[Development] About the presence of /System/Library/Frameworks/Carbon.framework

Konstantin Tokarev annulen at yandex.ru
Thu Jan 4 21:35:38 CET 2018

04.01.2018, 17:51, "Edward Welbourne" <edward.welbourne at qt.io>:
> René J.V. Bertin:
>>>>  Here's a silly one: configuring Qt for building on my Linux rig I was told
>>>>  that I needed Xcode, and how to get it. :)
>>>>  Long story short, it turns out that the configure script determines
>>>>  whether it's building on Mac by checking if the Carbon framework exists
>>>>  in the designated location. And it turns out that I copied over the
>>>>  entire header dir. structure under /System/Library/Frameworks onto said
>>>>  Linux rig because I use it for cross-platform development.
>>>>  Apart from the fact that it should probably check for a framework with a
>>>>  more certain future, isn't there a less "rootsy" way of determining
>>>>  whether the script is running on Mac?
> On quinta-feira, 21 de dezembro de 2017 04:47:34 CST Konstantin Tokarev wrote:
>>>  Check uname maybe?
> Thiago Macieira (21 December 2017 12:54) replied:
>>  That would tell you the host you're running on, not the target you're
>>  compiling to.
>>  If your sysroot contains Apple files, it's reasonable to conclude it's an
>>  Apple system.
> Well, it's reasonable to conclude you're set up to be capable of
> compiling for an Apple system; as here, it's possible this may be for
> the sake of cross-compiling; but the fact of having the means to
> cross-compile for a particular target does not mean that every build
> done on this machine necessarily is a cross-compile for that target.
> It does sound like we're a little too enthusiastic about jumping to a
> conclusion here - is there a better way to decide what we're compiling
> for ? Surely we should ignore uname if configure has options that
> explicitly ask for cross-compilation; but it's a reasonable thing to
> consult otherwise, when auto-detecting in the absence of explicit
> instructions - in particular, more to be trusted than the existence of
> (possibly non-native) frameworks,

Note that in opening letter different question was asked, namely how to
detect if script is running on Mac or not, presumably to avoid asking Linux
users to install Xcode.

>         Eddy.
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