[MacPorts] #69875: libgcc7 build failed (MacOS Big Sur)

[MacPorts]

#69875: libgcc7 build failed (MacOS Big Sur)
----------------------+--------------------
  Reporter:  clegra   |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.9.3
Resolution:           |   Keywords:
      Port:  libgcc7  |
----------------------+--------------------
Changes (by ryandesign):

 * keywords:  libgcc7 build fail =>


Old description:

> under MacOS 11.7.10, libgcc7 repeatedly fails to build
>
> --->  Building libgcc7
> Error: Failed to build libgcc7: command execution failed
> Error: See
> /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/libgcc7/main.log
> for details.
> Error: Problem while installing libgcc7
> Error: rev-upgrade failed: Error rebuilding gcc7

New description:

 under MacOS 11.7.10, libgcc7 repeatedly fails to build

 {{{
 --->  Building libgcc7
 Error: Failed to build libgcc7: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/libgcc7/main.log
 for details.
 Error: Problem while installing libgcc7
 Error: rev-upgrade failed: Error rebuilding gcc7
 }}}

--

Comment:

 gcc7 and libgcc7 are indeed for OS X 10.10 and earlier. They are not
 expected to be compatible with later macOS versions. Use a newer gcc port
 instead.

 The error in the log is:

 {{{
 /usr/bin/clang++ -arch x86_64 -std=gnu++98   -g  -DIN_GCC    -fno-strict-
 aliasing -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall
 -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-format -Wmissing-format-
 attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-
 macros -Wno-overlength-strings -fno-common  -DHAVE_CONFIG_H
 -DGENERATOR_FILE -fno-PIE -L/opt/local/lib
 -Wl,-headerpad_max_install_names
 -Wl,-syslibroot,/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk -no-
 pie -o build/gencondmd \
             build/gencondmd.o ../build-x86_64-apple-
 darwin20/libiberty/libiberty.a
 clang: warning: argument unused during compilation: '-no-pie' [-Wunused-
 command-line-argument]
 Undefined symbols for architecture x86_64:
   "_cfun", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_epilogue_completed", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_flag_finite_math_only", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_flag_fp_int_builtin_inexact", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_flag_peephole2", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_flag_pic", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_flag_rounding_math", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_flag_trapping_math", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_flag_unsafe_math_optimizations", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_insn", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_arch_features", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_cmodel", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_fpmath", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_indirect_branch_register", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_isa_flags", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_isa_flags2", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_pmode", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_stack_protector_guard", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_tls_dialect", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ix86_tune_features", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_operands", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_optimize", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_ptr_mode", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_reload_completed", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_reload_in_progress", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_rtx_class", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_target_flags", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_this_target_flag_state", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_word_mode", referenced from:
       ___cxx_global_var_init in gencondmd.o
   "_x86_prefetch_sse", referenced from:
       ___cxx_global_var_init in gencondmd.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 make[3]: *** [build/gencondmd] Error 1
 make[3]: *** Waiting for unfinished jobs....
 }}}

 Nothing in the dependency chain of the subversion port requires any gcc
 port—not with default variants on macOS 12 anyway.

-- 
Ticket URL: <https://trac.macports.org/ticket/69875#comment:2>
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