tree b8acd7bf7812595b7a18db5879b348077eab0d19
parent 52e0337ea34142f55c427493e9ca2be5fce2dd38
author Volodymyr Sapsai <vsapsai@apple.com> 1744823645 -0700
committer GitHub <noreply@github.com> 1744823645 -0700
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[Modules] Fix an identifier hiding a function-like macro definition. (#135471)

We emit a macro definition only in a module defining it. But it means
that if another module has an identifier with the same name as the
macro, the users of such module won't be able to use the macro anymore.

Fix by storing that an identifier has a macro definition that's not in a
current module (`MacroDirectivesOffset == 0`). This way
`IdentifierLookupVisitor` knows not to stop at the first module with an
identifier but to keep checking included modules for the actual macro
definition.

Fixes issue #32040.

rdar://30258278