docs: fix links pointing to gcc.gnu.org/install

Use https://gcc.gnu.org/onlinedocs/install/ instead.

ChangeLog:

	* configure.ac: Use new install URL.
	* configure: Regenerate.

gcc/ChangeLog:

	* Makefile.in: Use new install URL.
	* doc/gcc/gcc-command-options/machine-dependent-options/avr-options.rst:
	Use intersphinx link.
	* doc/gcc/gcc-command-options/options-to-control-diagnostic-messages-formatting.rst:
	Use new URL.
	* doc/gccint/source-tree-structure-and-build-system.rst: Use
	intersphinx link.
	* doc/install/host-target-specific-installation-notes-for-gcc.rst: Likewise.
	* doc/install/installing-gcc.rst: Likewise.

configure

@@ -8239,7 +8239,7 @@ Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
 their locations.  Source code for these libraries can be found at
 their respective hosting sites as well as at
 https://gcc.gnu.org/pub/gcc/infrastructure/.  See also
-http://gcc.gnu.org/install/prerequisites.html for additional info.  If
+https://gcc.gnu.org/onlinedocs/install/prerequisites.html for additional info.  If
 you obtained GMP, MPFR and/or MPC from a vendor distribution package,
 make sure that you have installed both the libraries and the header
 files.  They may be located in separate packages." "$LINENO" 5

configure.ac

@@ -1680,7 +1680,7 @@ Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
 their locations.  Source code for these libraries can be found at
 their respective hosting sites as well as at
 https://gcc.gnu.org/pub/gcc/infrastructure/.  See also
-http://gcc.gnu.org/install/prerequisites.html for additional info.  If
+https://gcc.gnu.org/onlinedocs/install/prerequisites.html for additional info.  If
 you obtained GMP, MPFR and/or MPC from a vendor distribution package,
 make sure that you have installed both the libraries and the header
 files.  They may be located in separate packages.])

gcc/Makefile.in

@@ -2035,7 +2035,7 @@ cstamp-h: config.in config.status
 # config.status does not exist before failing.
 config.status: $(srcdir)/configure $(srcdir)/config.gcc $(LANG_CONFIGUREFRAGS)
 	@if [ ! -f config.status ] ; then \
-	  echo You must configure gcc.  Look at http://gcc.gnu.org/install/ for details.; \
+	  echo You must configure gcc.  Look at http://gcc.gnu.org/onlinedocs/install/ for details.; \
 	  false; \
 	else \
 	  LANGUAGES="$(CONFIG_LANGUAGES)" $(SHELL) config.status --recheck; \

gcc/doc/gcc/gcc-command-options/machine-dependent-options/avr-options.rst

@@ -62,8 +62,7 @@ GCC supports the following AVR devices and ISAs:
   Set the size (in bits) of the ``double`` or ``long double`` type,
   respectively.  Possible values for :samp:`{bits}` are 32 and 64.
   Whether or not a specific value for :samp:`{bits}` is allowed depends on
-  the ``--with-double=`` and ``--with-long-double=``
-  `configure options <https://gcc.gnu.org/install/configure.html#avr>`_,
+  the :option:`install:--with-double=`` and ``--with-long-double=``,
   and the same applies for the default values of the options.
 
 .. option:: -mgas-isr-prologues

gcc/doc/gcc/gcc-command-options/options-to-control-diagnostic-messages-formatting.rst

@@ -687,7 +687,7 @@ honor these options.
             ],
             "message": "this ‘if’ clause does not guard...",
             "option": "-Wmisleading-indentation",
-            "option_url": "https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wmisleading-indentation",
+            "option_url": "https://gcc.gnu.org/onlinedocs/gcc/gcc-command-options/options-to-request-or-suppress-warnings.html#cmdoption-Wmisleading-indentation",
             "children": [
                 {
                     "kind": "note",

gcc/doc/gccint/source-tree-structure-and-build-system.rst

@@ -10,7 +10,7 @@ Source Tree Structure and Build System
 
 This chapter describes the structure of the GCC source tree, and how
 GCC is built.  The user documentation for building and installing GCC
-is in a separate manual (https://gcc.gnu.org/install/), with
+is in a separate manual (:ref:`install:installing-gcc`), with
 which it is presumed that you are familiar.
 
 .. toctree::

gcc/doc/install/host-target-specific-installation-notes-for-gcc.rst

@@ -157,7 +157,7 @@ a cross-compiler for CRIS.
 DOS
 ===
 
-Please have a look at the `binaries page <https://gcc.gnu.org/install/binaries.html>`_.
+Please have a look at the :ref:`binaries page <install:binaries>`.
 
 You cannot install GCC by itself on MSDOS; it will not compile under
 any MSDOS compiler except itself.  You need to get the complete
@@ -212,7 +212,7 @@ h8300-hms
 
 Renesas H8/300 series of processors.
 
-Please have a look at the `binaries page <https://gcc.gnu.org/install/binaries.html>`_.
+Please have a look at the :ref:`binaries page <install:binaries>`.
 
 The calling convention and structure layout has changed in release 2.6.
 All code must be recompiled.  The calling convention now passes the
@@ -288,7 +288,7 @@ be used to compile GCC 3.0 and up.
 
 The libffi library haven't been ported to 64-bit HP-UXand doesn't build.
 
-Refer to `binaries page <https://gcc.gnu.org/install/binaries.html>`_ for information about obtaining
+Refer to `binaries page <install:binaries>` for information about obtaining
 precompiled GCC binaries for HP-UX.  Precompiled binaries must be obtained
 to build the Ada language as it cannot be bootstrapped using C.  Ada is
 only available for the 32-bit PA-RISC runtime.

gcc/doc/install/installing-gcc.rst

@@ -9,7 +9,7 @@ Installing GCC
 --------------
 
 The latest version of this document is always available at
-`https://gcc.gnu.org/install/ <https://gcc.gnu.org/install/>`_.
+https://gcc.gnu.org/onlinedocs/install/.
 It refers to the current development sources, instructions for
 specific released versions are included with the sources.