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Message-ID:	<a3fc36ac-9467-474c-ad89-d84eab10a1bf@dronecode.org.uk>
Date:	Sat, 20 Jul 2024 19:18:41 +0100
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Subject:	Re: CYGPORT not setting CMAKE_SYSTEM_PROCESSOR when cross compiling
	with aarch64-w64-mingw32.
To:	"Carlo B." <carlo DOT bramini AT gmail DOT com>
References:	<CADt9577Y5_BM8KeXZ-upOU6P-Lj78W7TUxi37PNCF8G2mr3GYg AT mail DOT gmail DOT com>
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From:	Jon Turney via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
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On 19/07/2024 09:08, Carlo B. via Cygwin wrote:
> Hello,
> 
> GCC development branch includes experimental support Windows on ARM64
> (WOA), which will be officially released next year with version 15, at
> least according to latest news.
> So, I compiled it and I created a number of packages for CYGWIN
> including binutils, gcc, mingw runtime and several libraries, not
> released yet to my repository.
> Although the "aarch64-w64-mingw32" target is still experimental, I
> have to say that this cross compiler worked very well, at least until
> now.

Great work! We'd certainly welcome and appreciate your help getting 
packages for this into our repository, also.

> However, some problems appear because there are some thirdy party
> tools not expecting to have mingw combined with something different
> than i686 or x86_64.
> For example, it is impossible to create a shared library when using
> libtool, more details could be found here:
> https://savannah.gnu.org/support/?111081

Huh. I guess someone should fix that, then!

I think for a start, the regex around line 5724 in libtool (near the 
comment about keeping it in sync with _LT_CHECK_MAGIC_METHOD) needs 
updating to match arm64 archives...

> For this reason, you have to use CMake or other alternative tools
> instead of autotools.
> 
> Actually, another problem can happen when creating the packages for
> CYGWIN with CYGPORT utility.
> For example, I tried to build a noarch package of libpng for CYGWIN,
> by using the new aarch64-w64-mingw32.
> I have used CMake to bypass the above trouble with libtool.
> Unfortunately, the build process still fails because it didn't compile
> the sources for adding the functions with NEON acceleration.
> The cause of the problem is the variable CMAKE_SYSTEM_PROCESSOR that is empty.
> This is not a bug of CMake, because CMAKE_SYSTEM_PROCESSOR is
> typically set into CMAKE_TOOLCHAIN_FILE by the user when cross
> compiling.
> At the moment, I bypassed the trouble by adding
> "-DCMAKE_SYSTEM_PROCESSOR=aarch64" to CYGCMAKE_ARGS into my script.
> I gave a look into /usr/share/cygport/cygclass/cmake.cygclass and it
> seems to me that there is nothing for setting the CPU type.
> Perhaps it would be worth to add support for setting
> CMAKE_SYSTEM_PROCESSOR into cmake.cygclass, by checking the content of
> ${CTARGET}, if it exists with a known CPU.

Interesting.

I took a look and there are several existing packages which have been 
cross-built for x86 and x86_64 MinGW using cmake, so either it seems 
this hasn't yet appeared as a problem for those arches and/or packages...

It's not terribly clear what the valid values are for that cmake 
variable, and what it controls, but the answer [1] makes it seem like 
it's not a lot:

[1] 
https://stackoverflow.com/questions/70475665/what-are-the-possible-values-of-cmake-system-processor

But yeah, this seems eminently fixable in cygport, something like the 
attached I think.


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