Date: Sun, 11 Apr 1999 03:09:39 -0400 From: Brad Karp <karp@eecs.harvard.edu> To: freebsd-ports@freebsd.org Subject: egcs-1.1.2 shared library linking bummage Message-ID: <199904110709.DAA12115@dominator.eecs.harvard.edu>
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I run FreeBSD 3.1-RELEASE, with a /usr/ports updated to that of 4/8/99.
I built the egcs-1.1.2 port as of 4/10/99, and the build and resulting
compiler were fine, or so I thought, until I tried using egcc to produce
shared libraries and link against those shared libraries.
Say I have a function bar() defined in bar.c, and I compile bar.c into a
shared library, libbar.so, using egcc:
egcc -shared -fPIC -DPIC -Wl,-h -Wl,libbar.so -o libbar.so bar.c
Then say I have main() in foo.c, and main() calls bar(). I build the
executable foo as follows:
egcc -o foo foo.c -L`pwd` -lbar
The link goes fine, and an executable foo is created. I set my
LD_LIBRARY_PATH to include `pwd`, and run foo, but I get the error:
/usr/libexec/ld-elf.so.1: /usr/home/karp/egcs-bug/libbar.so: Undefined symbol "__deregister_frame_info"
After some sleuthing by adding the -v option to the above egcc commmand
lines, and nm'ing around in
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/,
where the egcc-specific .o files and libgcc.a live, I've learned:
- {crtbegin,crtbeginS,crtend,crtendS}.o all contain an unresolved
reference to __register_frame_info and __deregister_frame_info
- libgcc.a contains text for these functions
- the build of foo *does* link against libgcc.a, so it *should*
bring in these *_frame_info functions successfuly...but it
doesn't
- explicitly adding -lgcc to the end of the link line doesn't help
- extracting the .o file (frame.o) that defines *_frame_info in
egcc's libgcc.a, and manually including it in the link successfully
includes the text for these functions in the executable
- the output of egcc -v -Wl,--verbose shows that the proper libgcc.a
is being used (i.e., not the old 2.7.2.1 libgcc.a, which doesn't
have these frame_info functions...this was the first explanation I
[wrongly] seized on)
Even compiling a one-line "hello, world" program (no shared libraries of my
construction involved) with egcc gives an executable with these *_frame_info
symbols unresolved. However, the run-time loader doesn't complain when I run
that executable--only when I run one linked against a shared library I've
created myself, as above.
Does anyone else see similar behavior? Better still, does anyone have a fix?
I'm not a regular reader of the the ports mailing list, so if you could cc
your reply to me directly, that'd be great. Thanks!
Here are the exact files I use to demonstrate this behavior on my system:
bar.c
-----
#include <stdio.h>
void bar(void)
{
printf("hello, world.\n");
}
foo.c
-----
main(int argc, char **argv)
{
bar();
}
Here is a transcript of the behavior I see:
[dominatrix 119] egcc -v -c -fPIC -DPIC bar.c
Reading specs from /usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/cpp -lang-c -v -undef -D__GNUC__=2 -D__GNUC_MINOR__=91 -Di386 -D__ELF__ -Dunix -D__FreeBSD__=3 -D__i386__ -D__ELF__ -D__unix__ -D__FreeBSD__=3 -D__i386 -D__unix -Acpu(i386) -Amachine(i386) -Asystem(unix) -Asystem(FreeBSD) -Asystem(unix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -D__PIC__ -D__pic__ -DPIC bar.c /var/tmp/ccQvcCix.i
GNU CPP version egcs-2.91.66 19990314 (egcs-1.1.2 release) (i386 FreeBSD/ELF)
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/local/i386-portbld-freebsd3.1/include
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/include
/usr/include
End of search list.
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/cc1 /var/tmp/ccQvcCix.i -quiet -dumpbase bar.c -version -fPIC -o /var/tmp/ccAvmCzW.s
GNU C version egcs-2.91.66 19990314 (egcs-1.1.2 release) (i386-portbld-freebsd3.1) compiled by GNU C version egcs-2.91.66 19990314 (egcs-1.1.2 release).
as -V -Qy -o bar.o /var/tmp/ccAvmCzW.s
GNU assembler version 2.9.1 (i386-unknown-freebsdelf), using BFD version 2.9.1
[dominatrix 120] egcc -v -shared -Wl,-h -Wl,libbar.so -o libbar.so bar.o
Reading specs from /usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/collect2 -m elf_i386 -shared -o libbar.so /usr/lib/crti.o /usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/crtbeginS.o -L/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66 -L/usr/local/i386-portbld-freebsd3.1/lib -L/usr/local/lib -h libbar.so bar.o -lgcc -lgcc /usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/crtendS.o /usr/lib/crtn.o
[dominatrix 122] setenv LD_LIBRARY_PATH `pwd`':'$LD_LIBRARY_PATH
[dominatrix 124] egcc -v -o foo foo.c -L. -lbar
Reading specs from /usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/cpp -lang-c -v -undef -D__GNUC__=2 -D__GNUC_MINOR__=91 -Di386 -D__ELF__ -Dunix -D__FreeBSD__=3 -D__i386__ -D__ELF__ -D__unix__ -D__FreeBSD__=3 -D__i386 -D__unix -Acpu(i386) -Amachine(i386) -Asystem(unix) -Asystem(FreeBSD) -Asystem(unix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ foo.c /var/tmp/cc8XhqFr.i
GNU CPP version egcs-2.91.66 19990314 (egcs-1.1.2 release) (i386 FreeBSD/ELF)
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/local/i386-portbld-freebsd3.1/include
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/include
/usr/include
End of search list.
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/cc1 /var/tmp/cc8XhqFr.i -quiet -dumpbase foo.c -version -o /var/tmp/ccCqek7J.s
GNU C version egcs-2.91.66 19990314 (egcs-1.1.2 release) (i386-portbld-freebsd3.1) compiled by GNU C version egcs-2.91.66 19990314 (egcs-1.1.2 release).
as -V -Qy -o /var/tmp/cc2aJaT4.o /var/tmp/ccCqek7J.s
GNU assembler version 2.9.1 (i386-unknown-freebsdelf), using BFD version 2.9.1
/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/collect2 -m elf_i386 -dynamic-linker /usr/libexec/ld-elf.so.1 -o foo /usr/lib/crt1.o /usr/lib/crti.o /usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/crtbegin.o -L. -L/usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66 -L/usr/local/i386-portbld-freebsd3.1/lib -L/usr/local/lib /var/tmp/cc2aJaT4.o -lbar -lgcc -lc -lgcc /usr/local/lib/gcc-lib/i386-portbld-freebsd3.1/egcs-2.91.66/crtend.o /usr/lib/crtn.o
[dominatrix 125] ./foo
/usr/libexec/ld-elf.so.1: /usr/home/karp/egcs-bug/libbar.so: Undefined symbol "__deregister_frame_info"
-Brad, karp@eecs.harvard.edu
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