I was following along the build instructions for VS in section 4.2 at
http://www.libav.org/platform.html.
Visual Studio 2015 must have changed stdio.h somehow. I see the macro
redefinition in the make lines, and somehow stdio.h doesn't like it.
Is there a work around?
This is the build message:
$ make V=1
cl -nologo -I. -I. -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -D_WIN32_WINNT=0x0502 -Dstrtod=avpriv_strtod
-Dsnprintf=avpriv_snprintf -D_snprintf=avpriv_snprintf
-Dvsnprintf=avpriv_vsnprintf -DHAVE_AV_CONFIG_H -I. -I. -D_ISOC99_SOURCE
-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_WIN32_WINNT=0x0502
-Dstrtod=avpriv_strtod -Dsnprintf=avpriv_snprintf
-D_snprintf=avpriv_snprintf -Dvsnprintf=avpriv_vsnprintf -DHAVE_AV_CONFIG_H
-nologo -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -Dinline=__inline
-FIstdlib.h -Dstrtoll=_strtoi64 -Z7 -W4 -wd4244 -wd4127 -wd4018 -wd4389
-wd4146 -wd4057 -wd4204 -wd4706 -wd4305 -wd4152 -wd4324 -we4013 -wd4100
-wd4214 -wd4273 -wd4554 -wd4701 -O2 -Oy- -showIncludes -Zs
libavdevice/alldevices.c 2>&1 | awk '/including/ { sub(/^.*file: */, "");
gsub(/\\/, "/"); if (!match($0, / /)) print "libavdevice/alldevices.o:", $0
}' > libavdevice/alldevices.d
cl -I. -I. -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-D_WIN32_WINNT=0x0502 -Dstrtod=avpriv_strtod -Dsnprintf=avpriv_snprintf
-D_snprintf=avpriv_snprintf -Dvsnprintf=avpriv_vsnprintf -DHAVE_AV_CONFIG_H
-nologo -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -Dinline=__inline
-FIstdlib.h -Dstrtoll=_strtoi64 -Z7 -W4 -wd4244 -wd4127 -wd4018 -wd4389
-wd4146 -wd4057 -wd4204 -wd4706 -wd4305 -wd4152 -wd4324 -we4013 -wd4100
-wd4214 -wd4273 -wd4554 -wd4701 -O2 -Oy- -c -Folibavdevice/alldevices.o
libavdevice/alldevices.c
alldevices.c
C:\Program Files (x86)\Windows
Kits\10\include\10.0.10056.0\ucrt\stdio.h(1419): warning C4005: 'vsnprintf':
macro redefinition
C:\Program Files (x86)\Windows
Kits\10\include\10.0.10056.0\ucrt\stdio.h(1419): note: command-line
arguments: see previous definition of 'vsnprintf'
C:\Program Files (x86)\Windows
Kits\10\include\10.0.10056.0\ucrt\stdio.h(1421): fatal error C1189: #error:
Macro definition of vsnprintf conflicts with Standard Library function
declaration
Makefile:44: recipe for target 'libavdevice/alldevices.o' failed
make: *** [libavdevice/alldevices.o] Error 2
These are the relevant lines in stdio.h:
#if defined vsnprintf
// This definition of vsnprintf will generate "warning C4005:
'vsnprintf': macro
// redefinition" with a subsequent line indicating where the previous
definition
// of vsnprintf was. This makes it easier to find where vsnprintf was
defined.
#pragma warning(push, 1)
#pragma warning(1: 4005)
#define vsnprintf Do not define vsnprintf as a macro
#pragma warning(pop)
#error Macro definition of vsnprintf conflicts with Standard Library
function declaration
#endif
_Success_(return >= 0)
_Check_return_opt_
_CRT_STDIO_INLINE int __CRTDECL vsnprintf(
_Out_writes_(_BufferCount) char* const _Buffer,
_In_ size_t const _BufferCount,
_In_z_ _Printf_format_string_ char const* const _Format,
va_list _ArgList
)
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