build: Add support for linking against a system libjemalloc

Add a new USE_SYSTEM_JEMALLOC make variable to select whether to link
against the system libjemalloc.

deps/Makefile

@@ -37,7 +37,9 @@ distclean:
 	-(cd hiredis && $(MAKE) clean) > /dev/null || true
 	-(cd linenoise && $(MAKE) clean) > /dev/null || true
 	-(cd lua && $(MAKE) clean) > /dev/null || true
+ifneq ($(USE_SYSTEM_JEMALLOC),yes)
 	-(cd jemalloc && [ -f Makefile ] && $(MAKE) distclean) > /dev/null || true
+endif
 	-(cd rocksdb && $(MAKE) clean) > /dev/null || true
 	-(cd hdr_histogram && $(MAKE) clean) > /dev/null || true
 	-(rm -f .make-*)

pkg/deb/debian_dh9/patches/series

@@ -2,7 +2,6 @@
 #debian-packaging/0003-dpkg-buildflags.patch
 #debian-packaging/0007-Set-Debian-configuration-defaults.patch
 #0010-Use-get_current_dir_name-over-PATHMAX-etc.patch
-#0010-Add-support-for-USE_SYSTEM_JEMALLOC-flag.patch
 #0011-Add-support-for-a-USE_SYSTEM_LUA-flag.patch
 #0007-Add-support-for-a-USE_SYSTEM_HIREDIS-flag.patch
 #test

src/Makefile

@@ -317,11 +317,17 @@ ifeq ($(MALLOC),tcmalloc_minimal)
 endif
 
 ifeq ($(MALLOC),jemalloc)
+ifeq ($(USE_SYSTEM_JEMALLOC),yes)
+	FINAL_CFLAGS+= -DUSE_JEMALLOC $(shell $(PKG_CONFIG) --cflags jemalloc)
+	FINAL_CXXFLAGS+= -DUSE_JEMALLOC $(shell $(PKG_CONFIG) --cflags jemalloc)
+	FINAL_LIBS := $(shell $(PKG_CONFIG) --libs jemalloc) $(FINAL_LIBS)
+else
 	DEPENDENCY_TARGETS+= jemalloc
 	FINAL_CFLAGS+= -DUSE_JEMALLOC -I../deps/jemalloc/include
 	FINAL_CXXFLAGS+= -DUSE_JEMALLOC -I../deps/jemalloc/include
 	FINAL_LIBS := ../deps/jemalloc/lib/libjemalloc.a $(FINAL_LIBS)
 endif
+endif
 
 ifeq ($(MALLOC),memkind)
 	DEPENDENCY_TARGETS+= memkind
@@ -422,6 +428,7 @@ persist-settings: distclean
 	echo OPT=$(OPT) >> .make-settings
 	echo USE_SYSTEM_CONCURRENTQUEUE=$(USE_SYSTEM_CONCURRENTQUEUE) >> .make-settings
 	echo MALLOC=$(MALLOC) >> .make-settings
+	echo USE_SYSTEM_JEMALLOC=$(USE_SYSTEM_JEMALLOC) >> .make-settings
 	echo BUILD_TLS=$(BUILD_TLS) >> .make-settings
 	echo USE_SYSTEMD=$(USE_SYSTEMD) >> .make-settings
 	echo CFLAGS=$(CFLAGS) >> .make-settings