Update install.texi documentation of uses of Perl and Python.

The install.texi documentation of uses of Perl and Python is
substantially out of date.

The description of Perl is "to test the installation" (which I
interpret as referring to test-installation.pl), but it's used for
more tests than that, and to build the manual, and to regenerate one
file in the source tree.

The description of Python is only for pretty-printer tests, but it's
used for other tests / benchmarks as well (and for other internal uses
such as updating Unicode data, for which we already require Python 3,
but I think install.texi only needs to describe uses from the main
glibc Makefiles).

This patch updates the descriptions of what those tools are used for.
The Python information (and information about other tools for testing
pretty printers) was awkwardly in the middle of the general
description of building and testing glibc, rather than with the rest
of information about tools used in glibc build and test; this patch
moves the information about those tools into the main list.

Tested with regeneration of INSTALL as well as "make info" and "make
pdf".

	* manual/install.texi (Configuring and compiling): Do not list
	tools used for testing pretty printers here.
	(Tools for Compilation): List Python, PExpect and GDB here.
	Update descriptions of uses of Perl and Python.
	* INSTALL: Regenerate.

3 files changed, 70 insertions, 73 deletions

diff --git a/ChangeLog b/ChangeLog
index 87e467c..620ef46 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2018-08-13  Joseph Myers  <joseph@codesourcery.com>
 
+	* manual/install.texi (Configuring and compiling): Do not list
+	tools used for testing pretty printers here.
+	(Tools for Compilation): List Python, PExpect and GDB here.
+	Update descriptions of uses of Perl and Python.
+	* INSTALL: Regenerate.
+
 	* scripts/build-many-glibcs.py (Context.checkout): Default Linux
 	version to 4.18.
 
diff --git a/INSTALL b/INSTALL
index b677261..603b23b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -296,38 +296,6 @@ You can specify 'stop-on-test-failure=y' when running 'make check' to
 make the test run stop and exit with an error status immediately when a
 failure occurs.
 
-   The GNU C Library pretty printers come with their own set of scripts
-for testing, which run together with the rest of the testsuite through
-'make check'.  These scripts require the following tools to run
-successfully:
-
-   * Python 2.7/3.4 or later
-
-     Python is required for running the printers' test scripts.  As of
-     release time, Python 3.6 is the newest verified to work to test the
-     pretty printers.
-
-   * PExpect 4.0
-
-     The printer tests drive GDB through test programs and compare its
-     output to the printers'.  PExpect is used to capture the output of
-     GDB, and should be compatible with the Python version in your
-     system.  As of release time PExpect 4.3 is the newest verified to
-     work to test the pretty printers.
-
-   * GDB 7.8 or later with support for Python 2.7/3.4 or later
-
-     GDB itself needs to be configured with Python support in order to
-     use the pretty printers.  Notice that your system having Python
-     available doesn't imply that GDB supports it, nor that your
-     system's Python and GDB's have the same version.  As of release
-     time GNU 'debugger' 8.0.1 is the newest verified to work to test
-     the pretty printers.
-
-If these tools are absent, the printer tests will report themselves as
-'UNSUPPORTED'.  Notice that some of the printer tests require the GNU C
-Library to be compiled with debugging symbols.
-
    To format the 'GNU C Library Reference Manual' for printing, type
 'make dvi'.  You need a working TeX installation to do this.  The
 distribution builds the on-line formatted version of the manual, as Info
@@ -532,10 +500,11 @@ build the GNU C Library:
 
    * Perl 5
 
-     Perl is not required, but it is used if present to test the
-     installation.  We may decide to use it elsewhere in the future.  As
-     of release time 'perl' version 5.28.0 is the newest verified to
-     work to build the GNU C Library.
+     Perl is not required, but if present it is used in some tests and
+     the 'mtrace' program, to build the GNU C Library manual, as well as
+     to regenerate 'locale/C-translit.h' if its source files are
+     modified.  As of release time 'perl' version 5.28.0 is the newest
+     verified to work to build the GNU C Library.
 
    * GNU 'sed' 3.02 or newer
 
@@ -543,6 +512,33 @@ build the GNU C Library:
      work with any version of 'sed'.  As of release time, 'sed' version
      4.5 is the newest verified to work to build the GNU C Library.
 
+   * Python 2.7/3.4 or later
+
+     Python is required to run some tests.  As of release time, Python
+     3.6 is the newest verified to work for testing the GNU C Library.
+
+   * PExpect 4.0
+
+     The pretty printer tests drive GDB through test programs and
+     compare its output to the printers'.  PExpect is used to capture
+     the output of GDB, and should be compatible with the Python version
+     in your system.  As of release time PExpect 4.3 is the newest
+     verified to work to test the pretty printers.
+
+   * GDB 7.8 or later with support for Python 2.7/3.4 or later
+
+     GDB itself needs to be configured with Python support in order to
+     use the pretty printers.  Notice that your system having Python
+     available doesn't imply that GDB supports it, nor that your
+     system's Python and GDB's have the same version.  As of release
+     time GNU 'debugger' 8.0.1 is the newest verified to work to test
+     the pretty printers.
+
+     Unless Python, PExpect and GDB with Python support are present, the
+     printer tests will report themselves as 'UNSUPPORTED'.  Notice that
+     some of the printer tests require the GNU C Library to be compiled
+     with debugging symbols.
+
 If you change any of the 'configure.ac' files you will also need
 
    * GNU 'autoconf' 2.69 (exactly)
diff --git a/manual/install.texi b/manual/install.texi
index f9cc190..df32b39 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -330,39 +330,6 @@ occurred.  You can specify @samp{stop-on-test-failure=y} when running
 @code{make check} to make the test run stop and exit with an error
 status immediately when a failure occurs.
 
-The @glibcadj{} pretty printers come with their own set of scripts for testing,
-which run together with the rest of the testsuite through @code{make check}.
-These scripts require the following tools to run successfully:
-
-@itemize @bullet
-@item
-Python 2.7/3.4 or later
-
-Python is required for running the printers' test scripts. As of release time,
-Python 3.6 is the newest verified to work to test the pretty printers.
-
-@item PExpect 4.0
-
-The printer tests drive GDB through test programs and compare its output
-to the printers'.  PExpect is used to capture the output of GDB, and should be
-compatible with the Python version in your system. As of release time
-PExpect 4.3 is the newest verified to work to test the pretty printers.
-
-@item
-GDB 7.8 or later with support for Python 2.7/3.4 or later
-
-GDB itself needs to be configured with Python support in order to use the
-pretty printers.  Notice that your system having Python available doesn't imply
-that GDB supports it, nor that your system's Python and GDB's have the same
-version. As of release time GNU @code{debugger} 8.0.1 is the newest verified
-to work to test the pretty printers.
-@end itemize
-
-@noindent
-If these tools are absent, the printer tests will report themselves as
-@code{UNSUPPORTED}.  Notice that some of the printer tests require @theglibc{}
-to be compiled with debugging symbols.
-
 To format the @cite{GNU C Library Reference Manual} for printing, type
 @w{@code{make dvi}}.  You need a working @TeX{} installation to do
 this.  The distribution builds the on-line formatted version of the
@@ -577,10 +544,11 @@ verified to work to build @theglibc{}.
 @item
 Perl 5
 
-Perl is not required, but it is used if present to test the
-installation.  We may decide to use it elsewhere in the future. As of release
-time @code{perl} version 5.28.0 is the newest verified to work to build
-@theglibc{}.
+Perl is not required, but if present it is used in some tests and the
+@code{mtrace} program, to build the @glibcadj{} manual, as well as to
+regenerate @file{locale/C-translit.h} if its source files are
+modified.  As of release time @code{perl} version 5.28.0 is the newest
+verified to work to build @theglibc{}.
 
 @item
 GNU @code{sed} 3.02 or newer
@@ -589,6 +557,33 @@ GNU @code{sed} 3.02 or newer
 with any version of @code{sed}.  As of release time, @code{sed} version
 4.5 is the newest verified to work to build @theglibc{}.
 
+@item
+Python 2.7/3.4 or later
+
+Python is required to run some tests.  As of release time, Python 3.6
+is the newest verified to work for testing @theglibc{}.
+
+@item PExpect 4.0
+
+The pretty printer tests drive GDB through test programs and compare
+its output to the printers'.  PExpect is used to capture the output of
+GDB, and should be compatible with the Python version in your system.
+As of release time PExpect 4.3 is the newest verified to work to test
+the pretty printers.
+
+@item
+GDB 7.8 or later with support for Python 2.7/3.4 or later
+
+GDB itself needs to be configured with Python support in order to use
+the pretty printers.  Notice that your system having Python available
+doesn't imply that GDB supports it, nor that your system's Python and
+GDB's have the same version.  As of release time GNU @code{debugger}
+8.0.1 is the newest verified to work to test the pretty printers.
+
+Unless Python, PExpect and GDB with Python support are present, the
+printer tests will report themselves as @code{UNSUPPORTED}.  Notice
+that some of the printer tests require @theglibc{} to be compiled with
+debugging symbols.
 @end itemize
 
 @noindent