Add build_rpm script and rpm spec (#1831)

Also, link stdlib++ and libgcc statically.

Signed-off-by: Roman Gershman <roman@dragonflydb.io>

Makefile

@@ -2,18 +2,30 @@ BUILD_ARCH := $(shell uname -m)
 RELEASE_NAME := "dragonfly-${BUILD_ARCH}"
 
 HELIO_RELEASE := $(if $(HELIO_RELEASE),y,)
-HELIO_RELEASE_FLAGS = -DHELIO_RELEASE_FLAGS="-flto -g1 -gz"
+
+HELIO_RELEASE_FLAGS = -DHELIO_RELEASE_FLAGS="-g1 -gz"
 HELIO_USE_STATIC_LIBS = ON
 HELIO_OPENSSL_USE_STATIC_LIBS = ON
 HELIO_ENABLE_GIT_VERSION = ON
 HELIO_WITH_UNWIND = OFF
 
+# Some distributions (old fedora) have incorrect dependencies for crypto
+# so we add -lz for them.
+LINKER_FLAGS=-lz
+
 # 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
 
+# For release builds we link statically libstdc++ and libgcc. Currently,
+# all the release builds are performed by gcc.
+ifeq ($(HELIO_RELEASE),y)
+	LINKER_FLAGS += -static-libstdc++ -static-libgcc
+endif
+
 HELIO_FLAGS = $(if $(HELIO_RELEASE),-release $(HELIO_RELEASE_FLAGS),) \
+			  -DCMAKE_EXE_LINKER_FLAGS="$(LINKER_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) \
@@ -26,13 +38,11 @@ configure:
 
 build:
 	cd build-opt; \
-	ninja dragonfly; \
-	ldd dragonfly
+	ninja dragonfly && ldd dragonfly
 
 build-debug:
 	cd build-dbg; \
-	ninja dragonfly; \
-	ldd dragonfly
+	ninja dragonfly && ldd dragonfly
 
 package:
 	cd build-opt; \