build-sys: add silent rule for m4 processing

Using custom prefixes makes the whole build process a bit more
readable.

diff --git a/Makefile.am b/Makefile.am
index cd4d879ce7fea5b1ac9b3cc9d3fd78e413ada624..abc3d55438d3b65c32cd8ee132667e06ccdcaf3c 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -246,6 +246,12 @@ INSTALL_EXEC_HOOKS += \
        install-directories-hook \
        install-aliases-hook
 
+# ------------------------------------------------------------------------------
+
+AM_V_M4 = $(AM_V_M4_$(V))
+AM_V_M4_ = $(AM_V_M4_$(AM_DEFAULT_VERBOSITY))
+AM_V_M4_0 = @echo "  M4      " $@;
+
 # ------------------------------------------------------------------------------
 rootbin_PROGRAMS = \
        systemctl \
@@ -3863,14 +3869,14 @@ src/%.c: src/%.gperf
 
 src/%: src/%.m4
        $(AM_V_at)$(MKDIR_P) $(dir $@)
-       $(AM_V_GEN)$(M4) -P $(M4_DEFINES) < $< > $@
+       $(AM_V_M4)$(M4) -P $(M4_DEFINES) < $< > $@
 
 M4_PROCESS_SYSTEM = \
-       $(AM_V_GEN)$(MKDIR_P) $(dir $@) && \
+       $(AM_V_M4)$(MKDIR_P) $(dir $@) && \
        $(M4) -P $(M4_DEFINES) -DFOR_SYSTEM=1 < $< > $@
 
 M4_PROCESS_USER = \
-       $(AM_V_GEN)$(MKDIR_P) $(dir $@) && \
+       $(AM_V_M4)$(MKDIR_P) $(dir $@) && \
        $(M4) -P $(M4_DEFINES) -DFOR_USER=1 < $< > $@
 
 units/%: units/%.m4 Makefile