+ dnl
+ dnl Some versions of SWIG (like 3.0.12) generate code that produces
+ dnl -Wcast-function-type warnings. This warning is present in gcc >= 8. This
+ dnl combo happens on RHEL/Centos 8, for example. Later versions of SWIG (like
+ dnl 4.0.1) have the correct function signatures to not produce this warning.
+ dnl It's simpler to just disable the warning globally.
+ dnl
+ dnl Note that the Debian/Ubuntu SWIG package 3.0.12-2 contains a local patch to
+ dnl fix this (python-fix-function-cast-warnings.patch), so you won't be able to
+ dnl reproduce the warning using that package.
+ dnl
+ dnl Ref: https://github.com/swig/swig/issues/1259
+ -Wno-cast-function-type dnl
+ -Wno-suggest-attribute=format dnl