Add support for --disable-optimize

Author: graydon

Makefile.in

@@ -14,7 +14,11 @@ CFG_INFO := $(info cfg: building on $(CFG_OSTYPE) $(CFG_CPUTYPE))
 CFG_GCC_CFLAGS := -fno-strict-aliasing
 CFG_GCC_LINK_FLAGS :=
 CFG_BOOT_FLAGS := $(BOOT_FLAGS)
-CFG_RUSTC_FLAGS := -nowarn -O
+ifdef CFG_DISABLE_OPTIMIZE
+  CFG_RUSTC_FLAGS := -O
+else
+  CFG_RUSTC_FLAGS := -nowarn -O
+endif
 
 # On Darwin, we need to run dsymutil so the debugging information ends
 # up in the right place.  On other platforms, it automatically gets

configure

@@ -153,6 +153,7 @@ fi
 
 opt valgrind 1 "run tests with valgrind"
 opt docs     1 "build documentation"
+opt optimize 1 "build optimized rust code"
 
 
 if [ $HELP -eq 1 ]