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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c++
Subject: Re: Now this is just annoying.
Date: Sun, 02 Feb 2025 15:22:07 -0800
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Xref: csiph.com comp.lang.c++:121483

scott@slp53.sl.home (Scott Lurndal) writes:
> $ gcc --version
> gcc (GCC) 14.2.1 20240912 (Red Hat 14.2.1-3)
>
> $ g++ -O3  -o /tmp/a /tmp/a.cpp  
> /tmp/a.cpp:4:1: warning: 'int main(int, const char**, const char**, const char**)' takes only zero or two arguments [-Wmain]
>     4 | main(int argc, const char **argv, const char **envp, const char **auxv)
>       | ^~~~
>
> So much for backward compatibility and support for the original C++ operating
> environment (unix).

Backward compatibility is exactly what you're seeing here.

g++ is warning you that your main function doesn't have one of the two
forms required by the C++ standard, but it's still compiling it.
You can even disable the warning with "-Wno-main".

BTW, the warning is slightly misleading.  It's not emitted if main is
defined with 3 parameters (argc, argv, envp).

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */