Re:[Help] Error when Glib cross compiled without the support of "_POSIX_THREADS"

[Lele MA]

Hi all,


I simply comment the line "#include<glib/deprecated/gthread.h>" in glib.h and 
it goes well. It seems it can include the head file successfully.

But when I write some simple codes use the glib:

     //main.c
     #include <glib.h>

     gint       i, rc;
     GHashTable     *h;
     h = g_hash_table_new (NULL, NULL);

it yields " undefined reference to `g_hash_table_new' ". It can find the 
'GHashTable' definition but cannot find the 'g_hash_table_new', where all of 
them are included indirectly in <glib.h>.


Have you anyone come across similar error when cross compiling the glib?


Lele Ma





在 2014-09-25 14:29:11，"Lele MA" <lelema...@gmail.com> 写道：

Hi all,

I am trying to cross compile Glib into xen stubdom (based on Mini-OS), which 
has only the libc support from newlib. The cross root directory is 
'/cross-root-x86_64/x86_64-xen-elf/'

I add the 'cross-glib' target in Makefile and the cross compile and install is 
succeed. The Makefile rules like this:


    TARGET_CPPFLAGS += -isystem 
$(CROSS_PREFIX)/$(GNU_TARGET_ARCH)-xen-elf/include/glib-2.0  

    TARGET_CPPFLAGS += -isystem 
$(CROSS_PREFIX)/$(GNU_TARGET_ARCH)-xen-elf/lib/glib-2.0/include


     .PHONY: cross-glib
     cross-glib: glib-$(GLIB_VERSION) $(NEWLIB_STAMPFILE)
           ( cd $< && \
            CC_FOR_TARGET="$(CC) $(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" 
./configure --prefix=$(CROSS_PREFIX)/$(GNU_TARGET_ARCH)-xen-elf --verbose 
--host=$(GNU_TARGET_ARCH)-xen-elf && \
            $(MAKE) DESTDIR= && \
            $(MAKE) DESTDIR= install )

Then I write programs to include <glib.h>, like this:

    //file: main.c
    #include <stdio.h>
    #include <unistd.h>
    #include <glib.h>
    int main(void) {        
        sleep(2);
        printf("Hello, world!\n");
        return 0;
    }

But when cross compiled, it yields:
        
cross-root-x86_64/x86_64-xen-elf/include/glib-2.0/glib/deprecated/gthread.h:162:5:
 error: unknown type name ‘pthread_t’
        make[1]: *** [main.o] Error 1

I find pthread_t is defined in <sys/types.h>, which is included in 'pthread.h':
      #if defined(_POSIX_THREADS)
      #include <sys/types.h>
      #include <time.h>
      #include <sys/sched.h>

Does it mean the system doesn't define "_POSIX_THREADS"?
If so, can I still use the glib in the Mini-OS without the support of 
"_POSIX_THREADS"?

Any advice will be appreciated!

Lele Ma




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