Sorry to dig up this old thread, but this is triggering false positives while 
make checking for people who don’t want to toy around with 
MACOSX_DEPLOYMENT_TARGET.
Could/should we filter this somehow, or have BuildSystem tinker with the 
environment variable itself?

Thanks,
Pierre

$ make check
Running check examples to verify correct installation
Using PETSC_DIR=/Users/jolivet/repo/petsc and 
PETSC_ARCH=arch-darwin-c-debug-real
*******************Error detected during compile or link!*******************
See http://www.mcs.anl.gov/petsc/documentation/faq.html
/Users/jolivet/repo/petsc/src/snes/tutorials ex19
*********************************************************************************
mpicc -Wl,-bind_at_load -Wl,-multiply_defined,suppress -Wl,-multiply_defined 
-Wl,suppress -Wl,-commons,use_dylibs -Wl,-search_paths_first 
-Wl,-no_compact_unwind -Wall -g  -Wall -g    
-I/Users/jolivet/repo/petsc/include 
-I/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/include 
-I/opt/intel/mkl/include     ex19.c  
-Wl,-rpath,/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib 
-L/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib 
-Wl,-rpath,/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib 
-L/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib 
-Wl,-rpath,/opt/intel/mkl/lib -L/opt/intel/mkl/lib -Wl,-rpath,/opt/intel/lib 
-L/opt/intel/lib -Wl,-rpath,/usr/local/Cellar/mpich/3.4.1_1/lib 
-L/usr/local/Cellar/mpich/3.4.1_1/lib 
-Wl,-rpath,/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0
 -L/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0 
-Wl,-rpath,/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10 
-L/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10 -lpetsc -lHYPRE -lcmumps -ldmumps 
-lsmumps -lzmumps -lmumps_common -lpord -lmkl_scalapack_lp64 
-lmkl_blacs_mpich_lp64 -lEl -lElSuiteSparse -lpmrrr -lp4est -lsc -liomp5 
-lmkl_intel_lp64 -lmkl_intel_thread -lmkl_core -lparmmg -lmmg -lmmg3d 
-lptesmumps -lptscotchparmetis -lptscotch -lptscotcherr -lesmumps -lscotch 
-lscotcherr -lparmetis -lmetis -ltriangle -ltet -lz -lX11 -lc++ -ldl -lmpifort 
-lmpi -lpmpi -lgfortran -lquadmath -lm -lc++ -ldl -o ex19
ld: warning: dylib (/usr/local/Cellar/mpich/3.4.1_1/lib/libmpifort.dylib) was 
built for newer macOS version (11.1) than being linked (11.0)
ld: warning: dylib 
(/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10/libgfortran.dylib) was built for 
newer macOS version (11.2) than being linked (11.0)
ld: warning: dylib 
(/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10/libquadmath.dylib) was built for 
newer macOS version (11.2) than being linked (11.0)
ld: warning: dylib 
(/usr/local/Cellar/gcc/10.2.0_4/lib/gcc/10/libquadmath.0.dylib) was built for 
newer macOS version (11.2) than being linked (11.0)
ld: warning: object file 
(/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib/libcmumps.a(cana_aux.o))
 was built for newer macOS version (11.2) than being linked (11.0)
ld: warning: object file 
(/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib/libdmumps.a(dana_aux.o))
 was built for newer macOS version (11.2) than being linked (11.0)
ld: warning: object file 
(/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib/libsmumps.a(sana_aux.o))
 was built for newer macOS version (11.2) than being linked (11.0)
ld: warning: object file 
(/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib/libzmumps.a(zana_aux.o))
 was built for newer macOS version (11.2) than being linked (11.0)
ld: warning: object file 
(/Users/jolivet/repo/petsc/arch-darwin-c-debug-real/lib/libmumps_common.a(front_data_mgt_m.o))
 was built for newer macOS version (11.2) than being linked (11.0)
C/C++ example src/snes/tutorials/ex19 run successfully with 1 MPI process


> On 15 Feb 2021, at 6:08 PM, Jacob Faibussowitsch <jacob....@gmail.com> wrote:
> 
> Yes, this also seems to work on my end.
> 
> Best regards,
> 
> Jacob Faibussowitsch
> (Jacob Fai - booss - oh - vitch)
> Cell: (312) 694-3391
> 
>> On Feb 15, 2021, at 12:05, Satish Balay <ba...@mcs.anl.gov 
>> <mailto:ba...@mcs.anl.gov>> wrote:
>> 
>> Does setting MACOSX_DEPLOYMENT_TARGET also work?
>> 
>> Satish
>> 
>> On Mon, 15 Feb 2021, Jacob Faibussowitsch wrote:
>> 
>>> I think this problem ultimately stems from the fact that gcc/g++ and 
>>> gfortran are not from the same people on macOS. It seems like clang is 
>>> configured to build for 11.0 target, whilst gcc defaults to newest 
>>> available target. And indeed if I change my compile command there is no 
>>> warning:
>>> 
>>> mkdir -p build && gfortran -c -o ./build/conftest.o conftest.F90 && gcc-10 
>>> -o ./build/libconftest.dylib ./build/conftest.o -dynamiclib -undefined 
>>> dynamic_lookup && rm -rf ./build
>>> 
>>> Note I now call gcc-10 as the linker which is the __actual__ gcc (not clang 
>>> in a trench coat).
>>> 
>>> Best regards,
>>> 
>>> Jacob Faibussowitsch
>>> (Jacob Fai - booss - oh - vitch)
>>> Cell: (312) 694-3391
>>> 
>>>> On Feb 15, 2021, at 11:46, Jacob Faibussowitsch <jacob....@gmail.com 
>>>> <mailto:jacob....@gmail.com>> wrote:
>>>> 
>>>> 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....@gmail.com 
>>>>> <mailto:jacob....@gmail.com> <mailto:jacob....@gmail.com 
>>>>> <mailto:jacob....@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 <ba...@mcs.anl.gov 
>>>>>> <mailto:ba...@mcs.anl.gov> <mailto:ba...@mcs.anl.gov 
>>>>>> <mailto:ba...@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> 
>>>>>> <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
> 

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