build: Terminate lists in variables with «# EOL»

This means we can add a trailing «\» to every element, so that they
can be removed without requiring modification of other lines, and can
be easily sorted.

Replace the old usage of $(nil) which could possibly end up with junk
added if such variable is ever defined, in the environment.

Makefile.am

@@ -1,13 +1,18 @@
 ## Process this file with automake to produce Makefile.in
 
-SUBDIRS = include man src test
+SUBDIRS = \
+	include \
+	man \
+	src \
+	test \
+	# EOL
 
 ACLOCAL_AMFLAGS = -I m4
 
 EXTRA_DIST = \
 	autogen \
 	get-version \
-	$(nil)
+	# EOL
 
 dist-hook:
 	echo $(VERSION) >$(distdir)/.dist-version

include/Makefile.am

@@ -29,4 +29,4 @@ nobase_include_HEADERS = \
 	bsd/unistd.h \
 	bsd/vis.h \
 	bsd/wchar.h \
-	$(nil)
+	# EOL

man/Makefile.am

@@ -2,11 +2,11 @@
 
 EXTRA_DIST = \
 	mdX.3bsd \
-	$(nil)
+	# EOL
 
 CLEANFILES = \
 	md5.3bsd \
-	$(nil)
+	# EOL
 
 SED_MD5_SUBST = -e 's/mdX/md5/g' -e 's/mdY/md4/g' -e 's/MDX/MD5/g'
 
@@ -251,4 +251,4 @@ dist_man_MANS = \
 	vis.3bsd \
 	wcslcat.3bsd \
 	wcslcpy.3bsd \
-	$(nil)
+	# EOL

src/Makefile.am

@@ -5,13 +5,14 @@ AM_CPPFLAGS = \
 	-isystem $(top_srcdir)/include/bsd/ \
 	-include $(top_builddir)/config.h \
 	-DLIBBSD_OVERLAY -DLIBBSD_DISABLE_DEPRECATED \
-	-D__REENTRANT
+	-D__REENTRANT \
+	# EOL
 
 if OS_WINDOWS
 AM_CPPFLAGS += \
 	-D_CRT_SECURE_NO_WARNINGS \
 	-D_CRT_NONSTDC_NO_WARNINGS \
-	$(nil)
+	# EOL
 endif
 
 libbsd_la_included_sources = \
@@ -23,7 +24,7 @@ libbsd_la_included_sources = \
 	getentropy_osx.c \
 	getentropy_solaris.c \
 	getentropy_win.c \
-	$(nil)
+	# EOL
 
 CLEANFILES =
 EXTRA_DIST = \
@@ -32,13 +33,13 @@ EXTRA_DIST = \
 	libbsd-ctor.pc.in \
 	libbsd-overlay.pc.in \
 	$(libbsd_la_included_sources) \
-	$(nil)
+	# EOL
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = \
 	libbsd.pc \
 	libbsd-overlay.pc \
-	$(nil)
+	# EOL
 
 lib_LTLIBRARIES = libbsd.la
 lib_LIBRARIES =
@@ -51,16 +52,19 @@ endif
 
 libbsd_la_DEPENDENCIES = \
 	$(libbsd_la_included_sources) \
-	libbsd.map
+	libbsd.map \
+	# EOL
 libbsd_la_LIBADD = \
 	$(MD5_LIBS) \
 	$(LIBBSD_LIBS) \
-	$(nil)
+	# EOL
 libbsd_la_LDFLAGS = \
-	-version-number $(LIBBSD_ABI)
+	-version-number $(LIBBSD_ABI) \
+	# EOL
 if HAVE_LINKER_VERSION_SCRIPT
 libbsd_la_LDFLAGS += \
-	-Wl,--version-script=$(srcdir)/libbsd.map
+	-Wl,--version-script=$(srcdir)/libbsd.map \
+	# EOL
 endif
 libbsd_la_SOURCES = \
 	arc4random.c \
@@ -117,12 +121,12 @@ libbsd_la_SOURCES = \
 	vis.c \
 	wcslcat.c \
 	wcslcpy.c \
-	$(nil)
+	# EOL
 
 if !HAVE_GETENTROPY
 libbsd_la_SOURCES += \
 	getentropy.c \
-	$(nil)
+	# EOL
 endif
 
 if NEED_TRANSPARENT_LIBMD
@@ -133,7 +137,7 @@ endif
 
 libbsd_ctor_a_SOURCES = \
 	setproctitle_ctor.c \
-	$(nil)
+	# EOL
 
 if NEED_TRANSPARENT_LIBMD
 TRANSPARENT_LIBMD_DEPENDS = format.ld

test/Makefile.am

@@ -4,30 +4,32 @@ HEADERS_CPPFLAGS = \
 	-I$(top_builddir) \
 	-include $(top_builddir)/config.h \
 	-DLIBBSD_DISABLE_DEPRECATED \
-	-D__REENTRANT
+	-D__REENTRANT \
+	# EOL
 
 AM_CPPFLAGS = \
 	-isystem $(top_srcdir)/include/bsd/ \
 	$(HEADERS_CPPFLAGS) \
-	-DLIBBSD_OVERLAY
+	-DLIBBSD_OVERLAY \
+	# EOL
 
 AM_TESTS_ENVIRONMENT = \
 	export CC="$(CC)"; \
 	export CPPFLAGS="$(HEADERS_CPPFLAGS)"; \
 	export top_srcdir="$(top_srcdir)"; \
-	$(nil)
+	# EOL
 
 LDADD = $(top_builddir)/src/libbsd.la
 
 EXTRA_DIST = \
 	headers-overlay.sh \
 	headers-system.sh \
-	$(nil)
+	# EOL
 
 check_SCRIPTS = \
 	headers-overlay.sh \
 	headers-system.sh \
-	$(nil)
+	# EOL
 
 check_PROGRAMS = \
 	overlay \
@@ -52,7 +54,7 @@ check_PROGRAMS = \
 	strtonum \
 	vis \
 	vis-openbsd \
-	$(nil)
+	# EOL
 
 if HAVE_LIBTESTU01
 arc4random_LDADD = $(LDADD) $(TESTU01_LIBS)
@@ -65,7 +67,7 @@ proctitle_LDFLAGS = \
 	-Wl,-u,libbsd_init_func \
 	$(top_builddir)/src/libbsd-ctor.a \
 	$(top_builddir)/src/libbsd.la \
-	$(nil)
+	# EOL
 
 check_PROGRAMS += proctitle
 endif