GNU bug report logs - #72697
cmake-build-system sets wrong CMAKE_SYSTEM_NAME when crossbuilding for Hurd

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Dariqq <dariqq <at> posteo.net>
To: bug-guix <at> gnu.org
Subject: cmake-build-system sets wrong CMAKE_SYSTEM_NAME when crossbuilding
 for Hurd
Date: Sun, 18 Aug 2024 13:40:43 +0000

Hi,

I was playing around with a package using cmake and got an error when 
crossbuilding for i586-pc-gnu. The reason seems to be that cmake build 
system only checks for a mingw target and assumes all other targets are 
Linux and sets CMAKE_SYSTEM_NAME accordingly.

I am able to work around it by adding something like

#$@(if (and (%current-target-system)
	    target-hurd?)
       '("-DCMAKE_SYSTEM_NAME=GNU")
       '())

to the configure-flags of my package.


I am unsure how a fix should look like. I was thinking of moving the 
entire crossbuild code out of the build side and instead prepend the 
right configure flags for the target to configure-flags for the cross 
builder kind of similar how meson-build-system does it.

Unfortunately a change like this causes a lot of rebuilds.

Message #10 received at 72697-done <at> debbugs.gnu.org (full text, mbox):

From: Dariqq <dariqq <at> posteo.net>
To: 72697-done <at> debbugs.gnu.org, 68366-done <at> debbugs.gnu.org
Subject: Closing bugs
Date: Tue, 14 Jan 2025 20:07:43 +0000

Hello,

I sent https://issues.guix.gnu.org/72751 to move the cross compile logic 
out of the build side code, also adding GNU as a CMAKE_SYSTEM_NAME with 
a  fallback of Generic.

Because this no longer lives in build code it should now be easier to 
add a new SYSTEM_NAME without recompiling the cmake world.

This is now in master.
 ad672d80d7 * build-system: cmake: Rework cross compilation

So I am closing these.

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