CRYSTAL-SPEC(1) Crystal Compiler Command Line Reference Guide CRYSTAL-SPEC(1) (NAME) crystal-spec - (spec) (SYNOPSIS) crystal spec [] [] (OPTIONS) -d, --debug (debug symbols). lldb gdb valgrind . --no-debug . -D FLAG, --define FLAG . (types) . (target triple) --target-triple ( ) . --error-trace (error trace). -O LEVEL : 0 () 1 2 3. (OPTIMIZATIONS) . --release (release). -O3 --single-module -s, --stats . . -p, --progress . -t, --time . --no-color . crystal 1.21.0 2026-07-23 CRYSTAL-SPEC(1)