build: extract libping_core as noinst library

src/ping/Makefile.am

@@ -1,4 +1,5 @@
 bin_PROGRAMS = ft_ping
+noinst_LTLIBRARIES = libping_core.la
 
 PING_VERSION = 0.0.1
 VERSION_HEADER = $(top_srcdir)/includes/version_gen.h
@@ -40,8 +41,7 @@ $(VERSION_HEADER): FORCE
 FORCE:
 .PHONY: FORCE
 
-ft_ping_SOURCES = \
-	main.c \
+libping_core_la_SOURCES = \
 	cli/parse.c \
 	cli/handlers/handle_count.c \
 	cli/handlers/handle_dont_fragment.c \
@@ -81,12 +81,6 @@ ft_ping_SOURCES = \
 	stats/stats_init.c \
 	stats/stats_update.c
 
-ft_ping_CPPFLAGS = \
-	-I $(top_srcdir)/includes \
-	-I $(top_srcdir)/libicmp/includes \
-	-I $(top_srcdir)/libcli/include \
-	-D_GNU_SOURCE
-
 BASE_CFLAGS = -std=c99 $(STRICT_CFLAGS)
 
 if ENABLE_DEBUG
@@ -101,13 +95,27 @@ else
 SANITIZER_FLAGS =
 endif
 
-ft_ping_CFLAGS = $(BASE_CFLAGS) $(EXTRA_CFLAGS) $(SANITIZER_FLAGS)
+PING_CPPFLAGS = \
+	-I $(top_srcdir)/includes \
+	-I $(top_srcdir)/libicmp/includes \
+	-I $(top_srcdir)/libcli/include \
+	-D_GNU_SOURCE
+
+PING_CFLAGS = $(BASE_CFLAGS) $(EXTRA_CFLAGS) $(SANITIZER_FLAGS)
+
+libping_core_la_CPPFLAGS = $(PING_CPPFLAGS)
+libping_core_la_CFLAGS   = $(PING_CFLAGS)
+
+ft_ping_SOURCES  = main.c
+ft_ping_CPPFLAGS = $(PING_CPPFLAGS)
+ft_ping_CFLAGS   = $(PING_CFLAGS)
 ft_ping_LDFLAGS  = $(SANITIZER_FLAGS)
 ft_ping_LDADD    = \
+	libping_core.la \
 	$(top_srcdir)/libicmp/libicmp.a \
 	$(top_builddir)/libcli/src/libcli.la \
 	-lm
 
 # Build libicmp (simple Makefile) before linking
-$(top_srcdir)/libicmp/libicmp.a:
+$(top_srcdir)/libicmp/libicmp.a: FORCE
 	$(MAKE) -C $(top_srcdir)/libicmp BUILD_STATIC=yes BUILD_SHARED=no