https://sourceware.org/bugzilla/show_bug.cgi?id=19019
Michael Karcher <sourceware-bugzilla at mkarcher dot dialup.fu-berlin.de>
changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ian at airs dot com,
| |sourceware-bugzilla@mkarche
| |r.dialup.fu-berlin.de
Component|binutils |gold
Assignee|unassigned at sourceware dot org |ccoutant at gmail dot
com
--- Comment #9 from Michael Karcher <sourceware-bugzilla at mkarcher dot
dialup.fu-berlin.de> ---
With access to a Debian build box, I found out that the broken shared library
is created by LTO-linking with gold. The invocation is basically the following
gcc command.
gcc -shared -fPIC $(OBJECTS) -flto -O2 -Wl,--gc-sections -Wl,--as-needed -Wl,-z
-Wl,relro -Wl,-z -Wl,now -Wl,-fuse-ld=gold
-Wl,--version-script=../src/libsystemd/libsystemd.sym -Wl,-z -Wl,relro
-pthread -Wl,-soname -Wl,libsystemd.so.0 -o .libs/libsystemd.so.0.11.0
If I omit "-Wl,-fuse-ld=gold", I obtain a correct libsystemd.so.0.11.0:
$ readelf -s .libs/libsystemd.so.0.11.0 | grep REGISTER
4: 0000000000000002 0 REGISTER GLOBAL DEFAULT UND
5: 0000000000000003 0 REGISTER GLOBAL DEFAULT UND
2007: 0000000000000002 0 REGISTER GLOBAL DEFAULT UND
2008: 0000000000000003 0 REGISTER GLOBAL DEFAULT UND
Using gcc --save-temps, I obtained the LTO-generated assembler files, assembled
them using
as -s -K PIC -Av9 -64 -no-undeclared-regs -relax -o $x.o $x
objdumping those files shows only REGISTER declarations for %g2 and %g3, which
seem fine, linking them with gold results in a broken output file. I will
attach the object files.
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