Re: [microblaze-uclinux] Problem linking threads

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Keith,

Zambrano, Keith I(GE Infrastructure) wrote:

> 
>>Hello List,
>>I am trying to build the latest distribution with threading and having link problems (Full Source Distribution 20040408). I have selected the PTHREAD option using MENUCONFIG on both the uClinux-dist configuration and uClibc. The following is the link error that I get.
>>
>>mb-gcc  -Os -g -fomit-frame-pointer   -Dlinux -D__linux__ -Dunix -D__uClinux__ -DEMBED -I/home/kzambrano/src/uClinux-dist/lib/uClibc/include -I/home/kzambrano/src/uClinux-dist/lib/libm -I/home/kzambrano/src/uClinux-dist/lib/libcrypt_old -I/home/kzambrano/src/uClinux-dist -fno-builtin -mno-xl-soft-mul -mno-xl-soft-div -mxl-barrel-shift -I/home/kzambrano/src/uClinux-dist/linux-2.4.x/include -Wl,-elf2flt -nostartfiles /home/kzambrano/src/uClinux-dist/lib/uClibc/lib/crt0.o -nostdlib -L/home/kzambrano/src/uClinux-dist/lib/uClibc/. -L/home/kzambrano/src/uClinux-dist/lib/uClibc/lib -L/home/kzambrano/src/uClinux-dist/lib/libm -L/home/kzambrano/src/uClinux-dist/lib/libnet -L/home/kzambrano/src/uClinux-dist/lib/libdes -L/home/kzambrano/src/uClinux-dist/lib/libaes -L/home/kzambrano/src/uClinux-dist/lib/libpcap -L/home/kzambrano/src/uClinux-dist/lib/libssl -L/home/kzambrano/src/uClinux-dist/lib/libcrypt_old -L/home/kzambrano/src/uClinux-dist/lib/zlib  -o plserver plserver.o cipher.o d
es.o tables.o connectctl.o debuglog.o utility.o picctl.o -lc /opt/ublaze/microblaze-elf-tools/bin/../lib/gcc-lib/microblaze/2.95.3-4/./../../../../microblaze/lib/libc_hard_shift.a /opt/ublaze/microblaze-elf-tools/bin/../lib/gcc-lib/microblaze/2.95.3-4/./libgcc.a -Wl,--start-group -Wl,-lc -Wl,-lm -Wl,-lgcc -Wl,--end-group -lc  
>>plserver.elf2flt: In function `demoMain':
>>/home/kzambrano/src/uClinux-dist/user/nx590/plserver.c:405: undefined reference to `pthread_create'
>>/home/kzambrano/src/uClinux-dist/user/nx590/plserver.c:405: undefined reference to `pthread_create'

the pthreads library is not linked by default, try adding $(LIBPTHREAD) 
to your Makefile build rule, such as:

         $(CC) $(LDFLAGS) -o $@ $< $(LIBPTHREAD) $(LDLIBS)

There's also thread demos in the uClinux-dist, in menuconfig -> 
customise vendor -> misc apps ->pthread demos.

That should at least build and run cleanly.

Cheers,

John

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