[cfe-dev] Distinguishing between clang Window versions

[Nikola Smiljanic]

It's documented to some extent
http://clang.llvm.org/docs/CrossCompilation.html#target-triple but we could
probably do better here.


On Mon, Jul 14, 2014 at 4:41 AM, Edward Diener <
eldlistmailingz at tropicsoft.com> wrote:

> On 7/8/2014 11:13 AM, Nico Weber wrote:
>
>> On Tue, Jul 8, 2014 at 6:54 AM, Edward Diener
>> <eldlistmailingz at tropicsoft.com
>> <mailto:eldlistmailingz at tropicsoft.com>> wrote:
>>
>>     Since the two versions for clang on Windows, one using VC++ RTL and
>>     emulating VC++ to some small extent and the other using mingw rtl,
>>     are radically different, is there any easy way to distinguish
>>     between them at pre-execution time.
>>
>>     In Boost Build we currently have a single toolset named 'clang' for
>>     the clang compiler. On Linux it uses a clang-linux.jam file, on the
>>     Mac it uses a clang-darwin.jam file, and I am trying to establish
>>     .jam files for using clang on Windows. Essentially I can use the
>>     clang-linux.jam file with a slight modification if the clang version
>>     uses mingw, but I need to use a clang-win.jam file if the clang
>>     version uses VC++. So somewhere early in the Boost Build processing
>>     I have to determine which 'clang.exe' is being used on Windows in
>>     order to invoke the proper Boost Build jam file for it.
>>
>>
>> It's not really to different clang binaries as far as I know, just the
>> same binary with a different default triple. So you could pass an
>> explicit -target parameter to force one compiler behavior over the other
>> too. (-target i386-pc-win32 for VC mode, -target i386-pc-mingw32 for gcc
>> mode)
>>
>
> When using clang --help I see:
>
>  --target=<value>        Generate code for the given target
>
> Is this the target option ( note the -- ) that can be passed to clang to
> change to either VC mode or gcc mode ? If so, are these two values you
> specify above ( "i386-pc-win32" or "i386-pc-mingw32" ) documented anywhere
> ? If this is not the target option you have mentioned, is that target
> option ( maybe with a single - ) documented anywhere ?
>
>
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