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Zhiguo Li

2008-Nov-24 11:04 UTC

[Xapian-discuss] undefined reference to "function name"

Hi,

I am trying to add some functions to the Xapian library but when I tried 
to compile it, the linker give me the "undefined reference" error.

Here is what  I did:

Under directory matcher, I created two files "something.cc" and 
"something.h".

File "something.h":

#include "xapian/enquire.h"
#include "xapian/query.h"
#include "database.h"
void something();

File "something.cc":
#include "something.h"
void something() {};

And in examples/simplesearch.cc, I included "something.h" and called 
something() in the main function.

In the Makefile.mk under matcher directory, I added matcher/something.h 
in section "noinst_HEARDERS" and matcher/something.cc in section 
"libxapian_la_SOURCES".

Then I tried to compile the project, and from the compiler output it 
looks "something.cc" was compiled fine:

    /bin/bash ./libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H 
-I. -I./common -I./include     -Wall -W -Wredundant-decls 
-Wpointer-arith -Wcast-qual -Wcast-align -Wno-long-long 
-Wformat-security -Wconversion -fno-gnu-keywords -Wundef -Wshadow 
-Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
matcher/something.lo -MD -MP -MF $depbase.Tpo -c -o matcher/something.lo 
matcher/something.cc &&\
    mv -f $depbase.Tpo $depbase.Plo
 g++ -DHAVE_CONFIG_H -I. -I./common -I./include -Wall -W 
-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
matcher/something.lo -MD -MP -MF matcher/.deps/something.Tpo -c 
matcher/something.cc  -fPIC -DPIC -o matcher/.libs/something.o
 g++ -DHAVE_CONFIG_H -I. -I./common -I./include -Wall -W 
-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
matcher/something.lo -MD -MP -MF matcher/.deps/something.Tpo -c 
matcher/something.cc -o matcher/something.o >/dev/null 2>&1


But when "examples/simplesearch.cc" was compiled, it gave the
following
error:

depbase=`echo examples/simplesearch.o | sed
's|[^/]*$|.deps/&|;s|\.o$||'`;\
    g++ -DHAVE_CONFIG_H -I. -I./common -I./include     -Wall -W 
-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
examples/simplesearch.o -MD -MP -MF $depbase.Tpo -c -o 
examples/simplesearch.o examples/simplesearch.cc &&\
    mv -f $depbase.Tpo $depbase.Po
/bin/bash ./libtool  --tag=CXX   --mode=link g++ -Wall -W 
-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2   -o 
examples/simplesearch examples/simplesearch.o  libxapian.la
g++ -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -o 
examples/.libs/simplesearch examples/simplesearch.o  
./.libs/libxapian.so -lz
examples/simplesearch.o: In function `main':
/home/zhiguoli/xapian/examples/simplesearch.cc:83: undefined reference 
to `something()'
collect2: ld returned 1 exit status
make[2]: *** [examples/simplesearch] Error 1


My question is why the linker couldn't find the definition of function 
"something()"? How to make it work? I am not clear about the overall 
design structure of Xapian yet, but I would like to make some quick hack 
and very small changes (for example, add a few functions to libxapian).

Thanks,
Kevin

Zhiguo Li

2008-Nov-26 05:33 UTC

head link

[Xapian-discuss] undefined reference to "function name"

Hi,

Maybe my last email was too long, and I will simplify it:

The following is the error I got when I tried to compile.

/bin/bash ./libtool  --tag=CXX   --mode=link g++ -Wall -W 
-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2   -o 
examples/simplesearch examples/simplesearch.o  libxapian.la
g++ -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -o 
examples/.libs/simplesearch examples/simplesearch.o  
./.libs/libxapian.so -lz
examples/simplesearch.o: In function `main':
/home/zhiguoli/xapian/examples/simplesearch.cc:83: undefined reference 
to `something()'


Obviously g++ didn't see symbol "something", but then I tried nm
and
found it indeed in libxapian.so.

nm libxapian.so | grep "something"
001cfb70 t _Z9somethingv

So why is this? Could somebody help me please? I know this is more about 
a question on programming instead of Xapian, but if I compile it else 
where it could pass easily.

Thanks,
Kevin

Zhiguo Li wrote:> Hi,
>
> I am trying to add some functions to the Xapian library but when I tried 
> to compile it, the linker give me the "undefined reference"
error.
>
> Here is what  I did:
>
> Under directory matcher, I created two files "something.cc" and 
> "something.h".
>
> File "something.h":
>
> #include "xapian/enquire.h"
> #include "xapian/query.h"
> #include "database.h"
> void something();
>
> File "something.cc":
> #include "something.h"
> void something() {};
>
> And in examples/simplesearch.cc, I included "something.h" and
called
> something() in the main function.
>
> In the Makefile.mk under matcher directory, I added matcher/something.h 
> in section "noinst_HEARDERS" and matcher/something.cc in section 
> "libxapian_la_SOURCES".
>
> Then I tried to compile the project, and from the compiler output it 
> looks "something.cc" was compiled fine:
>
>     /bin/bash ./libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H 
> -I. -I./common -I./include     -Wall -W -Wredundant-decls 
> -Wpointer-arith -Wcast-qual -Wcast-align -Wno-long-long 
> -Wformat-security -Wconversion -fno-gnu-keywords -Wundef -Wshadow 
> -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
> matcher/something.lo -MD -MP -MF $depbase.Tpo -c -o matcher/something.lo 
> matcher/something.cc &&\
>     mv -f $depbase.Tpo $depbase.Plo
>  g++ -DHAVE_CONFIG_H -I. -I./common -I./include -Wall -W 
> -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
> -Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
> -Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
> matcher/something.lo -MD -MP -MF matcher/.deps/something.Tpo -c 
> matcher/something.cc  -fPIC -DPIC -o matcher/.libs/something.o
>  g++ -DHAVE_CONFIG_H -I. -I./common -I./include -Wall -W 
> -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
> -Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
> -Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
> matcher/something.lo -MD -MP -MF matcher/.deps/something.Tpo -c 
> matcher/something.cc -o matcher/something.o >/dev/null 2>&1
>
>
> But when "examples/simplesearch.cc" was compiled, it gave the
following
> error:
>
> depbase=`echo examples/simplesearch.o | sed
's|[^/]*$|.deps/&|;s|\.o$||'`;\
>     g++ -DHAVE_CONFIG_H -I. -I./common -I./include     -Wall -W 
> -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
> -Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
> -Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
> examples/simplesearch.o -MD -MP -MF $depbase.Tpo -c -o 
> examples/simplesearch.o examples/simplesearch.cc &&\
>     mv -f $depbase.Tpo $depbase.Po
> /bin/bash ./libtool  --tag=CXX   --mode=link g++ -Wall -W 
> -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
> -Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
> -Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2   -o 
> examples/simplesearch examples/simplesearch.o  libxapian.la
> g++ -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
> -Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
> -Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -o 
> examples/.libs/simplesearch examples/simplesearch.o  
> ./.libs/libxapian.so -lz
> examples/simplesearch.o: In function `main':
> /home/zhiguoli/xapian/examples/simplesearch.cc:83: undefined reference 
> to `something()'
> collect2: ld returned 1 exit status
> make[2]: *** [examples/simplesearch] Error 1
>
>
> My question is why the linker couldn't find the definition of function 
> "something()"? How to make it work? I am not clear about the
overall
> design structure of Xapian yet, but I would like to make some quick hack 
> and very small changes (for example, add a few functions to libxapian).
>
> Thanks,
> Kevin
>
>
> _______________________________________________
> Xapian-discuss mailing list
> Xapian-discuss at lists.xapian.org
> http://lists.xapian.org/mailman/listinfo/xapian-discuss
>
>

Hightman(马明练)

2008-Nov-29 00:48 UTC

head link

[Xapian-discuss] undefined reference to "function name"

If you call some function from C library (not C++), you should do it such as:
extern "C" {
 #include "something.h";
 ...
}

=============>Hi,
>
>I am trying to add some functions to the Xapian library but when I tried 
>to compile it, the linker give me the "undefined reference" error.
>
>Here is what  I did:
>
>Under directory matcher, I created two files "something.cc" and 
>"something.h".
>
>File "something.h":
>
>#include "xapian/enquire.h"
>#include "xapian/query.h"
>#include "database.h"
>void something();
>
>File "something.cc":
>#include "something.h"
>void something() {};
>
>And in examples/simplesearch.cc, I included "something.h" and
called
>something() in the main function.
>
>In the Makefile.mk under matcher directory, I added matcher/something.h 
>in section "noinst_HEARDERS" and matcher/something.cc in section 
>"libxapian_la_SOURCES".
>
>Then I tried to compile the project, and from the compiler output it 
>looks "something.cc" was compiled fine:
>
>    /bin/bash ./libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H 
>-I. -I./common -I./include     -Wall -W -Wredundant-decls 
>-Wpointer-arith -Wcast-qual -Wcast-align -Wno-long-long 
>-Wformat-security -Wconversion -fno-gnu-keywords -Wundef -Wshadow 
>-Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
>matcher/something.lo -MD -MP -MF $depbase.Tpo -c -o matcher/something.lo 
>matcher/something.cc &&\
>    mv -f $depbase.Tpo $depbase.Plo
> g++ -DHAVE_CONFIG_H -I. -I./common -I./include -Wall -W 
>-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
>-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
>-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
>matcher/something.lo -MD -MP -MF matcher/.deps/something.Tpo -c 
>matcher/something.cc  -fPIC -DPIC -o matcher/.libs/something.o
> g++ -DHAVE_CONFIG_H -I. -I./common -I./include -Wall -W 
>-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
>-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
>-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
>matcher/something.lo -MD -MP -MF matcher/.deps/something.Tpo -c 
>matcher/something.cc -o matcher/something.o >/dev/null 2>&1
>
>
>But when "examples/simplesearch.cc" was compiled, it gave the
following
>error:
>
>depbase=`echo examples/simplesearch.o | sed
's|[^/]*$|.deps/&|;s|\.o$||'`;\
>    g++ -DHAVE_CONFIG_H -I. -I./common -I./include     -Wall -W 
>-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
>-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
>-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -MT 
>examples/simplesearch.o -MD -MP -MF $depbase.Tpo -c -o 
>examples/simplesearch.o examples/simplesearch.cc &&\
>    mv -f $depbase.Tpo $depbase.Po
>/bin/bash ./libtool  --tag=CXX   --mode=link g++ -Wall -W 
>-Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
>-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
>-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2   -o 
>examples/simplesearch examples/simplesearch.o  libxapian.la
>g++ -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align 
>-Wno-long-long -Wformat-security -Wconversion -fno-gnu-keywords -Wundef 
>-Wshadow -Winit-self -Wstrict-overflow=5 -fvisibility=hidden -g -O2 -o 
>examples/.libs/simplesearch examples/simplesearch.o  
>./.libs/libxapian.so -lz
>examples/simplesearch.o: In function `main':
>/home/zhiguoli/xapian/examples/simplesearch.cc:83: undefined reference 
>to `something()'
>collect2: ld returned 1 exit status
>make[2]: *** [examples/simplesearch] Error 1
>
>
>My question is why the linker couldn't find the definition of function 
>"something()"? How to make it work? I am not clear about the
overall
>design structure of Xapian yet, but I would like to make some quick hack 
>and very small changes (for example, add a few functions to libxapian).
>
>Thanks,
>Kevin
>
>
>_______________________________________________
>Xapian-discuss mailing list
>Xapian-discuss at lists.xapian.org
>http://lists.xapian.org/mailman/listinfo/xapian-discuss
= = = = = = = = = = = = = = = = = = = 			

?????????
??
 
				 
????????Hightman(???)
????????hightman at zuaa.zju.edu.cn
??????????2008-11-29

Xapian discuss - Nov 2008 - undefined reference to "function name"

[Xapian-discuss] undefined reference to "function name"

[Xapian-discuss] undefined reference to "function name"

[Xapian-discuss] undefined reference to "function name"