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builtin/config: work around an unsized array forward declaration

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As reported here[0], Microsoft Visual Studio 2017.2 and "gcc -pedantic"
don't understand the forward declaration of an unsized static array.
They insist on an array size:

    d:\git\src\builtin\config.c(70,46): error C2133: 'builtin_config_options': unknown size

The thread [1] explains that this is due to the single-pass nature of
old compilers.

To work around this error, introduce the forward-declared function
usage_builtin_config() instead that uses the array
builtin_config_options only after it has been defined.

Also use this function in all other places where usage_with_options() is
called with the same arguments.

[0]: https://github.com/git-for-windows/git/issues/1735
[1]: https://groups.google.com/forum/#!topic/comp.lang.c.moderated/bmiF2xMz51U

Fixes https://github.com/git-for-windows/git/issues/1735

Reported-By: Karen Huang (via GitHub)
Signed-off-by: Beat Bolli <dev+git@drbeat.li>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Beat Bolli 2018-07-05 20:34:45 +02:00 committed by Junio C Hamano
parent 63e2a0f8e9
commit 6aaded5509
1 changed files with 15 additions and 12 deletions
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27
builtin/config.c
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@ -67,7 +67,7 @@ static int show_origin;
{ OPTION_CALLBACK, (s), (l), (v), NULL, (h), PARSE_OPT_NOARG | \
PARSE_OPT_NONEG, option_parse_type, (i) }
static struct option builtin_config_options[];
static NORETURN void usage_builtin_config(void);
static int option_parse_type(const struct option *opt, const char *arg,
int unset)
@ -111,8 +111,7 @@ static int option_parse_type(const struct option *opt, const char *arg,
* --type=int'.
*/
error("only one type at a time.");
usage_with_options(builtin_config_usage,
builtin_config_options);
usage_builtin_config();
}
*to_type = new_type;
@ -157,11 +156,16 @@ static struct option builtin_config_options[] = {
OPT_END(),
};
static NORETURN void usage_builtin_config(void)
{
usage_with_options(builtin_config_usage, builtin_config_options);
}
static void check_argc(int argc, int min, int max) {
if (argc >= min && argc <= max)
return;
error("wrong number of arguments");
usage_with_options(builtin_config_usage, builtin_config_options);
usage_builtin_config();
}
static void show_config_origin(struct strbuf *buf)
@ -596,7 +600,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
if (use_global_config + use_system_config + use_local_config +
!!given_config_source.file + !!given_config_source.blob > 1) {
error("only one config file at a time.");
usage_with_options(builtin_config_usage, builtin_config_options);
usage_builtin_config();
}
if (use_local_config && nongit)
@ -657,12 +661,12 @@ int cmd_config(int argc, const char **argv, const char *prefix)
if ((actions & (ACTION_GET_COLOR|ACTION_GET_COLORBOOL)) && type) {
error("--get-color and variable type are incoherent");
usage_with_options(builtin_config_usage, builtin_config_options);
usage_builtin_config();
}
if (HAS_MULTI_BITS(actions)) {
error("only one action at a time.");
usage_with_options(builtin_config_usage, builtin_config_options);
usage_builtin_config();
}
if (actions == 0)
switch (argc) {
@ -670,25 +674,24 @@ int cmd_config(int argc, const char **argv, const char *prefix)
case 2: actions = ACTION_SET; break;
case 3: actions = ACTION_SET_ALL; break;
default:
usage_with_options(builtin_config_usage, builtin_config_options);
usage_builtin_config();
}
if (omit_values &&
!(actions == ACTION_LIST || actions == ACTION_GET_REGEXP)) {
error("--name-only is only applicable to --list or --get-regexp");
usage_with_options(builtin_config_usage, builtin_config_options);
usage_builtin_config();
}
if (show_origin && !(actions &
(ACTION_GET|ACTION_GET_ALL|ACTION_GET_REGEXP|ACTION_LIST))) {
error("--show-origin is only applicable to --get, --get-all, "
"--get-regexp, and --list.");
usage_with_options(builtin_config_usage, builtin_config_options);
usage_builtin_config();
}
if (default_value && !(actions & ACTION_GET)) {
error("--default is only applicable to --get");
usage_with_options(builtin_config_usage,
builtin_config_options);
usage_builtin_config();
}
if (actions & PAGING_ACTIONS)