https://sourceware.org/bugzilla/show_bug.cgi?id=19576
Bug ID: 19576
Summary: bogus code generation with on SunOS with 2.26
Product: binutils
Version: 2.26
Status: NEW
Severity: critical
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: richard at netbsd dot org
Target Milestone: ---
Created attachment 8958
--> https://sourceware.org/bugzilla/attachment.cgi?id=8958&action=edit
intermediate assembler file
Having applied the patch for gas/19520 backported to 2.26 release tarball
and used with pkgsrc gcc49, I'm noticing issues when building either pkgsrc
modular-xorg-server or modular-xorg-xephyr 1.18.0 on SunOS 5.11 (illumos
distribution OmniOS) 32-bit i386 with dtrace enabled
With gas from binutils 2.25.1 things build just fine.
The symptom is the following during link (with sun linker):
> CCLD Xorg
> Undefined first referenced
> symbol in file
> ree ../../dix/dix.O
> ld: fatal: symbol referencing errors. No output written to Xorg
> collect2: error: ld returned 1 exit status
after digging in to see the problem, I was able to isolate the issue with the
module dix/resource.c, setting '-save-temps -v'.
The intermediates (.i and .s) are, as hoped, identical in the test runs,
only the generated .o is different.
listing the symbols from the 'bad' file:
gnm -lug .libs/resource.o
U __assert_c99 resource.c:0
U _CallCallbacks resource.c:0
U _GLOBAL_OFFSET_TABLE_ resource.c:0
U clients resource.c:0
U CloseFont
U currentMaxClients resource.c:0
U DeletePassiveGrab
U DeleteWindow
U dixDestroyPixmap
U ErrorF resource.c:0
U FatalError resource.c:0
U FreeClientPixels
U FreeColormap
U FreeCursor
U FreeGC
U HandleSaveSet resource.c:0
U LimitClients resource.c:0
U LookupResourceName resource.c:0
U malloc resource.c:0
U MarkClientException resource.c:0
U NoopDDA
U noPanoramiXExtension resource.c:0
U OtherClientGone
U ree resource.c:0
U RegisterResourceName resource.c:0
U serverClient resource.c:0
U XaceHook resource.c:0
U xreallocarray resource.c:0
which differs from the 'good' one generated with 2.25.1 only with 'free()':
12d11
< U free resource.c:0
24a24
> U ree resource.c:0
disabling dtrace fixes the problem.
To note, dtrace generates symbols of the sort:
grep dtrace resource.s
call __dtrace_Xserver___resource__alloc@PLT
call __dtrace_Xserver___resource__free@PLT
call __dtrace_Xserver___resource__free@PLT
call __dtrace_Xserver___resource__free@PLT
call __dtrace_Xserver___resource__free@PLT
I add the .s file for info
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