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Re: [PATCH v2 01/13] packfile.h: drop extern from function declarations

Jeff King <peff@xxxxxxxx> writes:

> On Fri, Apr 05, 2019 at 08:19:30PM +0100, Ramsay Jones wrote:
>> >  /* global flag to enable extra checks when accessing packed objects */
>> > -extern int do_check_packed_object_crc;
>> > +int do_check_packed_object_crc;
>> ... removing this 'extern' on an int variable sends 'sparse'
>> into a frenzy of warnings! :-D
>> [You didn't use a global s/extern// by any chance?]
> Oh my. I did look at each one, but probably via replace-and-confirm in
> vim. I don't know how I managed to botch that one so badly.

Perhaps we should keep 'extern' even when declaring (not defining) a
public function in the header file to avoid a gotcha like this?

What was the reasoning behind the insn in CodingGuidelines?  "As it
is already the default" does qualify as a reasonable justification
for telling "extern is not needed for functions" to our readers, but
not quite enough for "extern should not be used for functions".