first classification of mail-threads

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+instruction: 0.778
+semantic: 0.635
+mistranslation: 0.537
+other: 0.236
+
+[Qemu-devel] [BUG] Failed to compile using gcc7.1
+
+Hi all,
+
+After upgrading gcc from 6.3.1 to 7.1.1, qemu can't be compiled with gcc.
+
+The error is:
+
+------
+  CC      block/blkdebug.o
+block/blkdebug.c: In function 'blkdebug_refresh_filename':
+block/blkdebug.c:693:31: error: '%s' directive output may be truncated
+writing up to 4095 bytes into a region of size 4086
+[-Werror=format-truncation=]
+"blkdebug:%s:%s", s->config_file ?: "",
+                               ^~
+In file included from /usr/include/stdio.h:939:0,
+                 from /home/adam/qemu/include/qemu/osdep.h:68,
+                 from block/blkdebug.c:25:
+/usr/include/bits/stdio2.h:64:10: note: '__builtin___snprintf_chk'
+output 11 or more bytes (assuming 4106) into a destination of size 4096
+return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
+          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+        __bos (__s), __fmt, __va_arg_pack ());
+        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+cc1: all warnings being treated as errors
+make: *** [/home/adam/qemu/rules.mak:69: block/blkdebug.o] Error 1
+------
+
+It seems that gcc 7 is introducing more restrict check for printf.
+If using clang, although there are some extra warning, it can at least
+pass the compile.
+Thanks,
+Qu
+