Linking to pthread library: undefined reference
Frank Behrens
frank at pinky.sax.de
Fri Jun 15 17:14:20 UTC 2007
Hi,
I could not find any information in the developers handbook, so I ask here for support.
I try to link an milter (sendmail mail filter) test application and get an error I do not
understand. I use FreeBSD 6.2-STABLE-200705211513 with an userland from May-03.
In my Makefile I have:
CFLAGS+= -I/usr/local/include -std=c99 -pthread -v
LDADD+= -L/usr/local/lib -lmilter
This gives linker command:
cc -O2 -pipe -fno-strict-aliasing -march=pentium4 -I/usr/local/include -std=c99 -pthread -v -g -
DDEBUG=1 -O1 -fno-omit-frame-pointer -Wsystem-headers -Wall -Wno-format-y2k -W -
Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-
type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter -
Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -o fmilter fmilter.o -
L/usr/local/lib -lmilter
Using built-in specs.
Configured with: FreeBSD/i386 system compiler
Thread model: posix
gcc version 3.4.6 [FreeBSD] 20060305
/usr/bin/ld -V -dynamic-linker /libexec/ld-elf.so.1 -o fmilter /usr/lib/crt1.o /usr/lib/crti.o
/usr/lib/crtbegin.o -L/usr/local/lib -L/usr/lib fmilter.o -lmilter -lgcc -lpthread -lc -lgcc
/usr/lib/crtend.o /usr/lib/crtn.o
GNU ld version 2.15 [FreeBSD] 2004-05-23
Supported emulations:
elf_i386_fbsd
/usr/lib/libmilter.so: undefined reference to `pthread_detach'
In my opinion the symbol should be found in
/usr/lib/libpthread.so@ -> /lib/libpthread.so.2
When I look into the libraries I see
> objdump -T /usr/lib/libmilter.so | fgrep detach
00000000 D *UND* 00000000 pthread_detach
> objdump -T /usr/lib/libpthread.so | fgrep pthread_detach
000077d4 w DF .text 000003a4 LIBTHREAD_1_0 pthread_detach
000077d4 g DF .text 000003a4 LIBTHREAD_1_0 _pthread_detach
Did I make something wrong? I guess yes, but what?
Thanks for your help and best regards,
Frank
--
Frank Behrens, Osterwieck, Germany
PGP-key 0x5B7C47ED on public servers available.
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