20160921

RISC-V 커널 컴파일
Rocket Chip에 올라가는 리눅스 커널을 수정하기 위해 커널 컴파일을 시도했다. 이 링크를 보고 컴파일했으나 오류가 발생했다.

  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CC      scripts/mod/devicetable-offsets.s
In file included from include/linux/compiler.h:54:0,
                 from include/uapi/linux/stddef.h:1,                 from include/linux/stddef.h:4,
                 from ./include/uapi/linux/posix_types.h:4,
                 from include/uapi/linux/types.h:13,
                 from include/linux/types.h:5,
                 from include/linux/mod_devicetable.h:11,                 from scripts/mod/devicetable-offsets.c:2:
include/linux/compiler-gcc.h:121:30: fatal error: linux/compiler-gcc6.h: No such file or directory #include gcc_header(__GNUC__)
                              ^
compilation terminated.
scripts/Makefile.build:153: recipe for target 'scripts/mod/devicetable-offsets.s' failedmake[2]: *** [scripts/mod/devicetable-offsets.s] Error 1
scripts/Makefile.build:403: recipe for target 'scripts/mod' failed
make[1]: *** [scripts/mod] Error 2
Makefile:555: recipe for target 'scripts' failed
make: *** [scripts] Error 2

이 링크를 참고해서 다음 코드를 추가해 빌드했더니 잘 되었다.

From 5d39bd421fc093e2c852316080538cef85a9e1a0 Mon Sep 17 00:00:00 2001
From: yocto <yocto@yocto.org>
Date: Thu, 2 Jun 2016 00:18:33 -0500
Subject: [PATCH] Fix the compile issue under gcc6

Fix the following build error:
| .../include/linux/compiler-gcc.h:106:30: fatal error: linux/compiler-gcc6.h: No such file or directory
| #include gcc_header(__GNUC__)

Signed-off-by: Zhenhua Luo <zhenhua.luo@nxp.com>

Upstream-Status: Pending
---
 include/linux/compiler-gcc6.h | 66 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 include/linux/compiler-gcc6.h

diff --git a/include/linux/compiler-gcc6.h b/include/linux/compiler-gcc6.h
new file mode 100644
index 0000000..cdd1cc2
--- /dev/null
+++ b/include/linux/compiler-gcc6.h
@@ -0,0 +1,66 @@
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include 	<linux/compiler-gcc5.h> directly, include 	<linux/compiler.h> instead."
+#endif
+
+#define __used				__attribute__((__used__))
+#define __must_check			__attribute__((warn_unused_result))
+#define __compiler_offsetof(a, b)	__builtin_offsetof(a, b)
+
+/* Mark functions as cold. gcc will assume any path leading to a call
+   to them will be unlikely.  This means a lot of manual unlikely()s
+   are unnecessary now for any paths leading to the usual suspects
+   like BUG(), printk(), panic() etc. [but let's keep them for now for
+   older compilers]
+
+   Early snapshots of gcc 4.3 don't support this and we can't detect this
+   in the preprocessor, but we can live with this because they're unreleased.
+   Maketime probing would be overkill here.
+
+   gcc also has a __attribute__((__hot__)) to move hot functions into
+   a special section, but I don't see any sense in this right now in
+   the kernel context */
+#define __cold			__attribute__((__cold__))
+
+#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
+
+#ifndef __CHECKER__
+# define __compiletime_warning(message) __attribute__((warning(message)))
+# define __compiletime_error(message) __attribute__((error(message)))
+#endif /* __CHECKER__ */
+
+/*
+ * Mark a position in code as unreachable.  This can be used to
+ * suppress control flow warnings after asm blocks that transfer
+ * control elsewhere.
+ *
+ * Early snapshots of gcc 4.5 don't support this and we can't detect
+ * this in the preprocessor, but we can live with this because they're
+ * unreleased.  Really, we need to have autoconf for the kernel.
+ */
+#define unreachable() __builtin_unreachable()
+
+/* Mark a function definition as prohibited from being cloned. */
+#define __noclone	__attribute__((__noclone__))
+
+/*
+ * Tell the optimizer that something else uses this function or variable.
+ */
+#define __visible __attribute__((externally_visible))
+
+/*
+ * GCC 'asm goto' miscompiles certain code sequences:
+ *
+ *   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
+ *
+ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
+ * Fixed in GCC 4.8.2 and later versions.
+ *
+ * (asm goto is automatically volatile - the naming reflects this.)
+ */
+#define asm_volatile_goto(x...)	do { asm goto(x); asm (""); } while (0)
+
+#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
+#define __HAVE_BUILTIN_BSWAP32__
+#define __HAVE_BUILTIN_BSWAP64__
+#define __HAVE_BUILTIN_BSWAP16__
+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
--
2.5.0
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