https://bugs.llvm.org/show_bug.cgi?id=51564
Bug ID: 51564
Summary: IRMover warning "Linking two modules of different
target triples" crashes clang
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: l...@inglorion.net
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
See https://bugs.chromium.org/p/chromium/issues/detail?id=1128437
This is a ThinLTO build, where clang is invoked with -fthinlto-index to
generate machine code.
IRMover.cpp contains code to check that when linking two IR modules together,
their target triples are compatible. In this case they are not, so a warning
diagnostic is generated.
The diagnostic is handled by BackendConsumer::DiagnosticHandlerImpl in
clang/lib/CodeGen/CodeGenAction.cpp. This contains an assert that CurLinkModule
is set. When LLVM is built with asserts enabled, this assert will crash the
compiler, even if the diagnostic never results in a message to the user.
Immediately after that assert, the diagnostic is in fact ignored, so we're
crashing the compiler for a diagnostic that we never surface.
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