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bug#24613: Windows build with rsvg fails on newest MinGW

From: Nikolay Kudryavtsev
Subject: bug#24613: Windows build with rsvg fails on newest MinGW
Date: Tue, 4 Oct 2016 15:12:07 +0300
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 
I've been trying to get rsvg working and here's what I found:

First, building xml.o fails:

  CC       xml.o
In file included from d:/Emacs/source/emacs-25.1/src/conf_post.h:32:0,
                 from ./config.h:1916,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:19:
d:/Emacs/source/emacs-25.1/nt/inc/ms-w32.h:149:0: warning: "_WIN32_WINNT" redefined 
 # define _WIN32_WINNT 0x0400
 ^
In file included from c:\mingw\include\w32api.h:59:0,
                 from c:\mingw\include\_mingw.h:73,
                 from d:/Emacs/source/emacs-25.1/nt/inc/mingw_time.h:13,
                 from d:/Emacs/source/emacs-25.1/nt/inc/ms-w32.h:27,
                 from d:/Emacs/source/emacs-25.1/src/conf_post.h:32,
                 from ./config.h:1916,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:19:
c:\mingw\include\sdkddkver.h:184:0: note: this is the location of the previous definition 
 #  define _WIN32_WINNT _WIN32_WINNT_WIN2K
 ^
In file included from c:\mingw\include\wchar.h:212:0,
                 from c:\mingw\include\iconv.h:106,
                 from C:/MinGW/include/libxml2/libxml/encoding.h:28,
                 from C:/MinGW/include/libxml2/libxml/parser.h:807,
                 from C:/MinGW/include/libxml2/libxml/globals.h:18,
                 from C:/MinGW/include/libxml2/libxml/threads.h:35,
                 from C:/MinGW/include/libxml2/libxml/xmlmemory.h:218,
                 from C:/MinGW/include/libxml2/libxml/tree.h:1248,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:23:
c:\mingw\include\sys/stat.h:173:8: error: redefinition of 'struct _stat'
 struct _stat __struct_stat_defined( _off_t, time_t );
        ^
In file included from d:/Emacs/source/emacs-25.1/nt/inc/ms-w32.h:440:0,
                 from d:/Emacs/source/emacs-25.1/src/conf_post.h:32,
                 from ./config.h:1916,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:19:
d:/Emacs/source/emacs-25.1/nt/inc/sys/stat.h:106:8: note: originally defined here 
 struct _stat
        ^
In file included from c:\mingw\include\wchar.h:212:0,
                 from c:\mingw\include\iconv.h:106,
                 from C:/MinGW/include/libxml2/libxml/encoding.h:28,
                 from C:/MinGW/include/libxml2/libxml/parser.h:807,
                 from C:/MinGW/include/libxml2/libxml/globals.h:18,
                 from C:/MinGW/include/libxml2/libxml/threads.h:35,
                 from C:/MinGW/include/libxml2/libxml/xmlmemory.h:218,
                 from C:/MinGW/include/libxml2/libxml/tree.h:1248,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:23:
c:\mingw\include\sys/stat.h:180:8: error: redefinition of 'struct stat'
 struct stat __struct_stat_defined( _off_t, time_t );
        ^
In file included from d:/Emacs/source/emacs-25.1/nt/inc/ms-w32.h:440:0,
                 from d:/Emacs/source/emacs-25.1/src/conf_post.h:32,
                 from ./config.h:1916,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:19:
d:/Emacs/source/emacs-25.1/nt/inc/sys/stat.h:89:8: note: originally defined here 
 struct stat {
        ^
In file included from c:\mingw\include\wchar.h:212:0,
                 from c:\mingw\include\iconv.h:106,
                 from C:/MinGW/include/libxml2/libxml/encoding.h:28,
                 from C:/MinGW/include/libxml2/libxml/parser.h:807,
                 from C:/MinGW/include/libxml2/libxml/globals.h:18,
                 from C:/MinGW/include/libxml2/libxml/threads.h:35,
                 from C:/MinGW/include/libxml2/libxml/xmlmemory.h:218,
                 from C:/MinGW/include/libxml2/libxml/tree.h:1248,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:23:
c:\mingw\include\sys/stat.h:188:8: error: redefinition of 'struct _stati64' 
 struct _stati64 __struct_stat_defined( __off64_t, time_t );
        ^
In file included from d:/Emacs/source/emacs-25.1/nt/inc/ms-w32.h:440:0,
                 from d:/Emacs/source/emacs-25.1/src/conf_post.h:32,
                 from ./config.h:1916,
                 from d:/Emacs/source/emacs-25.1/src/xml.c:19:
d:/Emacs/source/emacs-25.1/nt/inc/sys/stat.h:123:8: note: originally defined here 
 struct _stati64 {
        ^
In file included from d:/Emacs/source/emacs-25.1/src/xml.c:19:0:
./config.h:1836:19: error: two or more data types in declaration specifiers 
 #define mbstate_t int
                   ^
make[1]: *** [xml.o] Error 1
make[1]: Leaving directory `/d/Emacs/configs/25.1-MinGW-broken2/src'
make: *** [src] Error 2

This code only runs when mbstate_t check fails. Let's look at why it fails:

configure:18162: checking for mbstate_t
configure:18179: gcc -I /d/Emacs/source/emacs-25.1/nt/inc -c -O0 -g3 -mtune=pentium4 conftest.c >&5 
In file included from c:\mingw\include\wchar.h:212:0,
                 from conftest.c:133:
c:\mingw\include\sys/stat.h:173:8: error: redefinition of 'struct _stat'
 struct _stat __struct_stat_defined( _off_t, time_t );
        ^
In file included from conftest.c:105:0:
d:/Emacs/source/emacs-25.1/nt/inc/sys/stat.h:106:8: note: originally defined here 
 struct _stat
        ^
In file included from c:\mingw\include\wchar.h:212:0,
                 from conftest.c:133:
c:\mingw\include\sys/stat.h:180:8: error: redefinition of 'struct stat'
 struct stat __struct_stat_defined( _off_t, time_t );
        ^
In file included from conftest.c:105:0:
d:/Emacs/source/emacs-25.1/nt/inc/sys/stat.h:89:8: note: originally defined here 
 struct stat {
        ^
In file included from c:\mingw\include\wchar.h:212:0,
                 from conftest.c:133:
c:\mingw\include\sys/stat.h:188:8: error: redefinition of 'struct _stati64' 
 struct _stati64 __struct_stat_defined( __off64_t, time_t );
        ^
In file included from conftest.c:105:0:
d:/Emacs/source/emacs-25.1/nt/inc/sys/stat.h:123:8: note: originally defined here 
 struct _stati64 {
        ^
configure:18179: $? = 1
Since stat.h is in mingwrt, I decided to check whether older versions work. And sure, mingwrt-3.21.1 works fine. 

Then, there's a similar situation with glib:

make: *** [install-strip] Error 2
from d:/Emacs/MinGW/include/librsvg-2.0/librsvg/rsvg.h:31, 
                 from d:/Emacs/source/emacs-25.1/src/image.c:8997:
d:/Emacs/MinGW/include/glib-2.0/glib/gatomic.h:234:20: error: redefinition of 'MemoryBarrier' 
 static inline void MemoryBarrier (void)
                    ^
In file included from d:\emacs\mingw\include\windef.h:269:0,
                 from d:\emacs\mingw\include\windows.h:42,
                 from d:/Emacs/source/emacs-25.1/src/w32gui.h:21,
                 from d:/Emacs/source/emacs-25.1/src/dispextern.h:69,
                 from d:/Emacs/source/emacs-25.1/src/window.h:23,
                 from d:/Emacs/source/emacs-25.1/src/frame.h:23,
                 from d:/Emacs/source/emacs-25.1/src/image.c:36:
d:\emacs\mingw\include\winnt.h:4311:25: note: previous definition of 'MemoryBarrier' was here 
 static FORCEINLINE void MemoryBarrier (void)

Installing w32api-3.17-2-mingw32-dev.tar.lzma helped.

--
Best Regards,
Nikolay Kudryavtsev
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