[libc-commits] [libc] [libc] Replace -nostdlib++ flag when building with gcc and add placement new operator to HermeticTestUtils.cpp. (PR #78906)

[Schrodinger ZHU Yifan via libc-commits]

SchrodingerZhu wrote:

https://github.com/llvm/llvm-project/blob/37ca558a9ed60cfff960f91dbb4dc30a70107601/libc/test/UnitTest/HermeticTestUtils.cpp#L26

Is this still true with `COMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC`?

https://github.com/llvm/llvm-project/pull/78906