[gcc r13-4994] modula-2, doc: Build dvi, ps and pdf doc in the gcc/doc directory.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:e15e8d430c5f6a85334f67fd552850e8aa27a7cf

commit r13-4994-ge15e8d430c5f6a85334f67fd552850e8aa27a7cf
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sat Dec 31 13:22:56 2022 +0000

    modula-2, doc: Build dvi, ps and pdf doc in the gcc/doc directory.
    
    This also uses the configured $(TEXI2DVI) and $(TEXI2PDF) to deal with those
    targets (since we cannot assume to know what the use might have installed).
    
    gcc/m2/ChangeLog:
    
            * Make-lang.in (dvi, ps, pdf): Build in the gcc/doc directory, also
            use the configured tools for texi -> dvi and texi -> pdf.

Diff:
---
 gcc/m2/Make-lang.in | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/gcc/m2/Make-lang.in b/gcc/m2/Make-lang.in
index 3050f5a581c..b7dec120078 100644
--- a/gcc/m2/Make-lang.in
+++ b/gcc/m2/Make-lang.in
@@ -141,18 +141,22 @@ $(DESTDIR)$(man1dir)/$(GM2_INSTALL_NAME)$(man1ext): doc/m2.1 installdirs
 	-$(INSTALL_DATA) $< $@
 	-chmod a-x $@
 
-m2.dvi: $(TEXISRC)
-	$(TEXI2DVI) -I $(objdir)/m2 -I $(srcdir)/doc/include $(srcdir)/doc/gm2.texi -o $@
+m2.dvi: doc/m2.dvi
 
-m2.ps: m2.dvi
+doc/m2.dvi: $(TEXISRC)
+	$(TEXI2DVI) -c -I $(objdir)/m2 -I $(srcdir)/doc/include -o $@ $(srcdir)/doc/gm2.texi
+
+doc/m2.ps: doc/m2.dvi
 	dvips -o $@ $<
 
-m2.pdf: m2.ps
-	gs -q -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=$@ $<
+m2.pdf: doc/m2.pdf
+
+doc/m2.pdf: $(TEXISRC)
+	$(TEXI2PDF) -I $(objdir)/m2 -I $(srcdir)/doc/include $(srcdir)/doc/gm2.texi -o $@
 
 .INTERMEDIATE: m2.pod
 
-m2.pod: doc/gm2.texi $(TEXISRC)
+m2.pod: $(TEXISRC)
 	-$(TEXI2POD) -I $(objdir)/m2 -D m2 < $< > $@
 
 doc/m2.info: $(TEXISRC)