On the first computer, I recompile libxml2 "dynamically" : ./configure --prefix=/.../software/libxml2-2.7.8 --disable-static make make install now : $ xml2-config --libs -L/.../software/libxml2-2.7.8/lib -lxml2 -lm $ xml2-config --cflags -I/.../software/libxml2-2.7.8/include/libxml2 $ ls /.../software/libxml2-2.7.8/lib libxml2.la libxml2.so libxml2.so.2 libxml2.so.2.7.8 pkgconfig xml2Conf.h But always the same problem : $ gcc `xml2-config --libs` `xml2-config --cflags` src/main.c /tmp/ccXlXfPu.o: In function `parseDoc': ... I try with the -Wl and -t : $ gcc -Wall -Wextra `xml2-config --cflags` `xml2-config --libs` -Wl -t -o xmlparsefile xmlparsefile-main.o /usr/bin/ld: mode elf_i386 /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/crt1.o /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/crti.o /usr/lib/gcc/i686-linux-gnu/4.6.1/crtbegin.o -lxml2 (/auto/pierre/software/libxml2-2.7.8/lib/libxml2.so) -lm (/usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so) xmlparsefile-main.o -lgcc_s (/usr/lib/gcc/i686-linux-gnu/4.6.1/libgcc_s.so) /lib/i386-linux-gnu/libc.so.6 (/usr/lib/i386-linux-gnu/libc_nonshared.a)elf-init.oS /lib/i386-linux-gnu/ld-linux.so.2 -lgcc_s (/usr/lib/gcc/i686-linux-gnu/4.6.1/libgcc_s.so) /usr/lib/gcc/i686-linux-gnu/4.6.1/crtend.o /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/crtn.o xmlparsefile-main.o: In function `parseDoc': main.c:(.text+0xd): undefined reference to `xmlParseFile' main.c:(.text+0x51): undefined reference to `xmlCleanupParser' main.c:(.text+0x63): undefined reference to `xmlFreeDoc' main.c:(.text+0x68): undefined reference to `xmlCleanupParser' /usr/bin/ld: link errors found, deleting executable `xmlparsefile' collect2: ld returned 1 exit status The order was automatically determined by my autotools (autoconf and automake). I think there are in the good order. Do you have any other idea to resolve this problem? Thank you. ----- Mail original ----- De: "Ryan Mansfield" <rmansfield@xxxxxxx> À: gcc-help@xxxxxxxxxxx Envoyé: Mercredi 15 Février 2012 15:49:04 Objet: Re: The order of arguments differs On 12-02-15 09:41 AM, spam.spam.spam.spam@xxxxxxx wrote: > Hello, > > I am compiling a program on 2 computers. > > Table of contents > 1. First computer > 2. Second computer > 3. Conclusion > > 1. First computer > > $ gcc src/main.c `xml2-config --libs` `xml2-config --cflags` > > Now with a different order of arguments : > $ gcc `xml2-config --libs` `xml2-config --cflags` src/main.c > /tmp/ccXlXfPu.o: In function `parseDoc': > 3. Conclusion > > It's a big problem to have a different behaviour on each computer. You're likely linking statically against libxml2 on the first computer, and dynamically on the second. Check with -Wl,-t. Link order matters when statically linking; the reference always has to come before the symbol definition (unless you use -start-group/--end-group to have ld make a second pass) > Do you think it's a gcc problem? No. Regards, Ryan Mansfield
