Re: Re: popen and pclose redefinitions causing many warning in Windows build

On Fri, May 23, 2014 at 10:43 PM, Alvaro Herrera
<alvherre@2ndquadrant.com> wrote:
> x86_64-w64-mingw32-gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-Wmissing-format-attribute-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g
-I../../../../src/include-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/include
-I../pgsql/src/include/port/win32-DEXEC_BACKEND -I/c/prog/3p64/include/libxml2  -I/c/prog/3p64/include
-I/c/prog/3p64/openssl/include"-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/include/port/win32" -DBUILDING_DLL
-c -o mingwcompat.o /home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/backend/port/win32/mingwcompat.c 
> c:/mingw/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/backend/port/win32/mingwcompat.c:60:1: warning:
'RegisterWaitForSingleObject'redeclared without dllimport attribute: previous dllimport ignored [-Wattributes] 
>  RegisterWaitForSingleObject(PHANDLE phNewWaitObject,
>  ^
This one is also an old warning, looking at the buildfarm it is
present as well in REL9_2_STABLE... In mingw-w64
RegisterWaitForSingleObject is already defined in winbase.h here:
http://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-headers/include/winbase.h
What do you think about adding a #ifndef _WINBASE_ block that includes
LoadKernel32 and RegisterWaitForSingleObject in mingwcompat.c?

> x86_64-w64-mingw32-gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-Wmissing-format-attribute-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g
-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/interfaces/libpq-I../../../src/include
-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/include-I../pgsql/src/include/port/win32 -DEXEC_BACKEND
-I/c/prog/3p64/include/libxml2 -I/c/prog/3p64/include -I/c/prog/3p64/openssl/include
"-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/include/port/win32" -c -o parallel.o
/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/bin/pg_dump/parallel.c
> c:/mingw/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/bin/pg_dump/parallel.c: In function 'pgpipe':
> c:/mingw/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/bin/pg_dump/parallel.c:1332:2: warning: overflow
inimplicit constant conversion [-Woverflow] 
>   handles[0] = handles[1] = INVALID_SOCKET;
>   ^
> c:/mingw/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/bin/pg_dump/parallel.c:1386:3: warning: overflow
inimplicit constant conversion [-Woverflow] 
>    handles[1] = INVALID_SOCKET;
>    ^
In mingw-w64, SOCKET_INVALID is defined as ~0:
http://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-headers/include/psdk_inc/_socket_types.h
Is this overflow caused because SOCKET_INVALID corresponds to a 64b
value in mingw-w64?
Looking at the code this exists since 9.3.

> x86_64-w64-mingw32-gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-Wmissing-format-attribute-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g  -I.
-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/contrib/pg_stat_statements-I../../src/include
-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/include-I../pgsql/src/include/port/win32 -DEXEC_BACKEND
-I/c/prog/3p64/include/libxml2 -I/c/prog/3p64/include -I/c/prog/3p64/openssl/include
"-I/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/src/include/port/win32" -c -o pg_stat_statements.o
/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/contrib/pg_stat_statements/pg_stat_statements.c
> c:/mingw/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/contrib/pg_stat_statements/pg_stat_statements.c: In
function'pgss_ProcessUtility': 
>
c:/mingw/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/contrib/pg_stat_statements/pg_stat_statements.c:998:4:
warning:unknown conversion type character 'l' in format [-Wformat=] 
>     sscanf(completionTag, "COPY " UINT64_FORMAT, &rows) != 1)
>     ^
>
c:/mingw/msys/1.0/home/pgrunner/bf/root/HEAD/pgsql.5100/../pgsql/contrib/pg_stat_statements/pg_stat_statements.c:998:4:
warning:too many arguments for format [-Wformat-extra-args] 
Hm... After a little bit of googling, I found that:
http://sourceforge.net/p/mingw/bugs/1315/
This seems to be part of the standard of Microsoft, making sscanf not
accept ISO-C99 format specifiers. Looking more into the code, this is
a pretty old warning introduced by a5495cd of 2009. This code is btw
correct as the number of rows returned by a COPY is uint64. Any idea
what would be doable here?

Regards,
--
Michael