Hi, Park, I just search on GCC source code, found GCC support
"-Wstringop-overread" at least gcc-11.1.0, commit d14c547abd48("Add
-Wstringop-overread for reading past the end by string functions.").
AND found a testsuite gcc/gcc/testsuite/gcc.dg/pragma-diag-10.c
10 #pragma GCC diagnostic push
11 #pragma GCC diagnostic ignored "-Wstringop-overflow"
12 #pragma GCC diagnostic ignored "-Wstringop-overread"
13 if (c != 0)
14 return __builtin_memchr (s, c, (unsigned long)-1);
15 #pragma GCC diagnostic pop
it's totally same as this PATCH.
I think the motivation for this patch is to eliminate the compilation
warning, maybe one day we will compile the kernel with "-Werror -Wall",
at which point this compilation warning will turn into a compilation
error, and in case we already know it, we should fix this error in
advance.
For old gcc, we can add this?
#pragma GCC diagnostic push
+#if __GNUC__ >= 11 && __GNUC_MINOR__ >= 1
/* Ignore read(2) overflow and write(2) overread compile warnings */
#pragma GCC diagnostic ignored "-Wstringop-overread"
#pragma GCC diagnostic ignored "-Wstringop-overflow"
+#endif
What do you think?
Good day!
Rong Tao
