Always use the otool that came with cctools 65. Check with which otool . If you have multiple installations, reorder PATH. Issue 2: Linker fails with "too many open files" Cause: The new LTO engine opens many temporary file descriptors.
clang -o MyGame main.o physics.o render.o -Wl,-dead_strip_dylibs -Wl,-merge_zero_fill_sections Security researchers often need to modify existing Mach-O binaries. Using install_name_tool from cctools 65, you can redirect library dependencies:
git clone https://github.com/apple-oss-distributions/cctools cd cctools git checkout cctools-65 make configure ./configure --prefix=/opt/cctools65 make && make install 1. Reducing App Binary Size A game development studio reported reducing their iOS app size from 187 MB to 152 MB simply by using ld64 from cctools 65 with -dead_strip_dylibs and -merge_zero_fill_sections . These linker flags aggressively remove unused code and compress zero-filled data segments.
