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

[Larry Evans]

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?

TIA.

-Larry