[libc] [libcxx] [libcxxabi] [libunwind] [cmake] Normalize TARGET_SUBDIR paths (PR #138524)

[Raul Tambre via cfe-commits]

https://github.com/tambry created https://github.com/llvm/llvm-project/pull/138524

Some code paths normalize ".." and thus don't create the directory.  
But some execute in a shell thus requiring the directory to exist to be able to take the parent directory.  
Normalize all the `TARGET_SUBDIR` variables to avoid this issue.

>From 1a2e201b3f4ae437852a83d926799617004b2728 Mon Sep 17 00:00:00 2001
From: Raul Tambre <raul at tambre.ee>
Date: Mon, 5 May 2025 15:40:25 +0300
Subject: [PATCH] [cmake] Normalize TARGET_SUBDIR paths

Some code paths normalize ".." and thus don't create the directory.
But some execute in a shell thus requiring the directory to exist to be able to take the parent directory.
Normalize all the `TARGET_SUBDIR` variables to avoid this issue.
---
 libc/CMakeLists.txt      | 1 +
 libcxx/CMakeLists.txt    | 1 +
 libcxxabi/CMakeLists.txt | 1 +
 libunwind/CMakeLists.txt | 1 +
 4 files changed, 4 insertions(+)

diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index b264dcb4974c7..f21fc2fba7305 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -220,6 +220,7 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
   if(LIBC_LIBDIR_SUBDIR)
     string(APPEND LIBC_TARGET_SUBDIR /${LIBC_LIBDIR_SUBDIR})
   endif()
+  cmake_path(NORMAL_PATH LIBC_TARGET_SUBDIR)
 endif()
 
 if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND (LIBC_ENABLE_USE_BY_CLANG OR LIBC_TARGET_OS_IS_GPU))
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index ebaa6e9fd0e97..da059ffef8034 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -419,6 +419,7 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
   if(LIBCXX_LIBDIR_SUBDIR)
     string(APPEND LIBCXX_TARGET_SUBDIR /${LIBCXX_LIBDIR_SUBDIR})
   endif()
+  cmake_path(NORMAL_PATH LIBCXX_TARGET_SUBDIR)
   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LIBCXX_TARGET_SUBDIR})
   set(LIBCXX_GENERATED_INCLUDE_DIR "${LLVM_BINARY_DIR}/include/c++/v1")
   set(LIBCXX_GENERATED_MODULE_DIR "${LLVM_BINARY_DIR}/modules/c++/v1")
diff --git a/libcxxabi/CMakeLists.txt b/libcxxabi/CMakeLists.txt
index 6dcfc51e55321..3e2f80b818450 100644
--- a/libcxxabi/CMakeLists.txt
+++ b/libcxxabi/CMakeLists.txt
@@ -187,6 +187,7 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
   if(LIBCXXABI_LIBDIR_SUBDIR)
     string(APPEND LIBCXXABI_TARGET_SUBDIR /${LIBCXXABI_LIBDIR_SUBDIR})
   endif()
+  cmake_path(NORMAL_PATH LIBCXXABI_TARGET_SUBDIR)
   set(LIBCXXABI_HEADER_DIR ${LLVM_BINARY_DIR})
   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LIBCXXABI_TARGET_SUBDIR})
   set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LIBCXXABI_TARGET_SUBDIR} CACHE STRING
diff --git a/libunwind/CMakeLists.txt b/libunwind/CMakeLists.txt
index 3c8499fd33464..e27f3c2e2fc17 100644
--- a/libunwind/CMakeLists.txt
+++ b/libunwind/CMakeLists.txt
@@ -145,6 +145,7 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
   if(LIBUNWIND_LIBDIR_SUBDIR)
     string(APPEND LIBUNWIND_TARGET_SUBDIR /${LIBUNWIND_LIBDIR_SUBDIR})
   endif()
+  cmake_path(NORMAL_PATH LIBUNWIND_TARGET_SUBDIR)
   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LIBUNWIND_TARGET_SUBDIR})
   set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LIBUNWIND_TARGET_SUBDIR} CACHE STRING
       "Path where built libunwind libraries should be installed.")