[petsc-dev] meaning of PETSC_USE_EXTERN_CXX?

[Jed Brown]

On Wed, Mar 6, 2013 at 7:24 AM, Matthew Knepley <knepley at gmail.com> wrote:

> This is not about testing at all, its about using. You explicitly stick it
> in CFLAGS.
>

I wanted to keep the code that tested whether the compiler understands
__attribute__((visibility("default"))) and -fvisibility=hidden in
BuildSystem so that it could be reused from other projects.

The option should probably be split into --with-visibility which defaults
to true when available and --with-visibility-hidden which compiles with
-fvisibility=hidden and might only be used for our testing.
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