[openwrt/openwrt] gcc: gcc 6.3.0 fix comparison between pointer and integer

[LEDE Commits]

blogic pushed a commit to openwrt/openwrt.git, branch lede-17.01:
https://git.lede-project.org/afa8873887664bbf42c8e7914dc572da2d3bcb79

commit afa8873887664bbf42c8e7914dc572da2d3bcb79
Author: Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk>
AuthorDate: Fri Jun 9 13:29:48 2017 +0100

    gcc: gcc 6.3.0 fix comparison between pointer and integer
    
    Fix FS#832
    
    /source/build_dir/toolchain-mips_74kc_gcc-6.3.0_musl/gcc-6.3.0/gcc/ubsan.c:
    In function 'bool ubsan_use_new_style_p(location_t)':
    /source/build_dir/toolchain-mips_74kc_gcc-6.3.0_musl/gcc-6.3.0/gcc/ubsan.c:1474:23:
    error: ISO C++ forbids comparison between pointer and integer
    [-fpermissive]
           || xloc.file == '\0' || xloc.file[0] == '\xff'
                           ^~~~
    make[5]: *** [Makefile:1085: ubsan.o] Error 1
    
    https://www.viva64.com/en/b/0425/#ID0EMGCI
    
    Signed-off-by: Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk>
    (cherry picked from commit 22e2b402aee17684781ae705a91fb3645299de9c)
---
 toolchain/gcc/patches/6.3.0/960-fix-ubsan-defref.patch | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/toolchain/gcc/patches/6.3.0/960-fix-ubsan-defref.patch b/toolchain/gcc/patches/6.3.0/960-fix-ubsan-defref.patch
new file mode 100644
index 0000000..72d86c1
--- /dev/null
+++ b/toolchain/gcc/patches/6.3.0/960-fix-ubsan-defref.patch
@@ -0,0 +1,11 @@
+--- a/gcc/ubsan.c
++++ b/gcc/ubsan.c
+@@ -1471,7 +1471,7 @@ ubsan_use_new_style_p (location_t loc)
+ 
+   expanded_location xloc = expand_location (loc);
+   if (xloc.file == NULL || strncmp (xloc.file, "\1", 2) == 0
+-      || xloc.file == '\0' || xloc.file[0] == '\xff'
++      || xloc.file[0] == '\0' || xloc.file[0] == '\xff'
+       || xloc.file[1] == '\xff')
+     return false;
+