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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Build Systems
Date: Mon, 28 Aug 2023 06:48:30 -0700
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Anton Shepelev <anton.txt@g{oogle}mail.com> writes:

> Tim Rentsch to Anton Shepelev:
>
>>> A modular program is one comprising two or more moules,
>>> such as introduced in Modula [...]
>>
>> Modules appeared earlier in the programming language Mesa.
>> Modula copied them from Mesa.
>
> Bad word choice on my part.  I quoted Modula as an example of
> a language with modules, not as the first programming
> language on Earth to support them.  Modula introduced its own
> kind of module.

Okay.

> Now that I have looked up Mesa in Wikipedia, I see that
> Mesa's modules are similar to C's header-source pairs in
> that they consist of at least two files.  Not so in Modula,
> where a module is a single self-contained source file.

Okay.

> Furthermore, Wikipedia lists Modula as predating Mesa by a
> year.

Niklaus Wirth was at Xerox PARC while Mesa was being developed.
It was after that experience that he started working on Modula.