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.

8 files changed, 117 insertions, 63 deletions

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 7b037c1..f156ea6 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -765,6 +765,7 @@ INSTALL_HEADERS=install-headers install-mkheaders
 
 # Control whether manpages generated by sphinx-build can be rebuilt.
 SPHINX_BUILD = @SPHINX_BUILD@
+HAS_SPHINX_BUILD = @HAS_SPHINX_BUILD@
 
 # Additional directories of header files to run fixincludes on.
 # These should be directories searched automatically by default
@@ -3274,7 +3275,7 @@ install-no-fixedincludes:
 
 # Remake the info files.
 
-doc: $(SPHINX_BUILD)
+doc: $(HAS_SPHINX_BUILD)
 
 INFOFILES = doc/gcc/info/texinfo/gcc.info \
 	    doc/gccint/info/texinfo/gccint.info \
@@ -3293,19 +3294,19 @@ PDFFILES = doc/gcc/pdf/latex/gcc.pdf doc/gccint/pdf/latex/gccint.pdf doc/install
 pdf:: $(PDFFILES) lang.pdf
 
 doc/gcc/pdf/latex/gcc.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gccint/pdf/latex/gccint.pdf: $(SPHINX_FILES) s-tm-rst-in
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/gccint BUILDDIR=$(objdir)/doc/gccint/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/gccint BUILDDIR=$(objdir)/doc/gccint/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/install/pdf/latex/install.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/install BUILDDIR=$(objdir)/doc/install/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/install BUILDDIR=$(objdir)/doc/install/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/cpp/pdf/latex/cpp.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/cppinternals/pdf/latex/cppinternals.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/cppinternals BUILDDIR=$(objdir)/doc/cppinternals/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_docdir)/cppinternals BUILDDIR=$(objdir)/doc/cppinternals/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 # List the directories or single hmtl files which are installed by
 # install-html. The lang.html file triggers language fragments to build
@@ -3321,19 +3322,19 @@ HTMLS = doc/gcc/html/html/index.html doc/gccint/html/html/index.html doc/install
 html:: $(HTMLS) lang.html
 
 doc/gcc/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/html SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gccint/html/html/index.html: $(SPHINX_FILES) s-tm-rst-in
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/gccint BUILDDIR=$(objdir)/doc/gccint/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/gccint BUILDDIR=$(objdir)/doc/gccint/html SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/install/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/install BUILDDIR=$(objdir)/doc/install/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/install BUILDDIR=$(objdir)/doc/install/html SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/cpp/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/html SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/cppinternals/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/cppinternals BUILDDIR=$(objdir)/doc/cppinternals/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_docdir)/cppinternals BUILDDIR=$(objdir)/doc/cppinternals/html SPHINXBUILD=$(SPHINX_BUILD)
 
 MANFILES = doc/gcc/man/man/gcc.1 doc/cpp/man/man/cpp.1 \
 	   doc/gcc/man/man/gfdl.7 doc/gcc/man/man/gpl.7 \
@@ -3350,14 +3351,14 @@ man: $(MANFILES) lang.man @GENINSRC@ srcman lang.srcman
 srcman: $(MANFILES)
 	-cp -p $^ $(srcdir)/doc
 
-sphinx-build: man info
+has-sphinx-build: man info
 
 RST_FILES:=$(shell find $(srcdir) -name *.rst -or -name *.rst.in)
 SPHINX_CONFIG_FILES:=$(shell find $(srcdir)/.. -name conf.py) $(srcdir)/../doc/baseconf.py
 SPHINX_FILES:=$(RST_FILES) $(SPHINX_CONFIG_FILES)
 
 doc/gcc/man/man/gcc.1: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/man
+	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/man SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gcc/man/man/gcov.1: doc/gcc/man/man/gcc.1
 doc/gcc/man/man/gcov-tool.1: doc/gcc/man/man/gcc.1
@@ -3368,22 +3369,22 @@ doc/gcc/man/man/gpl.7: doc/gcc/man/man/gcc.1
 doc/gcc/man/man/fsf-funding.7: doc/gcc/man/man/gcc.1
 
 doc/cpp/man/man/cpp.1: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/man
+	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/man SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gcc/info/texinfo/gcc.info: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/info
+	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/gcc BUILDDIR=$(objdir)/doc/gcc/info SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gccint/info/texinfo/gccint.info: $(SPHINX_FILES) s-tm-rst-in
-	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/gccint BUILDDIR=$(objdir)/doc/gccint/info
+	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/gccint BUILDDIR=$(objdir)/doc/gccint/info SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/cpp/info/texinfo/cpp.info: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/info
+	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/cpp BUILDDIR=$(objdir)/doc/cpp/info SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/cppinternals/info/texinfo/cppinternals.info: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/cppinternals BUILDDIR=$(objdir)/doc/cppinternals/info
+	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/cppinternals BUILDDIR=$(objdir)/doc/cppinternals/info SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/install/info/texinfo/install.info: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/install BUILDDIR=$(objdir)/doc/install/info
+	+ make -C $(srcdir)/../doc info SOURCEDIR=$(abs_docdir)/install BUILDDIR=$(objdir)/doc/install/info SPHINXBUILD=$(SPHINX_BUILD)
 
 #
 # Deletion of files made during compilation.
diff --git a/gcc/ada/gcc-interface/Make-lang.in b/gcc/ada/gcc-interface/Make-lang.in
index 71a26e5..555d2ef 100644
--- a/gcc/ada/gcc-interface/Make-lang.in
+++ b/gcc/ada/gcc-interface/Make-lang.in
@@ -809,18 +809,18 @@ ada.tags: force
 # Generate documentation.
 
 doc/gnat_ugn/info/texinfo/gnat_ugn.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_ugn BUILDDIR=$(objdir)/doc/gnat_ugn/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_ugn BUILDDIR=$(objdir)/doc/gnat_ugn/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 doc/gnat_rm/info/texinfo/gnat_rm.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_rm BUILDDIR=$(objdir)/doc/gnat_rm/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_rm BUILDDIR=$(objdir)/doc/gnat_rm/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 doc/gnat-style/info/texinfo/gnat-style.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/ada/doc/gnat-style BUILDDIR=$(objdir)/doc/gnat-style/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/ada/doc/gnat-style BUILDDIR=$(objdir)/doc/gnat-style/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 ADA_INFOFILES = doc/gnat_ugn/info/texinfo/gnat_ugn.info \
@@ -855,13 +855,13 @@ ADA_PDFFILES = doc/gnat_ugn/pdf/latex/gnat_ugn.pdf\
 ada.pdf: $(ADA_PDFFILES)
 
 doc/gnat_ugn/pdf/latex/gnat_ugn.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_ugn BUILDDIR=$(objdir)/doc/gnat_ugn/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_ugn BUILDDIR=$(objdir)/doc/gnat_ugn/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gnat_rm/pdf/latex/gnat_rm.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_rm BUILDDIR=$(objdir)/doc/gnat_rm/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_rm BUILDDIR=$(objdir)/doc/gnat_rm/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gnat-style/pdf/latex/gnat-style.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/ada/doc/gnat-style BUILDDIR=$(objdir)/doc/gnat-style/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/ada/doc/gnat-style BUILDDIR=$(objdir)/doc/gnat-style/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 ada.install-pdf: $(ADA_PDFFILES)
 	@$(NORMAL_INSTALL)
@@ -876,13 +876,13 @@ ada.install-pdf: $(ADA_PDFFILES)
 ada.html: doc/gnat_ugn/html/html/index.html doc/gnat_rm/html/html/index.html doc/gnat-style/html/html/index.html
 
 doc/gnat_ugn/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_ugn BUILDDIR=$(objdir)/doc/gnat_ugn/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_ugn BUILDDIR=$(objdir)/doc/gnat_ugn/html SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gnat_rm/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_rm BUILDDIR=$(objdir)/doc/gnat_rm/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/ada/doc/gnat_rm BUILDDIR=$(objdir)/doc/gnat_rm/html SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gnat-style/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/ada/doc/gnat-style BUILDDIR=$(objdir)/doc/gnat-style/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/ada/doc/gnat-style BUILDDIR=$(objdir)/doc/gnat-style/html SPHINXBUILD=$(SPHINX_BUILD)
 
 ada.install-html:
 
diff --git a/gcc/configure b/gcc/configure
index ca1169f..1a32f89 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -807,7 +807,9 @@ AR
 NM
 BISON
 FLEX
+HAS_SPHINX_BUILD
 SPHINX_BUILD
+CONFIGURE_SPHINX_BUILD
 GENERATED_MANPAGES
 BUILD_INFO
 MAKEINFO
@@ -982,6 +984,7 @@ with_changes_root_url
 enable_languages
 with_multilib_list
 with_multilib_generator
+with_sphinx_build
 with_zstd
 with_zstd_include
 with_zstd_lib
@@ -1836,6 +1839,7 @@ Optional Packages:
                           SH and x86-64 only)
   --with-multilib-generator
                           Multi-libs configuration string (RISC-V only)
+  --with-sphinx-build=    Use sphinx-build from a given path
   --with-zstd=PATH        specify prefix directory for installed zstd library.
                           Equivalent to --with-zstd-include=PATH/include plus
                           --with-zstd-lib=PATH/lib
@@ -8806,12 +8810,34 @@ $as_echo "no" >&6; }
 fi
 
 
+
+# Check whether --with-sphinx-build was given.
+if test "${with_sphinx_build+set}" = set; then :
+  withval=$with_sphinx_build; CONFIGURE_SPHINX_BUILD=$withval
+else
+  CONFIGURE_SPHINX_BUILD=
+
+fi
+
+
+
 # See if sphinx-build has been installed and is modern enough
 # that we can use it.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sphinx-build" >&5
 $as_echo_n "checking for sphinx-build... " >&6; }
-if sphinx-build -j auto -h &>/dev/null ; then
-  SPHINX_BUILD=sphinx-build
+sphinx=sphinx-build
+if test x${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
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
 else
@@ -8824,7 +8850,11 @@ $as_echo "$as_me: WARNING:
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
   SPHINX_BUILD=
+  HAS_SPHINX_BUILD=
 fi
+rm -rf $tempdir
+rm -rf $source
+
 
 
 MISSING="${CONFIG_SHELL-/bin/sh} $ac_aux_dir/missing"
@@ -19732,7 +19762,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19735 "configure"
+#line 19765 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -19838,7 +19868,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19841 "configure"
+#line 19871 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index f1de29e..f87fab9 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1253,11 +1253,30 @@ else
 fi
 AC_SUBST(GENERATED_MANPAGES)
 
+AC_ARG_WITH(sphinx-build,
+  [AS_HELP_STRING([--with-sphinx-build=],
+                  [Use sphinx-build from a given path])],
+  [CONFIGURE_SPHINX_BUILD=$withval],
+  [CONFIGURE_SPHINX_BUILD=]
+)
+AC_SUBST(CONFIGURE_SPHINX_BUILD)
+
 # See if sphinx-build has been installed and is modern enough
 # that we can use it.
 AC_MSG_CHECKING([for sphinx-build])
-if sphinx-build -j auto -h &>/dev/null ; then
-  SPHINX_BUILD=sphinx-build
+sphinx=sphinx-build
+if test x${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([
@@ -1265,8 +1284,12 @@ else
   *** 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)
 
 MISSING="${CONFIG_SHELL-/bin/sh} $ac_aux_dir/missing"
 
diff --git a/gcc/d/Make-lang.in b/gcc/d/Make-lang.in
index 87178e3..47bee4c 100644
--- a/gcc/d/Make-lang.in
+++ b/gcc/d/Make-lang.in
@@ -237,15 +237,15 @@ d21$(exeext): $(D_ALL_OBJS) attribs.o $(BACKEND) $(LIBDEPS) $(d.prev)
 
 # Documentation.
 doc/gdc/info/texinfo/gdc.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 doc/gdc.pdf: $(D_TEXI_FILES)
 	$(TEXI2PDF) -I $(abs_docdir) -I $(abs_docdir)/include -o $@ $<
 
 doc/gdc/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/html SPHINXBUILD=$(SPHINX_BUILD)
 # Build hooks.
 
 d.all.cross: gdc-cross$(exeext)
@@ -271,7 +271,7 @@ d.srcman: doc/gdc/man/man/gdc.1
 	-cp -p $^ $(srcdir)/doc
 
 doc/gdc/man/man/gdc.1: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/man
+	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/man SPHINXBUILD=$(SPHINX_BUILD)
 
 # 'make check' in gcc/ looks for check-d, as do all toplevel D-related
 # check targets.  However, our DejaGNU framework requires 'check-gdc' as its
@@ -304,7 +304,7 @@ d.install-plugin:
 d.install-info: $(DESTDIR)$(infodir)/gdc.info
 
 doc/gdc/pdf/latex/gdc.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/d/doc BUILDDIR=$(objdir)/doc/gdc/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 $(DESTDIR)$(infodir)/gdc.info: doc/gdc/info/texinfo/gdc.info installdirs
 	-rm -f $@
diff --git a/gcc/fortran/Make-lang.in b/gcc/fortran/Make-lang.in
index 17c0474..dc2006d 100644
--- a/gcc/fortran/Make-lang.in
+++ b/gcc/fortran/Make-lang.in
@@ -119,8 +119,8 @@ fortran.tags: force
 fortran.info: doc/gfortran/info/texinfo/gfortran.info doc/gfc-internals/info/texinfo/gfc-internals.info
 
 doc/gfortran/info/texinfo/gfortran.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/gfortran/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/gfortran/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 F95_HTMLFILES = doc/fortran/html/html/index.html
@@ -161,7 +161,7 @@ fortran.install-pdf: $(F95_PDFFILES)
 F95_MANFILES = doc/gfortran/man/man/gfortran.1
 
 doc/gfortran/man/man/gfortran.1: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/gfortran/man
+	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/gfortran/man SPHINXBUILD=$(SPHINX_BUILD)
 
 fortran.man: $(F95_MANFILES)
 
@@ -183,22 +183,22 @@ check_gfortran_parallelize = 10000
 selftest-fortran:
 
 doc/fortran/pdf/latex/gfortran.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/fortran/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/fortran/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/fortran/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/fortran/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/fortran/doc/gfortran BUILDDIR=$(objdir)/doc/fortran/html SPHINXBUILD=$(SPHINX_BUILD)
 
 # GFORTRAN internals documentation.
 doc/gfc-internals/info/texinfo/gfc-internals.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/fortran/doc/gfc-internals BUILDDIR=$(objdir)/doc/gfc-internals/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/fortran/doc/gfc-internals BUILDDIR=$(objdir)/doc/gfc-internals/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 doc/gfc-internals/pdf/latex/gfc-internals.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/fortran/doc/gfc-internals BUILDDIR=$(objdir)/doc/gfc-internals/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/fortran/doc/gfc-internals BUILDDIR=$(objdir)/doc/gfc-internals/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gfc-internals/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/fortran/doc/gfc-internals BUILDDIR=$(objdir)/doc/gfc-internals/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/fortran/doc/gfc-internals BUILDDIR=$(objdir)/doc/gfc-internals/html SPHINXBUILD=$(SPHINX_BUILD)
 
 # Create or recreate the gfortran private include file directory.
 install-finclude-dir: installdirs
diff --git a/gcc/go/Make-lang.in b/gcc/go/Make-lang.in
index e5de16f..b1b1b5f 100644
--- a/gcc/go/Make-lang.in
+++ b/gcc/go/Make-lang.in
@@ -89,15 +89,15 @@ go1$(exeext): $(GO_OBJS) attribs.o $(BACKEND) $(LIBDEPS) $(go.prev)
 # Documentation.
 
 doc/gccgo/info/texinfo/gccgo.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/go/doc/ BUILDDIR=$(objdir)/doc/gccgo/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/go/doc/ BUILDDIR=$(objdir)/doc/gccgo/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 doc/gccgo/pdf/latex/gccgo.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/go/doc/ BUILDDIR=$(objdir)/doc/gccgo/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/go/doc/ BUILDDIR=$(objdir)/doc/gccgo/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 doc/gccgo/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/go/doc/ BUILDDIR=$(objdir)/doc/gccgo/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/go/doc/ BUILDDIR=$(objdir)/doc/gccgo/html SPHINXBUILD=$(SPHINX_BUILD)
 
 # Build hooks.
 
@@ -126,7 +126,7 @@ go.srcman: doc/gccgo/man/man/gccgo.1
 	-cp -p $^ $(srcdir)/doc
 
 doc/gccgo/man/man/gccgo.1: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/go/doc BUILDDIR=$(objdir)/doc/gccgo/man
+	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/go/doc BUILDDIR=$(objdir)/doc/gccgo/man SPHINXBUILD=$(SPHINX_BUILD)
 
 lang_checks += check-go
 lang_checks_parallelized += check-go
diff --git a/gcc/jit/Make-lang.in b/gcc/jit/Make-lang.in
index a9aee90..e972a25 100644
--- a/gcc/jit/Make-lang.in
+++ b/gcc/jit/Make-lang.in
@@ -244,8 +244,8 @@ jit.install-pdf: jit.texinfo.install-pdf
 jit.info: doc/libgccjit/info/texinfo/libgccjit.info
 
 doc/libgccjit/info/texinfo/libgccjit.info: $(SPHINX_FILES)
-	+ if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \
-	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/info; \
+	+ if [ x$(HAS_SPHINX_BUILD) = xhas-sphinx-build ]; then \
+	  make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/info SPHINXBUILD=$(SPHINX_BUILD); \
 	else true; fi
 
 jit.install-info: $(DESTDIR)$(infodir)/libgccjit.info
@@ -255,7 +255,7 @@ $(DESTDIR)$(infodir)/libgccjit.info: doc/libgccjit/info/texinfo/libgccjit.info i
 	-$(INSTALL_DATA) $< $@
 
 doc/libgccjit/html/html/index.html: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/html
+	+ make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/html SPHINXBUILD=$(SPHINX_BUILD)
 
 jit.texinfo.install-html: doc/libgccjit/html/html/index.html
 	@$(NORMAL_INSTALL)
@@ -276,7 +276,7 @@ jit.texinfo.install-html: doc/libgccjit/html/html/index.html
 
 
 doc/libgccjit/pdf/latex/libgccjit.pdf: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/pdf
+	+ make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/pdf SPHINXBUILD=$(SPHINX_BUILD)
 
 jit.texinfo.install-pdf: doc/libgccjit.pdf
 	@$(NORMAL_INSTALL)
@@ -295,7 +295,7 @@ SPHINX_BUILD_DIR=jit/sphinx-build
 jit.sphinx.html:
 	$(mkinstalldirs) $(SPHINX_BUILD_DIR)
 	(cd $(srcdir)/jit/docs && \
-	  make html BUILDDIR=$(PWD)/$(SPHINX_BUILD_DIR) )
+	  make html BUILDDIR=$(PWD)/$(SPHINX_BUILD_DIR) ) SPHINXBUILD=$(SPHINX_BUILD)
 
 jit_htmldir=$(htmldir)/jit
 
@@ -316,7 +316,7 @@ jit.sphinx.pdf: $(SPHINX_BUILD_DIR)/latex/libgccjit.pdf
 $(SPHINX_BUILD_DIR)/latex/libgccjit.pdf:
 	$(mkinstalldirs) $(SPHINX_BUILD_DIR)
 	(cd $(srcdir)/jit/docs && \
-	  make latexpdf BUILDDIR=$(PWD)/$(SPHINX_BUILD_DIR) )
+	  make latexpdf BUILDDIR=$(PWD)/$(SPHINX_BUILD_DIR) ) SPHINXBUILD=$(SPHINX_BUILD)
 
 jit.sphinx.install-pdf: $(SPHINX_BUILD_DIR)/latex/libgccjit.pdf
 	@$(NORMAL_INSTALL)
@@ -336,7 +336,7 @@ jit.tags:
 jit.man: doc/libgccjit/man/man/libgccjit.1
 
 doc/libgccjit/man/man/libgccjit.1: $(SPHINX_FILES)
-	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/man
+	+ make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/man SPHINXBUILD=$(SPHINX_BUILD)
 
 jit.srcman: