[llvm] Fixed cmake config in case of LLVM_ENABLE_RPMALLOC=ON and non MSVC compiler (PR #139770)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-support

Author: Dmitry Vasilyev (slydiman)

<details>
<summary>Changes</summary>

This patch fixes the following error in case of LLVM_ENABLE_RPMALLOC=ON and clang or other non MSVC compiler:
```
CMake Error at cmake/modules/AddLLVM.cmake:644 (add_library):
  Target "LLVMSupport" links to item " -INCLUDE:malloc" which has leading or
  trailing whitespace.  This is now an error according to policy CMP0004.
Call Stack (most recent call first):
  cmake/modules/AddLLVM.cmake:944 (llvm_add_library)
  cmake/modules/AddLLVM.cmake:917 (add_llvm_library)
  lib/Support/CMakeLists.txt:139 (add_llvm_component_library)
```
Note `delayload_flags` is empty before this line is case of non MSVC compiler.
The behavior is the same with CMake 3.25.3 and 4.0.2.

---
Full diff: https://github.com/llvm/llvm-project/pull/139770.diff


1 Files Affected:

- (modified) llvm/lib/Support/CMakeLists.txt (+1) 


``````````diff
diff --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index df1e65f3a588c..a4c6dde6a57ff 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -113,6 +113,7 @@ if(LLVM_INTEGRATED_CRT_ALLOC)
     add_compile_definitions(ENABLE_OVERRIDE ENABLE_PRELOAD)
     set(ALLOCATOR_FILES "${LLVM_INTEGRATED_CRT_ALLOC}/rpmalloc/rpmalloc.c")
     set(delayload_flags "${delayload_flags} ${WL}-INCLUDE:malloc")
+    string(STRIP ${delayload_flags} delayload_flags)
   elseif(LLVM_INTEGRATED_CRT_ALLOC MATCHES "snmalloc$")
     set(ALLOCATOR_FILES "${LLVM_INTEGRATED_CRT_ALLOC}/src/snmalloc/override/new.cc")
     set(system_libs ${system_libs} "mincore.lib" "${WL}-INCLUDE:malloc")

``````````

</details>


https://github.com/llvm/llvm-project/pull/139770