makefiles: deduplicate main target name into new SO var

Put the main target name into a new SO variable, put SO into a new
TARGET variable, make "all" depend on `$(TARGET)` and replace every
other occurrence of the main target name with `$(SO)`.

On the makefiles that build shared objects, to make them more similar.
With this commit, all of their targets are identical.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/libtrace/Makefile b/src/libtrace/Makefile
index 4e826b1aa..cb2d66667 100644
--- a/src/libtrace/Makefile
+++ b/src/libtrace/Makefile
@@ -1,6 +1,9 @@
 ROOT = ../..
 -include $(ROOT)/config.mk
 
+SO = libtrace.so
+TARGET = $(SO)
+
 HDRS := $(sort $(wildcard *.h)) $(MOD_HDRS)
 SRCS := $(sort $(wildcard *.c)) $(MOD_SRCS)
 OBJS := $(SRCS:.c=.o) $(MOD_OBJS)
@@ -8,16 +11,16 @@ CFLAGS += -ggdb $(HAVE_FATAL_WARNINGS) -O2 -DVERSION='"$(VERSION)"' -fstack-prot
 LDFLAGS += -pie -fPIE -Wl,-z,relro -Wl,-z,now
 
 .PHONY: all
-all: libtrace.so
+all: $(TARGET)
 
 %.o : %.c $(HDRS) $(ROOT)/config.mk
         $(CC) $(CFLAGS) $(INCLUDE) -c $< -o $@
 
-libtrace.so: $(OBJS) $(ROOT)/config.mk
+$(SO): $(OBJS) $(ROOT)/config.mk
         $(CC) $(LDFLAGS) -shared -fPIC -z relro -o $@ $(OBJS) -ldl
 
 .PHONY: clean
-clean:; rm -fr $(OBJS) libtrace.so *.plist
+clean:; rm -fr $(OBJS) $(SO) *.plist
 
 .PHONY: distclean
 distclean: clean