my suggestion was to "compare compile commands" between a petsc example (via petsc makefile) and your application - with your makefile
Its best to use petsc formatted makefiles to avoid issues with compiler option mismatch https://urldefense.us/v3/__https://petsc.org/release/manual/getting_started/*writing-c-c-or-fortran-applications__;Iw!!G_uCfscf7eWS!fLLihqTez1EMMjLzlLEt8-aKcPazlSe4eGJSEfCb2j3P02GdALJLZKL-JF1E3SXUP8LjG4aB2jocfKGtWIR-Yqfxclk$ Either way - you might want to start with a currently working PETSc example (using a PETSc makefile) - and modify the makefile to your desired format - and see if it still works (with this petsc exampe code, and then use this updated makefile format with your application code) Also if your code was with v3.9 - then there are many changes in v3.23, so you would have to check the current example codes wrt how to use '#include', 'use' directives and other usages. Satish On Mon, 4 Aug 2025, kiran hegde wrote: > Hi Satish, > > I have tried the options ex5f, but getting the same error. > The code was running without any issues long back and I was using petsc > ver 3.9 using gcc 12.X.X. > My makefile flags are : > > FFLAGS = -march=native -O3 -pipe -ffree-form -cpp -ffree-line-length-none \ > -Wall -Wextra -Wtabs -Wintrinsics-std -Wsurprising > -Waliasing \ > -Wno-unused-parameter -Wno-unused-dummy-argument \ > -D$(MODEL) \ > -DVERSION=\"$(GIT_VERSION)\" \ > -I$(PETSC_DIR)/include > FPPFLAGS = -cpp -E -dM -C -P -D$(MODEL) > LDFLAGS = -lpetsc -L$(PETSC_DIR)/lib > LDFLAGS += -Wl,-rpath=$(PETSC_DIR)/lib > > Have i missed anything? > > > Regards, > Kiran > > > > > On Sun, Aug 3, 2025 at 9:56 PM Satish Balay <balay....@fastmail.org> wrote: > > > On Sun, 3 Aug 2025, kiran hegde wrote: > > > > > Hi, > > > > > > Please find the attached configure.log file. > > > PETSC installation successfully completes with make check, without any > > > error. > > > But, when compiling fortan codes with petsc library+include in the > > > makefile i get this error. > > > > Then likely your compile command is missing some options. you can: > > > > - compile a petsc example - say: > > cd src/snes/tutorials > > make ex5f > > > > - now compile your application > > > > - And compare the compile commands and see if there are any differences > > (missing options, wrong order of include files etc..) > > > > Satish > > > > >
