Adding upstream version 1.21.4.upstream/1.21.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/lib/alloca.in.h b/lib/alloca.in.h
new file mode 100644
index 0000000..a1bb3d7
--- /dev/null
+++ b/lib/alloca.in.h
@@ -0,0 +1,72 @@
+/* Memory allocation on the stack.
+
+   Copyright (C) 1995, 1999, 2001-2004, 2006-2023 Free Software Foundation,
+   Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
+   means there is a real alloca function.  */
+#ifndef _GL_ALLOCA_H
+#define _GL_ALLOCA_H
+
+/* alloca (N) returns a pointer to N bytes of memory
+   allocated on the stack, which will last until the function returns.
+   Use of alloca should be avoided:
+     - inside arguments of function calls - undefined behaviour,
+     - in inline functions - the allocation may actually last until the
+       calling function returns,
+     - for huge N (say, N >= 65536) - you never know how large (or small)
+       the stack is, and when the stack cannot fulfill the memory allocation
+       request, the program just crashes.
+ */
+
+#ifndef alloca
+  /* Some version of mingw have an <alloca.h> that causes trouble when
+     included after 'alloca' gets defined as a macro.  As a workaround,
+     include this <alloca.h> first and define 'alloca' as a macro afterwards
+     if needed.  */
+# if defined __GNUC__ && (defined _WIN32 && ! defined __CYGWIN__) && @HAVE_ALLOCA_H@
+#  include_next <alloca.h>
+# endif
+#endif
+#ifndef alloca
+# if defined __GNUC__ || (__clang_major__ >= 4)
+#  define alloca __builtin_alloca
+# elif defined _AIX
+#  define alloca __alloca
+# elif defined _MSC_VER
+#  include <malloc.h>
+#  define alloca _alloca
+# elif defined __DECC && defined __VMS
+#  define alloca __ALLOCA
+# elif defined __TANDEM && defined _TNS_E_TARGET
+#  ifdef  __cplusplus
+extern "C"
+#  endif
+void *_alloca (unsigned short);
+#  pragma intrinsic (_alloca)
+#  define alloca _alloca
+# elif defined __MVS__
+#  include <stdlib.h>
+# else
+#  include <stddef.h>
+#  ifdef  __cplusplus
+extern "C"
+#  endif
+void *alloca (size_t);
+# endif
+#endif
+
+#endif /* _GL_ALLOCA_H */