project: banish need for C compiler

This patch gets rid of the thin veneer that we currently have around the three
executables.  This was done for historical reasons (circa 2003 Guile couldnʼt
deal with process signals and forks).  In fact these problems were fixed many
moons ago, and there is now no need for it.  The project becomes 100% Guile!

Many files are affected; interested coders should use the GIT repository to
understand the details of all the changes.

Makefile.am

@@ -21,40 +21,18 @@
 ## Programs.  ##
 ## ---------- ##
 
-bin_PROGRAMS = bin/mcron
+bin_SCRIPTS = bin/mcron
+noinst_SCRIPTS = 
 
 if MULTI_USER
-bin_PROGRAMS += bin/crontab
-sbin_PROGRAMS = bin/cron
+bin_SCRIPTS += bin/crontab
+sbin_SCRIPTS = bin/cron
 else
-noinst_PROGRAMS = bin/cron bin/crontab
+noinst_SCRIPTS += bin/cron bin/crontab
 endif
 
-AM_CPPFLAGS = \
-  -DPACKAGE_LOAD_PATH=\"$(guilesitedir)\" \
-  -DPACKAGE_LOAD_COMPILED_PATH=\"$(guilesitegodir)\" \
-  -D_GNU_SOURCE
-
-AM_CFLAGS = @GUILE_CFLAGS@
-LDADD = @GUILE_LIBS@ src/libmcron.a
-
-bin_mcron_SOURCES = src/mcron.c
-bin_mcron_DEPENDENCIES = $(compiled_modules) $(noinst_LIBRARIES)
-
-bin_cron_SOURCES = src/cron.c
-bin_cron_DEPENDENCIES = $(compiled_modules) $(noinst_LIBRARIES)
-
-bin_crontab_SOURCES = src/crontab.c
-bin_crontab_DEPENDENCIES = $(compiled_modules) $(noinst_LIBRARIES)
-
 # wrapper to be used in the build environment and for running tests.
-noinst_SCRIPTS = pre-inst-env
-
-# local library.
-noinst_LIBRARIES = src/libmcron.a
-src_libmcron_a_SOURCES = \
-  src/utils.c \
-  src/utils.h
+noinst_SCRIPTS += pre-inst-env
 
 ## --------------- ##
 ## Guile modules.  ##
@@ -97,7 +75,7 @@ compiled_modules = \
   $(pkgmodulego_DATA) \
   $(pkgscriptgo_DATA)
 
-CLEANFILES = $(compiled_modules)
+CLEANFILES = $(compiled_modules) bin/crontab bin/cron bin/mcron
 DISTCLEANFILES = src/mcron/config.scm
 
 # Unset 'GUILE_LOAD_COMPILED_PATH' altogether while compiling.  Otherwise, if
@@ -120,6 +98,24 @@ DISTCLEANFILES = src/mcron/config.scm
 	  --warn=format --warn=unbound-variable --warn=arity-mismatch \
 	  --target="$(host)" --output="$@" "$<" $(devnull_verbose)
 
+
+bin/% : src/%.in Makefile
+	-@sed	-e 's,%PREFIX%,${prefix},g'				\
+		-e 's,%modsrcdir%,${guilesitedir},g'			\
+		-e 's,%modbuilddir%,${guilesitegodir},g'		\
+		-e 's,%localstatedir%,${localstatedir},g'		\
+		-e 's,%pkglibdir%,${pkglibdir},g'			\
+		-e 's,%sysconfdir%,${sysconfdir},g'			\
+		-e 's,%localedir%,${localedir},g'			\
+		-e 's,%VERSION%,@VERSION@,g'				\
+		-e 's,%PACKAGE_BUGREPORT%,@PACKAGE_BUGREPORT@,g'	\
+		-e 's,%PACKAGE_NAME%,@PACKAGE_NAME@,g'			\
+		-e 's,%PACKAGE_URL%,@PACKAGE_URL@,g'			\
+		-e 's,%GUILE%,$(GUILE),g'				\
+	   $< > $@;
+	-@chmod a+x $@
+
+
 ## ------------ ##
 ## Test suite.  ##
 ## ------------ ##
@@ -161,25 +157,28 @@ EXTRA_DIST = \
 # Sed command for Transforming program names.
 transform_exe = s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/
 
-if MULTI_USER
 install-exec-hook:
-	tcrontab=`echo crontab$(EXEEXT) | sed '$(transform_exe)'`; \
+if MULTI_USER
+	tcrontab=`echo crontab | sed '$(transform_exe)'`; \
 	chmod u+s $(DESTDIR)$(bindir)/$${tcrontab}
+	tcron=`echo cron | sed '$(transform_exe)'`; \
+	chmod u+s $(DESTDIR)$(sbindir)/$${tcron}
 endif
+	tmcron=`echo mcron | sed '$(transform_exe)'`;
 
 installcheck-local:
 ## Check that only expected programs are installed and configured
-	tmcron=`echo mcron$(EXEEXT) | sed '$(transform_exe)'`; \
+	tmcron=`echo mcron | sed '$(transform_exe)'`; \
 	test -e $(DESTDIR)$(bindir)/$${tmcron}
 if MULTI_USER
-	tcrontab=`echo crontab$(EXEEXT) | sed '$(transform_exe)'`; \
+	tcrontab=`echo crontab | sed '$(transform_exe)'`; \
 	test -u $(DESTDIR)$(bindir)/$${tcrontab}
-	tcron=`echo cron$(EXEEXT) | sed '$(transform_exe)'`; \
+	tcron=`echo cron | sed '$(transform_exe)'`; \
 	test -e $(DESTDIR)$(sbindir)/$${tcron}
 else !MULTI_USER
-	tcrontab=`echo crontab$(EXEEXT) | sed '$(transform_exe)'`; \
+	tcrontab=`echo crontab | sed '$(transform_exe)'`; \
 	test ! -u $(DESTDIR)$(bindir)/$${tcrontab}
-	tcron=`echo cron$(EXEEXT) | sed '$(transform_exe)'`; \
+	tcron=`echo cron | sed '$(transform_exe)'`; \
 	test ! -f $(DESTDIR)$(sbindir)/$${tcron}
 endif !MULTI_USER
 
@@ -220,10 +219,10 @@ gen_man = \
   esac
 
 $(srcdir)/doc/mcron.1: src/mcron/scripts/mcron.scm bin/mcron
-	-@prog="mcron"; man_section=1; $(gen_man)
+	-@prog="bin/mcron"; man_section=1; $(gen_man)
 
 $(srcdir)/doc/crontab.1: src/mcron/scripts/crontab.scm bin/crontab
-	-@prog="crontab"; man_section=1; $(gen_man)
+	-@prog="bin/crontab"; man_section=1;	 $(gen_man)
 
 $(srcdir)/doc/cron.8: src/mcron/scripts/cron.scm bin/cron
 	-@prog="cron"; man_section=8; $(gen_man)