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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.
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