[lld] [LLD][COFF] Add support for the -defArm64Native argument (PR #123850)

[Martin Storsjö via llvm-commits]

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@@ -162,6 +162,29 @@ EXPORTS-BOTH-NEXT:     RVA: 0x3000
 EXPORTS-BOTH-NEXT:   }
 EXPORTS-BOTH-NEXT: }
 
+# Export using both the -def and -defarm64native arguments.
+
+RUN: lld-link -machine:arm64x -dll -out:out-def-both.dll arm64ec-func.obj arm64-func.obj \
+RUN:          loadconfig-arm64.obj loadconfig-arm64ec.obj -def:func.def -defarm64native:func.def -noentry
+RUN: llvm-objdump -d out-def-both.dll | FileCheck --check-prefix=DISASM-BOTH %s
+RUN: llvm-readobj --headers --coff-exports out-def-both.dll | FileCheck --check-prefix=EXPORTS-BOTH %s
+
+# -defarm64native is ignored if -def is not specified.
+
+RUN: lld-link -machine:arm64x -dll -out:out-def-native.dll arm64ec-func.obj arm64-func.obj \
+RUN:          loadconfig-arm64.obj loadconfig-arm64ec.obj -defarm64native:func.def -noentry
+RUN: llvm-readobj --headers --coff-exports out-def-native.dll | FileCheck --check-prefix=NO-EXPORT %s
+NO-EXPORT:  ExportTableRVA: 0x0
+NO-EXPORT:  ExportTableSize: 0x0
+NO-EXPORT:  HybridObject {
+NO-EXPORT:    ExportTableRVA: 0x0
+NO-EXPORT:    ExportTableSize: 0x0
+NO-EXPORT:  }
+
+# -defarm64native is ignored on ARM64 target.
+
+RUN: lld-link -machine:arm64 -dll -out:out-arm64-def.dll arm64-func.obj -defarm64native:undef.def -def:func.def -noentry
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mstorsjo wrote:

This test doesn't really verify that it is ignored; it only says that linking does succeed - but it doesn't verify e.g. that we don't print any warning. We can test that, without needing to specify any explicit `-NOT` tests, by doing `2>&1 | count 0` on the run line.

https://github.com/llvm/llvm-project/pull/123850