# AGRIF doesn't compile with gcc15 due to conflicting types **URL:** \ **Category:** Versions\ **Tags:** AGRIF\ **Created:** [12 May 2026 06:26 UTC](https://nemo-ocean.discourse.group/t/agrif-doesnt-compile-with-gcc15-due-to-conflicting-types/1022 "2026-05-12T06:26:34Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Franziska](https://avatars.discourse-cdn.com/v4/letter/f/8797f3/32.png) [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Post date:** [12 May 2026 06:26 UTC](https://nemo-ocean.discourse.group/t/agrif-doesnt-compile-with-gcc15-due-to-conflicting-types/1022/1 "2026-05-12T06:26:35Z")
Hi, when compiling an AGRIF configuration (e.g. AGRIF\_DEMO) using GCC 15 (which appears to be more restrict than previous versions) it fails with the following error message: ```auto .../nemo/ext/AGRIF/LIB/UtilFortran.c:266:6: error: conflicting types for 'Write_Closing_Module'; have 'void(int)' 266 | void Write_Closing_Module(int forend) | ^ ~~~~~~~~~~~~~~~~~~~ In file included from .../nemo/ext/AGRIF/LIB/UtilFortran.c:38: .../nemo/ext/AGRIF/LIB/decl.h:535:13: note: previous declaration of 'Write_Closing_Module' with type 'void(void)' 535 | extern void Write_Closing_Module(); | ^ ~~~~~~~~~~~~~~~~~~~ ``` This is in NEMO5; tested different branches including main. A fix or guidance on how to fix this is appreciated. Best regards Franziska ---
**Author:** ![smasson](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@smasson](https://nemo-ocean.discourse.group/u/smasson)\ **Post date:** [12 May 2026 07:50 UTC](https://nemo-ocean.discourse.group/t/agrif-doesnt-compile-with-gcc15-due-to-conflicting-types/1022/2 "2026-05-12T07:50:51Z")
Can you try this modification in `ext/AGRIF/LIB/decl.h` ```diff -extern void Write_Closing_Module(); +extern void Write_Closing_Module(int forend); ``` ---
**Author:** ![Franziska](https://avatars.discourse-cdn.com/v4/letter/f/8797f3/32.png) [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Post date:** [12 May 2026 08:43 UTC](https://nemo-ocean.discourse.group/t/agrif-doesnt-compile-with-gcc15-due-to-conflicting-types/1022/3 "2026-05-12T08:43:48Z")
Thanks a lot @smasson! That was quick and it works! I expected more conflicts of that kind to appear with all the similar definitions in decl.h but apparently this was the only one really running into a conflict. Side note: some „type mismatches" occur down the road, which I turned from errors into warnings through compiler flags, so this seems to be OK, at least for compilation but should probably be fixed at some point. ---
**Author:** ![smasson](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@smasson](https://nemo-ocean.discourse.group/u/smasson)\ **Post date:** [12 May 2026 09:04 UTC](https://nemo-ocean.discourse.group/t/agrif-doesnt-compile-with-gcc15-due-to-conflicting-types/1022/4 "2026-05-12T09:04:38Z")
I am happy to see that it works! I personally still encounter compilation errors that appear to be macOS-specific 😩 ```shell /Users/smasson/codes/nemo_main/mk/agrifpp.sh: line 73: 86018 Trace/BPT trap: 5 ${MYDIR}/conv ${MYDIR}/agrif_oce.in -rm -incdir ${MYDIR}/inc -comdirout ${MYDIR}/obj -convfile ${MYFILE} fcm_internal compile failed (34048) make: *** [/Users/smasson/codes/nemo_main/cfgs/AGRIF_DEMO/BLD_SCT_AGRIF/Makefile:608: dom_oce.f90] Error 1 make -s -f /Users/smasson/codes/nemo_main/cfgs/AGRIF_DEMO/BLD_SCT_AGRIF/Makefile -j 1 all failed (2) at /Users/smasson/codes/nemo_main/ext/FCM/bin/../lib/Fcm/Build.pm line 597. ``` Could you give us more details about the “type mismatches” you had? Which versions compiler flags did you use? ---
**Author:** ![Franziska](https://avatars.discourse-cdn.com/v4/letter/f/8797f3/32.png) [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Post date:** [12 May 2026 09:21 UTC](https://nemo-ocean.discourse.group/t/agrif-doesnt-compile-with-gcc15-due-to-conflicting-types/1022/5 "2026-05-12T09:21:27Z")
To turn type mismatches into warnings, I use `-fallow-argument-mismatch` Below I share my full list of compiler options, which I’ve been already using with gcc14 and older versions (that did not yet complain about the conflicting types). Particularly zero-initialization and fcommon were mandatory (see my [earlier ticket](https://nemo-ocean.discourse.group/t/agrif-memory-allocation-errors-when-compiled-with-gnu-nemo-5/984/4)). The type mismatches occur in ext/AGRIF/AGRIF\_FILES/ `modmpp.F90`, `modinterp.F90` and `modupdate.F90` with ```auto .../nemo/cfgs/AGRIF_DEMO/BLD/ppsrc/agrif/modmpp.f90:348:22: 348 | call MPI_SEND(sendtoproc(k),1,MPI_LOGICAL,k,etiquette,Agrif_mpi_comm,code) | 1 ...... 683 | call MPI_SEND( tab3D( imin(1):imax(1), & | 2 Warning: Type mismatch between actual argument at (1) and actual argument at (2) (LOGICAL(4)/REAL(8)). ...nemo/cfgs/AGRIF_DEMO/BLD/ppsrc/agrif/modmpp.f90:361:22: 361 | call MPI_RECV(res,1,MPI_LOGICAL,k,etiquette,Agrif_mpi_comm,statut,code) | 1 ...... 523 | call MPI_RECV(temprecv%array1,datasize,Agrif_MPI_prec,k,etiquette, & | 2 Warning: Type mismatch between actual argument at (1) and actual argument at (2) (LOGICAL(4)/REAL(8)). ``` ```auto .../nemo/cfgs/AGRIF_DEMO/BLD/ppsrc/agrif/modinterp.f90:732:27: 711 | call MPI_ALLGATHER(tab3,4*nbdim,MPI_INTEGER,tab4,4*nbdim,MPI_INTEGER,Agrif_mpi_comm,code) | 2 ...... 732 | call MPI_ALLGATHER(memberin1,1,MPI_LOGICAL,memberinall,1,MPI_LOGICAL,Agrif_mpi_comm,code) | 1 Warning: Type mismatch between actual argument at (1) and actual argument at (2) (LOGICAL(4)/INTEGER(4)). .../nemo/cfgs/AGRIF_DEMO/BLD/ppsrc/agrif/modinterp.f90:732:51: 711 | call MPI_ALLGATHER(tab3,4*nbdim,MPI_INTEGER,tab4,4*nbdim,MPI_INTEGER,Agrif_mpi_comm,code) | 2 ...... 732 | call MPI_ALLGATHER(memberin1,1,MPI_LOGICAL,memberinall,1,MPI_LOGICAL,Agrif_mpi_comm,code) | 1 Warning: Type mismatch between actual argument at (1) and actual argument at (2) (LOGICAL(4)/INTEGER(4)). ``` ```auto .../nemo/cfgs/AGRIF_DEMO/BLD/ppsrc/agrif/modupdate.f90:677:27: 665 | call MPI_ALLGATHER(tab3,4*nbdim,MPI_INTEGER,tab4,4*nbdim,MPI_INTEGER,Agrif_mpi_comm,code) | 2 ...... 677 | call MPI_ALLGATHER(memberin1,1,MPI_LOGICAL,memberinall,1,MPI_LOGICAL,Agrif_mpi_comm,code) | 1 Warning: Type mismatch between actual argument at (1) and actual argument at (2) (LOGICAL(4)/INTEGER(4)). .../nemo/cfgs/AGRIF_DEMO/BLD/ppsrc/agrif/modupdate.f90:677:51: 665 | call MPI_ALLGATHER(tab3,4*nbdim,MPI_INTEGER,tab4,4*nbdim,MPI_INTEGER,Agrif_mpi_comm,code) | 2 ...... 677 | call MPI_ALLGATHER(memberin1,1,MPI_LOGICAL,memberinall,1,MPI_LOGICAL,Agrif_mpi_comm,code) | 1 Warning: Type mismatch between actual argument at (1) and actual argument at (2) (LOGICAL(4)/INTEGER(4)). ``` arch.fcm ```auto %NCDF_INC -I%NCDF_HOME/include -I%HDF5_HOME/include %NCDF_LIB -L%HDF5_HOME/lib -L%NCDF_HOME/lib -L%NCDF_C_HOME/lib -lnetcdf -lnetcdff -lhdf5 -lz %XIOS_INC -I%XIOS_HOME/inc %XIOS_LIB -L%XIOS_HOME/lib -lxios -lstdc++ # key_nosignedzero required by NEMO5 %CPP cpp -P -Dkey_nosignedzero %FC mpif90 %FCFLAGS -O1 -fdefault-real-8 -ffree-line-length-none -fallow-argument-mismatch -finit-local-zero -finit-integer=0 -finit-real=zero -g -fbacktrace %FFLAGS %FCFLAGS %LD mpif90 %FPPFLAGS -P -traditional %LDFLAGS -Wl,--allow-multiple-definition %AR ar %ARFLAGS -r %MK gmake %USER_INC %XIOS_INC %NCDF_INC %USER_LIB %XIOS_LIB %NCDF_LIB %CC mpicc %CFLAGS -O0 -fcommon ``` I’m using gcc 15.2.0, openmpi 5.0.10, netcdf-fortran 4.6.2