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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
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.
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??
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
> 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).
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
Nice folder names lol :] ...[edit] Ohh that means assignment, I have a sick mind. :[Quote:
Originally Posted by dianazheng
yap ass ==> assignment....
No offend for that, that is just my shortcut for my assignment
> 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
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
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!
Thanks i finally got my makefile working in cygwin....
It should be
Code:CFLAGS = -Wall -g -I/usr/include/libxml2