[cfe-dev] svn update then make gives cc1 error: unrecognized command line option '-Wcovered-switch-default'

[Larry Evans]

On 10/05/12 20:31, Eli Friedman wrote:
> On Fri, Oct 5, 2012 at 5:58 PM, Larry Evans <cppljevans at suddenlink.net> wrote:
>> On 10/05/12 19:35, Eli Friedman wrote:
>>> On Fri, Oct 5, 2012 at 5:25 PM, Larry Evans <cppljevans at suddenlink.net> wrote:
>>>> On 10/05/12 13:32, Larry Evans wrote:
>>>>   I just ran svn update:
>>>>
>>>>   ~/download/llvm/svn/llvm $ svn update
>>>>   ~/download/llvm/svn/llvm/tools/clang $ svn update
>>>>   ~/download/llvm/svn/llvm/tools $ svn co
>>>>   http://llvm.org/svn/llvm-project/clang-tools-extra/trunk extra
>>>>   ~/download/llvm/svn/llvm/projects/compiler-rt $ svn update
>>>>
>>>>   However, make resulted in:
>>>>
>>>>   .
>>>>   .
>>>>   .
>>>>   llvm[1]: Compiling regexec.c for Debug+Asserts build
>>>>   cc1: error: unrecognized command line option "-Wcovered-switch-default"
>>>>   /bin/rm: cannot remove
>>>>
>>>> `/home/evansl/download/llvm/svn/build/lib/Support/Debug+Asserts/regexec.d.tmp':
>>>>   No such file or directory
>>>>   make[1]: ***
>>>>   [/home/evansl/download/llvm/svn/build/lib/Support/Debug+Asserts/regexec.o]
>>>>   Error 1
>>>>   make[1]: Leaving directory
>>>>   `/home/evansl/download/llvm/svn/build/lib/Support'
>>>>   make: *** [all] Error 1
>>>>   ~/download/llvm/svn/build $
>>>>
>>>>   How can this be corrected?
>>>>
>>>>   My system is:
>>>>
>>>>   uname -a
>>>>   Linux evansl-desktop 2.6.32-41-generic #90-Ubuntu SMP Tue May 22
>>>>   11:29:51 UTC 2012 x86_64 GNU/Linux
>>>>
>>>>   TIA.
>>>>
>>>>   -regards,
>>>>   Larry
>>>> SOLVED:
>>>>
>>>> Changed Makefile.config to remove the COVERED_SWITCH_DEFAULT macro,
>>>> and now it's working:
>>>>
>>>>   ~/download/llvm/svn/build $ cat Makefile.config|grep switch
>>>>   # -Wcovered-switch-default
>>>>   #COVERED_SWITCH_DEFAULT = -Wcovered-switch-default
>>>>   ~/download/llvm/svn/build $ make
>>>>   llvm[0]: Constructing LLVMBuild project information.
>>>>   make[1]: Entering directory
>>>> `/home/evansl/download/llvm/svn/build/lib/Support'
>>>>   llvm[1]: Compiling regexec.c for Debug+Asserts build
>>>>   llvm[1]: Compiling system_error.cpp for Debug+Asserts build
>>>>   llvm[1]: Building Debug+Asserts Archive Library libLLVMSupport.a
>>>
>>> Err, this is a guess, but it's possible you're setting the C++
>>> compiler to clang++, but not setting the C compiler to clang.
>>>
>>> -Eli
>>
>> Thanks Eli.
>>
>> I've not set anything directly.  I did do the configure step:
>>
>> ~/download/llvm/svn/llvm $ cd ..
>> ~/download/llvm/svn $ cd build
>> ~/download/llvm/svn/build $ ls ../llvn/configure
>> ../llvn/configure: No such file or directory
>> ~/download/llvm/svn/build $ ls ../llvm/configure
>> ../llvm/configure
>> ~/download/llvm/svn/build $ ../llvm/configure
>> checking for clang... no
>> checking for llvm-gcc... no
>> checking for gcc... gcc
>> .
>> .
>> .
>>
>> and maybe that did what you say.  Hmmm.  This is not the
>> 1st time I've built clang; so, maybe something's left over
>> from the last build.
>>
>> Where would I check to see which compiler is being used?
> 
> You can look in config.log for lines starting with CC= and CXX= .
> 
> -Eli
Thanks,  config.log contains:

CC='gcc'

and:

CXX='clang++'