Compilation with mingw gcc (4.2.0) on Windows XP gives following
errors at salsa.cpp compilation step.
g++ -DNDEBUG -g -O2 -msse2 -pipe -c salsa.cpp
In file included from c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/
include/xmmintrin.h:42,
from c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/
include/emmintrin.h:34,
from salsa.cpp:10:
c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/include/mm_malloc.h: In
function 'void* __mingw_aligned_malloc(size_t, size_t)':
c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/include/mm_malloc.h:34:
error: 'void* __mingw_aligned_malloc(size_t, size_t)' was declared
'extern' and later 'static'
c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/../../../../include/
malloc.h:88: error: previous declaration of 'void*
__mingw_aligned_malloc(size_t, size_t)'
c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/include/mm_malloc.h: In
function 'void __mingw_aligned_free(void*)':
c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/include/mm_malloc.h:71:
error: 'void __mingw_aligned_free(void*)' was declared 'extern' and
later 'static'
c:/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.0/../../../../include/
malloc.h:90: error: previous declaration of 'void
__mingw_aligned_free(void*)'
The error occurs in all versions of gcc 3.4 - 4.2
The error occurs because in config.h (line 303) _mm_alloc is linked to
_mingw_aligned_malloc
#elif defined(__MINGW32__)
#ifndef _mm_malloc
#define _mm_malloc(a, b) __mingw_aligned_malloc(a, b)
#define _mm_free(a) __mingw_aligned_free(a)
#endif
#define CRYPTOPP_MM_MALLOC_AVAILABLE
while in salsa.cpp (line 9) including emmintrin.h results in a error
since _mm_alloc is defined in mm_alloc.h as local function.
#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
#include <emmintrin.h>
#endif
This quick and dirty fix in salsa.cpp solved the problem
#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+ #if defined(__MINGW32__)
+ #ifdef _mm_malloc
+ #undef _mm_malloc
+ #undef _mm_free
+ #endif
+ #endif
#include <emmintrin.h>
#endif
another possible fix could be in config.h
#if !defined(CRYPTOPP_DISABLE_SSE2) &&
(defined(CRYPTOPP_MSVC6PP_OR_LATER) || defined(__SSE2__))
#define CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE 1
+ #if defined(__MINGW32__)
+ #include <emmintrin.h>
+ #endif
#else
#define CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE 0
#endif
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