[petsc-dev] Compiling C code with C compiler

[Sean Farley]

When specifying --with-clanguage=C++ (as required by sieve) all C code (any
.c file) is still compiled with the C++ compiler. This behavior is
deprecated as clang will warn you:

clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior
is deprecated

C is not a subset of C++ and treats structs very differently than C++. This
should really be handled correctly but I can't read the conf/rules file no
more than I can read Greek.

Sean
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