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Thank you for the suggestion. I'd like to share some test results using the current Xcode. When I added the flag `LDFLAGS=-Wl,-ld_classic` and configured PETSc with OpenMPI, the tests with the latest Xcode seemed okay, except for some link
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<meta charset="us-ascii"></head><body><pre style="font-family: sans-serif; font-size: 100%; white-space: pre-wrap; word-wrap: break-word">Thank you for the suggestion.
I'd like to share some test results using the current Xcode. When I added the flag `LDFLAGS=-Wl,-ld_classic` and configured PETSc with OpenMPI, the tests with the latest Xcode seemed okay, except for some link warnings. The configure command is
```
./configure \
PETSC_ARCH=arch-darwin-c-debug-openmpi \
LDFLAGS=-Wl,-ld_classic \
--download-openmpi=<a href="https://urldefense.us/v3/__https://download.open-mpi.org/release/open-mpi/v5.0/openmpi-5.0.3rc1.tar.bz2__;!!G_uCfscf7eWS!eGiVH2meEkLSEHvkY6Y-m7U1wPG4ZDxHod7lLZI3HTu6itzNEDm7n3cz4GNly925EEHvVRnyNQYn2aAt0ewiXz99$">https://urldefense.us/v3/__https://download.open-mpi.org/release/open-mpi/v5.0/openmpi-5.0.3rc1.tar.bz2__;!!G_uCfscf7eWS!eGiVH2meEkLSEHvkY6Y-m7U1wPG4ZDxHod7lLZI3HTu6itzNEDm7n3cz4GNly925EEHvVRnyNQYn2aAt0ewiXz99$</a> \
--download-mumps --download-scalapack \
--with-clean \
&& make && make check
```
The output of `make check`. (It seems that the Error below can be ignored.)
```
Running PETSc check examples to verify correct installation
Using PETSC_DIR=/Users/zzyang/workspace/repos/petsc and PETSC_ARCH=arch-darwin-c-debug-openmpi
C/C++ example src/snes/tutorials/ex19 run successfully with 1 MPI process
C/C++ example src/snes/tutorials/ex19 run successfully with 2 MPI processes
C/C++ example src/snes/tutorials/ex19 run successfully with MUMPS
*******************Error detected during compile or link!*******************
See <a href="https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!eGiVH2meEkLSEHvkY6Y-m7U1wPG4ZDxHod7lLZI3HTu6itzNEDm7n3cz4GNly925EEHvVRnyNQYn2aAt0abuucWB$">https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!eGiVH2meEkLSEHvkY6Y-m7U1wPG4ZDxHod7lLZI3HTu6itzNEDm7n3cz4GNly925EEHvVRnyNQYn2aAt0abuucWB$</a>
/Users/zzyang/workspace/repos/petsc/src/snes/tutorials ex5f
*********************************************************
/Users/zzyang/workspace/repos/petsc/arch-darwin-c-debug-openmpi/bin/mpif90 -Wl,-ld_classic -Wl,-search_paths_first -Wl,-no_compact_unwind -fPIC -Wall -ffree-line-length-none -ffree-line-length-0 -Wno-lto-type-mismatch -Wno-unused-dummy-argument -g -O0 -I/Users/zzyang/workspace/repos/petsc/include -I/Users/zzyang/workspace/repos/petsc/arch-darwin-c-debug-openmpi/include -I/opt/X11/include ex5f.F90 -Wl,-rpath,/Users/zzyang/workspace/repos/petsc/arch-darwin-c-debug-openmpi/lib -L/Users/zzyang/workspace/repos/petsc/arch-darwin-c-debug-openmpi/lib -Wl,-rpath,/opt/X11/lib -L/opt/X11/lib -Wl,-rpath,/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc/aarch64-apple-darwin23/13 -L/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc/aarch64-apple-darwin23/13 -Wl,-rpath,/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc -L/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc -Wl,-rpath,/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current -L/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current -lpetsc -ldmumps -lmumps_common -lpord -lpthread -lscalapack -llapack -lblas -lX11 -lmpi_usempif08 -lmpi_usempi_ignore_tkr -lmpi_mpifh -lmpi -lgfortran -ld_classic -lgfortran -lemutls_w -lquadmath -lc++ -o ex5f
ld: warning: -commons use_dylibs is no longer supported, using error treatment instead
ld: warning: duplicate -rpath '/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc/aarch64-apple-darwin23/13' ignored
ld: warning: duplicate -rpath '/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current' ignored
ld: warning: duplicate -rpath '/opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc' ignored
warning: (arm64) could not find object file symbol for symbol ___muldc3
Fortran example src/snes/tutorials/ex5f run successfully with 1 MPI process
Completed PETSc check examples
```
Best wishes,
Zongze
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