[clang] [llvm] [CMake][Release] Enable CMAKE_POSITION_INDEPENDENT_CODE (PR #90139)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Tom Stellard (tstellar)

<details>
<summary>Changes</summary>

Set this in the cache file directly instead of via the test-release.sh script so that the release builds can be reproduced with just the cache file.

---
Full diff: https://github.com/llvm/llvm-project/pull/90139.diff


2 Files Affected:

- (modified) clang/cmake/caches/Release.cmake (+1) 
- (modified) llvm/utils/release/test-release.sh (+1-2) 


``````````diff
diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
index c164d5497275f3..c0bfcbdfc1c2ae 100644
--- a/clang/cmake/caches/Release.cmake
+++ b/clang/cmake/caches/Release.cmake
@@ -82,6 +82,7 @@ set(LLVM_ENABLE_PROJECTS ${STAGE1_PROJECTS} CACHE STRING "")
 # stage2-instrumented and Final Stage Config:
 # Options that need to be set in both the instrumented stage (if we are doing
 # a pgo build) and the final stage.
+set_instrument_and_final_stage_var(CMAKE_POSITION_INDEPENDENT_CODE "ON" STRING)
 set_instrument_and_final_stage_var(LLVM_ENABLE_LTO "${LLVM_RELEASE_ENABLE_LTO}" STRING)
 if (LLVM_RELEASE_ENABLE_LTO)
   set_instrument_and_final_stage_var(LLVM_ENABLE_LLD "ON" BOOL)
diff --git a/llvm/utils/release/test-release.sh b/llvm/utils/release/test-release.sh
index 4314b565e11b03..050004aa08c493 100755
--- a/llvm/utils/release/test-release.sh
+++ b/llvm/utils/release/test-release.sh
@@ -353,8 +353,7 @@ function build_with_cmake_cache() {
   env CC="$c_compiler" CXX="$cxx_compiler" \
   cmake -G "$generator" -B $CMakeBuildDir -S $SrcDir/llvm \
         -C $SrcDir/clang/cmake/caches/Release.cmake \
-	-DCLANG_BOOTSTRAP_PASSTHROUGH="CMAKE_POSITION_INDEPENDENT_CODE;LLVM_LIT_ARGS" \
-        -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+	-DCLANG_BOOTSTRAP_PASSTHROUGH="LLVM_LIT_ARGS" \
         -DLLVM_LIT_ARGS="-j $NumJobs $LitVerbose" \
         $ExtraConfigureFlags
         2>&1 | tee $LogDir/llvm.configure-$Flavor.log

``````````

</details>


https://github.com/llvm/llvm-project/pull/90139