[LLVMbugs] [Bug 8881] New: We need warnings or errors for unsupported uses of 'asm'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8881

           Summary: We need warnings or errors for unsupported uses of
                    'asm'
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Currently clang uses the asm in a local variable declaration only when that
variable is used in a asm statement. We should produce warnings when we can.
Some options:

1) Produce warnings when a variable is not use in an asm statement. This would
warn in

void foo(void) {
        register unsigned long long bar asm("rax"); //Warning
}

2) Warn when a variable is used in a non asm statement. This would warn in

int foo(void) {
        register unsigned long long bar asm("rax");
        return bar + 1; // Warning
}

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