linux-fslc-imx_4.9-1.0.x: Backport patches to fix building with gcc 9

Closes #192.

Signed-off-by: Tom Hochstein <tom.hochstein@nxp.com>

1 files changed, 132 insertions, 0 deletions

diff --git a/recipes-kernel/linux/linux-fslc-imx/0001-compiler-attributes-add-support-for-copy-gcc-9.patch b/recipes-kernel/linux/linux-fslc-imx/0001-compiler-attributes-add-support-for-copy-gcc-9.patch
new file mode 100644
index 00000000..a234c0c3
--- /dev/null
+++ b/recipes-kernel/linux/linux-fslc-imx/0001-compiler-attributes-add-support-for-copy-gcc-9.patch
@@ -0,0 +1,132 @@
+From mboxrd@z Thu Jan  1 00:00:00 1970
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+From:   Stefan Agner <stefan@agner.ch>
+To:     gregkh@linuxfoundation.org
+Cc:     stable@vger.kernel.org,
+        Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
+        Martin Sebor <msebor@gcc.gnu.org>,
+        Nick Desaulniers <ndesaulniers@google.com>,
+        Stefan Agner <stefan@agner.ch>
+Subject: [PATCH BACKPORT 4.19 1/2] Compiler Attributes: add support for __copy (gcc >= 9)
+Date:   Tue,  4 Jun 2019 15:24:40 +0200
+Message-Id: <20190604132441.15383-1-stefan@agner.ch>
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+
+From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
+
+[ Upstream commit c0d9782f5b6d7157635ae2fd782a4b27d55a6013 ]
+
+>From the GCC manual:
+
+  copy
+  copy(function)
+
+    The copy attribute applies the set of attributes with which function
+    has been declared to the declaration of the function to which
+    the attribute is applied. The attribute is designed for libraries
+    that define aliases or function resolvers that are expected
+    to specify the same set of attributes as their targets. The copy
+    attribute can be used with functions, variables, or types. However,
+    the kind of symbol to which the attribute is applied (either
+    function or variable) must match the kind of symbol to which
+    the argument refers. The copy attribute copies only syntactic and
+    semantic attributes but not attributes that affect a symbol’s
+    linkage or visibility such as alias, visibility, or weak.
+    The deprecated attribute is also not copied.
+
+  https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
+
+The upcoming GCC 9 release extends the -Wmissing-attributes warnings
+(enabled by -Wall) to C and aliases: it warns when particular function
+attributes are missing in the aliases but not in their target, e.g.:
+
+    void __cold f(void) {}
+    void __alias("f") g(void);
+
+diagnoses:
+
+    warning: 'g' specifies less restrictive attribute than
+    its target 'f': 'cold' [-Wmissing-attributes]
+
+Using __copy(f) we can copy the __cold attribute from f to g:
+
+    void __cold f(void) {}
+    void __copy(f) __alias("f") g(void);
+
+This attribute is most useful to deal with situations where an alias
+is declared but we don't know the exact attributes the target has.
+
+For instance, in the kernel, the widely used module_init/exit macros
+define the init/cleanup_module aliases, but those cannot be marked
+always as __init/__exit since some modules do not have their
+functions marked as such.
+
+Cc: <stable@vger.kernel.org> # 4.14+
+Suggested-by: Martin Sebor <msebor@gcc.gnu.org>
+Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
+Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
+Signed-off-by: Stefan Agner <stefan@agner.ch>
+---
+ include/linux/compiler-gcc.h   | 4 ++++
+ include/linux/compiler_types.h | 4 ++++
+ 2 files changed, 8 insertions(+)
+
+Index: git/include/linux/compiler-gcc.h
+===================================================================
+--- git.orig/include/linux/compiler-gcc.h
++++ git/include/linux/compiler-gcc.h
+@@ -282,6 +282,10 @@
+ 
+ #endif /* gcc version >= 40000 specific checks */
+ 
++#if GCC_VERSION >= 90100
++#define __copy(symbol)                 __attribute__((__copy__(symbol)))
++#endif
++
+ #if !defined(__noclone)
+ #define __noclone      /* not needed */
+ #endif