Merge pull request #43 from AbsInt/standard-headers

Merge of the "standard-headers" branch. This  provides CompCert-compatible implementations of the following standard headers: float.h, stdarg.h, stdbool.h, stddef.h, varargs.h.

These are the headers that are provided by GCC, Clang, and TCC. Other standard headers are provided by Glibc and similar C standard libraries.

So far in CompCert we rely on the headers provided by whatever C compiler is installed on the host platform. This causes some difficulties that this branch addresses:
1- Diab C's stdarg.h is not compatible with CompCert
2- On IA32 and PowerPC, CompCert's "long double" type differs from the "long double" type specified by the ABI. Hence, the platform's float.h gives "long double" parameters that do not match CompCert. 

1 files changed, 81 insertions, 0 deletions

diff --git a/runtime/include/stddef.h b/runtime/include/stddef.h
new file mode 100644
index 00000000..3da06c6f
--- /dev/null
+++ b/runtime/include/stddef.h
@@ -0,0 +1,81 @@
+/* This file is part of the Compcert verified compiler.
+ *
+ * Copyright (c) 2015 Institut National de Recherche en Informatique et
+ *  en Automatique.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the <organization> nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
+ * HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* <stddef.h> -- common definitions (ISO C99 7.17) */
+
+#ifndef _STDDEF_H
+
+/* Glibc compatibility: if one of the __need_ macros is set,
+   just define the corresponding type or macro
+   and don't consider this file as fully included yet. */
+#if !defined(__need_size_t) && !defined(__need_ptrdiff_t) && !defined(__need_wchar_t) && !defined(__need_NULL)
+#define _STDDEF_H
+#endif
+
+#if defined(_STDDEF_H) || defined(__need_size_t)
+#ifndef _SIZE_T
+#define _SIZE_T
+typedef unsigned long size_t;
+#endif
+#undef __need_size_t
+#endif
+
+#if defined(_STDDEF_H) || defined(__need_ptrdiff_t)
+#ifndef _PTRDIFF_T
+#define _PTRDIFF_T
+typedef signed long ptrdiff_t;
+#endif
+#undef __need_ptrdiff_t
+#endif
+
+#if defined(_STDDEF_H) || defined(__need_wchar_t)
+#ifndef _WCHAR_T
+#define _WCHAR_T
+#ifdef _WIN32
+typedef unsigned short wchar_t;
+#else
+typedef signed int wchar_t;
+#endif
+#endif
+#undef __need_wchar_t
+#endif
+
+#if defined(_STDDEF_H) || defined(__need_NULL)
+#ifndef NULL
+#define NULL 0
+#endif
+#undef __need_NULL
+#endif
+
+#if defined(_STDDEF_H) && !defined(offsetof)
+#define offsetof(ty,member) ((size_t) &(((ty)*) NULL)->member)
+#endif
+
+#endif
+