[llvm-bugs] [Bug 34491] New: Invalid warning about unsupported target("thumb") attribute

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34491

            Bug ID: 34491
           Summary: Invalid warning about unsupported target("thumb")
                    attribute
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eugeni.stepanov at gmail.com
                CC: llvm-bugs at lists.llvm.org

Any use of ARM-specific target attributes, like the following:
__attribute__((target("arm")))
unsigned long f_arm() {
  return 3;
}

generates incorrect warnings like these:

warning: ignoring unsupported 'arm' in the target attribute string
[-Wignored-attributes]
__attribute__((target("arm")))

warning: ignoring unsupported 'thumb' in the target attribute string
[-Wignored-attributes]
__attribute__((target("thumb")))

while, in fact, the attribute in NOT ignored and has the desired effect.

This comes from TargetInfo::isValidFeatureName(), which simply returns false
for ARM.

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