[COMMITTED] ada: Add makefile targets for building/installing html doc

[Marc Poulhiès]

Add the ada.html and ada.install-html targets so that we can build the
html with `make html`.

gcc/ada/

        * gcc-interface/Make-lang.in (ada.html, ada.install-html): Add.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/gcc-interface/Make-lang.in | 35 ++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

diff --git a/gcc/ada/gcc-interface/Make-lang.in 
b/gcc/ada/gcc-interface/Make-lang.in
index 97830ee37f9..2cf0c6d0977 100644
--- a/gcc/ada/gcc-interface/Make-lang.in
+++ b/gcc/ada/gcc-interface/Make-lang.in
@@ -889,10 +889,6 @@ ada.install-pdf: $(ADA_PDFFILES)
          $(INSTALL_DATA) "$$d$$p" "$(DESTDIR)$(pdfdir)/gcc/$$f"; \
        done
 
-ada.html:
-
-ada.install-html:
-
 doc/gnat_ugn.dvi: ada/gnat_ugn.texi \
        $(gcc_docdir)/include/fdl.texi  \
        $(gcc_docdir)/include/gcc-common.texi gcc-vers.texi
@@ -917,6 +913,37 @@ doc/gnat_rm.pdf: ada/gnat_rm.texi 
$(gcc_docdir)/include/fdl.texi   \
 doc/gnat-style.pdf: ada/gnat-style.texi $(gcc_docdir)/include/fdl.texi
        $(TEXI2PDF) -c -I $(abs_docdir)/include -o $@ $<
 
+ADA_TEXI_FILES = \
+       ada/gnat_rm.texi \
+       ada/gnat_ugn.texi \
+       $(gcc_docdir)/include/fdl.texi \
+       $(gcc_docdir)/include/gpl_v3.texi \
+       $(gcc_docdir)/include/gcc-common.texi \
+       gcc-vers.texi
+
+$(build_htmldir)/ada/index.html: $(ADA_TEXI_FILES)
+       $(mkinstalldirs) $(@D)
+       rm -f $(@D)/*
+       $(TEXI2HTML) -I $(gcc_docdir)/include -I $(srcdir)/ada -o $(@D) $<
+
+ada.html: $(build_htmldir)/ada/index.html
+ada.install-html: $(build_htmldir)/ada
+       @$(NORMAL_INSTALL)
+       test -z "$(htmldir)" || $(mkinstalldirs) "$(DESTDIR)$(htmldir)"
+       @for p in $(build_htmldir)/ada; do \
+         if test -f "$$p" || test -d "$$p"; then d=""; else d="$(srcdir)/"; 
fi; \
+         f=$(html__strip_dir) \
+         if test -d "$$d$$p"; then \
+           echo " $(mkinstalldirs) '$(DESTDIR)$(htmldir)/$$f'"; \
+           $(mkinstalldirs) "$(DESTDIR)$(htmldir)/$$f" || exit 1; \
+           echo " $(INSTALL_DATA) '$$d$$p'/* '$(DESTDIR)$(htmldir)/$$f'"; \
+           $(INSTALL_DATA) "$$d$$p"/* "$(DESTDIR)$(htmldir)/$$f"; \
+         else \
+           echo " $(INSTALL_DATA) '$$d$$p' '$(DESTDIR)$(htmldir)/$$f'"; \
+           $(INSTALL_DATA) "$$d$$p" "$(DESTDIR)$(htmldir)/$$f"; \
+         fi; \
+       done
+
 # Install hooks:
 # gnat1 is installed elsewhere as part of $(COMPILERS).
 
-- 
2.43.0