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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Suggested method for returning a string from a C program?
Date: Fri, 28 Mar 2025 10:57:42 -0700
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scott@slp53.sl.home (Scott Lurndal) writes:

> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>
>> scott@slp53.sl.home (Scott Lurndal) writes:
>>
>>> [...]  I have one
>>> source file that takes almost 7 minutes to compile
>>> when using -O3 on a very-high-end xeon box.  Mostly
>>> buried in the overall compile time when using parallel
>>> make.
>>>
>>> The code could be restructured to compile in a few seconds;
>>> but that would require substantial changes to the rest
>>> of the codebase.   Compiling with -O0 for development
>>> testing reduces the compile time to a few seconds.
>>
>> How long does it take compiling with -O1?
>
> Using -O1 saves 14 seconds on the long-pole.
>
>
> $ time mr -s -j96
>  COMPILE g.cpp
>  BUILD lib/lib_g.so
>  BUILDSO libsim.so.1.0
>  BUILD TARGET sim
>
> real    14m0.76s
> user    13m52.28s
> sys     0m20.13s
>
> $ time md -s -j96
>  COMPILE g.cpp
>  BUILD lib_g.so
>  BUILDSO libsim.so.1.0
>  BUILD TARGET sim
>
> real    13m46.49s
> user    13m42.17s
> sys     0m16.66s
>
> To be clear, we know that this is ridiculous, the generated
> header file totals 1.25 million lines, including a single
> function with over 200,000 SLOC.   Feature creep, antique
> algorithms, screwed up third-party ip-xact collateral and
> tight development schedules.

Thank you.  I was just curious.