[TUHS] Building programs (Re: Version 256 of systemd boasts '42% less Unix philosophy' The Register

[Chet Ramey via TUHS]

On 6/20/24 7:35 PM, Alexis wrote:

> i believe the idea is not for precomputing to be done by _builds_, but to 
> be done on and for a given machine and its configuration, independent of 
> any specific piece of software, which is then _queried_ by builds. That 
> precomputation would only need to be re-run when one of the things under 
> its purview changes.

This is the rationale behind local (package-specific) and global (site-
specific) versions of config.cache and `configure -C'. I use them all the
time; they reduce configuration time considerably. (But then, I am probably
building more often than someone who just downloads a source tarball,
builds it, and installs the result.)

> If i compile something on one of my OpenBSD boxen in the morning, and then 
> compile some other thing in the afternoon, without an OS upgrade 
> in-between, autoconf isn't going to find that libc.so has changed 
> in-between. 

configure and config.cache compute the results for a given build
environment. If you change that, whose responsibility is it to update the
dependencies?

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet at case.edu    http://tiswww.cwru.edu/~chet/

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