On Fri, Feb 17, 2012 at 01:12:04PM +0100, spam.spam.spam.s...@free.fr wrote: > Indeed, I don't know this option. > But, if I use it in my Makefile.am: > bin_PROGRAMS = xmlparsefile > xmlparsefile_SOURCES = main.c > xmlparsefile_LIBS = `xml2-config --libs` > xmlparsefile_CFLAGS = -Wall -Wextra `xml2-config --cflags` > > The compile does now : > $ gcc -DPACKAGE_NAME=\"xmlparsefile\" -DPACKAGE_TARNAME=\"xmlparsefile\" > -DPACKAGE_VERSION=\"0.1\" -DPACKAGE_STRING=\"xmlparsefile\ 0.1\" > -DPACKAGE_BUGREPORT=\"samson.pie...@etud.univ-montp2.fr\" -DPACKAGE_URL=\"\" > -DPACKAGE=\"xmlparsefile\" -DVERSION=\"0.1\" -I. -Wall -Wextra > `xml2-config --cflags` -g -O2 -MT xmlparsefile-main.o -MD -MP -MF > .deps/xmlparsefile-main.Tpo -c -o xmlparsefile-main.o `test -f 'main.c' || > echo './'`main.c > mv -f .deps/xmlparsefile-main.Tpo .deps/xmlparsefile-main.Po > > So, it does something like this : > $ gcc -Wall -Wextra `xml2-config --cflags` main.c > > And I got the same error. > > The "`xml2-config --libs`" has completely disappeared. > > Are you sure about _LIBS option?
Oh sorry... it is _LDADD. Christian > ----- Mail original ----- > De: "Christian Engwer" <christian.eng...@uni-muenster.de> > À: "spam spam spam spam" <spam.spam.spam.s...@free.fr> > Cc: xml@gnome.org > Envoyé: Vendredi 17 Février 2012 12:42:41 > Objet: Re: [xml] The order of arguments when compiling > > Hi, > > > xmlparsefile_SOURCES = main.c > > xmlparsefile_LDFLAGS = `xml2-config --libs` > > are you aware of the LIBS option? > > xmlparsefile_LIBS = ... > > This should allow for the approriate ordering. > > Christian > > > xmlparsefile_CFLAGS = -Wall -Wextra `xml2-config --cflags` > > > > I think it's strange that GNU Automake do this choice if this is not > > compatible with most Unix linkers... > > > > I will ask the GNU Automake mailing list to know if there is a way to set a > > different argument order than the default. > > > > Any other suggestion is welcome. > > > > ----- Mail original ----- > > De: "Csaba Raduly" <rcs...@gmail.com> > > À: "spam spam spam spam" <spam.spam.spam.s...@free.fr> > > Cc: xml@gnome.org > > Envoyé: Vendredi 17 Février 2012 09:55:52 > > Objet: Re: [xml] The order of arguments when compiling > > > > Hi spam, > > > > On Thu, Feb 16, 2012 at 4:01 PM, wrote: > > > Hello, > > > > > > On a first computer, when I compile a C program using the libxml2 library > > > I do : > > > $ gcc `xml2-config --cflags` `xml2-config --libs` main.c > > > or > > > $ gcc main.c `xml2-config --cflags` `xml2-config --libs` > > > And it works (but the first method is better because it respects the > > > order of arguments in the gcc manual). > > > > > > On a second computer, if I compile like this, there is an error : > > > $ gcc `xml2-config --cflags` `xml2-config --libs` main.c > > > /tmp/cc7uNwed.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' > > > collect2: ld returned 1 exit status > > > But if I compile like this, there is no error : > > > $ gcc main.c `xml2-config --cflags` `xml2-config --libs` > > > > > > I thought this was a gcc problem but someone on the gcc mailing-list tell > > > me that probably I have compiled libxml2 on the second computer > > > "statically". And I should compile it "dynamically". It's true that on > > > the second computer, I have compiled myself the library (configure, make, > > > make install). On the first computer, this is my distro package. > > > > > > How should I compile libxml2 on the 2nd computer to have the same > > > behavior on the two computers? > > > > You shouldn't; just use the last compilation command (with > > `xml2-config --libs` at the end). > > Most Unix linkers are one-pass; because of this, an object which needs > > a symbol must appear before the object (or library) which supplies > > that symbol. > > > > See for example http://webpages.charter.net/ppluzhnikov/linker.html > > > > GNU make's built-in rule for linking boils down to: > > > > %: %.c > > # commands to execute (built-in): > > $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $^ > > $(LOADLIBES) $(LDLIBS) -o $@ > > > > %: %.o > > $(CC) $(LDFLAGS) $(TARGET_ARCH) $^ $(LOADLIBES) > > $(LDLIBS) -o $@ > > > > As you can see, the list of source or object files ($^) is always > > _before_ the list of libraries (in $(LDLIBS) or $(LOADLIBES) ). > > > > Hope this helps, > > Csaba > > -- > > GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++ > > The Tao of math: The numbers you can count are not the real numbers. > > Life is complex, with real and imaginary parts. > > "Ok, it boots. Which means it must be bug-free and perfect. " -- Linus > > Torvalds > > "People disagree with me. I just ignore them." -- Linus Torvalds > > _______________________________________________ > > xml mailing list, project page http://xmlsoft.org/ > > xml@gnome.org > > http://mail.gnome.org/mailman/listinfo/xml > _______________________________________________ > xml mailing list, project page http://xmlsoft.org/ > xml@gnome.org > http://mail.gnome.org/mailman/listinfo/xml _______________________________________________ xml mailing list, project page http://xmlsoft.org/ xml@gnome.org http://mail.gnome.org/mailman/listinfo/xml
