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? ----- 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
