[LLVMbugs] [Bug 11082] New: Support may_alias in processTypeAttrs()

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11082

           Summary: Support may_alias in processTypeAttrs()
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu


clang now complains about unsupported attributes on types. As a consequence, it
complains about may_alias in cast expressions such as here:

void g(int p __attribute__((may_alias))) {}

void f() {
  int a = 0;
  g((int __attribute__((may_alias)))a);
}

hummer:clang thakis$ ../../Release+Asserts/bin/clang -Wall test.c -c
test.c:5:25: error: 'may_alias' attribute ignored when parsing type
  g((int __attribute__((may_alias)))a);
                        ^~~~~~~~~
1 error generated.


This is used in glib, see e.g. here:
http://codesearch.google.com/#cZwlSNS7aEw/external/bluetooth/glib/glib/gatomic.h&q=%5C(g_atomic_pointer_set%5C)%5C%20%5C(%5C(volatile%5C%20gpointer%5C%20G_GNUC_MAY_ALIAS%5C%20%5C*%5C)%5C%20%5C(void%5C%20%5C*%5C)%5C%20%5C(atomic%5C),%5C%20%5C(newval%5C)%5C)%5C)&type=cs&l=76

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