Gentoo: LUA library for INSTALL_CMOD - thpp search in /usr/lib64 instead of /usr/lib64/lua/5.1

[archenroot]

Hi,

I work on Torch ebuilds in my overlay. And got into situation which is quite easy to fix, but to me question which solution is correct.

When I install Torch package I do it as:

DESCRIPTION="Torch is a Lua-based suite for scientific computations based on multidimensional tensors." 
HOMEPAGE="https://github.com/torch/torch7" 
EGIT_REPO_URI="https://github.com/torch/torch7.git" 

.... 
src_configure() { 
   local mycmakeargs=( 
      "-DLUADIR=$($(tc-getPKG_CONFIG) --variable INSTALL_LMOD $(usex luajit 'luajit' 'lua'))" 
      "-DLIBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_LIB $(usex luajit 'luajit' 'lua'))" 
      "-DLUA_BINDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))" 
      "-DLUA_INCDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_INC $(usex luajit 'luajit' 'lua'))" 
      "-DLUA_LIBDIR=$($(tc-getPKG_CONFIG) --variable INSTALL_CMOD $(usex luajit 'luajit' 'lua'))" 
      "-DSCRIPTS_DIR=$($(tc-getPKG_CONFIG) --variable INSTALL_BIN $(usex luajit 'luajit' 'lua'))" 
      "-DLUALIB=`equery files luajit |grep lib64/libluajit | grep .so | awk 'NR==0; END{print}'`" 
      "-DLUA=/usr/bin/luajit" 
   ) 

   cmake-utils_src_configure 
}

Important is my configuration of LUA libraries. With these settings Torch is installed as following:

Code:
 * QA Notice: The following shared libraries lack a SONAME 
 * /usr/lib64/libtorch.so 

strip: x86_64-pc-linux-gnu-strip --strip-unneeded -R .comment -R .GCC.command.line -R .note.gnu.gold-version 
   usr/lib64/lua/5.1/libluaT.so.0 
   usr/lib64/libtorch.so 
   usr/lib64/lua/5.1/libTH.so.0 

So some goes directly to /usr/lib64 and some goes to lua subdir, which looks correct to me.

Next I am emerging ebuild for Facebook TH++ library based on Troch using CMAKE from repo as well, but this time the library build fails on:

CMake Error at /usr/share/cmake/torch/TorchExports.cmake:70 (message): 
  The imported target "TH" references the file 

     "/usr/lib64/libTH.so.0" 

  but this file does not exist.  Possible reasons include: 

  * The file was deleted, renamed, or moved to another location. 

  * An install or uninstall procedure did not complete successfully. 

  * The installation package was faulty and contained 

     "/usr/share/cmake/torch/TorchExports.cmake" 

  but not all the files it references. 

Call Stack (most recent call first): 
  /usr/share/cmake/torch/TorchConfig.cmake:29 (INCLUDE) 
  CMakeLists.txt:26 (FIND_PACKAGE)

Could you suggest if the problem is in Cmake files with TH++ by looking in wrong libraries, I can of course write a patch for Gentoo, but more thinking now what is the correct way.

Thank you for suggestions.

Ladislav