html: Set CONTENTS_OUTPUT_LOCATION=inline if makeinfo supports it

This flag allows us to restore old (pre-6.8) behavior of the
@{summary,}content commands, so that texi2any continues to emit
summarycontents first.

maintainer-scripts/ChangeLog:

	* update_web_docs_git: Set CONTENTS_OUTPUT_LOCATION=inline in
	order to put @shortcontents above contents.

gcc/ChangeLog:

	* configure.ac: Add check for the Texinfo 6.8
	CONTENTS_OUTPUT_LOCATION customization variable and set it if
	supported.
	* configure: Regenerate.
	* Makefile.in (MAKEINFO_TOC_INLINE_FLAG): New variable.  Set by
	configure.ac to -c CONTENTS_OUTPUT_LOCATION=inline if
	CONTENTS_OUTPUT_LOCATION support is detected, empty otherwise.
	($(build_htmldir)/%/index.html): Pass MAKEINFO_TOC_INLINE_FLAG.

3 files changed, 59 insertions, 3 deletions

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 6001c9e..d8b76d8 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -787,6 +787,9 @@ INSTALL_HEADERS=install-headers install-mkheaders
 # Control whether Info documentation is built and installed.
 BUILD_INFO = @BUILD_INFO@
 
+# Control flags for @contents placement in HTML output
+MAKEINFO_TOC_INLINE_FLAG = @MAKEINFO_TOC_INLINE_FLAG@
+
 # Control whether manpages generated by texi2pod.pl can be rebuilt.
 GENERATED_MANPAGES = @GENERATED_MANPAGES@
 
@@ -3461,7 +3464,8 @@ html:: $(HTMLS_BUILD)
 $(build_htmldir)/%/index.html: %.texi
 	$(mkinstalldirs) $(@D)
 	rm -f $(@D)/*
-	$(TEXI2HTML) -I $(abs_docdir) -I $(abs_docdir)/include -o $(@D) $<
+	$(TEXI2HTML) $(MAKEINFO_TOC_INLINE_FLAG) \
+		-I $(abs_docdir) -I $(abs_docdir)/include -o $(@D) $<
 
 # Duplicate entry to handle renaming of gccinstall
 $(build_htmldir)/gccinstall/index.html: $(TEXI_GCCINSTALL_FILES)
diff --git a/gcc/configure b/gcc/configure
index 254f9b6..20d3142 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -810,6 +810,7 @@ PYTHON
 BISON
 FLEX
 GENERATED_MANPAGES
+MAKEINFO_TOC_INLINE_FLAG
 BUILD_INFO
 MAKEINFO
 have_mktemp_command
@@ -8795,6 +8796,36 @@ else
 fi
 
 
+# Determine whether makeinfo supports the CONTENTS_OUTPUT_LOCATION variable.
+# If it does, we want to pass it to makeinfo in order to restore the old
+# behaviour of @{summary,}contents placement.
+MAKEINFO_TOC_INLINE_FLAG=
+if test x"$MAKEINFO" != x; then :
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for CONTENTS_OUTPUT_LOCATION support in $MAKEINFO" >&5
+$as_echo_n "checking for CONTENTS_OUTPUT_LOCATION support in $MAKEINFO... " >&6; }
+if ${gcc_cv_texi_add_toc_inline_flags+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+    # Detect the unknown variable CONTENTS_OUTPUT_LOCATION warning
+    if "$MAKEINFO" -c CONTENTS_OUTPUT_LOCATION=inline </dev/null 2>&1 \
+       | grep CONTENTS_OUTPUT_LOCATION >/dev/null; then
+      gcc_cv_texi_add_toc_inline_flags=no
+    else
+      gcc_cv_texi_add_toc_inline_flags=yes
+    fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_texi_add_toc_inline_flags" >&5
+$as_echo "$gcc_cv_texi_add_toc_inline_flags" >&6; }
+  if test x"$gcc_cv_texi_add_toc_inline_flags" = xyes; then
+    MAKEINFO_TOC_INLINE_FLAG='-c CONTENTS_OUTPUT_LOCATION=inline'
+  fi
+
+fi
+
+
 # Is pod2man recent enough to regenerate manpages?
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for recent Pod::Man" >&5
 $as_echo_n "checking for recent Pod::Man... " >&6; }
@@ -19792,7 +19823,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19795 "configure"
+#line 19826 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -19898,7 +19929,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19901 "configure"
+#line 19932 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 62bc908..120151c 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1242,6 +1242,27 @@ else
 fi
 AC_SUBST(BUILD_INFO)
 
+# Determine whether makeinfo supports the CONTENTS_OUTPUT_LOCATION variable.
+# If it does, we want to pass it to makeinfo in order to restore the old
+# behavior of @{summary,}contents placement.
+MAKEINFO_TOC_INLINE_FLAG=
+AS_IF([test x"$MAKEINFO" != x], [
+  AC_CACHE_CHECK([for CONTENTS_OUTPUT_LOCATION support in $MAKEINFO],
+  		 [gcc_cv_texi_add_toc_inline_flags], [
+    # Detect the unknown variable CONTENTS_OUTPUT_LOCATION warning
+    if "$MAKEINFO" -c CONTENTS_OUTPUT_LOCATION=inline </dev/null 2>&1 \
+       | grep CONTENTS_OUTPUT_LOCATION >/dev/null; then
+      gcc_cv_texi_add_toc_inline_flags=no
+    else
+      gcc_cv_texi_add_toc_inline_flags=yes
+    fi
+  ])
+  if test x"$gcc_cv_texi_add_toc_inline_flags" = xyes; then
+    MAKEINFO_TOC_INLINE_FLAG='-c CONTENTS_OUTPUT_LOCATION=inline'
+  fi
+])
+AC_SUBST([MAKEINFO_TOC_INLINE_FLAG])
+
 # Is pod2man recent enough to regenerate manpages?
 AC_MSG_CHECKING([for recent Pod::Man])
 if (perl -e 'use 1.10 Pod::Man') >/dev/null 2>&1; then