Add helper function to preload some libraries if necessary

[embray]

Following my comments on #24575 I think it might be useful to have a generic helper function for implementing my workaround there.

For now it is Linux-only since we've only explicitly encountered this problem on Linux. I believe LD_PRELOAD may be supported on newer versions of Cygwin, but I haven't specifically encountered the need for this workaround there. It would also have to work a bit differently on OSX (which uses DYLD_INSERT_LIBRARY for this purpose). Again, the need hasn't been specifically encountered on that platform. I'm not sure about other unices either.

CC: @videlec @slel

Component: build

Author: Erik Bray

Branch/Commit: 3ddb719

Reviewer: Vincent Delecroix

Issue created by migration from https://trac.sagemath.org/ticket/24885

[embray]

Author: Erik Bray

[embray]

Branch: u/embray/build/ticket-24885

[embray]

Commit: ba1b5ee

[embray]

New commits:

ba1b5ee

Add helper function that implements the workaround from https://github.com/sagemath/sage-prod/issues/24575 more generically.

[slel]

Description changed:

--- 
+++ 
@@ -1,3 +1,3 @@
 Following [my comments](https://github.com/sagemath/sage/issues/24575#comment:50) on #24575 I think it might be useful to have a generic helper function for implementing my workaround there.
 
-For now it is Linux-only since we've only explicitly encountered this problem on Linux.  I believe `LD_PRELOAD` *may* be supported on newer versions of Cygwin, but I haven't specifically encountered the need for this workaround there.  It would also have to work a bit differently on OSX (which uses `DYLD_INSERT_LIBRARY` for this purpose).  Again, the need hasn't bee specifically encountered on that platform.  I'm not sure about other unices either.
+For now it is Linux-only since we've only explicitly encountered this problem on Linux.  I believe `LD_PRELOAD` *may* be supported on newer versions of Cygwin, but I haven't specifically encountered the need for this workaround there.  It would also have to work a bit differently on OSX (which uses `DYLD_INSERT_LIBRARY` for this purpose).  Again, the need hasn't been specifically encountered on that platform.  I'm not sure about other unices either.

[vbraun]

comment:4

This might be a necessary clutch to get something working, but it is also always a bug in the package build system. We should be working with upstream to point out the issue and fix their build system, not add a framework to Sage so we can ignore those bugs...

[embray]

comment:5

I agree it's ugly, but I don't agree particularly agree that it's an upstream bug. I can think of other cases where having something like this might be useful as well.

The best fix of all for this, from a Sage perspective, is not build and install our own libgc at all if it isn't needed :)

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

3ddb719

Add helper function that implements the workaround from https://github.com/sagemath/sage-prod/issues/24575 more generically.