[build][trunk] Add triple lib to config, lib symlink workaround

[dpalermo]

- Upstream has introduced a triple lib subdir for target libraries
  (requires another search path in the cfg)
- Building with -DBUILD_SHARED_LIBS=ON causes compiler so's to appear
  as dependencies in libomptarget.so which are no longer found
- add triple lib to cfg
- symlink triple lib subdir objects back to lib to allow for libs to be found
  (workaround until -frtlib-add-rpath solution can be made)

[dpalermo]

Turning BUILD_SHARED_LIBS=OFF will unfortunately increase the size of the installation significantly:

-DBUILD_SHARED_LIBS=OFF [r5 /work1/omp-nightly/build/rocm/trunk_19.0-0]$ du -sh . 6.4G .

-DBUILD_SHARED_LIBS=ON [r5 ~]$ du -sh /COD/LATEST/trunk/ 854M /COD/LATEST/trunk/

[dpalermo]

Seems to be a recent change in the libomptarget build causing the LLVM so's to get listed as dependencies:

[r5 ~]$ ldd /COD/LATEST/trunk/lib/x86_64-unknown-linux-gnu/libomptarget.so linux-vdso.so.1 (0x00007ffdd52ca000) libomp.so => /COD/LATEST/trunk/lib/x86_64-unknown-linux-gnu/libomp.so (0x00007f60d1d84000) libLLVMObject.so.19.0git => not found libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f60d1d49000) librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f60d1d3f000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f60d1bf0000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f60d1bea000) libLLVMSupport.so.19.0git => not found libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f60d1a06000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f60d19eb000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f60d17f9000) /lib64/ld-linux-x86-64.so.2 (0x00007f60d1e9b000)

[dpalermo]

Turns out that the dependences are not new. JIT support in libomptarget. Recent change is causing the libraries to no longer be found. Workaround is to use -DBUILD_SHARED_LIBS=OFF.

[dpalermo]

Applied Michael's suggestion to add symlinks from x86_64-unknown-linux-gnu to lib which allows us to build shared again. All dependent LLVM libs in libomptarget.so currently need to be found in the same directory as the lib.

[dpalermo]

Michael tracked problem down to this patch: https://github.com/llvm/llvm-project/pull/83624

and heard from Joseph "The intended solution is to require users to set up LD_LIBRARY_PATH according and have ASO make -frtlib-add-rpath true by default."

[dpalermo]

With this patch to trunk/build_project.sh all smoke-fort tests are once again passing with trunk-atd and build size is back down to ~850MB (vs. 6.4GB):

[r5 /COD/2024-03-13a]$ du -sh trunk-atd_19.0-0 853M trunk-atd_19.0-0