[LLVMbugs] [Bug 12827] New: COVERED_SWITCH_DEFAULT is misdetected as supported

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12827

             Bug #: 12827
           Summary: COVERED_SWITCH_DEFAULT is misdetected as supported
           Product: Build scripts
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: autoconf
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: austinenglish at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8560
  --> http://llvm.org/bugs/attachment.cgi?id=8560
hack to disable that flag

With a fresh checkout of llvm/clang, I tried to build out of tree:
$ rm -rf build
$ cd build
$ ../configure --enable-optimized

configure detects -Wcovered-switch-default as supported:
#checking optional compiler flags... -Wno-variadic-macros
-Wno-missing-field-initializers -Wcovered-switch-default

(as it should, since a recent clang is installed in /usr/local/bin). If I run
make, however:
austin at debian-buildbot:~/src/llvm/build$ make
make[1]: Entering directory `/home/austin/src/llvm/build/lib/Support'
llvm[1]: Compiling regcomp.c for Release+Asserts build
cc1: error: unrecognized command line option "-Wcovered-switch-default"
/bin/rm: cannot remove
`/home/austin/src/llvm/build/lib/Support/Release+Asserts/regcomp.d.tmp': No
such file or directory
make[1]: ***
[/home/austin/src/llvm/build/lib/Support/Release+Asserts/regcomp.o] Error 1
make[1]: Leaving directory `/home/austin/src/llvm/build/lib/Support'
make: *** [all] Error 1

my workaround has been to hack out support from the makefiles, then it compiles
fine.

I get the same error if I use gcc-4.5.3 to compile, which lacks support for
that flag.

OS is debian testing, 32-bit.

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