libpayload: Don't sneak in compiler includes

The way we got to include the compiler includes was kind of whacky.
Instead of mixing in potentially problematic headers, make libpayload
self-contained by adding some missing header files. Also clean up
conflicting definitions of size_t throughout the tree.

Signed-off-by: Stefan Reinauer <reinauer@google.com>

Change-Id: I0ad1194de1a00b7133c5477c00eb167d63a2ee85
Reviewed-on: https://gerrit.chromium.org/gerrit/47608
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
Commit-Queue: Stefan Reinauer <reinauer@google.com>
Tested-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/3058
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

payloads/libpayload/Makefile.inc

@@ -53,9 +53,7 @@ subdirs-$(CONFIG_CURSES) += curses
 subdirs-$(CONFIG_CBFS) += libcbfs
 subdirs-$(CONFIG_LZMA) += liblzma
 
-CC_INCLUDE = $(shell $(CC) -print-search-dirs | head -n 1 | cut -d' ' -f2)include
+INCLUDES := -Iinclude -Iinclude/$(ARCHDIR-y) -I$(obj)
-
-INCLUDES := -Iinclude -Iinclude/$(ARCHDIR-y) -I$(obj) -I$(CC_INCLUDE)
 CFLAGS =  $(EXTRA_CFLAGS) $(INCLUDES) -Os -pipe -nostdinc
 CFLAGS += -nostdlib -Wall -Wundef -Wstrict-prototypes -Wmissing-prototypes
 CFLAGS += -Wwrite-strings -Wredundant-decls -Wno-trigraphs

payloads/libpayload/include/armv7/arch/types.h

@@ -53,9 +53,6 @@ typedef signed long long s64;
 typedef long time_t;
 typedef long suseconds_t;
 
-typedef unsigned long size_t;
-typedef long ssize_t;
-
 #ifndef NULL
 #define NULL ((void *)0)
 #endif

payloads/libpayload/include/stdarg.h

@@ -31,7 +31,20 @@
 #define _LIBPAYLOAD_STDARG_H
 
 #include <stddef.h>
+
+/* With GCC we use -nostdinc -ffreestanding to keep out system includes.
+ * Unfortunately this also gets us rid of the _compiler_ includes, like
+ * stdarg.h. To work around the issue, we define varargs directly here.
+ * On LLVM we can still just include stdarg.h.
+ */
+#ifdef __GNUC__
+#define va_start(v,l)		__builtin_va_start(v,l)
+#define va_end(v)		__builtin_va_end(v)
+#define va_arg(v,l)		__builtin_va_arg(v,l)
+typedef __builtin_va_list	va_list;
+#else
 #include_next <stdarg.h>
+#endif
 
 /**
  * @defgroup vprintf Varargs print functions

payloads/libpayload/include/stddef.h

@@ -0,0 +1,11 @@
+
+#include <arch/types.h>
+
+#ifndef __SIZE_TYPE__
+#define __SIZE_TYPE__ unsigned long
+#endif
+typedef __SIZE_TYPE__ size_t;
+typedef long ssize_t;
+
+#define offsetof(TYPE, MEMBER)	((size_t) &((TYPE *) 0)->MEMBER)
+

payloads/libpayload/include/unistd.h

@@ -32,8 +32,6 @@
 
 #include <stddef.h>
 
-typedef ptrdiff_t ssize_t;
-
 int getpagesize(void);
 
 #endif

payloads/libpayload/include/x86/arch/types.h

@@ -53,9 +53,6 @@ typedef signed long long s64;
 typedef long time_t;
 typedef long suseconds_t;
 
-typedef unsigned long size_t;
-typedef long ssize_t;
-
 #ifndef NULL
 #define NULL ((void *)0)
 #endif