Bug#1096811: hipblas: ftbfs with GCC-15

[Helmut Grohne <helmut@subdivi.de>]

Hi Santiago and Cordell,

On Wed, Nov 19, 2025 at 01:40:11PM +0100, Santiago Vila wrote:
> In fact, I can build the package on machines with 16 GB of RAM having
> 1 CPU but not on machines with 16 GB having 2 CPUs, where I get this:
> 
> c++: fatal error: Killed signal terminated program cc1plus
> compilation terminated.
> 
> Could you please adjust the number of CPUs to be used according
> to available memory?

This is one of those cases that I created guess-concurrency (Debian 
package available since trixie) for. Where you would normally consume 
the value N of DEB_BUILD_OPTIONS=parallel=N, you might instead use the 
output of:

    guess_concurrency --require-mem 14G

It will honour DEB_BUILD_OPTIONS and output a suitable concurrency 
number such that the system memory is not exceeded (taking control 
groups into account). The tuning of the parameter requires some 
guesswork. At least you avoid the /proc file parsing present in 
Santiago's variant.

QA folks thank you for supporting builing on lower memory systems.

Helmut