http://llvm.org/bugs/show_bug.cgi?id=15026
Bug #: 15026
Summary: opt should raise an error for unsupported target
triples.
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
opt currently attempts to load target information for the target triple
specified in the bitcode. If the triple does not match a known target, it
silently uses unknown target information. This can cause subtle changes in
compiler behavior that are difficult to track down.
A better approach would be for opt to enforce that a backend exists for the
specified triple.
Like llc, -mtriple could be used to override the target triple, providing a way
to bypass the error.
For example, prior to r172534, the behavior of this test changed dependning on
whether the host compiler had built the X86 backend. The test failed with a
native ARM-only compiler:
test/Transforms/LoopStrengthReduce/post-inc-icmpzero.ll
Fixing this behavior requires cleaning up the test cases, see PR15025.
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