Build an optimized OpenSCAD locally on MacOS X (checkout parallel fork)

README.md

mkdir build
( cd build && cmake .. -DCMAKE_BUILD_TYPE=Release -DEXPERIMENTAL=1 )
( cd build && time make -j12 )
( cd build/tests && time ctest -j12 -E 'edges_view-options-tests|nef3_broken' )
( cd build/tests && time ctest -j12 -R 'fastcsg.*' )

mkdir build_same_kernel
( cd build_same_kernel && cmake .. -DCMAKE_BUILD_TYPE=Release -DEXPERIMENTAL=1 -DFAST_CSG_SAME_KERNEL=1 )
( cd build_same_kernel && time make -j12 )
( cd build_same_kernel/tests && time ctest -j12 -E 'edges_view-options-tests|nef3_broken' )
( cd build/tests && time ctest -j12 -R 'fastcsg.*' )

build_openscad.sh

#!/bin/bash
#
# Trivial to adapt to Linux (just check your compiler settings if not using clang)
# 
# TODO: test removing the `add_definitions(-DEIGEN_DONT_ALIGN)` from CMakeLists.txt, at least if(APPLE)

# Stock OpenSCAD
# git clone https://github.com/openscad/openscad

# Fork with some parallelism and extra lazy features
# See changes: https://github.com/openscad/openscad/compare/master...ochafik:faster-integ-1
git clone https://github.com/ochafik/openscad
git checkout faster-integ-1

./scripts/macosx-build-homebrew.sh
cd openscad
rm -fR objects .qmake.cache
# See https://clang.llvm.org/docs/ThinLTO.html
# and https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
export qmake_args=(
  CONFIG+=experimental
  CONFIG+=snapshot
  CONFIG+=info
  
  CONFIG-=debug
  CONFIG+=optimize_full
  QMAKE_CXXFLAGS+=-march=native
  QMAKE_CXXFLAGS+=-flto=full
  QMAKE_LFLAGS+=-flto=full
  #QMAKE_CXXFLAGS+=-ffast-math
  #QMAKE_CXXFLAGS+=-DCGAL_NEF3_INTERSECTION_BY_KDTREE
)
qmake openscad.pro "${qmake_args[@]}"
make clean && make -j12

time ./OpenSCAD.app/Contents/MacOS/OpenSCAD \
   --enable=lazy-union \
   --enable=lazy-module \
   --enable=flatten-children \
   --enable=push-transforms \
   --enable=difference-union \
   --enable=parallelize \
   -o output.stl Benchy.scad