More Makefile definitions for targeting emscripten (JuliaLang#32482)

Make.inc

@@ -335,6 +335,9 @@ OPENBLAS_DYNAMIC_ARCH := 1
 override CROSS_COMPILE:=$(XC_HOST)-
 ifneq (,$(findstring mingw,$(XC_HOST)))
 override OS := WINNT
+else ifneq (,$(findstring emscripten,$(XC_HOST)))
+override OS := emscripten
+override CROSS_COMPILE:=
 else
 ifeq (,$(OS))
 $(error "unknown XC_HOST variable set, please set OS")
@@ -1049,7 +1052,7 @@ else
 endif
 
 # shared library runtime paths
-ifeq ($(OS), WINNT)
+ifneq (,$(filter $(OS),WINNT emscripten))
  RPATH :=
  RPATH_ORIGIN :=
  RPATH_ESCAPED_ORIGIN :=

Makefile

@@ -147,7 +147,7 @@ $(build_depsbindir)/stringreplace: $(JULIAHOME)/contrib/stringreplace.c | $(buil
  @$(call PRINT_CC, $(HOSTCC) -o $(build_depsbindir)/stringreplace $(JULIAHOME)/contrib/stringreplace.c)
 
 julia-base-cache: julia-sysimg-$(JULIA_BUILD_MODE) | $(DIRS) $(build_datarootdir)/julia
- @$(call spawn,$(JULIA_EXECUTABLE) --startup-file=no $(call cygpath_w,$(JULIAHOME)/etc/write_base_cache.jl) \
+ @$(call spawn,JULIA_BINDIR=$(call cygpath_w,$(build_bindir)) $(JULIA_EXECUTABLE) --startup-file=no $(call cygpath_w,$(JULIAHOME)/etc/write_base_cache.jl) \
  $(call cygpath_w,$(build_datarootdir)/julia/base.cache))
 
 # public libraries, that are installed in $(prefix)/lib

base/Makefile

@@ -110,7 +110,7 @@ else
 endif
 endif
 
-ifneq ($(OS), WINNT)
+ifeq (,$(filter $(OS), WINNT emscripten))
 # For any USE_SYSTEM_* libraries that will be dynamically loaded by libjulia,
 # put a symlink in the private libdir.
 # System package managers may want to install these links manually,

sysimage.mk

@@ -64,7 +64,7 @@ $(build_private_libdir)/corecompiler.ji: $(COMPILER_SRCS)
 
 $(build_private_libdir)/sys.ji: $(build_private_libdir)/corecompiler.ji $(JULIAHOME)/VERSION $(BASE_SRCS) $(STDLIB_SRCS)
  @$(call PRINT_JULIA, cd $(JULIAHOME)/base && \
- if ! $(call spawn,$(JULIA_EXECUTABLE)) -g1 -O0 -C "$(JULIA_CPU_TARGET)" --output-ji $(call cygpath_w,$@).tmp $(JULIA_SYSIMG_BUILD_FLAGS) \
+ if ! $(call spawn,JULIA_BINDIR=$(call cygpath_w,$(build_bindir)) $(JULIA_EXECUTABLE)) -g1 -O0 -C "$(JULIA_CPU_TARGET)" --output-ji $(call cygpath_w,$@).tmp $(JULIA_SYSIMG_BUILD_FLAGS) \
  --startup-file=no --warn-overwrite=yes --sysimage $(call cygpath_w,$<) sysimg.jl $(RELBUILDROOT); then \
  echo '*** This error might be fixed by running `make clean`. If the error persists$(COMMA) try `make cleanall`. ***'; \
  false; \
@@ -74,7 +74,7 @@ $(build_private_libdir)/sys.ji: $(build_private_libdir)/corecompiler.ji $(JULIAH
 define sysimg_builder
 $$(build_private_libdir)/sys$1-o.a $$(build_private_libdir)/sys$1-bc.a : $$(build_private_libdir)/sys$1-%.a : $$(build_private_libdir)/sys.ji
  @$$(call PRINT_JULIA, cd $$(JULIAHOME)/base && \
- if ! $$(call spawn,$3) $2 -C "$$(JULIA_CPU_TARGET)" --output-$$* $$(call cygpath_w,$$@).tmp $$(JULIA_SYSIMG_BUILD_FLAGS) \
+ if ! $$(call spawn,JULIA_BINDIR=$(call cygpath_w,$(build_bindir)) $3) $2 -C "$$(JULIA_CPU_TARGET)" --output-$$* $$(call cygpath_w,$$@).tmp $$(JULIA_SYSIMG_BUILD_FLAGS) \
  --startup-file=no --warn-overwrite=yes --sysimage $$(call cygpath_w,$$<) $$(call cygpath_w,$$(JULIAHOME)/contrib/generate_precompile.jl) $(JULIA_PRECOMPILE); then \
  echo '*** This error is usually fixed by running `make clean`. If the error persists$$(COMMA) try `make cleanall`. ***'; \
  false; \