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Today's Topics:
1. [mingw] #37995: Make alloca() API both GNU and Microsoft
compatible (MinGW Notification List)
2. [mingw] #38607: Improved standards support for aligned memory
allocators (MinGW Notification List)
----------------------------------------------------------------------
Message: 1
Date: Tue, 30 Oct 2018 11:19:48 +0000
From: MinGW Notification List <[email protected]>
To: OSDN Ticket System <[email protected]>
Subject: [MinGW-Notify] [mingw] #37995: Make alloca() API both GNU and
Microsoft compatible
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
#37995: Make alloca() API both GNU and Microsoft compatible
Open Date: 2018-03-03 16:12
Last Update: 2018-10-30 11:19
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/37995
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=37995
---------------------------------------------------------------------
Last Changes/Comment on this Ticket:
2018-10-30 11:19 Updated by: keith
* Status Update from Open to Closed
* Resolution Update from None to Accepted
Comment:
The changes required, to implement the <alloca.h> API, are now in the git
repository, and will be incorporated into the upcoming wsl-5.2 release.
The further suggested <malloc.h> changes relate, primarily, to improved
(legacy) support for Microsoft's _aligned_malloc() (and complementary) API;
this may be best addressed under ticket #38607.
---------------------------------------------------------------------
Ticket Status:
Reporter: keith
Owner: keith
Type: Feature Request
Status: Closed
Priority: 5 - Medium
MileStone: (None)
Component: WSL
Severity: 5 - Medium
Resolution: Accepted
---------------------------------------------------------------------
Ticket details:
As suggested in this mailing list discussion thread, (and this message in
particular), please consider adapting the existing alloca() implementation in
<malloc.h>, to make it equally accessible via a new <alloca.h> header, and so
offer added conformance with the corresponding GNU implementation.
In the process, please also update the existing <malloc.h> implementation of
other included APIs, to make them compatible with current Windows technologies.
--
Ticket information of MinGW - Minimalist GNU for Windows project
MinGW - Minimalist GNU for Windows Project is hosted on OSDN
Project URL: https://osdn.net/projects/mingw/
OSDN: https://osdn.net
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/37995
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=37995
------------------------------
Message: 2
Date: Tue, 30 Oct 2018 13:50:26 +0000
From: MinGW Notification List <[email protected]>
To: OSDN Ticket System <[email protected]>
Subject: [MinGW-Notify] [mingw] #38607: Improved standards support for
aligned memory allocators
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
#38607: Improved standards support for aligned memory allocators
Open Date: 2018-09-17 18:25
Last Update: 2018-10-30 13:50
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/38607
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=38607
---------------------------------------------------------------------
Last Changes/Comment on this Ticket:
2018-10-30 13:50 Updated by: keith
Comment:
I've attached a patch which reimplements the MinGW alternative to Microsoft's
_aligned_malloc() (and complementary) API, and also an accompanying test suite.
This corrects the deficiencies I've noted, in the previous MinGW
implementation; it also offers the following enhancements, (unlikely to be
supported by Microsoft's implementation), over the previous MinGW
implementation:–
• The __mingw_aligned_free() function is now able to distinguish pointers
returned by __mingw_aligned_malloc()}} (or {{{__mingw_aligned_offset_malloc
()) for other pointers; if the pointer argument cannot be identified as
referring to a __mingw_aligned_malloc() allocated block, it is passed
directly to free(), instead of freeing as an aligned heap block.
• A new public API entry, __mingw_maybe_aligned_realloc( void *, size_t ), is
provided; this offers the same discriminatory behaviour, w.r.t. its pointer
argument, as does the reimplementation of __mingw_aligned_free( void * ).
Unless there are significant objections, I propose incorporating this
alternative implementation of the __mingw_aligned_malloc() API, into the
wsl-5.2 release.
---------------------------------------------------------------------
Ticket Status:
Reporter: keith
Owner: (None)
Type: Feature Request
Status: Open
Priority: 5 - Medium
MileStone: (None)
Component: WSL
Severity: 5 - Medium
Resolution: None
---------------------------------------------------------------------
Ticket details:
Microsoft introduced _aligned_malloc(), and associated functions, with
MSVCR70.DLL. Although subsequently supported in MSVCRT.DLL, from WinXP onwards,
exposure of these APIs interferes with a clean build of GCC — not only insofar
as, having detected presence of the APIs, GCC would become dependent on WinXP
and later, thus needlessly breaking legacy support, but furthermore, the GCC
sources neglect to include the requisite <malloc.h> header file, and thus do
not build cleanly.
Legacy support for similar APIs was added to MinGW, in 2003/2004, under feature
request #260; however, it may be ill-advised to make GCC dependent on these
MinGW specific APIs, for the following reasons:—
1. A patch, to incorporate them, would be unlikely to be accepted upstream.
2. If the APIs are not detected, GCC will provide its own replacement
functions.
3. A review reveals potential flaws in the MinGW implementation.
Consequently, I suggest:—
1. **Not** exposing the Microsoft APIs in libmsvcrt.a
2. Reworking the MinGW implementation, to address potential flaws.
3. Consider adding support for ISO-C11's aligned_alloc() and POSIX.1's
posix_memalign() APIs.
--
Ticket information of MinGW - Minimalist GNU for Windows project
MinGW - Minimalist GNU for Windows Project is hosted on OSDN
Project URL: https://osdn.net/projects/mingw/
OSDN: https://osdn.net
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/38607
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=38607
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