[petsc-dev] meaning of PETSC_USE_EXTERN_CXX?

[Jed Brown]

On Tue, Mar 5, 2013 at 5:49 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

> From the below I am assuming that PETSC_USE_EXTERN_CXX is equivalent to
> --with-c-support   Is this correct?
>

Yes,

config/PETSc/utilities/languages.py-    '''Check c-support c++-support and
other misc tests'''
config/PETSc/utilities/languages.py-    if self.clanguage == 'Cxx' and
self.framework.argDB['with-c-support']:
config/PETSc/utilities/languages.py-      self.cSupport = 1
config/PETSc/utilities/languages.py:      self.addDefine('USE_EXTERN_CXX',
'1')
config/PETSc/utilities/languages.py-      self.framework.logPrint('Turning
off C++ name mangling')
config/PETSc/utilities/languages.py-    else:
config/PETSc/utilities/languages.py-      self.cSupport = 0


Matt, what is this about?

config/PETSc/utilities/languages.py-  def configureExternC(self):
config/PETSc/utilities/languages.py-    '''Protect C bindings from C++
mangling'''
config/PETSc/utilities/languages.py-    if self.clanguage == 'C':
config/PETSc/utilities/languages.py:      self.addDefine('USE_EXTERN_CXX','
')
config/PETSc/utilities/languages.py-    return
config/PETSc/utilities/languages.py-
config/PETSc/utilities/languages.py-  def configureFortranLanguage(self):


>
>    And I assume that --with-c-support means that PETSc is compiled with
> C++ but does not use name mangling   Is this correct?
>

Yes


>
>    If the above two are correct does the name PETSC_USE_EXTERN_CXX
> actually correlate to what it means? Could it be changed to something
> meaningful?
>

--with-extern-c-interface (or --with-c-interface) and
PETSC_USE_EXTERN_C_INTERFACE?


>
>     Please explain,
>
>      Barry
>
>
> #if defined(PETSC_CLANGUAGE_CXX) && !defined(PETSC_USE_EXTERN_CXX) &&
> !defined(__cplusplus)
> #error "PETSc configured with --with-clanguage=c++ and NOT
> --with-c-support - it can be used only with a C++ compiler"
> #endif
>
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