Re: Cannot see CFLAGS

[Benoit SIGOURE]

On Oct 22, 2007, at 5:07 PM, Hongliang Wang wrote:

> Hello, all.
>
> I built two libraries in two directories (gen and ora) respectively  
> and now are building the executable program in "util" directory  
> linked against the previous libraries. However, errors arise when  
> compling.
>
> address@hidden> make
> make  all-recursive
> make[1]: Entering directory `/export/guam/jigsaw/dev/jhwgu/src/jz'
> Making all in gen
> make[2]: Entering directory `/export/guam/jigsaw/dev/jhwgu/src/jz/gen'
> make[2]: Nothing to be done for `all'.
> make[2]: Leaving directory `/export/guam/jigsaw/dev/jhwgu/src/jz/gen'
> Making all in ora
> make[2]: Entering directory `/export/guam/jigsaw/dev/jhwgu/src/jz/ora'
> make[2]: Nothing to be done for `all'.
> make[2]: Leaving directory `/export/guam/jigsaw/dev/jhwgu/src/jz/ora'
> Making all in util
> make[2]: Entering directory `/export/guam/jigsaw/dev/jhwgu/src/jz/ 
> util'
> gcc  -g -O2   -o zizzy -ggdb `pkg-config --libs glib-2.0` zizzy- 
> main.o zizzy-dictionary.o zizzy-dump.o zizzy-zop.o ../gen/ 
> libzizzy.a ../ora/libzizora.a -lm
> ../ora/libzizora.a(zizoraread.o)(.text+0x50): In function  
> `ZOraLogFileClose':
> /home/jigsaw/dev/jhwgu/src/jz/ora/zizoraread.c:197: undefined  
> reference to `ZFClose'

[more undefined references]
Your undefined references come from the libzizora.a, are you sure  
you're linking the libraries in the right order?  The most dependent  
libraries have to go first.  So if, say, libzizora.a use things from  
libzizzy.a, it must appear beforehand on the link command.  If the  
problem is not related to linking order, then can you tell us where  
are defined the various missing symbols?

> collect2: ld returned 1 exit status
> make[2]: *** [zizzy] Error 1
> make[2]: Leaving directory `/export/guam/jigsaw/dev/jhwgu/src/jz/util'
> make[1]: *** [all-recursive] Error 1
> make[1]: Leaving directory `/export/guam/jigsaw/dev/jhwgu/src/jz'
> make: *** [all] Error 2
>
> This is my Makefile.am in util
> ---------------------------------------------------------------------- 
> ----------
> # util/Makefile.am
>
> bin_PROGRAMS = zizzy
>
> zizzy_SOURCES = main.c dictionary.c dictionary.h dump.c dump.h  
> zop.c zop.h hl.env
>
> zizzy_LDADD = ../gen/libzizzy.a ../ora/libzizora.a
> zizzy_CFLAGS = -Wall -Werror `pkg-config --cflags glib-2.0`
> zizzy_LDFLAGS = -ggdb `pkg-config --libs glib-2.0`
>
> INCLUDES = -I..
[SNIP]
> So I have  two questions:
>
> 1, why cannot I see zizzy_CFLAGS in the output message? I can only  
> find zizzy_LDFLAGS.

Because `CFLAGS' means ``Compilation FLAGS'' and as such they do not  
need to be used when linking.  So they're not used when linking.   
Similarily, `LDFLAGS' aren't used during the compilation, they're  
only passed to the ``Link eDitor'' (I guess that's where `LD' comes  
from).

> 2, why does the compiler trying to re-compile the library file (gen/ 
> libzizzy.a ora/libzizora.a), but not to use them directly?

I don't see where it's trying to re-compile the library.

--
Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory

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