Eric Lemings wrote:
-----Original Message-----
From: Martin Sebor [mailto:[EMAIL PROTECTED] On Behalf Of Martin Sebor
Sent: Monday, June 30, 2008 3:54 PM
To: [email protected]
Subject: C++ 0x testing
Unless I'm missing something, C++ 0x testing is currently disabled
in nightly builds. I.e., because tests for the newly added C++ 0x
features are guarded by the _RWSTD_NO_CXX_0X macro and because
_RWSTD_EXT_CXX_0X is not #defined, the tests are compiled into
what essentially amounts an empty main().
With type traits and tuple being nearly done, I think it's time
to start exercising these and any other new components in nightly
builds. One approach that might be easily implementable at least
for gcc is the one suggested in a recent thread: for 4.3.x, add
-std=gnu++0x to the set of compiler options for gcc 4.3 and
beyond, and make _RWSTD_EXT_CXX_0X synonymous with gcc's
__GXX_EXPERIMENTAL_CXX0X__.
Is there a better approach? I'd like to get things set up
sometime this week.
Rather than hard-code the flags, I suggest a command-line make
definition; e.g. make _RWSTD_EXT_CXX_0X=1 ...
I thought this is the way it was originally proposed.
I'm not sure where the _RWSTD_EXT_CXX_0X macro came from or why
C++ 0x is disabled by default even for compilers that it works
with. I remember suggesting _RWSTD_NO_EXT_CXX_0X but not
_RWSTD_EXT_CXX_0X. Of course, it's entirely possible that
I forgot. Travis, what's your insight into this?
Anyways,
the gcc.config flag appends the appropriate compiler flags and
defines only if this make variable is defined; e.g.
ifeq ($(_RWSTD_EXT_CXX_0X),1)
CXXFLAGS += -std=gnu++0x -D_RWSTD_EXT_CXX_0X
endif
I'm suggesting we unconditionally enable it on 4.3.x in builds
with gcc 4.3 (and all other compilers where it's intended to
be tested). IIUC, the approach outlined above won't help us test
the implementation in nightly builds because it'll still leave
C++ 0x disabled unless we also change the buildntest script to
define the make variable the way you show. If we were to take
this approach I don't see the advantage over simply setting
CXXOPTS=-std=gnu++0x instead. It seems to me that most users
are more likely to be familiar and comfortable with using
compiler options than with #defining our config macros.
Martin
