[compiler-rt] [sanitizer] Fix libcxx cache existence check in symbolizer build (PR #149249)

[via llvm-commits]

https://github.com/int-zjt created https://github.com/llvm/llvm-project/pull/149249

The script incorrectly checked ${LLVM_BUILD}/build.ninja to determine if cached libcxx is available, while it should be checking the actual libcxx build directory at ${LIBCXX_BUILD}/build.ninja.


>From 2588f490c776f5aa4ed88923924eb57f662b3b75 Mon Sep 17 00:00:00 2001
From: int-zjt <zhangjiatong.0 at bytedance.com>
Date: Thu, 17 Jul 2025 11:09:38 +0800
Subject: [PATCH] [sanitizer] Fix libcxx cache existence check in symbolizer
 build

---
 .../lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler-rt/lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh b/compiler-rt/lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh
index 4d435976d3a10..c16ced067d4df 100755
--- a/compiler-rt/lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh
+++ b/compiler-rt/lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh
@@ -87,7 +87,7 @@ AR="${AR}" CC="${CC}" CFLAGS="$FLAGS -Wno-deprecated-non-prototype" RANLIB=/bin/
 make -j libz.a
 
 # Build and install libcxxabi and libcxx.
-if [[ ! -f ${LLVM_BUILD}/build.ninja ]]; then
+if [[ ! -f ${LIBCXX_BUILD}/build.ninja ]]; then
   rm -rf "${LIBCXX_BUILD}" "${LIBCXX_INSTALL}"
   mkdir -p ${LIBCXX_BUILD} ${LIBCXX_INSTALL}
   cd ${LIBCXX_BUILD}