Re: gcc param min-pagesize

Hello

 min-pagesize appears to no longer be on from https://gcc.gnu.org/onlinedocs/gcc/Option-Summary.html

Was the feature removed?

ps. Please include my email in any replies.

Thanks
Jonathan


> On 27/03/2023 12:42, Jonny Grant wrote:
>> Hello
>>
>> I saw this part of the manual documents "min-pagesize" added by Martin Liska.
>>
>> https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#Optimize-Options
>>
>> "min-pagesize
>> Minimum page size for warning purposes."
>>
>> Could anyone give more explanation of it's purpose please? It sounds very useful.
>>
>> I was expecting the value to be a pagesize, with zero disabling it. However, trying it out it seems it sets the lowest accessible address, is that the case? If so I can make a patch to clarify that in the manual.
>>
>> I did a test where I set it to 257 with a struct at 0x100 and that does give the array-bounds warning still, so maybe it's actually just the minimum address.
>>
>> https://godbolt.org/z/ohhv5eMvK
>>
>> I had read on this ticket about setting --param=min-pagesize=0 to allow access to the first 0x1000 address range (for embedded) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106699#c1
>>
>> Thanks
>> Jonny