Restore building sys.dll on Windows, but switch default value

for --precompiled option to only load it if explicitly requested
since backtraces are still a problem with llvm 3.3

Make.inc

@@ -384,12 +384,7 @@ endif
 
 
 # if not absolute, then relative to the directory of the julia executable
-# on windows, use .ji by default
-ifeq ($(OS),WINNT)
-JCPPFLAGS += "-DJL_SYSTEM_IMAGE_PATH=\"$(build_private_libdir_rel)/sys.ji\""
-else
 JCPPFLAGS += "-DJL_SYSTEM_IMAGE_PATH=\"$(build_private_libdir_rel)/sys.$(SHLIB_EXT)\""
-endif
 
 # On Windows, we want shared library files to end up in $(build_bindir), instead of $(build_libdir)
 ifeq ($(OS),WINNT)

Makefile

@@ -182,11 +182,6 @@ $(build_private_libdir)/inference.o: $(build_private_libdir)/inference0.$(SHLIB_
  $(call spawn,$(JULIA_EXECUTABLE)) -C $(JULIA_CPU_TARGET) --output-o $(call cygpath_w,$(build_private_libdir)/inference.o) -f \
  -J $(call cygpath_w,$(build_private_libdir)/inference0.$(SHLIB_EXT)) coreimg.jl)
 
-# on windows, also generate a .ji file so we can delete the .dll
-ifeq ($(OS),WINNT)
-JULIA_SYSIMG_BUILD_FLAGS += --output-ji $(call cygpath_w,$(build_private_libdir)/sys.ji)
-endif
-
 COMMA:=,
 $(build_private_libdir)/sys.o: VERSION $(BASE_SRCS) $(build_docdir)/helpdb.jl $(build_private_libdir)/inference.$(SHLIB_EXT)
  @$(call PRINT_JULIA, cd base && \
@@ -363,15 +358,9 @@ else ifeq ($(OS), Linux)
 endif
 
  # Overwrite JL_SYSTEM_IMAGE_PATH in julia library
-ifeq ($(OS),WINNT)
- for julia in $(DESTDIR)$(private_libdir)/libjulia*.$(SHLIB_EXT) ; do \
- $(call spawn,$(build_bindir)/stringreplace $$(strings -t x - $$julia | grep "sys.ji$$" | awk '{print $$1;}' ) "$(private_libdir_rel)/sys.ji" 256 $(call cygpath_w,$$julia)); \
- done
-else
  for julia in $(DESTDIR)$(private_libdir)/libjulia*.$(SHLIB_EXT) ; do \
  $(call spawn,$(build_bindir)/stringreplace $$(strings -t x - $$julia | grep "sys.$(SHLIB_EXT)$$" | awk '{print $$1;}' ) "$(private_libdir_rel)/sys.$(SHLIB_EXT)" 256 $(call cygpath_w,$$julia)); \
  done
-endif
 endif
 
  mkdir -p $(DESTDIR)$(sysconfdir)
@@ -417,9 +406,6 @@ ifeq ($(JULIA_CPU_TARGET), native)
 endif
 
 ifeq ($(OS), WINNT)
- # If we are running on windows, also delete sys.dll until we switch to llvm3.5+
- -rm -f $(DESTDIR)$(private_libdir)/sys.$(SHLIB_EXT)
-
  [ ! -d dist-extras ] || ( cd dist-extras && \
  cp 7z.exe 7z.dll libexpat-1.dll zlib1.dll libgfortran-3.dll libquadmath-0.dll libstdc++-6.dll libgcc_s_s*-1.dll libssp-0.dll $(bindir) && \
  mkdir $(DESTDIR)$(prefix)/Git && \

src/init.c

@@ -111,7 +111,12 @@ jl_options_t jl_options = { 0, // quiet
  JL_OPTIONS_FAST_MATH_DEFAULT,
  0, // worker
  JL_OPTIONS_HANDLE_SIGNALS_ON,
+#ifdef _OS_WINDOWS_
+// TODO remove this when using LLVM 3.5+
+ JL_OPTIONS_USE_PRECOMPILED_NO,
+#else
  JL_OPTIONS_USE_PRECOMPILED_YES,
+#endif
  NULL, // bindto
  NULL, // outputbc
  NULL, // outputo