* [PATCH 0/2] mingw: macro main(), const warnings
@ 2014-05-29 10:43 Stepan Kasal
2014-05-29 10:45 ` [PATCH 1/2] Win32: move main macro to a function Stepan Kasal
2014-05-29 10:47 ` [PATCH 2/2] mingw: avoid const warning Stepan Kasal
0 siblings, 2 replies; 9+ messages in thread
From: Stepan Kasal @ 2014-05-29 10:43 UTC (permalink / raw
To: GIT Mailing-list; +Cc: Erik Faye-Lund, msysgit, Karsten Blees
Hello,
mingw.h defines a preprocessor macro main(), so that it can wrap the
original function and hoook into initialization.
The real main() function can have different types of its second
parameter (char**, const char**, char*[]). It is not easy to match
the type and gcc issues a const warning. My patch fixes that.
There were solutions for the same issue published ([1], [2]), but
none of them appeared in junio/pu. This new solution should be more
future proof, as it modifies only compat/mingw.h; the *.c files can
have any of the types mentioned above.
I promise to take care of the integration into msysGit if this patch
gets accepted. To make it easier, I'm submitting a patch that has
been part of msysGit for 3 years.
Karsten Blees (1):
Win32: move main macro to a function
Stepan Kasal (1):
mingw: avoid const warning
compat/mingw.c | 15 +++++++++++++++
compat/mingw.h | 17 ++++++-----------
2 files changed, 21 insertions(+), 11 deletions(-)
--
1.9.2.msysgit.0.496.g23aa553
[1] a hack to fix the warning, by Pat Thoyts, in msysGit since
1.8.5.2.msysgit.0 (Dec 2013):
https://github.com/msysgit/git/commit/6949537a
[2] more elgant fix:
From: Marat Radchenko <marat@slonopotamus.org>
Date: Tue, 29 Apr 2014 13:12:02 +0400
http://article.gmane.org/gmane.comp.version-control.git/247535
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^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH 1/2] Win32: move main macro to a function
2014-05-29 10:43 [PATCH 0/2] mingw: macro main(), const warnings Stepan Kasal
@ 2014-05-29 10:45 ` Stepan Kasal
2014-05-29 10:47 ` [PATCH 2/2] mingw: avoid const warning Stepan Kasal
1 sibling, 0 replies; 9+ messages in thread
From: Stepan Kasal @ 2014-05-29 10:45 UTC (permalink / raw
To: GIT Mailing-list; +Cc: Erik Faye-Lund, msysgit, Karsten Blees
From: Karsten Blees <blees@dcon.de>
Date: Fri, 7 Jan 2011 19:47:23 +0100
The code in the MinGW main macro is getting more and more complex, move to
a separate initialization function for readabiliy and extensibility.
Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
---
compat/mingw.c | 15 +++++++++++++++
compat/mingw.h | 14 ++++----------
2 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/compat/mingw.c b/compat/mingw.c
index a0e13bc..c03bafa 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1847,3 +1847,18 @@ int mingw_offset_1st_component(const char *path)
return offset + is_dir_sep(path[offset]);
}
+
+void mingw_startup()
+{
+ /* copy executable name to argv[0] */
+ __argv[0] = xstrdup(_pgmptr);
+
+ /* initialize critical section for waitpid pinfo_t list */
+ InitializeCriticalSection(&pinfo_cs);
+
+ /* set up default file mode and file modes for stdin/out/err */
+ _fmode = _O_BINARY;
+ _setmode(_fileno(stdin), _O_BINARY);
+ _setmode(_fileno(stdout), _O_BINARY);
+ _setmode(_fileno(stderr), _O_BINARY);
+}
diff --git a/compat/mingw.h b/compat/mingw.h
index 3eaf822..15f0c9d 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -363,22 +363,16 @@ void free_environ(char **env);
extern CRITICAL_SECTION pinfo_cs;
/*
- * A replacement of main() that ensures that argv[0] has a path
- * and that default fmode and std(in|out|err) are in binary mode
+ * A replacement of main() that adds win32 specific initialization.
*/
+void mingw_startup();
#define main(c,v) dummy_decl_mingw_main(); \
static int mingw_main(c,v); \
int main(int argc, char **argv) \
{ \
- extern CRITICAL_SECTION pinfo_cs; \
- _fmode = _O_BINARY; \
- _setmode(_fileno(stdin), _O_BINARY); \
- _setmode(_fileno(stdout), _O_BINARY); \
- _setmode(_fileno(stderr), _O_BINARY); \
- argv[0] = xstrdup(_pgmptr); \
- InitializeCriticalSection(&pinfo_cs); \
- return mingw_main(argc, argv); \
+ mingw_startup(); \
+ return mingw_main(__argc, __argv); \
} \
static int mingw_main(c,v)
--
1.9.2.msysgit.0.496.g23aa553
--
--
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^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH 2/2] mingw: avoid const warning
2014-05-29 10:43 [PATCH 0/2] mingw: macro main(), const warnings Stepan Kasal
2014-05-29 10:45 ` [PATCH 1/2] Win32: move main macro to a function Stepan Kasal
@ 2014-05-29 10:47 ` Stepan Kasal
2014-06-06 15:08 ` Karsten Blees
1 sibling, 1 reply; 9+ messages in thread
From: Stepan Kasal @ 2014-05-29 10:47 UTC (permalink / raw
To: GIT Mailing-list; +Cc: Erik Faye-Lund, msysgit, Karsten Blees
Fix const warnings in http-fetch.c and remote-curl.c main() where is
argv declared as const.
The fix should work for all future declarations of main, no matter
whether the second parameter's type is "char**", "const char**", or
"char *[]".
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
---
compat/mingw.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/compat/mingw.h b/compat/mingw.h
index 15f0c9d..8745d19 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -369,10 +369,11 @@ extern CRITICAL_SECTION pinfo_cs;
void mingw_startup();
#define main(c,v) dummy_decl_mingw_main(); \
static int mingw_main(c,v); \
-int main(int argc, char **argv) \
+int main(c, char **main_argv_not_used) \
{ \
+ typedef v, **argv_type; \
mingw_startup(); \
- return mingw_main(__argc, __argv); \
+ return mingw_main(__argc, (argv_type)__argv); \
} \
static int mingw_main(c,v)
--
1.9.2.msysgit.0.496.g23aa553
--
--
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^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH 2/2] mingw: avoid const warning
2014-05-29 10:47 ` [PATCH 2/2] mingw: avoid const warning Stepan Kasal
@ 2014-06-06 15:08 ` Karsten Blees
2014-06-06 19:13 ` Junio C Hamano
0 siblings, 1 reply; 9+ messages in thread
From: Karsten Blees @ 2014-06-06 15:08 UTC (permalink / raw
To: Stepan Kasal, GIT Mailing-list; +Cc: Erik Faye-Lund, msysgit
Am 29.05.2014 12:47, schrieb Stepan Kasal:
> Fix const warnings in http-fetch.c and remote-curl.c main() where is
> argv declared as const.
>
> The fix should work for all future declarations of main, no matter
> whether the second parameter's type is "char**", "const char**", or
> "char *[]".
I'm 100% in favor of a solution that doesn't restrict main to non-const char**! Thanks.
> Signed-off-by: Stepan Kasal <kasal@ucw.cz>
> ---
> compat/mingw.h | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/compat/mingw.h b/compat/mingw.h
> index 15f0c9d..8745d19 100644
> --- a/compat/mingw.h
> +++ b/compat/mingw.h
> @@ -369,10 +369,11 @@ extern CRITICAL_SECTION pinfo_cs;
> void mingw_startup();
> #define main(c,v) dummy_decl_mingw_main(); \
> static int mingw_main(c,v); \
> -int main(int argc, char **argv) \
> +int main(c, char **main_argv_not_used) \
> { \
> + typedef v, **argv_type; \
> mingw_startup(); \
> - return mingw_main(__argc, __argv); \
> + return mingw_main(__argc, (argv_type)__argv); \
> } \
> static int mingw_main(c,v)
>
I have to admit I had trouble understanding what 'typedef v, **arv_type;' does (looks invalid at first glance), and why you would need main_argv_not_used instead of just main(c,v).
So, I'd like to award +10 points for cleverness, but -10 for obscurity ;-) Probably deserves a comment or an explanation in the commit message.
A simpler solution that works with all definitions of main() is to cast to void* (tell the compiler all responsibility is on us). I.e.:
void mingw_startup();
#define main(c,v) dummy_decl_mingw_main(); \
static int mingw_main(c,v); \
int main(c,v) \
{ \
mingw_startup(); \
return mingw_main(__argc, (void *) __argv); \
} \
static int mingw_main(c,v)
--
--
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 2/2] mingw: avoid const warning
2014-06-06 15:08 ` Karsten Blees
@ 2014-06-06 19:13 ` Junio C Hamano
2014-06-06 21:15 ` Karsten Blees
0 siblings, 1 reply; 9+ messages in thread
From: Junio C Hamano @ 2014-06-06 19:13 UTC (permalink / raw
To: Karsten Blees; +Cc: Stepan Kasal, GIT Mailing-list, Erik Faye-Lund, msysgit
Karsten Blees <karsten.blees@gmail.com> writes:
> Am 29.05.2014 12:47, schrieb Stepan Kasal:
>> Fix const warnings in http-fetch.c and remote-curl.c main() where is
>> argv declared as const.
>>
>> The fix should work for all future declarations of main, no matter
>> whether the second parameter's type is "char**", "const char**", or
>> "char *[]".
>
> I'm 100% in favor of a solution that doesn't restrict main to non-const char**! Thanks.
>
>> Signed-off-by: Stepan Kasal <kasal@ucw.cz>
>> ---
>> compat/mingw.h | 5 +++--
>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/compat/mingw.h b/compat/mingw.h
>> index 15f0c9d..8745d19 100644
>> --- a/compat/mingw.h
>> +++ b/compat/mingw.h
>> @@ -369,10 +369,11 @@ extern CRITICAL_SECTION pinfo_cs;
>> void mingw_startup();
>> #define main(c,v) dummy_decl_mingw_main(); \
>> static int mingw_main(c,v); \
>> -int main(int argc, char **argv) \
>> +int main(c, char **main_argv_not_used) \
>> { \
>> + typedef v, **argv_type; \
>> mingw_startup(); \
>> - return mingw_main(__argc, __argv); \
>> + return mingw_main(__argc, (argv_type)__argv); \
>> } \
>> static int mingw_main(c,v)
>>
>
> I have to admit I had trouble understanding what 'typedef v,
> **arv_type;' does (looks invalid at first glance), and why you
> would need main_argv_not_used instead of just main(c,v).
>
> So, I'd like to award +10 points for cleverness, but -10 for
> obscurity ;-) Probably deserves a comment or an explanation in the
> commit message.
Agreed. The "typedef" one is a cute hack.
I am wondering why the solution is not a more obvious "drop const
that is not ANSI C", though. I only have a ready-access to N1570
draft but in it I find:
5.1.2.2.1 Program startup
The function called at program startup is named main. The
implementation declares no prototype for this function. It shall
be defined with a return type of int and with no parameters:
int main(void) { /* ... */ }
or with two parameters (referred to here as argc and argv,
though any names may be used, as they are local to the function
in which they are declared):
int main(int argc, char *argv[]) { /* ... */ }
or equivalent;10) or in some other implementation-defined manner.
---
10) Thus, int can be replaced by a typedef name defined as int,
or the type of argv can be written as char ** argv, and so on.
> A simpler solution that works with all definitions of main() is to
> cast to void* (tell the compiler all responsibility is on
> us).
Can you cast away the constness that way, though?
--
--
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 2/2] mingw: avoid const warning
2014-06-06 19:13 ` Junio C Hamano
@ 2014-06-06 21:15 ` Karsten Blees
2014-06-07 6:46 ` [PATCH v2 0/2] mingw: macro main(), const warnings Stepan Kasal
0 siblings, 1 reply; 9+ messages in thread
From: Karsten Blees @ 2014-06-06 21:15 UTC (permalink / raw
To: Junio C Hamano; +Cc: Stepan Kasal, GIT Mailing-list, Erik Faye-Lund, msysgit
Am 06.06.2014 21:13, schrieb Junio C Hamano:
> Karsten Blees <karsten.blees@gmail.com> writes:
>
>> Am 29.05.2014 12:47, schrieb Stepan Kasal:
>>> Fix const warnings in http-fetch.c and remote-curl.c main() where is
>>> argv declared as const.
>>>
>>> The fix should work for all future declarations of main, no matter
>>> whether the second parameter's type is "char**", "const char**", or
>>> "char *[]".
>>
>> I'm 100% in favor of a solution that doesn't restrict main to non-const char**! Thanks.
>>
>>> Signed-off-by: Stepan Kasal <kasal@ucw.cz>
>>> ---
>>> compat/mingw.h | 5 +++--
>>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/compat/mingw.h b/compat/mingw.h
>>> index 15f0c9d..8745d19 100644
>>> --- a/compat/mingw.h
>>> +++ b/compat/mingw.h
>>> @@ -369,10 +369,11 @@ extern CRITICAL_SECTION pinfo_cs;
>>> void mingw_startup();
>>> #define main(c,v) dummy_decl_mingw_main(); \
>>> static int mingw_main(c,v); \
>>> -int main(int argc, char **argv) \
>>> +int main(c, char **main_argv_not_used) \
>>> { \
>>> + typedef v, **argv_type; \
>>> mingw_startup(); \
>>> - return mingw_main(__argc, __argv); \
>>> + return mingw_main(__argc, (argv_type)__argv); \
>>> } \
>>> static int mingw_main(c,v)
>>>
>>
>> I have to admit I had trouble understanding what 'typedef v,
>> **arv_type;' does (looks invalid at first glance), and why you
>> would need main_argv_not_used instead of just main(c,v).
>>
>> So, I'd like to award +10 points for cleverness, but -10 for
>> obscurity ;-) Probably deserves a comment or an explanation in the
>> commit message.
>
> Agreed. The "typedef" one is a cute hack.
>
> I am wondering why the solution is not a more obvious "drop const
> that is not ANSI C", though. I only have a ready-access to N1570
> draft but in it I find:
>
Actually, that was the original solution ($gmane/247535). I just complained because it was slightly different from what we had in msysgit for quite some time [1], causing merge conflicts.
I guess compilers probably won't complain if you declare argv const, even if the standard is more strict. After all, you aren't supposed to modify argv.
>
>> A simpler solution that works with all definitions of main() is to
>> cast to void* (tell the compiler all responsibility is on
>> us).
>
> Can you cast away the constness that way, though?
>
Not 'away'. This passes a non-const value to a const parameter, which is typically not a problem. Its just 'char**' to 'const char**' that produces the warning, because 'const char' hides behind a non-const pointer, see [2]. 'void*' to 'const char**' works, though.
[1] https://github.com/msysgit/git/commit/6949537a
[2] http://c-faq.com/ansi/constmismatch.html
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v2 0/2] mingw: macro main(), const warnings
2014-06-06 21:15 ` Karsten Blees
@ 2014-06-07 6:46 ` Stepan Kasal
2014-06-07 6:46 ` [PATCH v2 1/2] Win32: move main macro to a function Stepan Kasal
2014-06-07 6:46 ` [PATCH v2 2/2] mingw: avoid const warning Stepan Kasal
0 siblings, 2 replies; 9+ messages in thread
From: Stepan Kasal @ 2014-06-07 6:46 UTC (permalink / raw
To: GIT Mailing-list; +Cc: msysGit, Stepan Kasal
Hi,
On Fri, Jun 06, 2014 at 11:15:04PM +0200, Karsten Blees wrote:
> Am 06.06.2014 21:13, schrieb Junio C Hamano:
> > I am wondering why the solution is not a more obvious "drop const
> > that is not ANSI C", though. I only have a ready-access to N1570
> > draft but in it I find:
> >
>
> Actually, that was the original solution ($gmane/247535).
> > Karsten Blees <karsten.blees@gmail.com> writes:
> >> A simpler solution that works with all definitions of main() is to
> >> cast to void* (tell the compiler all responsibility is on
> >> us).
Indeed, verified. Re-submitting.
Cheers,
Stepan
Karsten Blees (1):
Win32: move main macro to a function
Stepan Kasal (1):
mingw: avoid const warning
compat/mingw.c | 15 +++++++++++++++
compat/mingw.h | 14 ++++----------
2 files changed, 19 insertions(+), 10 deletions(-)
--
2.0.0.9635.g0be03cb
--
--
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^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v2 1/2] Win32: move main macro to a function
2014-06-07 6:46 ` [PATCH v2 0/2] mingw: macro main(), const warnings Stepan Kasal
@ 2014-06-07 6:46 ` Stepan Kasal
2014-06-07 6:46 ` [PATCH v2 2/2] mingw: avoid const warning Stepan Kasal
1 sibling, 0 replies; 9+ messages in thread
From: Stepan Kasal @ 2014-06-07 6:46 UTC (permalink / raw
To: GIT Mailing-list; +Cc: msysGit, Karsten Blees, Erik Faye-Lund, Stepan Kasal
From: Karsten Blees <blees@dcon.de>
Date: Fri, 7 Jan 2011 19:47:23 +0100
The code in the MinGW main macro is getting more and more complex, move to
a separate initialization function for readabiliy and extensibility.
Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
---
compat/mingw.c | 15 +++++++++++++++
compat/mingw.h | 14 ++++----------
2 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/compat/mingw.c b/compat/mingw.c
index a0e13bc..c03bafa 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1847,3 +1847,18 @@ int mingw_offset_1st_component(const char *path)
return offset + is_dir_sep(path[offset]);
}
+
+void mingw_startup()
+{
+ /* copy executable name to argv[0] */
+ __argv[0] = xstrdup(_pgmptr);
+
+ /* initialize critical section for waitpid pinfo_t list */
+ InitializeCriticalSection(&pinfo_cs);
+
+ /* set up default file mode and file modes for stdin/out/err */
+ _fmode = _O_BINARY;
+ _setmode(_fileno(stdin), _O_BINARY);
+ _setmode(_fileno(stdout), _O_BINARY);
+ _setmode(_fileno(stderr), _O_BINARY);
+}
diff --git a/compat/mingw.h b/compat/mingw.h
index 3eaf822..15f0c9d 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -363,22 +363,16 @@ void free_environ(char **env);
extern CRITICAL_SECTION pinfo_cs;
/*
- * A replacement of main() that ensures that argv[0] has a path
- * and that default fmode and std(in|out|err) are in binary mode
+ * A replacement of main() that adds win32 specific initialization.
*/
+void mingw_startup();
#define main(c,v) dummy_decl_mingw_main(); \
static int mingw_main(c,v); \
int main(int argc, char **argv) \
{ \
- extern CRITICAL_SECTION pinfo_cs; \
- _fmode = _O_BINARY; \
- _setmode(_fileno(stdin), _O_BINARY); \
- _setmode(_fileno(stdout), _O_BINARY); \
- _setmode(_fileno(stderr), _O_BINARY); \
- argv[0] = xstrdup(_pgmptr); \
- InitializeCriticalSection(&pinfo_cs); \
- return mingw_main(argc, argv); \
+ mingw_startup(); \
+ return mingw_main(__argc, __argv); \
} \
static int mingw_main(c,v)
--
2.0.0.9635.g0be03cb
--
--
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^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v2 2/2] mingw: avoid const warning
2014-06-07 6:46 ` [PATCH v2 0/2] mingw: macro main(), const warnings Stepan Kasal
2014-06-07 6:46 ` [PATCH v2 1/2] Win32: move main macro to a function Stepan Kasal
@ 2014-06-07 6:46 ` Stepan Kasal
1 sibling, 0 replies; 9+ messages in thread
From: Stepan Kasal @ 2014-06-07 6:46 UTC (permalink / raw
To: GIT Mailing-list; +Cc: msysGit, Stepan Kasal
Fix const warnings in http-fetch.c and remote-curl.c main() where is
argv declared as const.
The fix should work for all future declarations of main, no matter
whether the second parameter's type is "char**", "const char**", or
"char *[]".
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
---
compat/mingw.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/compat/mingw.h b/compat/mingw.h
index 15f0c9d..6dc8b1a 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -372,7 +372,7 @@ static int mingw_main(c,v); \
int main(int argc, char **argv) \
{ \
mingw_startup(); \
- return mingw_main(__argc, __argv); \
+ return mingw_main(__argc, (void *)__argv); \
} \
static int mingw_main(c,v)
--
2.0.0.9635.g0be03cb
--
--
*** Please reply-to-all at all times ***
*** (do not pretend to know who is subscribed and who is not) ***
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^ permalink raw reply related [flat|nested] 9+ messages in thread
end of thread, other threads:[~2014-06-07 6:46 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-05-29 10:43 [PATCH 0/2] mingw: macro main(), const warnings Stepan Kasal
2014-05-29 10:45 ` [PATCH 1/2] Win32: move main macro to a function Stepan Kasal
2014-05-29 10:47 ` [PATCH 2/2] mingw: avoid const warning Stepan Kasal
2014-06-06 15:08 ` Karsten Blees
2014-06-06 19:13 ` Junio C Hamano
2014-06-06 21:15 ` Karsten Blees
2014-06-07 6:46 ` [PATCH v2 0/2] mingw: macro main(), const warnings Stepan Kasal
2014-06-07 6:46 ` [PATCH v2 1/2] Win32: move main macro to a function Stepan Kasal
2014-06-07 6:46 ` [PATCH v2 2/2] mingw: avoid const warning Stepan Kasal
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