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[libclc] Make library output directories explicit #146833
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    These changes were split off from llvm#146503. This commit makes the output directories of libclc artefacts explicit. It creates a variable for the final output directory - LIBCLC_OUTPUT_LIBRARY_DIR - which has not changed. This allows future changes to alter the output directory more simply, such as by pointing it to somewhere inside clang's resource directory. This commit also changes the output directory of each target's intermediate builtins.*.bc files. They are now placed into each respective libclc target's object directory, rather than the top-level libclc binary directory. This should help keep the binary directory a bit tidier.
              
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LGTM
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           This change broke installing symlinks. Now all symlinks are installed pointing to the build directory, i.e.: and so on.  | 
    
    
  mgorny 
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Fix the symlink creation logic to use relative paths instead of absolute, in order to ensure that the installed symlinks actually refer to the installed .bc files rather than the ones from the build directory. This was broken in llvm#146833. The change is a bit roundabout but it attempts to preserve the spirit of llvm#146833, that is the ability to use multiple output directories (provided they all resides in `${LIBCLC_OUTPUT_LIBRARY_DIR}` and preserve the same structure in the installed tree). Signed-off-by: Michał Górny <[email protected]>
    
  mgorny 
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Fix the symlink creation logic to use relative paths instead of absolute, in order to ensure that the installed symlinks actually refer to the installed .bc files rather than the ones from the build directory. This was broken in #146833. The change is a bit roundabout but it attempts to preserve the spirit of #146833, that is the ability to use multiple output directories (provided they all resides in `${LIBCLC_OUTPUT_LIBRARY_DIR}` and preserve the same structure in the installed tree). Signed-off-by: Michał Górny <[email protected]>
    
  tru 
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      Jul 22, 2025 
    
    
      
  
    
      
    
  
This reverts commit 81e6552. This change caused libclc to start installing broken symlinks that contain absolute paths to the build directory rather than relative paths within the install directory.
    
  mahesh-attarde 
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      Jul 28, 2025 
    
    
      
  
    
      
    
  
Fix the symlink creation logic to use relative paths instead of absolute, in order to ensure that the installed symlinks actually refer to the installed .bc files rather than the ones from the build directory. This was broken in llvm#146833. The change is a bit roundabout but it attempts to preserve the spirit of llvm#146833, that is the ability to use multiple output directories (provided they all resides in `${LIBCLC_OUTPUT_LIBRARY_DIR}` and preserve the same structure in the installed tree). Signed-off-by: Michał Górny <[email protected]>
  
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These changes were split off from #146503.
This commit makes the output directories of libclc artefacts explicit. It creates a variable for the final output directory - LIBCLC_OUTPUT_LIBRARY_DIR - which has not changed. This allows future changes to alter the output directory more simply, such as by pointing it to somewhere inside clang's resource directory.
This commit also changes the output directory of each target's intermediate builtins.*.bc files. They are now placed into each respective libclc target's object directory, rather than the top-level libclc binary directory. This should help keep the binary directory a bit tidier.