[petsc-dev] Need a CFLAGS that does is *not* included in the link

[Jed Brown]

Building PETSc with clang++ produces a warning about compiling *.c as C++
being deprecated. To silence the warning, we would need to pass "-x c++" to
the compiler, but NOT to the linker. CFLAGS is currently also passed to the
linker. Is this something we want to fix?


Clang used to SEGV when "-x c++" is passed to the linker. Now (latest SVN)
it just interprets the object file as C++ source (which obviously produces
a ton of garbage).

http://llvm.org/bugs/show_bug.cgi?id=12924
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