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https://stackoverflow.com/questions/49373287/gcc-over-aligned-new-support-alignas
gcc over-aligned new support (alignas ) Ask Question Asked 1 year, 8 months ago. Active 1 year, 8 months ago. Viewed 4k times 9. 1. I'm having some difficulty finding more information about GCC's aligned-new warning and the gcc -faligned-new option. Compiling on gcc 7.2.0 (without --std=c++17) and trying to define an aligned struct such as:
http://gcc.gnu.org/projects/cxx-status.html
C++98 Support in GCC GCC has full support for the 1998 C++ standard as modified by the 2003 technical corrigendum and some later defect reports, excluding the export feature which was later removed from the language.. This mode is the default in GCC versions prior to 6.1; it can be explicitly selected with the -std=c++98 command-line flag, or -std=gnu++98 to enable GNU extensions as well.
http://en.cppreference.com/w/cpp/compiler_support
GCC (Updated 2020-01) C++11 core language support status (complete as of 4.8.1, except for n2670, which no compiler implements) C++14 core language support status (complete as of 5.1) C++17 core language support status (complete as of 7.1) C++20 core language support status; C++11 library support status (complete as of 5.1)
https://thenewcpp.wordpress.com/2012/11/02/alignment-support/
Nov 02, 2012 · GCC has recently implemented alignment support. In this post I will discuss what this is and how you can use it. There are four additions that are related to alignment support, these are the alignas alignment-specifier, the alignof expression, alignment arithmetic library support and std::align for aligning pointers. I will explain these all individually below.…
https://gcc.gnu.org/onlinedocs/gcc/Alignment.html
6.44 Determining the Alignment of Functions, Types or Variables. The keyword __alignof__ determines the alignment requirement of a function, object, or a type, or the minimum alignment usually required by a type. Its syntax is just like sizeof and C11 _Alignof.. For example, if the target machine requires a double value to be aligned on an 8-byte boundary, then __alignof__ (double) is 8.
http://www.gnu.org/software/gnulib/manual/html_node/stdalign_002eh.html
Recent versions of GCC support an extension in which the operand can also be a unary expression, as with sizeof. The Gnulib substitute does not support this extension. On most pre-C11 platforms, the operand of alignof / _Alignof cannot be a structure type containing a flexible array member.
https://en.cppreference.com/w/cpp/language/alignas
Explanation. The alignas specifier may be applied to the declaration of a variable or a non-bitfield class data member, or it can be applied to the declaration or definition of a class/struct/union or enumeration.It cannot be applied to a function parameter or to the exception parameter of a catch clause. The object or the type declared by such a declaration will have its alignment requirement ...
https://community.atmel.com/forum/c-alignas-keyword
Jul 14, 2017 · Should hopefully be a simple question. How would I go about finding out if the alignas is officially supported in the AS7 C++ compiler?
Since expand_stack_vars and such know how to deal with variables aligned beyond MAX_SUPPORTED_STACK_ALIGNMENT, we shouldn't reject alignas of large alignments. And if we don't do that, there's no point in having check_cxx_fundamental_alignment_constraints at all, since check_user_alignment already enforces MAX_OFILE_ALIGNMENT.
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf
supports that alignment in the context of the declaration, the alignment of the declared object shall be that alignment - if the constant expression evaluates to an extended alignment and the implementation does not support that alignment in the context of the declaration, the program is ill-formed )))
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