Move duplicated documentation rules to Makefile.shared

- Also, harmonize libm to use CHEWOUT_FILES like libc, rather than chobj.
  Update documentation appropriately.

        * HOWTO: Update.
        * Makefile.shared: Move documentation rules to here...
        * libc/argz/Makefile.am: ... from here ...
        * libc/ctype/Makefile.am: ... and here.
        * libc/errno/Makefile.am: Ditto.
        * libc/iconv/Makefile.am: Ditto.
        * libc/iconv/ccs/Makefile.am : Ditto.
        * libc/iconv/ces/Makefile.am: Ditto.
        * libc/iconv/lib/Makefile.am: Ditto.
        * libc/locale/Makefile.am: Ditto.
        * libc/misc/Makefile.am: Ditto.
        * libc/posix/Makefile.am: Ditto.
        * libc/reent/Makefile.am: Ditto.
        * libc/search/Makefile.am: Ditto.
        * libc/stdio/Makefile.am: Ditto.
        * libc/stdio64/Makefile.am: Ditto.
        * libc/stdlib/Makefile.am : Ditto.
        * libc/string/Makefile.am: Ditto.
        * libc/syscalls/Makefile.am: Ditto.
        * libc/time/Makefile.am : Ditto.
        * libc/unix/Makefile.am: Ditto.
        * libc/xdr/Makefile.am: Ditto.
        * libm/common/Makefile.am: Ditto.
        * libm/complex/Makefile.am: Ditto.
        * libm/math/Makefile.am: Ditto.
        * libm/mathfp/Makefile.am: Ditto.

2 files changed, 15 insertions, 18 deletions

diff --git a/newlib/libc/errno/Makefile.am b/newlib/libc/errno/Makefile.am
index db5bb3d1c..187e303c4 100644
--- a/newlib/libc/errno/Makefile.am
+++ b/newlib/libc/errno/Makefile.am
@@ -22,18 +22,5 @@ endif # USE_LIBTOOL
 include $(srcdir)/../../Makefile.shared
 
 CHEWOUT_FILES =
-
-SUFFIXES = .def
-
-CHEW = ../../doc/makedoc -f $(srcdir)/../../doc/doc.str
-
-.c.def:
-	$(CHEW) < $< > $*.def 2> $*.ref
-	touch stmp-def
-
-TARGETDOC = ../tmp.texi
-
+CHAPTERS =
 # No doc for errno.
-doc:
-
-CLEANFILES = $(CHEWOUT_FILES) *.ref
diff --git a/newlib/libc/errno/Makefile.in b/newlib/libc/errno/Makefile.in
index fe727e8be..a6c56c816 100644
--- a/newlib/libc/errno/Makefile.in
+++ b/newlib/libc/errno/Makefile.in
@@ -260,11 +260,15 @@ liberrno_la_LDFLAGS = -Xcompiler -nostdlib
 @USE_LIBTOOL_FALSE@noinst_LIBRARIES = lib.a
 @USE_LIBTOOL_FALSE@lib_a_SOURCES = $(LIB_SOURCES)
 @USE_LIBTOOL_FALSE@lib_a_CFLAGS = $(AM_CFLAGS)
-CHEWOUT_FILES = 
+
+#
+# documentation rules
+#
 SUFFIXES = .def
-CHEW = ../../doc/makedoc -f $(srcdir)/../../doc/doc.str
-TARGETDOC = ../tmp.texi
+CHEW = ${top_builddir}/../doc/makedoc -f $(top_srcdir)/../doc/doc.str
 CLEANFILES = $(CHEWOUT_FILES) *.ref
+CHEWOUT_FILES = 
+CHAPTERS = 
 all: all-am
 
 .SUFFIXES:
@@ -528,8 +532,14 @@ objectlist.awk.in: $(noinst_LTLIBRARIES)
 	$(CHEW) < $< > $*.def 2> $*.ref
 	touch stmp-def
 
+TARGETDOC ?= ../tmp.texi
+
+doc: $(CHEWOUT_FILES)
+	for chapter in $(CHAPTERS) ; \
+	do \
+	  cat $(srcdir)/$$chapter >> $(TARGETDOC) ; \
+	done
 # No doc for errno.
-doc:
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.