[petsc-dev] getting rid of clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated

[Jed Brown]

Barry Smith <barryfsmith at me.com> writes:

>   Jed,
>
>    Could gmakefile be modified with 
>
> PETSC_COMPILE.cxx = $(call quiet,CXX) -c $(CXX_FLAGS) $(CFLAGS) $(CCPPFLAGS) $(CXX_DEPFLAGS) $(CXX_X_FLAG)
>
> and 
>
> CXX_X_FLAG set to -x c++   
>
> by configure when it works to get rid of that damn clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated 
>
> message?

It could, but the problem is that if this option is ever passed (perhaps
accidentally) when you run the compiler on something that is not C++
source, the compiler will SEGV (this bug is now fixed) or do something
nonsensical.  For example

  clang++ -x c++ foo.o -o foo

It should be able to go in CCPPFLAGS, provided it is never used incorrectly.
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