On Mar 28 16:02, Michael Haubenwallner wrote: > On 3/28/19 10:15 AM, Corinna Vinschen wrote: > > On Mar 28 09:34, Michael Haubenwallner wrote: > >> Hi Corinna, > >> > >> On 3/27/19 10:16 AM, Corinna Vinschen wrote: > >>> On Mar 27 09:26, Michael Haubenwallner wrote: > >>>> On 3/26/19 7:28 PM, Corinna Vinschen wrote: > >>> Wait, let me understand what's going on. IIUC you're building DLLs > >>> which are then used during the build job itself, right? > >> > >> Exactly. > >> FWIW, the CI builds also set up a Cygwin instance from scratch, > >> as I'm also after testing Cygwin (v3) itself to some degree: > >> https://dev.azure.com/gentoo-prefix/ci-builds/_build > >> > >> However, I've not found a commandline option for setup.exe to install > >> "test" versions... > >> > >>> As you know, 64 bit has a defined memory layout. Binutils ld is > >>> supposed to base the DLLs to a pseudo-random address in the area between > >>> 0x4:00000000 and 0x6:00000000. This area is occupied by un-rebased DLLs > >>> only. 8 Gigs is a *lot* of space for DLLs. > >>> > >>> That also means that the DLLs should not at all collide with windows > >>> objects (typically reserved in the lesser 2 Gigs area), unless they > >>> collide with themselves. At least that's the idea. > >>> > >>> Can you check what addresses the freshly built DLLs are based on by LD? > >>> Is there a chance that the algorithm used in LD is too dumb? > >> > >> I've also added system_printf to dll_list::reserve_space() when a dynloaded > >> dll was relocated, and each new address was below 0x0:01000000. The > >> attached > >> output also contains the preferred address, above 0x4:00000000 each. > > > > Do they actually collide with each other? Did you check the addresses? > > Yes, there is a real collision between installed dlls: > $ rebase -i /home/haubi/test-20190327/gentoo-prefix/usr/bin/cygcrypto-1.1.dll > /home/haubi/test-20190327/gentoo-prefix/usr/lib/python2.7/lib-dynload/_locale.dll > /home/haubi/test-20190327/gentoo-prefix/usr/bin/cygcrypto-1.1.dll > base 0x00041c650000 size 0x0027d000 * > /home/haubi/test-20190327/gentoo-prefix/usr/lib/python2.7/lib-dynload/_locale.dll > base 0x00041c6a0000 size 0x0002c000 *
Oh well, it would be nice if ld's hash algorithm would spread out DLLs better in the 8 Gigs space. > Is the cygwin1.dll from master branch available via setup.exe cmdline somehow? No, only from the snapshot page. I release a 3.0.5 soon, but 3.1 will be dev-only for a while. Corinna -- Corinna Vinschen Cygwin Maintainer
signature.asc
Description: PGP signature
