Hi all,
I am currently writing a program that will involve C and libxml. The probelm is, when i run my program, it say something like "undefined reference to '_xmlNewNode ' ", so is there any way that i can solve that.
And i am using cygwin, i have also install the package for libxml too.
Thanks
Diana
diana --> programming is tough
Basically, you need to tell the compiler what libraries you're using.
In this case, this would cause the compiler to link with a file called libxml.aCode:gcc prog.c -lxml
You need to find what your actual library is called, and adjust the command line accordingly.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
This is my make file:
" libxml " is the folder where all the library file are. Then after i type "make", bash showCode:CC = gcc CFLAGS = -Wall -g -I/cygwin/home/Diana/ass1/ass/bin/labweek11/libxml LIBS = -lxml2 outline: outline.o $(CC) $(CFLAGS) $(LIBS) -o $@ outline.o
Which is all the code that is written using xml.Code:$ make gcc -Wall -g -I/cygwin/home/Diana/ass1/ass/bin/labweek11/libxml -lxml2 -o outline outli outline.o(.text+0x1ab): In function `main': /home/Diana/ass1/ass/bin/labweek11/outline.c:89: undefined reference to `_xmlNewDoc' outline.o(.text+0x1c5):/home/Diana/ass1/ass/bin/labweek11/outline.c:90: undefined refer NewNode' outline.o(.text+0x1e3):/home/Diana/ass1/ass/bin/labweek11/outline.c:91: undefined refer DocSetRootElement' outline.o(.text+0x230):/home/Diana/ass1/ass/bin/labweek11/outline.c:97: undefined refer SaveFormatFile' outline.o(.text+0x285): In function `process': /home/Diana/ass1/ass/bin/labweek11/outline.c:118: undefined reference to `_xmlNodeSetCo outline.o(.text+0x407):/home/Diana/ass1/ass/bin/labweek11/outline.c:150: undefined refe lNewTextChild' outline.o(.text+0x51c):/home/Diana/ass1/ass/bin/labweek11/outline.c:169: undefined refe lNewTextChild' outline.o(.text+0x556):/home/Diana/ass1/ass/bin/labweek11/outline.c:173: undefined refe lNewTextChild' outline.o(.text+0x664):/home/Diana/ass1/ass/bin/labweek11/outline.c:194: undefined refe lNewTextChild' collect2: ld returned 1 exit status make: *** [outline] Error 1
Can anyone help me to slove this??
diana --> programming is tough
Here's what my xml configs says.
>xml-config --libs
-L/usr/lib -lxml -lz
or if you are using xml2
>xml2-config --libs
-L/usr/lib -lxml2 -lz -lpthread -lm
-- Add Your Signature Here --
> gcc -Wall -g -I/cygwin/home/Diana/ass1/ass/bin/labweek11/libxml -lxml2
The command line is order sensitive (read it from left to right).
You need to list your .o files BEFORE your library files.
Otherwise, you have no idea which symbols you need to resolve from the library (because there are none when it goes past the library).
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
I change my Makefile a little, to like this
So when i compile "make", it have all this errors. It seem to me that "make" didn't detect the "LIBS", i think it wired. Have been trying to fixed this for hours already.... Can anyone see what was wrong??Code:CC = gcc # CFLAGS = -Wall -g -L/cygwin/usr/include/libxml2/libxml CFLAGS = -Wall -g -L/cygwin/home/Diana/ass1/ass/bin/labweek11/libxml LIBS = -lxml2 outline: outline.o $(CC) $(LDFLAGS) -o $@ outline.o $(LIBS)
Thanks...Code:$ make gcc -Wall -g -I/cygwin/usr/include/libxml2/libxml -c -o outline.o outline.c outline.c:12:30: libxml/xmlmemory.h: No such file or directory outline.c:13:27: libxml/parser.h: No such file or directory outline.c:50: error: parse error before "xmlNodePtr" outline.c:50: warning: no semicolon at end of struct or union outline.c:52: error: parse error before '}' token outline.c:52: warning: type defaults to `int' in declaration of `Component' outline.c:52: warning: data definition has no type or storage class outline.c:54: error: parse error before "nest" outline.c:54: warning: type defaults to `int' in declaration of `nest' outline.c:54: warning: data definition has no type or storage class outline.c:58: error: parse error before "xmlDocPtr" outline.c: In function `main': outline.c:64: error: `xmlDocPtr' undeclared (first use in this function) outline.c:64: error: (Each undeclared identifier is reported only once outline.c:64: error: for each function it appears in.) outline.c:64: error: parse error before "doc" outline.c:65: error: `xmlNodePtr' undeclared (first use in this function) outline.c:89: error: `doc' undeclared (first use in this function) outline.c:89: warning: implicit declaration of function `xmlNewDoc' outline.c:90: error: `np' undeclared (first use in this function) outline.c:90: warning: implicit declaration of function `xmlNewNode' outline.c:91: warning: implicit declaration of function `xmlDocSetRootElement' outline.c:93: error: request for member `element' in something not a structure or union outline.c:94: error: request for member `num_children' in something not a structure or union outline.c:97: warning: implicit declaration of function `xmlSaveFormatFile' outline.c: At top level: outline.c:102: error: parse error before "xmlDocPtr" outline.c: In function `process': outline.c:107: error: `xmlNodePtr' undeclared (first use in this function) outline.c:107: error: parse error before "np" outline.c:115: error: `fin' undeclared (first use in this function) outline.c:118: warning: implicit declaration of function `xmlNodeSetContent' outline.c:118: error: request for member `element' in something not a structure or unio n outline.c:150: error: `np' undeclared (first use in this function) outline.c:150: warning: implicit declaration of function `xmlNewTextChild' outline.c:150: error: request for member `element' in something not a structure or unio n outline.c:151: error: request for member `num_children' in something not a structure or union outline.c:152: error: `temp' undeclared (first use in this function) outline.c:169: error: request for member `element' in something not a structure or unio n outline.c:173: error: request for member `element' in something not a structure or unio n outline.c:175: error: request for member `num_children' in something not a structure or union outline.c:194: error: request for member `element' in something not a structure or unio n outline.c:195: error: request for member `num_children' in something not a structure or union outline.c: In function `getlabel': outline.c:217: error: request for member `num_children' in something not a structure or union outline.c:219: error: request for member `num_children' in something not a structure or union make: *** [outline.o] Error 1
diana --> programming is tough
Nice folder names lol :] ...[edit] Ohh that means assignment, I have a sick mind. :[Originally Posted by dianazheng
yap ass ==> assignment....
No offend for that, that is just my shortcut for my assignment
diana --> programming is tough
> gcc -Wall -g -I/cygwin/usr/include/libxml2/libxml -c -o outline.o outline.c
> outline.c:12:30: libxml/xmlmemory.h: No such file or directory
The effective path being
/cygwin/usr/include/libxml2/libxml/libxml/xmlmemory.h
Try say
gcc -Wall -g -I/cygwin/usr/include/libxml2 -c -o outline.o outline.c
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
I have try each and everyone of the "CFLAGS" in my "makefile" and i am sure that i have the "libxml2.a" , "libxml2.dll.a" , "libxml2.la" and "xmlmemory.h" in the all the directory.
But i think it is wired that when i compile my "makefile", it say can't find the "/libxml/xmlmemory.h" and the "/libxml/parser.h" file.Code:CC = gcc CFLAGS = -Wall -g -L/cygwin/usr/include/libxml2/libxml LIBS = -lxml2 # CFLAGS = -Wall -g -I/cygwin/lib/libxml # CFLAGS = -Wall -g -L/cygwin/home/Diana/ass1/ass/bin/labweek11/libxml # CFLAGS = -Wall -g -I/usr/include/libxml2 # CFLAGS = -Wall -g -I/usr/include/libxml # CFLAGS = -Wall -g -I/cygwin/usr/include/libxml2/libxml -l/cygwin/usr/include/libxml2/libxml # CFLAGS = -Wall -g -L/cygwin/usr/include/libxml2/libxml # LIBS = -lxml outline: outline.o $(CC) $(LDFLAGS) -o $@ outline.o $(LIBS)
Code:$ make gcc -Wall -g -L/cygwin/usr/include/libxml2/libxml -c -o outline.o outline.c outline.c:12:30: libxml/xmlmemory.h: No such file or directory outline.c:13:27: libxml/parser.h: No such file or directory outline.c:50: error: parse error before "xmlNodePtr" outline.c:50: warning: no semicolon at end of struct or union outline.c:52: error: parse error before '}' token outline.c:52: warning: type defaults to `int' in declaration of `Component' outline.c:52: warning: data definition has no type or storage class outline.c:54: error: parse error before "nest" outline.c:54: warning: type defaults to `int' in declaration of `nest' outline.c:54: warning: data definition has no type or storage class outline.c:58: error: parse error before "xmlDocPtr" outline.c: In function `main': outline.c:64: error: `xmlDocPtr' undeclared (first use in this function) outline.c:64: error: (Each undeclared identifier is reported only once outline.c:64: error: for each function it appears in.) outline.c:64: error: parse error before "doc" outline.c:65: error: `xmlNodePtr' undeclared (first use in this function) outline.c:89: error: `doc' undeclared (first use in this function) outline.c:89: warning: implicit declaration of function `xmlNewDoc' outline.c:90: error: `np' undeclared (first use in this function) outline.c:90: warning: implicit declaration of function `xmlNewNode' outline.c:91: warning: implicit declaration of function `xmlDocSetRootElement' outline.c:93: error: request for member `element' in something not a structure or union outline.c:94: error: request for member `num_children' in something not a structure or union outline.c:97: warning: implicit declaration of function `xmlSaveFormatFile' outline.c: At top level: outline.c:102: error: parse error before "xmlDocPtr" outline.c: In function `process': outline.c:107: error: `xmlNodePtr' undeclared (first use in this function) outline.c:107: error: parse error before "np" outline.c:115: error: `fin' undeclared (first use in this function) outline.c:118: warning: implicit declaration of function `xmlNodeSetContent' outline.c:118: error: request for member `element' in something not a structure or unio n outline.c:150: error: `np' undeclared (first use in this function) outline.c:150: warning: implicit declaration of function `xmlNewTextChild' outline.c:150: error: request for member `element' in something not a structure or unio n outline.c:151: error: request for member `num_children' in something not a structure or union outline.c:152: error: `temp' undeclared (first use in this function) outline.c:169: error: request for member `element' in something not a structure or unio n outline.c:173: error: request for member `element' in something not a structure or unio n outline.c:175: error: request for member `num_children' in something not a structure or union outline.c:194: error: request for member `element' in something not a structure or unio n outline.c:195: error: request for member `num_children' in something not a structure or union outline.c: In function `getlabel': outline.c:217: error: request for member `num_children' in something not a structure or union outline.c:219: error: request for member `num_children' in something not a structure or union make: *** [outline.o] Error 1
Last edited by dianazheng; 05-26-2005 at 08:58 AM.
diana --> programming is tough
1. If you're building within cygwin, then remove all the /cygwin from the start of paths.
Within cygwin, everything starts with /usr
2. libxml/xmlmemory.h
This is
#include <libxml/xmlmemory.h>
right?
In which case, you need to find the directory which contains a directory called libxml, which itself contains a file called xmlmemory.h
On my system, such a directory is /usr/include/libxml2
So I would say
CFLAGS = -Wall -g -L/usr/include/libxml2
Of course, you need to make sure you've actually installed it!
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Thanks i finally got my makefile working in cygwin....
It should be
Code:CFLAGS = -Wall -g -I/usr/include/libxml2
diana --> programming is tough
