On Wed, 27 Nov 2024, Pali Rohár wrote:
In Visual Studio when including crtdbg.h file with both _DEBUG and
_CRTDBG_MAP_ALLOC macros set, all standard memory allocation functions are
redefined and forwarded to their *_dbg siblings. This allows to track
memory allocation in program compiled and linked with debug version of CRT
DLL library.
Add same support also into mingw-w64. This allows to use memory leak
functionality provided by msvcrtd.dll when compiling with gcc's
-mcrtdll=msvcrtd and -D_DEBUG and -D_CRTDBG_MAP_ALLOC switches.
Note that those redefined functions needs macro guards in other header
files to prevent expadning redefined macros when declaring non-debug
functions. For example when declaring void *__cdecl malloc(size_t _Size);
in malloc.h header file, it needs to be ensured that malloc macro from
crtdbg.h #define malloc(s) _malloc_dbg(s,_NORMAL_BLOCK,__FILE__,__LINE__)
does not expad for standard malloc declaration. Same guard technique via
pragma push_macro, undef and pragma pop_macro is used by Visual Studio.
---
mingw-w64-headers/crt/corecrt_wstdlib.h | 10 +++-
mingw-w64-headers/crt/crtdbg.h | 44 ++++++++++++++++
mingw-w64-headers/crt/direct.h | 33 ++++++++++++
mingw-w64-headers/crt/io.h | 15 ++++++
mingw-w64-headers/crt/malloc.h | 67 ++++++++++++++++++++++++
mingw-w64-headers/crt/mbstring.h | 7 +++
mingw-w64-headers/crt/sec_api/stdlib_s.h | 10 +++-
mingw-w64-headers/crt/stdio.h | 21 ++++++++
mingw-w64-headers/crt/stdlib.h | 63 ++++++++++++++++++++++
mingw-w64-headers/crt/string.h | 28 ++++++++++
mingw-w64-headers/crt/wchar.h | 42 +++++++++++++++
11 files changed, 338 insertions(+), 2 deletions(-)
This patch also seems ok to me.
On first look, this feels like it adds a lot of noise to the headers, but
I guess it's not all that bad. So I can push it if nobody else objects to
it.
// Martin
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