I can reproduce the warning compiling just that simple code you listed. This is the compile command:
mkdir -p build && gfortran -c -o ./build/conftest.o conftest.F90 && gcc -o ./build/libconftest.dylib ./build/conftest.o -dynamiclib -undefined dynamic_lookup && rm -rf ./build And error: ld: warning: object file (./build/conftest.o) was built for newer macOS version (11.2) than being linked (11.0) Note I recently uninstalled and reinstalled command line tools too, which does not seem to have fixed it. Best regards, Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch) Cell: (312) 694-3391 > On Feb 15, 2021, at 11:30, Satish Balay <[email protected]> wrote: > > Here is the compile command and the warning: > >>>>>>> > ===== Checking linker > Executing: gfortran -c -o > /var/folders/9w/7dlszmmn6q1gd5yf3r9n79bc0000gn/T/petsc-dk9aiv7x/config.setCompilers/conftest.o > > -I/var/folders/9w/7dlszmmn6q1gd5yf3r9n79bc0000gn/T/petsc-dk9aiv7x/config.setCompilers > > /var/folders/9w/7dlszmmn6q1gd5yf3r9n79bc0000gn/T/petsc-dk9aiv7x/config.setCompilers/conftest.F90 > > Successful compile: > Source: > function foo(a) > real:: a,x,bar > common /xx/ x > x=a > foo = bar(x) > end > Executing: gcc -o > /var/folders/9w/7dlszmmn6q1gd5yf3r9n79bc0000gn/T/petsc-dk9aiv7x/config.setCompilers/libconftest.dylib > -dynamiclib -single_module -undefined dynamic_lookup -multiply_defined > suppress > /var/folders/9w/7dlszmmn6q1gd5yf3r9n79bc0000gn/T/petsc-dk9aiv7x/config.setCompilers/conftest.o > > Possible ERROR while running linker: > stderr: > ld: warning: object file > (/var/folders/9w/7dlszmmn6q1gd5yf3r9n79bc0000gn/T/petsc-dk9aiv7x/config.setCompilers/conftest.o) > was built for newer macOS version (11.2) than being linked (11.0) > Accepted FC PIC code without compiler flag > > ============================================================================================= > <<<<<< > > Its likely due to the way brew built gfortran. You can try compiling a simple > test code and see if you can reproduce this warning. > > There is a related issue at: > > https://github.com/spack/spack/issues/21644 > > Satish > > > On Sat, 13 Feb 2021, Jacob Faibussowitsch wrote: > >> Hello All, >> >> I’ve been getting these warnings for weeks, at first I figured it was due to >> gfortran brew package not being updated for Big Sur, but since it has >> persisted through a few gfortran brew updates I’m thinking it may be petsc >> related. This is on clean build on master. >> >> ld: warning: object file >> (master-arch-darwin-c-debug/obj/sys/classes/bag/f2003-src/fsrc/bagenum.o) >> was built for newer macOS version (11.2) than being linked (11.0) >> ld: warning: object file >> (master-arch-darwin-c-debug/obj/sys/f90-src/fsrc/f90_fwrap.o) was built for >> newer macOS version (11.2) than being linked (11.0) >> ld: warning: object file >> (master-arch-darwin-c-debug/obj/sys/objects/f2003-src/fsrc/optionenum.o) was >> built for newer macOS version (11.2) than being linked (11.0) >> ld: warning: object file >> (master-arch-darwin-c-debug/obj/sys/fsrc/somefort.o) was built for newer >> macOS version (11.2) than being linked (11.0) >> ld: warning: object file >> (master-arch-darwin-c-debug/obj/sys/f90-mod/petscsysmod.o) was built for >> newer macOS version (11.2) than being linked (11.0) >> >> Best regards, >> >> Jacob Faibussowitsch >> (Jacob Fai - booss - oh - vitch) >> Cell: (312) 694-3391 >>
