[build]: Detangle pdfroff, gropdf config (1/2).

* m4/groff.m4 (GROFF_GROPDF_DEPENDENCIES_CHECK): Add `AC_REQUIRE`ment on
  `GROFF_URW_FONTS_CHECK`.  Per discussion with Deri James, if _either_
  Ghostscript or the URW fonts are avilable, gropdf will be fully
  functional, consequent to commit d5515, 22 June.  Drop dependency on
  awk; it is used only at configuration time (in an Autoconf macro) and
  since Savannah #62775 was resolved (19 September), it has not been
  strictly necessary.  (It is useful for searching more locations for
  URW fonts, but several others are searched even if it is absent.)
  Stop populating notice text here, instead moving it...

  (GROFF_GROPDF_PROGRAM_NOTICE): ...here, since it no longer needs to be
  dynamically constructed.

Continues <https://savannah.gnu.org/bugs/?63808>.  Thanks to Deri James
for the continued discussion.

1 files changed, 14 insertions, 24 deletions

diff --git a/m4/groff.m4 b/m4/groff.m4
index 1e0e7aae9..a99691e41 100644
--- a/m4/groff.m4
+++ b/m4/groff.m4
@@ -239,8 +239,7 @@ AC_DEFUN([GROFF_GROHTML_PROGRAM_NOTICE], [
   fi
 ])
 
-# gropdf needs awk and Ghostscript to have produced (a full set of) its
-# font description files.
+dnl pdfroff uses awk, and we use it in GROFF_URW_FONTS_CHECK.
 
 AC_DEFUN([GROFF_AWK_NOTICE], [
   AC_REQUIRE([GROFF_AWK_PATH])
@@ -262,44 +261,35 @@ AC_DEFUN([GROFF_AWK_NOTICE], [
 
 AC_DEFUN([GROFF_GROPDF_DEPENDENCIES_CHECK], [
   AC_REQUIRE([GROFF_GHOSTSCRIPT_PATH])
+  AC_REQUIRE([GROFF_URW_FONTS_CHECK])
 
   use_gropdf=no
   gropdf_missing_deps=
 
-  test "$AWK" = missing && gropdf_missing_deps="awk"
-
-  if test "$GHOSTSCRIPT" = missing
+  if test "$GHOSTSCRIPT" != missing \
+    || test "$groff_have_urw_fonts" = yes
   then
-    if test -n "$gropdf_missing_deps"
-    then
-      gropdf_missing_deps="$gropdf_missing_deps and "
-    fi
-    gropdf_missing_deps="${gropdf_missing_deps}Ghostscript"
+    use_gropdf=yes
   fi
 
-  if test -z "$gropdf_missing_deps"
+  AC_SUBST([use_gropdf])
+])
+
+AC_DEFUN([GROFF_GROPDF_PROGRAM_NOTICE], [
+  AC_REQUIRE([GROFF_GROPDF_DEPENDENCIES_CHECK])
+
+  if test "$use_gropdf" = no
   then
-    use_gropdf=yes
-  else
-    gropdf_notice="'gropdf' will have reduced function.
+    AC_MSG_NOTICE(['gropdf' will have reduced function.
 
-  Due to the missing $gropdf_missing_deps described above, groff
+  Because neither Ghostscript nor URW fonts are available, groff
   documentation will not be available in PDF.
 
   'gropdf' will be able to handle only documents using the standard PDF
   base 14 fonts, plus the 'EURO' font groff supplies, and font embedding
   with its '-e' option (accessed via the 'groff' command with the option
   '-P -e') will not be possible.
-"
-  fi
-
-  AC_SUBST([use_gropdf])
 ])
-
-AC_DEFUN([GROFF_GROPDF_PROGRAM_NOTICE], [
-  if test "$use_gropdf" = no
-  then
-    AC_MSG_NOTICE([$gropdf_notice])
   fi
 ])