diff --git a/base/.gitignore b/base/.gitignore
index 49b6f3f2d7808..e572b8ea229d0 100644
--- a/base/.gitignore
+++ b/base/.gitignore
@@ -1,3 +1,4 @@
+/features_h.jl
 /pcre_h.jl
 /errno_h.jl
 /build_h.jl
diff --git a/base/Makefile b/base/Makefile
index b3845753fe74c..9ba9ee4be2a78 100644
--- a/base/Makefile
+++ b/base/Makefile
@@ -12,7 +12,7 @@ else
 CPP_STDOUT := $(CPP) -E
 endif
 
-all: $(addprefix $(BUILDDIR)/,pcre_h.jl errno_h.jl build_h.jl.phony file_constants.jl uv_constants.jl version_git.jl.phony)
+all: $(addprefix $(BUILDDIR)/,pcre_h.jl errno_h.jl build_h.jl.phony features_h.jl file_constants.jl uv_constants.jl version_git.jl.phony)
 
 PCRE_CONST := 0x[0-9a-fA-F]+|[0-9]+|\([\-0-9]+\)
 ifeq ($(USE_SYSTEM_PCRE), 1)
@@ -21,6 +21,18 @@ else
   PCRE_INCL_PATH := $(build_includedir)/pcre2.h
 endif
 
+define parse_features
+@echo "# $(2) features" >> $@
+@$(call PRINT_PERL, cat ../src/features_$(1).h | perl -lne 'print "const JL_$(2)_$$1 = UInt32($$2)" if /^\s*JL_FEATURE_DEF(?:_NAME)?\(\s*(\w+)\s*,\s*([^,]+)\s*,.*\)\s*(?:\/\/.*)?$$/' >> $@)
+@echo >> $@
+endef
+
+$(BUILDDIR)/features_h.jl: ../src/features_x86.h ../src/features_aarch32.h ../src/features_aarch64.h
+	@-rm -f $@
+	@$(call parse_features,x86,X86)
+	@$(call parse_features,aarch32,AArch32)
+	@$(call parse_features,aarch64,AArch64)
+
 $(BUILDDIR)/pcre_h.jl: $(PCRE_INCL_PATH)
 	@$(call PRINT_PERL, $(CPP) -D PCRE2_CODE_UNIT_WIDTH=8 -dM $< | perl -nle '/^\s*#define\s+PCRE2_(\w*)\s*\(?($(PCRE_CONST))\)?u?\s*$$/ and print index($$1, "ERROR_") == 0 ? "const $$1 = Cint($$2)" : "const $$1 = UInt32($$2)"' | LC_ALL=C sort > $@)
 
@@ -236,6 +248,7 @@ clean:
 	-rm -f $(BUILDDIR)/errno_h.jl
 	-rm -f $(BUILDDIR)/build_h.jl
 	-rm -f $(BUILDDIR)/build_h.jl.phony
+	-rm -f $(BUILDDIR)/features_h.jl
 	-rm -f $(BUILDDIR)/uv_constants.jl
 	-rm -f $(BUILDDIR)/file_constants.jl
 	-rm -f $(BUILDDIR)/version_git.jl
diff --git a/src/processor.h b/src/processor.h
index 114e46912c2a9..6c95a0b6003b6 100644
--- a/src/processor.h
+++ b/src/processor.h
@@ -123,7 +123,7 @@ typedef enum {
 } jl_cpu_feature_t;
 #undef JL_FEATURE_DEF_NAME
 
-int jl_test_cpu_feature(jl_cpu_feature_t feature);
+JL_DLLEXPORT int jl_test_cpu_feature(jl_cpu_feature_t feature);
 
 static const uint32_t jl_sysimg_tag_mask = 0x80000000u;
 static const uint32_t jl_sysimg_val_mask = ~((uint32_t)0x80000000u);