[llvm] [openmp] Remaining work necessary for GCC 15 (PR #157385)

[Nikita Popov via llvm-commits]

================
@@ -170,7 +170,7 @@ endif()
 # avoid an unwanted dependency on libstdc++.so.
 add_compile_definitions(_GLIBCXX_NO_ASSERTIONS)
 if(NOT WIN32)
-  add_definitions(-U_GLIBCXX_ASSERTIONS)
+  add_definitions(-U_GLIBCXX_ASSERTIONS -D_GLIBCXX_NO_ASSERTIONS)
----------------
nikic wrote:

Isn't _GLIBCXX_NO_ASSERTIONS already being set two lines above?

https://github.com/llvm/llvm-project/pull/157385