Dear Joe, Chris, Swift Community,
Here is my quick fire view.
What about adding a builtin directive called environ(...) for holding
OS-specific environmental differences. So in the case of Windows, we would
potentially have environ(msvc), environ(cygwin), environ(mingw),
environ(nano) etc. Thus, having environment as a separate builtin directive
allows Swift and its users to cleanly handle significant divergence on a
single operating system by way of combinations.
Similarly, an environ(posix) could also be added in the same spirit, in the
future, if required, if a POSIX specific environment is required.
The good thing about the above is that it can be intuitively used to build
combinations such as the following and has good readability:
// ... common stuff to Windows in general
#if environ(Cygwin) and arch(x86_64)
// ... specific stuff of Cygwin on 64-bit arch
// ... stuff specific to MSVC generally
// ... Non Windows stuff.
Chris, for your reference, the following is how D does it:
https://dlang.org/spec/version.html#predefined-versions. TL;DR - precursory
look indicates that they cobble everything into version() with predefined
I have specifically left out any comments on OS versions such as Vista,
Windows 7 etc., as I am not sure on how it should be handled, either
presently or as a proposal. As for Cygwin and MinGW, I am not sure if it
should be called cygwin32 and mingw32 with their 64-bit analogues,
respectively, but AFAICS, not suffixing with 32 and 64 seems much cleaner.
On Wed, 4 May 2016 at 05:41, Chris Lattner via swift-evolution < email@example.com> wrote:
> On May 3, 2016, at 9:39 PM, Joe Groff <firstname.lastname@example.org> wrote:
>> On May 3, 2016, at 9:27 PM, Chris Lattner via swift-evolution < > email@example.com> wrote:
>> MSVC and MinGW (again, AFAIK) use the same C ABI, and thus could be
treated as the same target.
> Part of the problem is that MSVC and Mingw *don't* share a C ABI or
runtime. Only 'stdcall' and COM stuff from the Win32 system APIs is
portable between them at the binary level.
I thought that MinGW worked with the system libc?
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