[llvm] [llvm-ar][Object][COFF] Add support for EC symbols to llvm-ar. (PR #85230)

[James Henderson via llvm-commits]

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+## Test that ECSYMBOLS section is created when ARM64EC is used.
+
+# RUN: yaml2obj %s -o %t.arm64ec.obj -DMACHINE=IMAGE_FILE_MACHINE_ARM64EC
+# RUN: yaml2obj %s -o %t.arm64.obj -DMACHINE=IMAGE_FILE_MACHINE_ARM64
+# RUN: yaml2obj %s -o %t.amd64.obj -DMACHINE=IMAGE_FILE_MACHINE_AMD64
+
+## Create ARM64EC archive
+# RUN: rm -f %t.a
+# RUN: llvm-ar crs %t.a %t.arm64ec.obj
+# RUN: llvm-nm --print-armap %t.a | FileCheck --check-prefixes=NOMAP,ECMAP %s
+
+## Add ARM64 object to the archive
+# RUN: llvm-ar rs %t.a %t.arm64.obj
+# RUN: llvm-nm --print-armap %t.a | FileCheck --check-prefixes=MAP,ECMAP %s
+
+## Create ARM64 archive
+# RUN: rm -f %t.a
+# RUN: llvm-ar crs %t.a %t.arm64.obj
+# RUN: llvm-nm --print-armap %t.a | FileCheck --check-prefixes=MAP,NOECMAP %s
+
+# Add ARM64EC object to the archive
+# RUN: llvm-ar rs %t.a %t.arm64ec.obj
+# RUN: llvm-nm --print-armap %t.a | FileCheck --check-prefixes=MAP,ECMAP %s
+
+## Create mixed archive
+# RUN: rm -f %t.a
+# RUN: llvm-ar crs %t.a %t.arm64ec.obj %t.arm64.obj
+# RUN: llvm-nm --print-armap %t.a | FileCheck --check-prefixes=MAP,ECMAP %s
+
+## Create mixed archive
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jh7370 wrote:

Perhaps worth elaborating in this comment how this differs to the other mixed archive case.

https://github.com/llvm/llvm-project/pull/85230