On Wed, 29 Oct 2025 at 21:53, Jonathan Wakely <[email protected]> wrote: > > On Wed, 29 Oct 2025 at 21:47, Jonathan Wakely <[email protected]> wrote: > > > > On Wed, 29 Oct 2025 at 21:31, Joel Sherrill <[email protected]> wrote: > > > > > > Hi > > > > > > I am starting a new thread on https://gcc.gnu.org/wiki/WarningHistory. It > > > looks useful but in need of an update. Before I spend more itme on it, I > > > wanted to make sure I am doing the archeology correctly. > > > > > > Use git diff with pairs of "adjacent" release tags. I did this for > > > 8.2.0->8.3.0->8.4.0->8.5.0 but didn't see any. This is the command for > > > what's new in 9.1.0. > > > > > > $ git diff releases/gcc-8.1.0 releases/gcc-9.1.0 -- common.opt > > > > > > And after wading through the output, I think this is the new set of > > > warnings in gcc 9.1.0. > > > > > > New in 9.1.0 > > > ============ > > > -Wattribute-alias > > > -Wattribute-warning > > > -Wcannot-profile > > > -Wdeprecated > > > -Wmissing-profile > > > > > > Does this process look correct to everyone? If so, I will update the wiki > > > page. > > > > -Wdeprecated is much older than GCC 9. You can check the manual for > > GCC 8.5.0 to see if the new warnings really are new, or were already > > documented for 8.5.0, and that shows -Wno-deprecated was present > > already. > > > > https://gcc.gnu.org/gcc-9/changes.html#c-family suggests that > > -Wattribute-alias already existed and was "enhanced" in gcc-9. > > > > That page also lists -Waddress-of-packed-member and -Wabsolute-value > > as new warnings, and five new C++ warnings, which weren't found by > > your method. Maybe there are other .opt files to consider, for > > C-specific and C++-specific warnings? > > Ah, I think I remembered the method I used for creating the content of > that page: > diff <( ~/gcc/8.5.0/bin/gcc --help=warnings -Q | sort) <( > ~/gcc/9.1.0/bin/gcc --help=warnings -Q | sort) > > Of course, this means you need to have every version of GCC installed! > > For the command above I get this output: > > 7a8 > > -Wabsolute-value [disabled] > 8a10 > > -Waddress-of-packed-member [enabled] > 15c17 > < -Walloc-size-larger-than= > --- > > -Walloc-size-larger-than= -1 > 18c20 > < -Walloca-larger-than=<number> 0 > --- > > -Walloca-larger-than=<number> -1 > 25c27,29 > < -Wattribute-alias [enabled] > --- > > -Wattribute-alias > > -Wattribute-alias=<0,2> 1 > > -Wattribute-warning [enabled] > 38a43 > > -Wc11-c2x-compat [enabled] > 40a46 > > -Wcannot-profile [enabled] > 44a51 > > -Wcast-result [disabled] > 49c56,57 > < -Wchkp [disabled] > --- > > -Wchkp > > -Wclass-conversion [enabled] > 67a76,77 > > -Wdeprecated-copy [disabled] > > -Wdeprecated-copy-dtor [disabled] > 103c113 > < -Wframe-larger-than=<number> > --- > > -Wframe-larger-than=<byte-size> -1 > 118a129 > > -Winit-list-lifetime [enabled] > 132c143 > < -Wlarger-than=<number> > --- > > -Wlarger-than=<byte-size> -1 > 151a163 > > -Wmissing-profile [enabled] > 158a171,173 > > -Wno-alloc-size-larger-than > > -Wno-alloca-larger-than > > -Wno-vla-larger-than > 183a199 > > -Wpessimizing-move [disabled] > 191a208 > > -Wprio-ctor-dtor [enabled] > 198a216 > > -Wredundant-move [disabled] > 227c245 > < -Wstack-usage=<number> 0 > --- > > -Wstack-usage=<byte-size> -1 > 298c316 > < -Wvla-larger-than=<number> 0 > --- > > -Wvla-larger-than=<number> -1 > > Some of these are changes to the default values, so not new warnings, > but it tells me these are new: > > -Wabsolute-value > -Waddress-of-packed-member > -Wattribute-warning > -Wc11-c2x-compat > -Wcannot-profile > -Wcast-result > -Wclass-conversion > -Wdeprecated-copy > -Wdeprecated-copy-dtor > -Winit-list-lifetime > -Wmissing-profile > -Wno-alloc-size-larger-than > -Wno-alloca-larger-than > -Wno-vla-larger-than > -Wpessimizing-move > -Wprio-ctor-dtor > -Wredundant-move
I've added everything up to 13.1
