[clang] [lld] [llvm] [Windows] Add support for emitting PGO/LTO magic strings in the Windows PE debug directory (PR #114260)

[Alexandre Ganea via cfe-commits]

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@@ -0,0 +1,13 @@
+// This test checks if Window PE file compiled with -flto option contains a magic 
+// string "LTCG" to indicate LTO compilation.
+
+// REQUIRES: system-windows
+
+// RUN: %clang --target=x86_64-pc-windows-msvc -flto -fuse-ld=lld %s -o %t.exe
+// RUN: dumpbin /HEADERS %t.exe | FileCheck %s
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aganea wrote:

@mikolaj-pirog One of the goals of LLVM
is cross compilation. `dumpbin` will not be available on Linux. We usually use `REQUIRES: system-windows` for testing low-level stuff on that system. For this case you’d probably want to change `llvm-objdump` to match `dumpbin` behavior.

https://github.com/llvm/llvm-project/pull/114260