[Scons-users] compiler detection

[Kraus Philipp]

Am 30.10.2012 um 06:08 schrieb Evan Driscoll:


> On 10/29/2012 9:16 PM, Evan Driscoll wrote:

>> SCons will always behave the same regardless of how you start it. If

>> 'scons' runs the native SCons, it will always use cmd.exe by default

>> regardless of whether it is being started under Cygwin or cmd. If

>> 'scons' runs Cygwin SCons, then it will always use Cygwin's sh.exe by

>> default regardless of whether it is being started under Cygwin or cmd.

>> (But see below.)

> 

> Actually my rant there, while *mostly* right, has some inaccuracies.

> What matters is not where SCons per se came from but rather what Python

> is used to run it. So if you install SCons for native Python but then

> run it with Cygwin Python, you'll get Cygwin behavior (SHELL is sh and

> CC is gcc); if you install SCons for Cygwin Python but then run it with

> native Python, you'll get native behavior (SHELL is cmd.exe and CC is

> cl). There is no MinGW/MSYS Python (at least as far as I know), so

> that's not an option.


Yes there exist not "msys-python", you should use the native python package.
I use Scons Windows installer with the native python.


> Also, it's easier to run native SCons from a Cygwin shell than I

> thought: you just have to explicitly say 'scons.bat' instead of just

> 'scons'.


You're right, but there is a little problem on Cygwin. Cygwin uses always its
cygwin.dll, so each programm / library, that is compiled under Cygwin is linked
to this DLL. I can disable with -mo-cygwin this linking option, but some library like
Atlas & LAPack does not work anymore. On the dll exists also a licence, that are
added to the compiled programs, so in some cases Cygwin can make some problems.
Hence I would like to add also a naitive toolset for building my project. I need also the
autotools & make, so I must use MSYS / MinGW.

I run my scons build script on OSX 10.5 - 10.8, different Linux (Gentoo, Mint, Ubuntu) and Windows (Cygwin & MSYS),
so can I send the environment detection to this list, I think someone else can use this

Phil