Bug 725516
| Summary: | gcc-4.6.1-3.fc16.x86_64 large O2 error: immediate operand illegal with absolute jump | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Mads Kiilerich <mads> |
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | rawhide | CC: | jakub |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | gcc-4.6.1-7.fc16 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-07-27 13:21:29 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
s/ with -mcmodel=large / without -mcmodel=large / Tracking upstream. Why does grub use -mcmodel=large, out of curiosity? It seems to be assumed that it is required for 64bit EFI. I'm sure mjg59 know the details.
configure.ac:
if test "$target_cpu"-"$platform" = x86_64-efi; then
# Use large model to support 4G memory
AC_CACHE_CHECK([whether option -mcmodel=large works], grub_cv_cc_mcmodel, [
SAVED_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS -m64 -mcmodel=large"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_cc_mcmodel=yes],
[grub_cv_cc_mcmodel=no])
])
if test "x$grub_cv_cc_mcmodel" = xno; then
AC_MSG_ERROR([-mcmodel=large not supported. Upgrade your gcc.])
else
TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=large"
fi
grub-core/Makefile.am :
efiemu64_c.o: efiemu/runtime/efiemu.c
$(TARGET_CC) $(DEFS) $(INCLUDES) $(CPPFLAGS_EFIEMU) $(CPPFLAGS_DEFAULT) -DELF64 -m64 -nostdlib -Wall -Werror -O2 -mcmodel=large -mno-red-zone -c -o $@ $< || exit 1; \
efiemu64_s.o: efiemu/runtime/efiemu.S
$(TARGET_CC) $(DEFS) $(INCLUDES) $(CPPFLAGS_EFIEMU) $(CPPFLAGS_DEFAULT) -DELF64 -m64 -Wall -Werror -nostdlib -O2 -mcmodel=large -mno-red-zone -c -o $@ $< || exit 1; \
(Grub has a lot of compile flags hardcoded. Some of them probably for good reasons, but it causes trouble when it is combined with standard rpm CFLAGS.)
gcc-4.6.1-4.fc16 has been submitted as an update for Fedora 16. https://admin.fedoraproject.org/updates/gcc-4.6.1-4.fc16 gcc-4.6.1-7.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report. |
While trying to update grub2 to grub-1.99 on x86_64 I got an assembler error which I reduced to the following. The original test case had no warnings and compiles without problems without O2 or with -mcmodel=large - and thus also on 32-bit. $ cat test.c static f0 (struct s *ps, int n) { int i; for (i = 0; i < n; i++) { b (ps, c (), i); } } f (int p1, int edit, int n, struct s *ps) { x (p1); f0 (ps, n); x (p1); } $ gcc -mcmodel=large -O2 -c test.c test.c:1:19: warning: ‘struct s’ declared inside parameter list [enabled by default] test.c:1:19: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default] test.c:9:36: warning: ‘struct s’ declared inside parameter list [enabled by default] test.c: In function ‘f’: test.c:12:3: warning: passing argument 1 of ‘f0’ from incompatible pointer type [enabled by default] test.c:1:8: note: expected ‘struct s *’ but argument is of type ‘struct s *’ test.s: Assembler messages: test.s:70: Error: immediate operand illegal with absolute jump gcc-4.6.1-3.fc16.x86_64 gcc (GCC) 4.6.1 20110715 (Red Hat 4.6.1-3)