build: use linker specified by the LD env variable

Modifed scripts/detect_cc.sh to take additional parameter specifing
the linker to use. Default to LLD on FreeBSD systems.

Change-Id: Idf97e9676a144028c0803d272ae6f0e903b0dd1f
Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-on: https://review.gerrithub.io/c/438801
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

Makefile

@@ -78,7 +78,7 @@ pkgdep:
 $(DIRS-y): mk/cc.mk include/spdk/config.h
 
 mk/cc.mk:
-	$(Q)scripts/detect_cc.sh --cc=$(CC) --cxx=$(CXX) --lto=$(CONFIG_LTO) > $@.tmp; \
+	$(Q)scripts/detect_cc.sh --cc=$(CC) --cxx=$(CXX) --lto=$(CONFIG_LTO) --ld=$(LD) > $@.tmp; \
 	cmp -s $@.tmp $@ || mv $@.tmp $@ ; \
 	rm -f $@.tmp
 

mk/spdk.common.mk

@@ -112,9 +112,16 @@ LDFLAGS += -Wl,-z,relro,-z,now
 # This is the default in most environments, but it doesn't hurt to set it explicitly.
 LDFLAGS += -Wl,-z,noexecstack
 
+# Specify the linker to use
+LDFLAGS += -fuse-ld=$(LD_TYPE)
+
 ifeq ($(OS),FreeBSD)
 SYS_LIBS += -L/usr/local/lib
 COMMON_CFLAGS += -I/usr/local/include
+# Default to lld on FreeBSD
+ifeq ($(origin LD),default)
+LD = ld.lld
+endif
 endif
 
 # Attach only if PMDK lib specified with configure

scripts/detect_cc.sh

@@ -19,12 +19,13 @@ function usage()
 	err " -h, --help                Display this help and exit"
 	err " --cc=path                 C compiler to use"
 	err " --cxx=path                C++ compiler to use"
+	err " --ld=path                 Linker to use"
 	err " --lto=[y|n]               Attempt to configure for LTO"
-
 }
 
 CC=cc
 CXX=c++
+LD=ld
 LTO=n
 
 for i in "$@"; do
@@ -42,6 +43,9 @@ for i in "$@"; do
 		--lto=*)
 			LTO="${i#*=}"
 			;;
+		--ld=*)
+			LD="${i#*=}"
+			;;
 		--)
 			break
 			;;
@@ -54,13 +58,27 @@ done
 
 CC_TYPE=$($CC -v 2>&1 | grep -o -E '\w+ version' | head -1 | awk '{ print $1 }')
 CXX_TYPE=$($CXX -v 2>&1 | grep -o -E '\w+ version' | head -1 | awk '{ print $1 }')
-LD_TYPE=$(ld -v 2>&1 | awk '{print $2}')
-
 if [ "$CC_TYPE" != "$CXX_TYPE" ]; then
 	err "C compiler is $CC_TYPE but C++ compiler is $CXX_TYPE"
 	err "This may result in errors"
 fi
 
+LD_TYPE=$($LD --version 2>&1 | head -n1 | awk '{print $1, $2}')
+case "$LD_TYPE" in
+	"GNU ld"*)
+		LD_TYPE=bfd
+		;;
+	"GNU gold"*)
+		LD_TYPE=gold
+		;;
+	"LLD"*)
+		LD_TYPE=lld
+		;;
+	*)
+		err "Unsupported linker: $LD"
+		exit 1
+esac
+
 CCAR="ar"
 if [ "$LTO" = "y" ]; then
 	if [ "$CC_TYPE" = "clang" ]; then
@@ -74,7 +92,17 @@ if [ "$LTO" = "y" ]; then
 	fi
 fi
 
-echo "CC?=$CC"
-echo "CXX?=$CXX"
+function set_default() {
+	echo "ifeq (\$(origin $1),default)"
+	echo "$1 = $2"
+	echo "endif"
+	echo ""
+}
+
+set_default CC $CC
+set_default CXX $CXX
+set_default LD $LD
+
 echo "CCAR=$CCAR"
 echo "CC_TYPE=$CC_TYPE"
+echo "LD_TYPE=$LD_TYPE"

test/unit/lib/bdev/mt/bdev.c/Makefile

@@ -33,7 +33,6 @@
 
 SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../../../../..)
 include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
-include $(SPDK_ROOT_DIR)/mk/spdk.mock.unittest.mk
 
 TEST_FILE = bdev_ut.c
 

test/unit/lib/blob/blob.c/Makefile

@@ -33,7 +33,6 @@
 
 SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../../../..)
 include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
-include $(SPDK_ROOT_DIR)/mk/spdk.mock.unittest.mk
 
 TEST_FILE = blob_ut.c
 

test/unit/lib/event/app.c/Makefile

@@ -33,7 +33,6 @@
 
 SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../../../..)
 include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
-include $(SPDK_ROOT_DIR)/mk/spdk.mock.unittest.mk
 
 SPDK_LIB_LIST = conf trace jsonrpc json
 TEST_FILE = app_ut.c

test/unit/lib/reduce/reduce.c/Makefile

@@ -33,7 +33,6 @@
 
 SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../../../..)
 include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
-include $(SPDK_ROOT_DIR)/mk/spdk.mock.unittest.mk
 
 TEST_FILE = reduce_ut.c
 

test/unit/lib/thread/thread.c/Makefile

@@ -33,7 +33,6 @@
 
 SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../../../..)
 include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
-include $(SPDK_ROOT_DIR)/mk/spdk.mock.unittest.mk
 
 TEST_FILE = thread_ut.c