[llvm] 7f9e6f6 - [llvm][cmake] Make `install_symlink` workflow work with absolute install dirs

[John Ericson via llvm-commits]

Author: John Ericson
Date: 2022-07-26T03:14:46Z
New Revision: 7f9e6f6fa6547b9c5648d96fd96920467c8b3e84

URL: https://github.com/llvm/llvm-project/commit/7f9e6f6fa6547b9c5648d96fd96920467c8b3e84
DIFF: https://github.com/llvm/llvm-project/commit/7f9e6f6fa6547b9c5648d96fd96920467c8b3e84.diff

LOG: [llvm][cmake] Make `install_symlink` workflow work with absolute install dirs

If `CMAKE_INSTALL_BINDIR` is a different absolute path per project, as
it is with NixOS when we install every package to its own prefix, the
old way fails when the absolute path gets prepended with `CMAKE_INSTALL_PREFIX`.

The `extend_path` function does what we want, but it is currently internal-only. So easier to just inline the one small case of it we need.

Also fix one stray `bin` -> `CMAKE_INSTALL_BINDIR`

Reviewed By: sebastian-ne

Differential Revision: https://reviews.llvm.org/D101070

Added: 
    

Modified: 
    llvm/cmake/modules/AddLLVM.cmake
    llvm/cmake/modules/LLVMInstallSymlink.cmake

Removed: 
    


################################################################################
diff  --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index 365742d3e8357..057431208322e 100644
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -1953,7 +1953,7 @@ endfunction()
 function(add_lit_testsuites project directory)
   if (NOT LLVM_ENABLE_IDE)
     cmake_parse_arguments(ARG "EXCLUDE_FROM_CHECK_ALL" "FOLDER" "PARAMS;DEPENDS;ARGS" ${ARGN})
-    
+
     if (NOT ARG_FOLDER)
       set(ARG_FOLDER "Test Subdirectories")
     endif()
@@ -2009,11 +2009,11 @@ function(llvm_install_library_symlink name dest type)
 
   set(output_dir lib${LLVM_LIBDIR_SUFFIX})
   if(WIN32 AND "${type}" STREQUAL "SHARED")
-    set(output_dir bin)
+    set(output_dir "${CMAKE_INSTALL_BINDIR}")
   endif()
 
   install(SCRIPT ${INSTALL_SYMLINK}
-          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+          CODE "install_symlink(\"${full_name}\" \"${full_dest}\" \"${output_dir}\")"
           COMPONENT ${component})
 
 endfunction()
@@ -2048,8 +2048,10 @@ function(llvm_install_symlink project name dest)
     set(full_dest llvm${CMAKE_EXECUTABLE_SUFFIX})
   endif()
 
+  set(output_dir "${${project}_TOOLS_INSTALL_DIR}")
+
   install(SCRIPT ${INSTALL_SYMLINK}
-          CODE "install_symlink(${full_name} ${full_dest} ${${project}_TOOLS_INSTALL_DIR})"
+          CODE "install_symlink(\"${full_name}\" \"${full_dest}\" \"${output_dir}\")"
           COMPONENT ${component})
 
   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)

diff  --git a/llvm/cmake/modules/LLVMInstallSymlink.cmake b/llvm/cmake/modules/LLVMInstallSymlink.cmake
index b5c35f706cb7e..e9be04aceb3d3 100644
--- a/llvm/cmake/modules/LLVMInstallSymlink.cmake
+++ b/llvm/cmake/modules/LLVMInstallSymlink.cmake
@@ -6,17 +6,20 @@ include(GNUInstallDirs)
 
 function(install_symlink name target outdir)
   set(DESTDIR $ENV{DESTDIR})
-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}")
+  if(NOT IS_ABSOLUTE "${outdir}")
+    set(outdir "${CMAKE_INSTALL_PREFIX}/${outdir}")
+  endif()
+  set(outdir "${DESTDIR}${outdir}")
 
   message(STATUS "Creating ${name}")
 
   execute_process(
     COMMAND "${CMAKE_COMMAND}" -E create_symlink "${target}" "${name}"
-    WORKING_DIRECTORY "${bindir}" ERROR_VARIABLE has_err)
+    WORKING_DIRECTORY "${outdir}" ERROR_VARIABLE has_err)
   if(CMAKE_HOST_WIN32 AND has_err)
     execute_process(
       COMMAND "${CMAKE_COMMAND}" -E copy "${target}" "${name}"
-      WORKING_DIRECTORY "${bindir}")
+      WORKING_DIRECTORY "${outdir}")
   endif()
 
 endfunction()