OBJ2ELF='grub-pe2elf' ;;
+  cygwin) TARGET_OBJ2ELF='grub-pe2elf';
+# FIXME: put proper test here
+        [Define to 1 if GCC generates calls to __register_frame_info()])
+  ;;
   *) ;;

The *_frame_info symbols are set undefined to force linkage of the libgcc_s shared library or dll.

This can be prevented by TARGET_LDFLAGS=-static-libgcc. To build from grub-1.98 tarball on Cygwin, run configure with this argument.

May also be necessary on other build platforms when -shared-libgcc is the default. It may be possible simply set -static-libgcc unconditionally.

Christian Franke

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