The following code w/ ToT LLVM (clang-15) produces the following warnings:
void *x(void) {
return (char*)0 + 42;
}
void *y(void) {
return (void*)0 + 42;
}
<source>:2:21: warning: arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension [-Wnull-pointer-arithmetic]
return (char*)0 + 42;
~~~~~~~~ ^
<source>:6:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
return (void*)0 + 42;
~~~~~~~~ ^
for the Linux kernel, we're using -std=gnu11 -Wno-gnu, so we should not be observing ANY warnings that we're using GNU C extensions.
I suspect that these two checks should be split into two different named command line flags, such that the one pertaining to GNU C extensions is placed within the -Wgnu flag group, such that -Wno-gnu implicitly disables it.
(link #4440)
As reported in this thread.
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