The following commit is causing builds in master and for the recently released Ruby 3.0.0 to fail on darwin. This was tested on macOS Mojave using the most recent XCode and Mojave patches. The error reported is as follows:
compiling bigdecimal.c
In file included from bigdecimal.c:13:
./bigdecimal.h:122:1: error: redefinition of 'rb_array_const_ptr'
rb_array_const_ptr(VALUE a)
^
../.././include/ruby/internal/core/rarray.h:184:1: note: previous definition is here
rb_array_const_ptr(VALUE a)
^
In file included from bigdecimal.c:13:
./bigdecimal.h:139:1: error: static declaration of 'rb_sym2str' follows non-static declaration
rb_sym2str(VALUE sym)
^
../.././include/ruby/internal/symbol.h:63:7: note: previous declaration is here
VALUE rb_sym2str(VALUE);
^
bigdecimal.c:109:1: error: static declaration of 'rb_rational_num' follows non-static declaration
rb_rational_num(VALUE rat)
^
../.././include/ruby/internal/intern/rational.h:39:7: note: previous declaration is here
VALUE rb_rational_num(VALUE rat);
^
bigdecimal.c:121:1: error: static declaration of 'rb_rational_den' follows non-static declaration
rb_rational_den(VALUE rat)
^
../.././include/ruby/internal/intern/rational.h:40:7: note: previous declaration is here
VALUE rb_rational_den(VALUE rat);
^
bigdecimal.c:133:1: error: static declaration of 'rb_complex_real' follows non-static declaration
rb_complex_real(VALUE cmp)
^
../.././include/ruby/internal/intern/complex.h:38:7: note: previous declaration is here
VALUE rb_complex_real(VALUE z);
^
bigdecimal.c:145:1: error: static declaration of 'rb_complex_imag' follows non-static declaration
rb_complex_imag(VALUE cmp)
^
../.././include/ruby/internal/intern/complex.h:39:7: note: previous declaration is here
VALUE rb_complex_imag(VALUE z);
^
6 errors generated.
make[2]: *** [bigdecimal.o] Error 1
make[1]: *** [ext/bigdecimal/all] Error 2
make: *** [build-ext] Error 2
Reverting the following commit allows the build to run successfully:
Adding a data point to this. I've also tried reinstalling the CLTs on Catalina, but the build only succeeded with the reverted commit. Big Sur doesn't support my iMac, so I'm stuck with Catalina for good.
Good news is that I was able to build 3.0.0. The culprit appeared to be that I'm using the GNU coreutils and related packages (ie. gmake instead of make) installed from Homebrew instead of the usual binaries that come included with macOS. When I unlinked them and used the macOS binaries I was able to build without issue.
For what it's worth, though, I've never ran into this issue with previous Ruby releases.
This is still failing for me on Big Sur with 3.0.2. I have made sure to uninstall gmake and coreutils from MacPorts but it is still failing. If I revert commit I mentioned in the original report then it builds fine on Big Sur under all conditions, with or without GNU coreutils.