Re: multi-threaded compiling

[alex xmb sw ratchev]

On Tue, Mar 12, 2024, 12:49 Greg Wooledge <greg@wooledge.org> wrote:

> On Tue, Mar 12, 2024 at 09:42:22AM +0100, Mischa Baars wrote:
> > Here's the script and the Makefile using "printf '<%s>'":
>
> Sadly, your mail user agent chose to attach "Makefile" with content-type
> application/octet-stream, which my MUA (mutt) refuses to show inline,
> or to include in a reply as quoted text.
>
> Here's the top part of it, inline:
>
>
> STR[0]="one and two"
> STR[1]=one\ and\ two
>
> CFLAGS[0]=-D__STRINGIZED__=0 -D__STRING__=${STR[0]}
> CFLAGS[1]=-D__STRINGIZED__=0 -D__STRING__=${STR[1]}
> CFLAGS[2]=-D__STRINGIZED__=1 -D__STRING__=${STR[0]}
> CFLAGS[3]=-D__STRINGIZED__=1 -D__STRING__=${STR[1]}
>
>
> And here's what Martin said about it:
>
> > On Tue, Mar 12, 2024 at 9:32 AM Martin D Kealey <martin@kurahaupo.gen.nz
> >
> > wrote:
> > > In section two, the problem is that quote removal is done BEFORE
> variables
> > > are expanded, even though it prevents word splitting from being done
> AFTER
> > > variable expansion. Therefore writing VAR=" \"string 1\" \"string 2\" "
> > > absolutely cannot do what you might expect; the embedded quote marks
> will
> > > be used literally, and then (because ${CFLAGS[0]} is not quoted) the
> > > resulting string will be split on any embedded whitespace..
>
>
> As someone said yesterday, you will need eval for this.
>
>
> hobbit:/tmp/x$ cat Makefile
> FOO=-D__x="one two three"
>
> all:
>         @bash -c 'eval '\''CFLAGS=${FOO}'\''; declare -p CFLAGS'
> hobbit:/tmp/x$ make
> declare -- CFLAGS="-D__x=one two three"
>
>
> Of course, using eval presents its own set of challenges, so proceed
> with extreme caution.
>

declare instead of eval

I'd still like to hear why you aren't simply using "make -j".
>
>