After updating to Catalina, I've installed the Xcode command line tools
version 11.4.1, and gfortran 8.2. When trying to build R, configure dies:
checking whether gfortran appends underscores to external names... yes
checking whether gfortran appends extra underscores to external
names... no
checking whether mixed C/Fortran code can be run... configure:
WARNING: cannot run mixed C/Fortran code
configure: error: Maybe check LDFLAGS for paths to Fortran libraries?
I don't have LDFLAGS set. I'm not certain I'm running the right
compilers (I might have old ones that have precedence on the path). Are
these the versions I should be seeing?
$ clang --version
Apple clang version 11.0.3 (clang-1103.0.32.59)
Target: x86_64-apple-darwin19.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
$ gfortran --version
GNU Fortran (GCC) 8.2.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
If those are the right versions, any other suggestions on how to fix the
configure problem?
Duncan Murdoch
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