Thanks Tobias, I have reproduced the underlying issue with both GCC 14.2 and 15.1 ld on the current machine is 2.44
If you think it is appropriate we can also take this offline. Cheers Salvatore On Wed, Oct 15, 2025 at 3:56 PM Tobias Burnus <[email protected]> wrote: > Hi Salvatore, > > Salvatore Filippone wrote: > > I am stuck by a strange problem when compiling with > > -fopenacc -foffload=nvptx-none=-march=sm_75 > > a code that used to work until relatively recently, is now > > sistematically throwing the following (or similar) error: > > libgomp: Cannot map target functions or variables (expected 25, have 20) > > In order to associated global variables on the device > with those on the host ('acc declare') and, likewise, > for running compute regions – which internally are > split-off into functions, GCC uses a table on the > host and on the device to find the other side. > > Namely, if the compute region is entry 123 on the host, > we know that we have to launch the offload kernel which > is entry 123 on the device. > > The error message you got implies that this fails for > some reason as some table has too many/too few entries. > > The question is only why? > > * * * > > We found - and solved - a couple of those issues over > the time; there might be more. > > Let's that with the following questions: > > * What GCC version do you have (I guess a fairly recent one, > but still for completeness) > > * What version of Binutils / 'ld' do you have? ("ld --version") > > I know that one large failure was fixed in the following commit > on the Binutils side: > > b21318bd2c2 Add LDPT_REGISTER_CLAIM_FILE_HOOK_V2 linker plugin hook [GCC > PR109128] > (May 11, 2023) / https://gcc.gnu.org/PR109128 > and an associated GCC change. > > More recently (mid 2024), another fix was done. > On the GCC side, r15-3135-gcb51e0b236c7d4 is a follow up issue fix: > lto: Don't check obj.found for offload section > (Aug 23, 2024) / https://gcc.gnu.org/PR116361 > > But it also has a Binutils side, cf. > https://sourceware.org/bugzilla/show_bug.cgi?id=32083 > > I have not checked in which Binutils version those two fixes went. > > Tobias > >
