[petsc-dev] Fortran macOS Linkage Warning

[Jacob Faibussowitsch]

Ok so if I pass -mmacosx-version-min=11.2 to the linker the warning disappears...

Best regards,

Jacob Faibussowitsch
(Jacob Fai - booss - oh - vitch)
Cell: (312) 694-3391

> On Feb 15, 2021, at 11:41, Jacob Faibussowitsch <jacob.fai at gmail.com> wrote:
> 
> 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 <balay at mcs.anl.gov <mailto:balay at mcs.anl.gov>> 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 <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
>>> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20210215/a609dbf7/attachment.html>