Re: Settings for parallel make jobs not applied

On Thu, 2022-09-29 at 10:04 +0000, md wrote:
> I'm having problems with switching on 2 parallel make jobs.
> Assuming this problem is resolved, is it still a valid recommendation to
> exclude gcc from the parallel builds?

No. gcc has been removed from blacklist long ago.

> It's the package that takes most time to build.
> 
> Section 5. RUNNING of https://wiki.linuxfromscratch.org/alfs/browser/README
> mentions
> [...]
> 
> Here is how I'm trying to configure make to use two jobs.
> After enabling "Optimization Settings" in "make", the "jhalfs run" shows the
> following, relevant output
> ```
> ...
> OPTIMIZE <2>
> N_PARALLEL <2>
> 

seems ok

> [...]
> 
> Despite this, the generated makefiles use -j1, except for 843-automake, which
> uses -j4. These settings seem hard-coded in the lfs book XML.
> ```
> grep j1 -r $LFS/jhalfs/lfs-commands/ | tail -1
> $LFS/jhalfs/lfs-commands/chapter06/607-findutils:make -j1 DESTDIR=$LFS install
> grep j1 -r $LFS/jhalfs/lfs-commands/ | wc -l
> 99
> grep j2 -r $LFS/jhalfs/lfs-commands/
> grep j4 -r $LFS/jhalfs/lfs-commands/
> $LFS/jhalfs/lfs-commands/chapter08/843-automake:# make -k -j4 check >>
> $TEST_LOG 2>&1 || true
> ```

All of this is normal, and does not mean -j1 is used everywhere: all the "make
install" commands are changed to "make -j1 install" by jhalfs, because the main
"Makefile" passes MAKEFLAGS=-j<selected number of jobs> to the scripts. So,
you'll never find "make -jx" in the scripts (the -j flag is in MAKEFLAGS)
except:
- if the book explicitly passes a -jx flags, it takes precedence
- and there are a lot of "-j1" in the "make install" commands.

> 
> Currently I'm using sed to adjust the selected -j1 make settings for the
> packages with the longest build times.
> ```
> cd $LFS/jhalfs
> for file in $(find lfs-commands -name "*gcc*" -o -name "*glibc*");
> do
> echo $file && sed -i "s/make -j./make -j2/" $file
> done
> ```

Not needed, see above


> [...]

Pierre

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