From owner-freebsd-ports Sun Apr 11 0:11:59 1999 Delivered-To: freebsd-ports@freebsd.org Received: from dominator.eecs.harvard.edu (dominator.eecs.harvard.edu [140.247.60.28]) by hub.freebsd.org (Postfix) with SMTP id 8ADA315414 for ; Sun, 11 Apr 1999 00:11:53 -0700 (PDT) (envelope-from karp@eecs.harvard.edu) Received: (from karp@localhost) by dominator.eecs.harvard.edu (8.6.12/8.6.12) id DAA12115 for freebsd-ports@freebsd.org; Sun, 11 Apr 1999 03:09:39 -0400 Date: Sun, 11 Apr 1999 03:09:39 -0400 From: Brad Karp Message-Id: <199904110709.DAA12115@dominator.eecs.harvard.edu> To: freebsd-ports@freebsd.org Subject: egcs-1.1.2 shared library linking bummage Sender: owner-freebsd-ports@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-ports" in the body of the message