Using sunperf in shared libraries

Question

Hi,
I would like to support sunperf in one software project which uses cblas. The code using cblas is a dynamically loadable library (python module). My problem is that using -xlic_lib=sunperf does not work when building shared libraries. More concretely:
file: floupi.c
enum CBLAS_ORDER { CblasRowMajor = 101, CblasColMajor = 102 };
enum CBLAS_TRANSPOSE { CblasNoTrans = 111, CblasTrans =
     112, CblasConjTrans = 113 };
void cblas_sgemm(const enum CBLAS_ORDER Order,
          const enum CBLAS_TRANSPOSE TransA,
          const enum CBLAS_TRANSPOSE TransB, const int M,
          const int N, const int K, const float alpha,
          const float A, const int lda, const float B,
          const int ldb, const float beta, float *C, const int ldc);
int main(void)
int lda = 3;
float A[] = { 1, 2, 3,
     4, 5, 6
int ldb = 2;
float B[] = { 1, 2,
     3, 4,
     5, 6
int ldc = 2;
float C[] = { 0.00, 0.00,
     0.00, 0.00
/* Compute C = A B */
cblas_sgemm(CblasRowMajor,
          CblasNoTrans, CblasNoTrans, 2, 2, 3,
          1.0, A, lda, B, ldb, 0.0, C, ldc);
return 0;
This can be compiled easily using cc floupi.c -xlic_lib=sunperf; the executable works as expected. Now, let's say that instead of main, I use another symbol, to compile the code as a shared library:
cc -G floupi.c -xlic_lib=sunperf
Then the built shared library has the cblas_sgemm undefined (according to nm), and ldd shows that libsunperf is not linked. This of course means that for my python module, I have an error with undefined symbols when I try to import it. Why is sunperf not linked at all for shared libraries ? The problem appears both on solaris studio express on x86 and on linux x86 (sunstudio 12 in both cases).
I also noticed that if instead, I use
cc -G floupi.c -lsunperf
Then it seems that cblas_sgemm is not undefined anymore (according to nm), but this looks like linking the cblas_sgemm statically, which is not what I want.
Thanks,
David

Answer 1

I finally found the verbose option for suncc (-#), and this confirms what the above suggested, that is when -G is used, sunperf is not linked:
### Note: LD_LIBRARY_PATH = /home/david/local/intel/cc/9.1.042/lib:/home/david/opt/intel/fc/10.0.023//lib:/home/david/opt/intel/cc/10.0.023//lib:/home/david/local/lib:
### Note: LD_RUN_PATH = <null>
/usr/bin/ld -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 --enable-new-dtags /home/david/opt/sun/sunstudio12/prod/lib/crti.o /home/david/opt/sun/sunstudio12/prod/lib/values-xa.o -shared floupi.o -Y "/home/david/opt/sun/sunstudio12/prod/lib:/lib:/usr/lib" -Qy -lc /home/david/opt/sun/sunstudio12/prod/lib/libc_supp.a /home/david/opt/sun/sunstudio12/prod/lib/crtn.o