distutils-r1.eclass: Skip build_ext when there no .c/.pyx files

Skip issuing build_ext when there appears to be no .c/.pyx files. Since starting setuptools is expensive, this gives a major speedup to building pure Python packages. If the check misfires, the worst that can happen is that C extensions will be built serialized. Signed-off-by: Michał Górny <[email protected]>
johu · Apr 11, 2022 · 4986eb8 · 4986eb8
1 parent ac1735e
commit 4986eb8
Showing 1 changed file with 11 additions and 1 deletion.
diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
@@ -1133,7 +1133,17 @@ distutils-r1_python_compile() {
  fi
 
  if [[ ${DISTUTILS_USE_PEP517} && ${GPEP517_TESTING} ]]; then
- esetup.py build_ext -j "${jobs}" "${@}"
+ # issue build_ext only if it looks like we have something
+ # to build; setuptools is expensive to start
+ # see extension.py for list of suffixes
+ # .pyx is added for Cython
+ if [[ -n $(
+ find '(' -name '*.c' -o -name '*.cc' -o -name '*.cpp' \
+ -o -name '*.cxx' -o -name '*.c++' -o -name '*.m' \
+ -o -name '*.mm' -o -name '*.pyx' ')' -print -quit
+ ) ]]; then
+ esetup.py build_ext -j "${jobs}" "${@}"
+ fi
  else
  esetup.py build -j "${jobs}" "${@}"
  fi