On Wed, 22 May 2019 at 16:09, Jonny Grant <jg@xxxxxxxx> wrote: > > Hi! > > On 22/05/2019 15:25, Jonathan Wakely wrote: > > On Wed, 22 May 2019 at 15:12, Jonny Grant <jg@xxxxxxxx> wrote: > >> > >> Hello > >> > >> This is a little test case. It is not real code. > >> > >> We used gcc-8 to get some warnings, but on the godbolt trunk gcc doesn't > >> those warnings with this little test case. Am I missing something > >> obvious? Is this an issue? > >> > >> with gcc-8 only (1) of the (3) occurrences of NULL is warned. > > > > Why do you want a warning for use of NULL? > > To warn any use of 'NULL' macro in C++ code, and ensure 'nullptr' is used. > > Does g++ have another way to warn for 'NULL'? > > > https://gcc.gnu.org/r260973 stopped GCC from giving that warning for > > uses of NULL, because it's not a literal zero. > > ah ok. That's a shame, it only warns for this now: > ptr = 0; > > > https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html > > "-Wzero-as-null-pointer-constant (C++ and Objective-C++ only) > Warn when a literal ‘0’ is used as null pointer constant. This can be > useful to facilitate the conversion to nullptr in C++11." > > > Perhaps the manual options page could clarify ? > "This will not warn any 'NULL' usage." It says literal 0, which matches its behaviour.
