Cannot use static linking with librt.a?

[Hei Chan]

Hi,

I have searched online for awhile and I still can't find a good explanation why I can't use static linking with librt.a.

/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../lib64/librt.a(clock_gettime.o): In function `clock_gettime':
(.text+0x197): undefined reference to `_dl_cpuclock_offset'
collect2: ld returned 1 exit status


It seems like librt.a is a static library but it doesn't use static linking for its actual implementation _dl_cpuclock_offset?

Some people suggested (without an explanation) to explicitly specify -lpthread, but it doesn't work for me either.

$ gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured
 with: ../configure --prefix=/usr --mandir=/usr/share/man 
--infodir=/usr/share/info --enable-shared --enable-threads=posix 
--enable-checking=release --with-system-zlib --enable-__cxa_atexit 
--disable-libunwind-exceptions --enable-libgcj-multifile 
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada 
--enable-java-awt=gtk --disable-dssi --disable-plugin 
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre 
--with-cpu=generic --host=x86_64-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-52)



Thanks in advance.


Cheers,
Hei