Fix build-system: use xxx_LDADD instead of xxx_LDFLAGS

xxx_LDFLAGS place the libraries like '-lX11' or '-lXft' at the beginning of
the linker command. Some systems were not able to handle the situation and
this lead to a lot of unresolved symbols. Reading the documentation of
automake:

    ... you can use LDADD to do so. This variable is used to specify
    additional objects or libraries to link with; it is inappropriate for
    specifying specific linker flags, you should use AM_LDFLAGS for this
    purpose.

In addition we link against -lm in order to satisfy symbols refering to 'cos'
and 'sin'.

configure.ac

@@ -129,6 +129,10 @@ AC_CHECK_FUNCS([ \
 	vsnprintf \
 ])
 
+AC_CHECK_LIBM
+AC_SUBST(LIBM)
+LIBS="$LIBS $LIBM"
+
 dnl Windows requires the mingw-catgets library for the catgets function.
 AC_SEARCH_LIBS([catgets], [catgets], [], [])
 

src/Makemodule.am

@@ -25,6 +25,8 @@
 BUILT_SOURCES = src/defaults.hh src/defaults.cc
 CONFIG_CLEAN_FILES = src/defaults.hh src/defaults.cc
 
+LDADD = libFbTk.a src/defaults.$(OBJEXT)
+
 bin_PROGRAMS += fluxbox
 
 src/defaults.hh:
@@ -138,13 +140,13 @@ fluxbox_CPPFLAGS = \
 	-I$(fbtk_incdir) \
 	-I$(nls_incdir)
 
-fluxbox_LDFLAGS = \
+fluxbox_LDADD = \
+	$(LDADD) \
 	$(FONTCONFIG_LIBS) \
 	$(FREETYPE2_LIBS) \
 	$(FRIBIDI_LIBS) \
 	$(IMLIB2_LIBS) \
 	$(RANDR_LIBS) \
-	$(X11_LIBS) \
 	$(XEXT_LIBS) \
 	$(XFT_LIBS) \
 	$(XINERAMA_LIBS) \
@@ -152,7 +154,8 @@ fluxbox_LDFLAGS = \
 	$(XRENDER_LIBS) \
 	$(X_EXTRA_LIBS) \
 	$(X_LIBS) \
-	$(X_PRE_LIBS)
+	$(X_PRE_LIBS) \
+	$(X11_LIBS)
 
 fluxbox_SOURCES = \
 	src/AlphaMenu.cc \
@@ -272,4 +275,3 @@ fluxbox_SOURCES = \
 	${SLIT_SOURCE} \
 	${TOOLBAR_SOURCE}
 
-LDADD = libFbTk.a src/defaults.$(OBJEXT)

util/Makemodule.am

@@ -21,19 +21,19 @@ fbsetroot_SOURCES = \
 	util/fbsetroot.cc \
 	util/fbsetroot.hh
 fbsetroot_LDADD = \
-	libFbTk.a
+	libFbTk.a \
-fbsetroot_CPPFLAGS = \
-	$(AM_CPPFLAGS) \
-	-I$(fbtk_incdir) \
-	-I$(src_incdir) \
-	-I$(nls_incdir)
-fbsetroot_LDFLAGS = \
 	$(FONTCONFIG_LIBS) \
 	$(FRIBIDI_LIBS) \
 	$(X11_LIBS) \
 	$(XFT_LIBS) \
 	$(XRENDER_LIBS)
 
+fbsetroot_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(fbtk_incdir) \
+	-I$(src_incdir) \
+	-I$(nls_incdir)
+
 fluxbox_update_configs_SOURCES = \
 	src/defaults.cc \
 	src/Resources.cc \
@@ -44,8 +44,7 @@ fluxbox_update_configs_CPPFLAGS = \
 	-I$(src_incdir) \
 	-I$(nls_incdir)
 fluxbox_update_configs_LDADD = \
-	libFbTk.a
+	libFbTk.a \
-fluxbox_update_configs_LDFLAGS = \
 	$(FRIBIDI_LIBS) \
 	$(X11_LIBS)
 
@@ -54,5 +53,5 @@ fluxbox_remote_SOURCES = \
 fluxbox_remote_CPPFLAGS = \
 	$(AM_CPPFLAGS) \
 	-I$(fbtk_incdir)
-fluxbox_remote_LDFLAGS = \
+fluxbox_remote_LDADD = \
 	$(X11_LIBS)

util/fbrun/Makemodule.am

@@ -10,13 +10,12 @@ fbrun_SOURCES = \
 	util/fbrun/main.cc \
 	util/fbrun/fbrun.xpm
 
-fbrun_LDADD = libFbTk.a
+fbrun_LDADD = libFbTk.a \
-
-fbrun_LDFLAGS = \
-	$(FONTCONFIG_LIBS) \
 	$(FRIBIDI_LIBS) \
-	$(X11_LIBS) \
+	$(FONTCONFIG_LIBS) \
+    $(FREETYEP_LIBS) \
 	$(XFT_LIBS) \
 	$(XINERAMA_LIBS) \
 	$(XPM_LIBS) \
-	$(XRENDER_LIBS)
+	$(XRENDER_LIBS) \
+	$(X11_LIBS)