crt: Change mingw-aligned-malloc.c to be compatible with MS CRT functions
MS CRT libraries (UCRT, msvcr70+ and os system msvcrt) for functions
_aligned_malloc() and _aligned_offset_malloc() allocate the source buffer
slightly smaller than the mingw-w64 functions in mingw-aligned-malloc.c.
This is because the alignment gap can be used for the user data too.
Do exactly same math calculation in the mingw-w64 implementation as is UCRT
doing. Same calculation is in msvcr70 and probably also in system msvcrt
library (at least different _msize() tests confirms it).
This will allow to call __mingw_aligned_msize() on buffer allocated by
MS CRT _aligned_malloc() function from msvcrt.dll, msvcr70.dll and
msvcrt71.dll CRT libraries. This is very useful because these CRT libraries
do not have _aligned_msize() function and hence mingw-w64 could emulate it
via __mingw_aligned_msize().
Signed-off-by: Martin Storsjö <martin@martin.st>
1 file changed
