fix: make Dragonfly compatible with older systems (#1755)

Change the Makefile to configure the compile to produce code
compatible with core2 architecture for x86_64 systems.
Plus specify precise CPU extensions that we use in the code.
Partly addresses #1519

Before the change we relied on default helio logic that configured
the build to run on sandybridge for x86_64.
This PR overrides x86_64 settings to much older core2 processor.

Also, we remove an unneeded cmake include.

Signed-off-by: Roman Gershman <[email protected]>

Author: romange

CMakeLists.txt

@@ -36,5 +36,3 @@ include_directories(helio)
 
 add_subdirectory(helio)
 add_subdirectory(src)
-
-include(cmake/Packing.cmake)

Makefile

@@ -8,11 +8,16 @@ HELIO_OPENSSL_USE_STATIC_LIBS = ON
 HELIO_ENABLE_GIT_VERSION = ON
 HELIO_WITH_UNWIND = OFF
 
+# equivalent to: if $(uname_m) == x86_64 || $(uname_m) == amd64
+ifneq (, $(filter $(BUILD_ARCH),x86_64 amd64))
+HELIO_MARCH_OPT := -march=core2 -msse4.1 -mpopcnt -mtune=skylake
+endif
+
 HELIO_FLAGS = $(if $(HELIO_RELEASE),-release $(HELIO_RELEASE_FLAGS),) \
               -DBoost_USE_STATIC_LIBS=$(HELIO_USE_STATIC_LIBS) \
               -DOPENSSL_USE_STATIC_LIBS=$(HELIO_OPENSSL_USE_STATIC_LIBS) \
               -DENABLE_GIT_VERSION=$(HELIO_ENABLE_GIT_VERSION) \
-              -DWITH_UNWIND=$(HELIO_WITH_UNWIND) \
+              -DWITH_UNWIND=$(HELIO_WITH_UNWIND) -DMARCH_OPT="$(HELIO_MARCH_OPT)"
 
 .PHONY: default