Fix for bug Bootstrap/58918.

+2013-10-30  Balaji V. Iyer  <balaji.v.iyer@intel.com>
+
+       * configure: Reconfigured.
+       * configure.ac: Add AC_FUNC_ALLOCA.
+       * runtime/sysdep-unix.c: Added check for alloca.h before
+       including it.
+       * config/x86/cilk-abi-vla.c: Likewise.
+       * runtime/cilk_fiber-unix.cpp: Likewise.
+

From-SVN: r204232

libcilkrts/ChangeLog

+2013-10-30  Balaji V. Iyer  <balaji.v.iyer@intel.com>
+
+	* configure: Reconfigured.
+	* configure.ac: Add AC_FUNC_ALLOCA.
+	* runtime/sysdep-unix.c: Added check for alloca.h before 
+	including it.
+	* config/x86/cilk-abi-vla.c: Likewise.
+	* runtime/cilk_fiber-unix.cpp: Likewise.
+
 2013-10-29  Tobias Burnus  <burnus@net-b.de>
 
 	* configure.ac: Add AM_MAINTAINER_MODE.

libcilkrts/Makefile.in

@@ -206,6 +206,7 @@ HEADERS = $(cilkinclude_HEADERS)
 ETAGS = etags
 CTAGS = ctags
 ACLOCAL = @ACLOCAL@
+ALLOCA = @ALLOCA@
 AMTAR = @AMTAR@
 AR = @AR@
 AUTOCONF = @AUTOCONF@

libcilkrts/configure.ac

@@ -49,6 +49,7 @@ AC_PROG_CC
 # AC_CONFIG_MACRO_DIR([..])
 AC_CONFIG_FILES([Makefile])
 AM_ENABLE_MULTILIB(, ..)
+AC_FUNC_ALLOCA
 
 # Get target configury.
 . ${srcdir}/configure.tgt

libcilkrts/runtime/cilk_fiber-unix.cpp

@@ -44,7 +44,20 @@
 #include <cstdio>
 #include <cstdlib>
 
-#include <alloca.h>
+#if defined HAVE_ALLOCA_H
+# include <alloca.h>
+#elif defined __GNUC__
+# define alloca __builtin_alloca
+#elif defined _AIX
+# define alloca __alloca
+#else
+# include <stddef.h>
+# ifdef  __cplusplus
+extern "C"
+# endif
+void *alloca (size_t);
+#endif
+
 #include <errno.h>
 #include <sys/mman.h>
 #include <unistd.h>
@@ -150,7 +163,8 @@ NORETURN cilk_fiber_sysdep::jump_to_resume_other_sysdep(cilk_fiber_sysdep* other
     __cilkrts_bug("Should not get here");
 }
 
-
+#pragma GCC push_options
+#pragma GCC optimize ("-O0")
 NORETURN cilk_fiber_sysdep::run()
 {
     // Only fibers created from a pool have a proc method to run and execute. 
@@ -214,6 +228,7 @@ NORETURN cilk_fiber_sysdep::run()
     // User proc should never return.
     __cilkrts_bug("Should not get here");
 }
+#pragma GCC pop_options
 
 void cilk_fiber_sysdep::make_stack(size_t stack_size)
 {

libcilkrts/runtime/config/x86/cilk-abi-vla.c

@@ -58,15 +58,34 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <stdint.h>
-#ifdef _WIN32
+
+// Getting a definition for alloca appears to be a pain in the butt.  Here's
+// a variant on what's recommended in the autoconf doc
+#if defined _MSC_VER
+# include <malloc.h>
 # define alloca _alloca
+#elif defined HAVE_ALLOCA_H
+# include <alloca.h>
+#elif defined __GNUC__
+# define alloca __builtin_alloca
+#elif defined _AIX
+# define alloca __alloca
+#else
+# include <stddef.h>
+# ifdef  __cplusplus
+extern "C"
+# endif
+void *alloca (size_t);
+#endif
+
+#ifdef _WIN32
 # define INLINE static __inline
 # pragma warning(disable:1025)  // Don't whine about zero extending result of unary operation
 #else
-# include <alloca.h>
 # define INLINE static inline
 #endif
 
+
 #include "internal/abi.h"
 #include "cilk-abi-vla-internal.h"
 

libcilkrts/runtime/sysdep-unix.c

@@ -80,7 +80,20 @@
 #include <string.h>
 #include <pthread.h>
 #include <unistd.h>
-#include <alloca.h>
+
+#if defined HAVE_ALLOCA_H
+# include <alloca.h>
+#elif defined __GNUC__
+# define alloca __builtin_alloca
+#elif defined _AIX
+# define alloca __alloca
+#else
+# include <stddef.h>
+# ifdef  __cplusplus
+extern "C"
+# endif
+void *alloca (size_t);
+#endif
 
 #ifdef __APPLE__
 //#   include <scheduler.h>  // Angle brackets include Apple's scheduler.h, not ours.