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-/* vla.h - variable length arrays
-
- Copyright 2014-2023 Free Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <https://www.gnu.org/licenses/>.
-
- Written by Paul Eggert. */
-
-/* The VLA_ELEMS macro does not allocate variable-length arrays (VLAs),
- so it does not have the security or performance issues commonly
- associated with VLAs. VLA_ELEMS is for exploiting a C11 feature
- where a function can start like this:
-
- double scan_array (int n, double v[static n])
-
- to require a caller to pass a vector V with at least N elements;
- this allows better static checking and performance in some cases.
- In C11 this feature means that V is a VLA, so the feature is
- supported only if __STDC_NO_VLA__ is defined, and for compatibility
- to platforms that do not support VLAs, VLA_ELEMS (n) expands to
- nothing when __STDC_NO_VLA__ is not defined. */
-
-/* A function's argument must point to an array with at least N elements.
- Example: 'int main (int argc, char *argv[VLA_ELEMS (argc)]);'. */
-
-#ifdef __STDC_NO_VLA__
-# define VLA_ELEMS(n)
-#else
-# define VLA_ELEMS(n) static n
-#endif
-
-/* Although C99 requires support for variable-length arrays (VLAs),
- some C compilers never supported VLAs and VLAs are optional in C11.
- VLAs are controversial because their allocation may be unintended
- or awkward to support, and large VLAs might cause security or
- performance problems. GCC can diagnose the use of VLAs via the
- -Wvla and -Wvla-larger-than warnings options, and defining the
- macro GNULIB_NO_VLA disables the allocation of VLAs in Gnulib code.
-
- The VLA_ELEMS macro is unaffected by GNULIB_NO_VLA, since it does
- not allocate VLAs. Programs that use VLA_ELEMS should be compiled
- with 'gcc -Wvla-larger-than' instead of with 'gcc -Wvla'. */