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[PATCH gnumach] Support GCC 7


From: David Michael
Subject: [PATCH gnumach] Support GCC 7
Date: Sat, 06 May 2017 12:13:01 -0700

* Makefile.am (clib_routines): Add __udivmoddi4.
* linux/src/include/linux/compiler-gcc7.h: New file.
---
 Makefile.am                             |  2 +-
 linux/src/include/linux/compiler-gcc7.h | 67 +++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 linux/src/include/linux/compiler-gcc7.h

diff --git a/Makefile.am b/Makefile.am
index 67252db..e7527ab 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -162,7 +162,7 @@ noinst_PROGRAMS += \
 
 # This is the list of routines we decide is OK to steal from the C library.
 clib_routines := htonl htons ntohl ntohs                       \
-                udivdi3 __udivdi3 __umoddi3                    \
+                udivdi3 __udivdi3 __udivmoddi4 __umoddi3       \
                 __rel_iplt_start __rel_iplt_end                \
                 __ffsdi2                                       \
                 _START _start etext _edata end _end # actually ld magic, not 
libc.
diff --git a/linux/src/include/linux/compiler-gcc7.h 
b/linux/src/include/linux/compiler-gcc7.h
new file mode 100644
index 0000000..02c5bea
--- /dev/null
+++ b/linux/src/include/linux/compiler-gcc7.h
@@ -0,0 +1,67 @@
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc7.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.
+ *
+ * (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 */
+
+#define KASAN_ABI_VERSION 4
-- 
2.7.4




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