[lld] [LLD][COFF] Update nodefaultlibs after updating search paths (PR #128813)

[Martin Storsjö via llvm-commits]

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@@ -36,3 +36,8 @@ MSVC stamps uppercase references in OBJ directives, thus ensure that passing low
 
 UPPERCASE-NOT: OLDNAMES
 UPPERCASE-NOT: LIBCMT
+
+# RUN: yaml2obj -o %T/defaultlib.obj %p/Inputs/defaultlib.yaml
+# RUN: mkdir -p %t.dir/sysroot/VC/Tools/MSVC/1.1.1.1/lib/x64
+# RUN: cp %p/Inputs/ret42.lib %t.dir/sysroot/VC/Tools/MSVC/1.1.1.1/lib/x64/default.lib
+# RUN: not lld-link /winsysroot:%t.dir/sysroot /out:%t.exe /entry:main /subsystem:console /nodefaultlib:default.lib %T/defaultlib.obj
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mstorsjo wrote:

Yes, I'm sure there are other tests that validate that, but the point here is to make sure that the test setup within this testcase actually works as intended. It's easy to make a typo, which makes the `not lld-link` case fail in an unexpected way.

Actually, it could be good to check that we actually get the right error here as well. To do that, change the `not lld-link` case into `env LLD_IN_TEST=1 not lld-link [...options...] 2>&1 | FileCheck %s --check-prefix=NODEFAULTLIB`, and check that we actually get the right error - `undefined symbol: main` in this case.

https://github.com/llvm/llvm-project/pull/128813