examples/shallow_sphere gives segmentation fault

[rjleveque]

I'm trying to build the pyclaw galleries and everything works fine with v5.7.0rc except in examples/shallow_sphere where running Rossby_wave.py or test_shallow_sphere.py gives a segmentation fault.

[mandli]

I got it to work with 5.7, what seg fault were you seeing?

[rjleveque]

Not very informative:

[shallow_sphere] como $ python Rossby_wave.py 
Segmentation fault: 11

Googling segmentation fault 11 python turns up various discussions but they all seem a few years old.

[mandli]

Ug, wish we had better error codes with this stuff. I will try and see if I can reproduce this again then and report back.

[mandli]

If you remove the *.so files in that examples directory does the f2py wrapping give any errors?

[rjleveque]

Just some new gfortran warnings similar to what I get these days with the fortran code...

(geo5) [shallow_sphere] como $ python Rossby_wave.py 
/Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/util.py:78: UserWarning: missing extension modules
  warnings.warn("missing extension modules")
/Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/util.py:79: UserWarning: running python setup.py build_ext -i in /Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/examples/shallow_sphere
  warnings.warn("running python setup.py build_ext -i in %s" % working_dir)
running build_ext
running build_src
build_src
building extension "shallow_sphere.classic2" sources
f2py options: []
  adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.c' to sources.
  adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere' to include_dirs.
  adding 'build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2-f2pywrappers.f' to sources.
building extension "shallow_sphere.problem" sources
f2py options: []
  adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.c' to sources.
  adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere' to include_dirs.
build_src: building npy-pkg config files
customize UnixCCompiler
customize UnixCCompiler using build_ext
get_default_fcompiler: matching types: '['gnu95', 'nag', 'absoft', 'ibm', 'intel', 'gnu', 'g95', 'pg']'
customize Gnu95FCompiler
Found executable /usr/local/bin/gfortran
customize Gnu95FCompiler
customize Gnu95FCompiler using build_ext
building 'shallow_sphere.classic2' extension
compiling C sources
C compiler: gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64 -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64

compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c'
compiling Fortran sources
Fortran f77 compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops
Fortran f90 compiler: /usr/local/bin/gfortran -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops
Fortran fix compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops
compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c'
gfortran:f90: ./step2qcor.f90
gfortran:f90: ./qcor.f90
./qcor.f90:2:27:

    2 |     subroutine qcor(ixy,i,m,aux,q,maxm,num_eqn,num_ghost,qc)
      |                           1
Warning: Unused dummy argument 'm' at (1) [-Wunused-dummy-argument]
gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/limiter.f90
gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/philim.f90
gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/flux2.f90
gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90
/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:111:55:

  111 |                     do 23 i = 1-num_ghost, mx+num_ghost
      |                                                       1
Warning: Fortran 2018 deleted feature: Shared DO termination label 23 at (1)
/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:117:59:

  117 |                         do 24 i = 1-num_ghost, mx+num_ghost
      |                                                           1
Warning: Fortran 2018 deleted feature: Shared DO termination label 24 at (1)
/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:124:59:

  124 |                         do 25 i = 1-num_ghost, mx+num_ghost
      |                                                           1
Warning: Fortran 2018 deleted feature: Shared DO termination label 25 at (1)
/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:193:55:

  193 |                     do 73 j = 1-num_ghost, my+num_ghost
      |                                                       1
Warning: Fortran 2018 deleted feature: Shared DO termination label 73 at (1)
/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:199:59:

  199 |                         do 74 j = 1-num_ghost, my+num_ghost
      |                                                           1
Warning: Fortran 2018 deleted feature: Shared DO termination label 74 at (1)
/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:206:59:

  206 |                         do 75 j = 1-num_ghost, my+num_ghost
      |                                                           1
Warning: Fortran 2018 deleted feature: Shared DO termination label 75 at (1)
gfortran:f77: build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2-f2pywrappers.f
/usr/local/bin/gfortran -Wall -g -arch x86_64 -Wall -g -undefined dynamic_lookup -bundle build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2module.o build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.o build/temp.macosx-10.7-x86_64-3.6/step2qcor.o build/temp.macosx-10.7-x86_64-3.6/qcor.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/limiter.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/philim.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/flux2.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.o build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2-f2pywrappers.o -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0 -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -lgfortran -o ./classic2.cpython-36m-darwin.so
building 'shallow_sphere.problem' extension
compiling C sources
C compiler: gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64 -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64

compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c'
compiling Fortran sources
Fortran f77 compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops
Fortran f90 compiler: /usr/local/bin/gfortran -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops
Fortran fix compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops
compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c'
gfortran:f90: ./mapc2p.f90
gfortran:f90: ./setaux.f90
./setaux.f90:76:42:

   76 |         do 15 i=1-num_ghost,mx+num_ghost+1
      |                                          1
Warning: Fortran 2018 deleted feature: Shared DO termination label 15 at (1)
./setaux.f90:104:40:

  104 |         do 20 i=1-num_ghost,mx+num_ghost
      |                                        1
Warning: Fortran 2018 deleted feature: Shared DO termination label 20 at (1)
gfortran:f90: ./qinit.f90
./qinit.f90:43:20:

   43 |         do 20 j=1,my
      |                    1
Warning: Fortran 2018 deleted feature: Shared DO termination label 20 at (1)
./qinit.f90:3:23:

    3 |     dx,dy,q,num_aux,aux,Rsphere)
      |                       1
Warning: Unused dummy argument 'aux' at (1) [-Wunused-dummy-argument]
./qinit.f90:50:0:

   50 |                 theta = dasin(yp/rad)
      | 
Warning: 'theta' may be used uninitialized in this function [-Wmaybe-uninitialized]
gfortran:f90: ./src2.f90
./src2.f90:2:25:

    2 |     subroutine src2(maxmx,maxmy,num_eqn,num_ghost,mx,my,xlower,ylower, &
      |                         1
Warning: Unused dummy argument 'maxmx' at (1) [-Wunused-dummy-argument]
./src2.f90:2:31:

    2 |     subroutine src2(maxmx,maxmy,num_eqn,num_ghost,mx,my,xlower,ylower, &
      |                               1
Warning: Unused dummy argument 'maxmy' at (1) [-Wunused-dummy-argument]
./src2.f90:2:49:

    2 |     subroutine src2(maxmx,maxmy,num_eqn,num_ghost,mx,my,xlower,ylower, &
      |                                                 1
Warning: Unused dummy argument 'num_ghost' at (1) [-Wunused-dummy-argument]
./src2.f90:3:25:

    3 |     dx,dy,q,num_aux,aux,t,dt,Rsphere)
      |                         1
Warning: Unused dummy argument 't' at (1) [-Wunused-dummy-argument]
/usr/local/bin/gfortran -Wall -g -arch x86_64 -Wall -g -undefined dynamic_lookup -bundle build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/problemmodule.o build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.o build/temp.macosx-10.7-x86_64-3.6/mapc2p.o build/temp.macosx-10.7-x86_64-3.6/setaux.o build/temp.macosx-10.7-x86_64-3.6/qinit.o build/temp.macosx-10.7-x86_64-3.6/src2.o -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0 -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -lgfortran -o ./problem.cpython-36m-darwin.so
/Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/util.py:84: UserWarning: successfully executed python setup.py build_ext -i in /Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/examples/shallow_sphere
  warnings.warn("successfully executed python setup.py build_ext -i in %s" % working_dir)
Segmentation fault: 11

[donnaaboise]

Have you tried using gdb to find the error? You wouldn’t need to know much gdb - just run it in gdb and when it crashes, look at the backtrace - “(gdb) bt”.

This said, I have found that most development tools (including gdb) on OSX are becoming more and more unusable. So I often have resorted using a Linux VM for debugging.

Donna Calhoun Associate Professor Department of Mathematics, Mathematics Bldg 241A Boise State University 1910 University Drive Boise, ID 83725-1555 (208) 426-3386 http://math.boisestate.edu/~calhoun

On Apr 22, 2020, at 6:33 PM, Randall J. LeVeque [email protected] wrote:

Just some new gfortran warnings similar to what I get these days with the fortran code...

(geo5) [shallow_sphere] como $ python Rossby_wave.py /Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/util.py:78: UserWarning: missing extension modules warnings.warn("missing extension modules") /Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/util.py:79: UserWarning: running python setup.py build_ext -i in /Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/examples/shallow_sphere warnings.warn("running python setup.py build_ext -i in %s" % working_dir) running build_ext running build_src build_src building extension "shallow_sphere.classic2" sources f2py options: [] adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.c' to sources. adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere' to include_dirs. adding 'build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2-f2pywrappers.f' to sources. building extension "shallow_sphere.problem" sources f2py options: [] adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.c' to sources. adding 'build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere' to include_dirs. build_src: building npy-pkg config files customize UnixCCompiler customize UnixCCompiler using build_ext get_default_fcompiler: matching types: '['gnu95', 'nag', 'absoft', 'ibm', 'intel', 'gnu', 'g95', 'pg']' customize Gnu95FCompiler Found executable /usr/local/bin/gfortran customize Gnu95FCompiler customize Gnu95FCompiler using build_ext building 'shallow_sphere.classic2' extension compiling C sources C compiler: gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64 -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64

compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c' compiling Fortran sources Fortran f77 compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops Fortran f90 compiler: /usr/local/bin/gfortran -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops Fortran fix compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c' gfortran:f90: ./step2qcor.f90 gfortran:f90: ./qcor.f90 ./qcor.f90:2:27:

2 |     subroutine qcor(ixy,i,m,aux,q,maxm,num_eqn,num_ghost,qc)
  |                           1

Warning: Unused dummy argument 'm' at (1) [-Wunused-dummy-argument] gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/limiter.f90 gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/philim.f90 gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/flux2.f90 gfortran:f90: /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90 /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:111:55:

111 | do 23 i = 1-num_ghost, mx+num_ghost | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 23 at (1) /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:117:59:

117 | do 24 i = 1-num_ghost, mx+num_ghost | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 24 at (1) /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:124:59:

124 | do 25 i = 1-num_ghost, mx+num_ghost | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 25 at (1) /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:193:55:

193 | do 73 j = 1-num_ghost, my+num_ghost | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 73 at (1) /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:199:59:

199 | do 74 j = 1-num_ghost, my+num_ghost | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 74 at (1) /Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.f90:206:59:

206 | do 75 j = 1-num_ghost, my+num_ghost | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 75 at (1) gfortran:f77: build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2-f2pywrappers.f /usr/local/bin/gfortran -Wall -g -arch x86_64 -Wall -g -undefined dynamic_lookup -bundle build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2module.o build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.o build/temp.macosx-10.7-x86_64-3.6/step2qcor.o build/temp.macosx-10.7-x86_64-3.6/qcor.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/limiter.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/philim.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/flux2.o build/temp.macosx-10.7-x86_64-3.6/Users/rjl/clawpack_src/clawpack_master/pyclaw/src/pyclaw/classic/step2ds.o build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/classic2-f2pywrappers.o -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0 -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -lgfortran -o ./classic2.cpython-36m-darwin.so building 'shallow_sphere.problem' extension compiling C sources C compiler: gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64 -I/Users/rjl/miniconda/envs/geo5/include -arch x86_64

compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c' compiling Fortran sources Fortran f77 compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops Fortran f90 compiler: /usr/local/bin/gfortran -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops Fortran fix compiler: /usr/local/bin/gfortran -Wall -g -ffixed-form -fno-second-underscore -Wall -g -fno-second-underscore -arch x86_64 -fPIC -O2 -fopenmp -O3 -funroll-loops compile options: '-Ibuild/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere -I/Users/rjl/miniconda/envs/geo5/lib/python3.6/site-packages/numpy/core/include -I/Users/rjl/miniconda/envs/geo5/include/python3.6m -c' gfortran:f90: ./mapc2p.f90 gfortran:f90: ./setaux.f90 ./setaux.f90:76:42:

76 | do 15 i=1-num_ghost,mx+num_ghost+1 | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 15 at (1) ./setaux.f90:104:40:

104 | do 20 i=1-num_ghost,mx+num_ghost | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 20 at (1) gfortran:f90: ./qinit.f90 ./qinit.f90:43:20:

43 | do 20 j=1,my | 1 Warning: Fortran 2018 deleted feature: Shared DO termination label 20 at (1) ./qinit.f90:3:23:

3 |     dx,dy,q,num_aux,aux,Rsphere)
  |                       1

Warning: Unused dummy argument 'aux' at (1) [-Wunused-dummy-argument] ./qinit.f90:50:0:

50 | theta = dasin(yp/rad) | Warning: 'theta' may be used uninitialized in this function [-Wmaybe-uninitialized] gfortran:f90: ./src2.f90 ./src2.f90:2:25:

2 |     subroutine src2(maxmx,maxmy,num_eqn,num_ghost,mx,my,xlower,ylower, &
  |                         1

Warning: Unused dummy argument 'maxmx' at (1) [-Wunused-dummy-argument] ./src2.f90:2:31:

2 |     subroutine src2(maxmx,maxmy,num_eqn,num_ghost,mx,my,xlower,ylower, &
  |                               1

Warning: Unused dummy argument 'maxmy' at (1) [-Wunused-dummy-argument] ./src2.f90:2:49:

2 |     subroutine src2(maxmx,maxmy,num_eqn,num_ghost,mx,my,xlower,ylower, &
  |                                                 1

Warning: Unused dummy argument 'num_ghost' at (1) [-Wunused-dummy-argument] ./src2.f90:3:25:

3 |     dx,dy,q,num_aux,aux,t,dt,Rsphere)
  |                         1

Warning: Unused dummy argument 't' at (1) [-Wunused-dummy-argument] /usr/local/bin/gfortran -Wall -g -arch x86_64 -Wall -g -undefined dynamic_lookup -bundle build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/problemmodule.o build/temp.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/build/src.macosx-10.7-x86_64-3.6/shallow_sphere/fortranobject.o build/temp.macosx-10.7-x86_64-3.6/mapc2p.o build/temp.macosx-10.7-x86_64-3.6/setaux.o build/temp.macosx-10.7-x86_64-3.6/qinit.o build/temp.macosx-10.7-x86_64-3.6/src2.o -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0 -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -L/usr/local/Cellar/gcc/9.2.0_3/lib/gcc/9/gcc/x86_64-apple-darwin18/9.2.0/../../.. -lgfortran -o ./problem.cpython-36m-darwin.so /Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/util.py:84: UserWarning: successfully executed python setup.py build_ext -i in /Users/rjl/clawpack_src/clawpack_master/clawpack/pyclaw/examples/shallow_sphere warnings.warn("successfully executed python setup.py build_ext -i in %s" % working_dir) Segmentation fault: 11 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/clawpack/pyclaw/issues/642#issuecomment-618109116, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAKXMQPNHXSNY6N3T7MZ26TRN6EE7ANCNFSM4MM4E22Q.

[ketch]

I wonder if those "shared DO termination label"s are actually a problem? We should get rid of them anyway. I'll do that later today.

[rjleveque]

I haven't run into problems with GeoClaw with the termination label warnings, but I agree we need to eventually clean it all up.

Also @mjberger recently noticed you can add the gfortran flag -std=legacy to FFLAGS to avoid some other problems with the latest gfortran not working on legacy code. I'm not sure how to add this to the f2py compilation however, since changing my FFLAGS for this example didn't have any effect.

[mandli]

f2py has a bit complex bit of flagging as it acts as C compiler, a Fortran compiler and somehow gets Python in there. I think if you want to do fortran flags you need to use the --f90flags= flag to f2py.

[ketch]

I cleaned up all the loop labels in https://github.com/clawpack/pyclaw/pull/643.