[lld] [LLD][COFF] Use archive's ECSYMBOLS on ARM64EC target when available. (PR #106904)

[Martin Storsjö via llvm-commits]

================
@@ -0,0 +1,41 @@
+REQUIRES: aarch64, x86
+RUN: split-file %s %t.dir && cd %t.dir
+
+RUN: llvm-mc -filetype=obj -triple=arm64ec-windows symref.s -o symref-arm64ec.obj
+RUN: llvm-mc -filetype=obj -triple=arm64ec-windows nsymref.s -o nsymref-arm64ec.obj
+RUN: llvm-mc -filetype=obj -triple=aarch64-windows nsymref.s -o nsymref-aarch64.obj
+RUN: llvm-mc -filetype=obj -triple=arm64ec-windows sym.s -o sym-arm64ec.obj
+RUN: llvm-mc -filetype=obj -triple=x86_64-windows sym.s -o sym-x86_64.obj
+RUN: llvm-mc -filetype=obj -triple=aarch64-windows nsym.s -o sym-aarch64.obj
+RUN: llvm-mc -filetype=obj -triple=arm64ec-windows %S/Inputs/loadconfig-arm64ec.s -o loadconfig-arm64ec.obj
+
+RUN: llvm-lib -machine:arm64ec -out:sym-arm64ec.lib sym-arm64ec.obj sym-aarch64.obj
+RUN: llvm-lib -machine:amd64 -out:sym-x86_64.lib sym-x86_64.obj
+
+RUN: lld-link -machine:arm64ec -dll -noentry -out:test.dll symref-arm64ec.obj sym-arm64ec.lib loadconfig-arm64ec.obj
+RUN: lld-link -machine:arm64ec -dll -noentry -out:test2.dll symref-arm64ec.obj sym-x86_64.lib loadconfig-arm64ec.obj
+RUN: lld-link -machine:arm64x -dll -noentry -out:test3.dll symref-arm64ec.obj nsymref-aarch64.obj sym-arm64ec.lib loadconfig-arm64ec.obj
+
+RUN: not lld-link -machine:arm64ec -dll -noentry -out:test-err.dll nsymref-arm64ec.obj sym-arm64ec.lib loadconfig-arm64ec.obj 2>&1 |\
+RUN:              FileCheck --check-prefix=ERR %s
----------------
mstorsjo wrote:

Oh, now I see the source of my confusion. I missed this details: `nsym.s -o sym-aarch64.obj`

To me, I think it'd be clearer if you'd name that object file `nsym-aarch64.obj`, to make it clearer that it defines the symbol `nsym`, not `sym`.

https://github.com/llvm/llvm-project/pull/106904