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Today's Topics:
1. [mingw] #40317: Install error (MinGW Notification List)
2. [mingw] #40315: c++17 std::aligned_alloc (MinGW Notification List)
----------------------------------------------------------------------
Message: 1
Date: Sun, 12 Apr 2020 17:48:23 +0900
From: MinGW Notification List <[email protected]>
To: OSDN Ticket System <[email protected]>
Subject: [MinGW-Notify] [mingw] #40317: Install error
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
#40317: Install error
Open Date: 2020-04-11 17:31
Last Update: 2020-04-12 17:48
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/40317
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=40317
---------------------------------------------------------------------
Last Changes/Comment on this Ticket:
2020-04-12 17:48 Updated by: okolo
Comment:
Hello. Absolutely nothing is downloaded from the MSYS kit.
Besides gdb-7.6.1-1-mingw32-bin.tar.lzma for yesterday I needed the
make-3.82.90-2-mingw32-cvs-20120902-bin.tar.lzma
---------------------------------------------------------------------
Ticket Status:
Reporter: okolo
Owner: (None)
Type: Issues
Status: Open
Priority: 1 - Lowest
MileStone: (None)
Component: INSTALLER
Severity: 1 - Lowest
Resolution: Invalid
---------------------------------------------------------------------
Ticket details:
Hello. I get an error while trying to install. The error can be seen in the
attached screenshot. https://s8.hostingkartinok.com/uploads/images/2020/04/
62a8767b18fb14095e5af632bd09b3dd.jpg
--
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/40317
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=40317
------------------------------
Message: 2
Date: Sun, 12 Apr 2020 23:24:12 +0100
From: MinGW Notification List <[email protected]>
To: OSDN Ticket System <[email protected]>
Subject: [MinGW-Notify] [mingw] #40315: c++17 std::aligned_alloc
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
#40315: c++17 std::aligned_alloc
Open Date: 2020-04-10 05:55
Last Update: 2020-04-12 23:24
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/40315
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=40315
---------------------------------------------------------------------
Last Changes/Comment on this Ticket:
2020-04-12 23:24 Updated by: keith
Comment:
Reply To drakbar
I am not sure if this helps, but it seems that GCC version 7.4 implemented
this.
Indeed, it did. For -std=c++17, in <cstdlib> it looks like this:
1. #if __cplusplus >= 201703L && defined(_GLIBCXX_HAVE_ALIGNED_ALLOC)
2. using ::aligned_alloc;
3. #endif
The problem, when GCC is built for mingw32, is that there is no implementation
for ISO-C11's aligned_alloc(), so that _GLIBCXX_HAVE_ALIGNED_ALLOC macro is not
defined, and thus std::aligned_alloc() is not implemented in GCC for mingw32.
Of course, if ISO-C11's aligned_alloc() could be implemented, then C++17's
std::aligned_alloc() could also be supported; the problem, for aligned_alloc()
is that ISO-C11 requires it to allocate over-aligned memory which can
subsequently be freed by the standard free() function, or resized by the
realloc() function, and Microsoft's free() and realloc() are not compatible
with this requirement.
That said, I attached a proposed aligned_alloc() implementation to ticket #
38607, for which I invited peer review. To date, no one has bothered to respond
to that invitation, and without such review, I'm reluctant to push this into a
core MinGW library, (because it would require that Microsoft's realloc() and
free() implementations be overridden).
---------------------------------------------------------------------
Ticket Status:
Reporter: drakbar
Owner: (None)
Type: Issues
Status: Open
Priority: 5 - Medium
MileStone: (None)
Component: GCC
Severity: 5 - Medium
Resolution: None
---------------------------------------------------------------------
Ticket details:
According to cppreference, the function std::aligned_alloc is apart of C++17.
When trying to compile the example code found at that page, the following
compilation error occurs:
src code
1. #include <cstdio>
2. #include <cstdlib>
3.
4. int main()
5. {
6. int* p1 = static_cast<int*>(std::malloc(10*sizeof *p1));
7. std::printf("default-aligned address: %p\n", static_cast<void*>(p1));
8. std::free(p1);
9.
10. int* p2 = static_cast<int*>(std::aligned_alloc(1024, 1024));
11. std::printf("1024-byte aligned address: %p\n", static_cast<void*>(p2));
12. std::free(p2);
13. }
compilation output
$g++ -std=c++17 alignment.cpp -o main
alignment.cpp: In function 'int main()':
alignment.cpp:10:38: error: 'aligned_alloc' is not a member of 'std'
10 | int* p2 = static_cast<int*>(std::aligned_alloc(1024, 1024));
gcc version
Target: x86_64-w64-mingw32
Configured with: ../gcc-9.3.0/configure --prefix=/mingw64
--with-local-prefix=/mingw64/local --build=x86_64-w64-mingw32
--host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32
--with-native-system-header-dir=/mingw64/x86_64-w64-mingw32/include
--libexecdir=/mingw64/lib --enable-bootstrap --with-arch=x86-64
--with-tune=generic --enable-languages=c,lto,c++,fortran,ada,objc,obj-c++
--enable-shared --enable-static --enable-libatomic --enable-threads=posix
--enable-graphite --enable-fully-dynamic-string
--enable-libstdcxx-filesystem-ts=yes --enable-libstdcxx-time=yes
--disable-libstdcxx-pch --disable-libstdcxx-debug --disable-isl-version-check
--enable-lto --enable-libgomp --disable-multilib --enable-checking=release
--disable-rpath --disable-win32-registry --disable-nls --disable-werror
--disable-symvers --enable-plugin --with-libiconv --with-system-zlib
--with-gmp=/mingw64 --with-mpfr=/mingw64 --with-mpc=/mingw64
--with-isl=/mingw64 --with-pkgversion='Rev1, Built by MSYS2 project'
--with-bugurl=https://sourceforge.net/projects/msys2 --with-gnu-as --with-gnu-ld
Thread model: posix
gcc version 9.3.0 (Rev1, Built by MSYS2 project)
platform
Windows 10 Build: 18362.720
linker version
GNU ld (GNU Binutils) 2.34
mingw version
not quite sure which number is the relevant one in _mingw.h
??
build environment
I have tested using both windows command prompt and the msys-w64 shell, and
both yield the same result
MINGW64_NT-10.0-18362 3.0.7-338.x86_64 2019-07-11 10:58 UTC x86_64 Msys
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MinGW - Minimalist GNU for Windows Project is hosted on OSDN
Project URL: https://osdn.net/projects/mingw/
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URL for this Ticket:
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