Makefile: copy determination test for the endian to Makefile.d

Copy the test code for endian detection in an extra directory to split
it from the main flashrom code.

Change-Id: I0c2420fd60d7d6a23c94c9962b06bfd7f3c86ad8
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/58270
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Makefile

@@ -164,8 +164,7 @@ endif
 # the lines below use CC itself.
 override TARGET_OS := $(call c_macro_test, Makefile.d/os_test.h)
 override ARCH      := $(call c_macro_test, Makefile.d/arch_test.h)
-override ENDIAN := $(strip $(call debug_shell,$(CC) $(CPPFLAGS) -E endiantest.c 2>/dev/null \
-    | tail -1))
+override ENDIAN    := $(call c_macro_test, Makefile.d/endian_test.h)
 
 ifeq ($(TARGET_OS), $(filter $(TARGET_OS), FreeBSD OpenBSD DragonFlyBSD))
 override CPPFLAGS += -I/usr/local/include
@@ -869,6 +868,8 @@ compiler: featuresavailable
 	@if [ $(ARCH) = unknown ]; then echo Aborting.; exit 1; fi
 	@echo Target OS is $(TARGET_OS)
 	@if [ $(TARGET_OS) = unknown ]; then echo Aborting.; exit 1; fi
+	@echo Target endian is $(ENDIAN)
+	@if [ $(ENDIAN) = unknown ]; then echo Aborting.; exit 1; fi
 ifeq ($(TARGET_OS), libpayload)
 	@$(CC) --version 2>&1 | grep -q coreboot || \
 		( echo "Warning: It seems you are not using coreboot's reference compiler."; \

Makefile.d/endian_test.h

@@ -0,0 +1,89 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2011 Carl-Daniel Hailfinger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program 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 General Public License for more details.
+ */
+
+/*
+ * This file determinate the target endian. It should only be used my the Makefile
+ */
+
+#if defined (__i386__) || defined (__x86_64__) || defined(__amd64__)
+/* All x86 is little-endian. */
+#define __FLASHROM_LITTLE_ENDIAN__ 1
+#elif defined (__mips) || defined (__mips__) || defined (__MIPS__) || defined (mips)
+/* MIPS can be either endian. */
+#if defined (__MIPSEL) || defined (__MIPSEL__) || defined (_MIPSEL) || defined (MIPSEL)
+#define __FLASHROM_LITTLE_ENDIAN__ 1
+#elif defined (__MIPSEB) || defined (__MIPSEB__) || defined (_MIPSEB) || defined (MIPSEB)
+#define __FLASHROM_BIG_ENDIAN__ 1
+#endif
+#elif defined(__powerpc) || defined(__powerpc__) || defined(__powerpc64__) || defined(__POWERPC__) || \
+      defined(__ppc__) || defined(__ppc64__) || defined(_M_PPC) || defined(_ARCH_PPC) || \
+      defined(_ARCH_PPC64) || defined(__ppc)
+/* PowerPC can be either endian. */
+#if defined (_BIG_ENDIAN) || defined (__BIG_ENDIAN__)
+#define __FLASHROM_BIG_ENDIAN__ 1
+#elif defined (_LITTLE_ENDIAN) || defined (__LITTLE_ENDIAN__)
+#define __FLASHROM_LITTLE_ENDIAN__ 1
+#endif
+#elif defined(__arm__) || defined(__TARGET_ARCH_ARM) || defined(_ARM) || defined(_M_ARM) || defined(__arm) || \
+      defined(__aarch64__)
+/* ARM can be either endian. */
+#if defined (__ARMEB__) || defined (__BIG_ENDIAN__)
+#define __FLASHROM_BIG_ENDIAN__ 1
+#elif defined (__ARMEL__) || defined (__LITTLE_ENDIAN__)
+#define __FLASHROM_LITTLE_ENDIAN__ 1
+#endif
+#elif defined (__sparc__) || defined (__sparc)
+/* SPARC is big endian in general (but allows to access data in little endian too). */
+#define __FLASHROM_BIG_ENDIAN__ 1
+#elif defined(__arc__)
+#if defined(__BIG_ENDIAN__)
+#define __FLASHROM_BIG_ENDIAN__ 1
+#else
+#define __FLASHROM_LITTLE_ENDIAN__ 1
+#endif
+#endif
+
+#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)
+/* If architecture-specific approaches fail try generic variants. First: BSD (works about everywhere). */
+#if !(defined(_WIN32) || defined(_WIN64) || defined(__WIN32__) || defined(__WINDOWS__))
+#include <sys/param.h>
+#if defined (__BYTE_ORDER)
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define __FLASHROM_LITTLE_ENDIAN__
+#elif __BYTE_ORDER == __BIG_ENDIAN
+#define __FLASHROM_BIG_ENDIAN__
+#else
+#error Unknown byte order!
+#endif
+#endif /* defined __BYTE_ORDER */
+#endif /* !IS_WINDOWS */
+#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)
+/* Nonstandard libc-specific macros for determining endianness. */
+/* musl provides an endian.h as well... but it can not be detected from within C. */
+#if defined(__GLIBC__)
+#include <endian.h>
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define __FLASHROM_LITTLE_ENDIAN__ 1
+#elif BYTE_ORDER == BIG_ENDIAN
+#define __FLASHROM_BIG_ENDIAN__ 1
+#endif
+#endif
+#endif
+#endif
+#if defined(__FLASHROM_LITTLE_ENDIAN__)
+"little"
+#else
+"big"
+#endif

endiantest.c

@@ -1,6 +0,0 @@
-#include "platform.h"
-#if defined(__FLASHROM_LITTLE_ENDIAN__)
-little
-#else
-big
-#endif