sphinx: add --with-sphinx-build

gcc/ChangeLog:

	* Makefile.in: Support --with-sphinx-build.
	* configure.ac:
	* configure: Regenerate.

gcc/ada/ChangeLog:

	* gcc-interface/Make-lang.in: Support --with-sphinx-build.

gcc/d/ChangeLog:

	* Make-lang.in: Support --with-sphinx-build.

gcc/fortran/ChangeLog:

	* Make-lang.in: Support --with-sphinx-build.

gcc/go/ChangeLog:

	* Make-lang.in: Support --with-sphinx-build.

gcc/jit/ChangeLog:

	* Make-lang.in: Support --with-sphinx-build.

libgomp/ChangeLog:

	* Makefile.in: Support --with-sphinx-build.
	* configure.ac: Likewise..
	* configure: Regenerate.

libiberty/ChangeLog:

	* Makefile.in: Support --with-sphinx-build.
	* configure.ac: Likewise.
	* configure: Regenerate.

libitm/ChangeLog:

	* Makefile.in: Support --with-sphinx-build.
	* configure.ac: Likewise.
	* configure: Regenerate.

libquadmath/ChangeLog:

	* Makefile.in: Support --with-sphinx-build.
	* configure.ac: Likewise.
	* configure: Regenerate.

1 files changed, 38 insertions, 0 deletions

diff --git a/libgomp/configure.ac b/libgomp/configure.ac
index a9b1f3973f7..1aeac2d3cca 100644
--- a/libgomp/configure.ac
+++ b/libgomp/configure.ac
@@ -469,6 +469,44 @@ AC_SUBST(OMP_NEST_LOCK_25_KIND)
 AC_SUBST(OMP_DEPEND_KIND)
 CFLAGS="$save_CFLAGS"
 
+AC_ARG_WITH(sphinx-build,
+  [AS_HELP_STRING([--with-sphinx-build=],
+                  [Use sphinx-build from a given path])],
+  [CONFIGURE_SPHINX_BUILD=$withval],
+  [CONFIGURE_SPHINX_BUILD=]
+)
+AC_SUBST(CONFIGURE_SPHINX_BUILD)
+
+# See if sphinx-build has been installed and is modern enough
+# that we can use it.
+AC_MSG_CHECKING([for sphinx-build])
+sphinx=sphinx-build
+if test x${CONFIGURE_SPHINX_BUILD} != x ; then
+  sphinx=${CONFIGURE_SPHINX_BUILD}
+fi
+
+tempdir=build.$$
+source=source.$$
+mkdir $source
+grep 'needs_sphinx =' ${srcdir}/../doc/baseconf.py > $source/conf.py
+touch $source/index.rst
+if ${sphinx} $source $tempdir >/dev/null 2>&1; then
+  SPHINX_BUILD=${sphinx}
+  HAS_SPHINX_BUILD=has-sphinx-build
+  AC_MSG_RESULT(yes)
+else
+  AC_MSG_WARN([
+  *** sphinx-build is missing or too old.
+  *** Info and man pages documentation will not be built.])
+  AC_MSG_RESULT(no)
+  SPHINX_BUILD=
+  HAS_SPHINX_BUILD=
+fi
+rm -rf $tempdir
+rm -rf $source
+AC_SUBST(SPHINX_BUILD)
+AC_SUBST(HAS_SPHINX_BUILD)
+
 # Determine what GCC version number to use in filesystem paths.
 GCC_BASE_VER