Commits on Jun 23, 2020

1. Always use builtin alloca() …

   Fixes the build on NetBSD 9 on arm64.
   
   GCC expands alloca() to __builtin_alloca() but only in nonstandard mode,
   e.g. when -std=... is not supplied.  In standards mode (with -std=...)
   alloca() is left undefined by GCC. The C library may define it but it
   also may not, as on NetBSD on arm64:
   
       $ uname -srp
       NetBSD 9.0 aarch64
   
       $ cat alloca.c
       #include <stdlib.h>
       int main() { char *p = alloca(10); }
   
       $ gcc alloca.c
   
       $ gcc -std=c99 alloca.c
       alloca.c:(.text+0xc): warning: Warning: reference to the libc
        supplied alloca(3); this most likely will not work. Please use the
        compiler provided version of alloca(3), by supplying the
        appropriate compiler flags (e.g. not -std=c89).
       ld: alloca.c:(.text+0xc): undefined reference to `alloca'
   
   The fix is to either not use standards mode (undesirable) or to
   explicitly use the builtin, which is what this patch does.
   
   This is also sufficient for Solarius/Illumos so that check and include
   are removed.

   

   sjmulder committed Jun 23, 2020
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