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

[Larry Evans]

On 10/05/12 20:48, Eli Friedman wrote:
> On Fri, Oct 5, 2012 at 6:38 PM, Larry Evans <cppljevans at suddenlink.net> wrote:
>> 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++'
> 
> Okay.  I suppose that's theoretically a combination we should support,
> but I doubt anyone cares in practice.
> 
> What's the output of "which clang" and "which clang++"?  Do you have
> CC or CXX set in your environment?
> 
> -Eli

Thanks Eli.

Here's the info:

evansl at evansl-desktop:~/bin$ echo $CC

evansl at evansl-desktop:~/bin$ echo $CXX

evansl at evansl-desktop:~/bin$ which clang
evansl at evansl-desktop:~/bin$ which clang++
/home/evansl/bin/clang++
evansl at evansl-desktop:~/bin$ ls -l ~/bin/clang++
lrwxrwxrwx 1 evansl evansl 62 Feb  6  2011 /home/evansl/bin/clang++ ->
/home/evansl/download/llvm/svn/build/Debug+Asserts/bin/clang++
evansl at evansl-desktop:~/bin$

Maybe if I made another symlink in ~/bin to
  home/evansl/download/llvm/svn/build/Debug+Asserts/bin/clang
everything would work as expected.