Bug #413: main() needs to return int

• Status: Closed
• Assignee: -
• Target version: -

[pzb (Peter Bowen)]

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According to the C standard, main always needs to be declared to return an int and can take zero or two parameters. It can officially have two declarations:
int main(void)
int main(int, char **)

The attached patch adds the int return to places where it is missing and uses the more portable two parameter declaration for main. It is against the ruby_1_8_6 branch in svn.
=end

[shyouhei (Shyouhei Urabe)]

=begin
No, not really.

Fact (1)

When abbreviated, a function's return value defaults to int. So,
main(int, char*);
is a 100% conforming declaration of main function for C89.

Fact (2)

IEEE Std 1003.1 says in its rationale:
"Implementations are required to support the two-argument calling
sequence, but this does not prohibit an implementation from
supporting envp as an optional third argument."
So optional third argument of main is not a bad habit.
=end

[pzb (Peter Bowen)]

=begin
On (1), the return value defaulting to int was removed in C99 (ISO/IEC 9899:1999). If the target for ruby is C89/C90, then this is fine.

Fair enough on (2).

I'm mostly trying to clean out some out of tree patches that we have been carrying around. I will take this as a reject and drop the patch.
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[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

=begin
Applied in changeset r18459.
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[nobu (Nobuyoshi Nakada)]

=begin
Hi,

At Sat, 9 Aug 2008 11:03:13 +0900,
Shyouhei Urabe wrote in [ruby-core:18213]:

So optional third argument of main is not a bad habit.

That envp was used in 0.95 but it hasn't been used in 1.0
already. Seems to no longer need to be there.

--
Nobu Nakada

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