autoconf.texi: Move ‘Systemology’ to ‘Portable Shell Programming’ section.

It’s not an ideal fit in this location, but it’s better here than
where it was (jammed in the middle of ‘Writing Tests’).

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 54d786f33b62a8f3911a157ea870e32ab05236b4..ad46411715bf31fa4f319ecc730cc81c3812bd0e 100644 (file)
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -425,7 +425,6 @@ Writing Tests
 * Running the Compiler::        Detecting language or header features
 * Running the Linker::          Detecting library features
 * Runtime::                     Testing for runtime features
-* Systemology::                 A zoology of operating systems
 * Multiple Cases::              Tests for several possible values
 
 Writing Test Programs
@@ -507,6 +506,7 @@ Dependencies Between Macros
 
 Portable Shell Programming
 
+* Systemology::                 A zoology of operating systems
 * Shellology::                  A zoology of shells
 * Invoking the Shell::          Invoking the shell as a command
 * Here-Documents::              Quirks and tricks
@@ -9191,7 +9191,6 @@ software package, the best thing to do is encapsulate it in a new macro.
 * Running the Compiler::        Detecting language or header features
 * Running the Linker::          Detecting library features
 * Runtime::                     Testing for runtime features
-* Systemology::                 A zoology of operating systems
 * Multiple Cases::              Tests for several possible values
 @end menu
 
@@ -9977,75 +9976,6 @@ AC_RUN_IFELSE(
 @end example
 
 
-@node Systemology
-@section Systemology
-@cindex Systemology
-
-This section aims at presenting some systems and pointers to
-documentation.  It may help you addressing particular problems reported
-by users.
-
-@uref{https://@/en.wikipedia.org/@/wiki/@/POSIX, Posix-conforming
-systems} are derived from the
-@uref{https://@/en.wikipedia.org/@/wiki/@/Unix, Unix operating system}.
-
-The @uref{http://@/bhami.com/@/rosetta.html, Rosetta Stone for Unix}
-contains a table correlating the features of various Posix-conforming
-systems.  @uref{https://@/www.levenez.com/@/unix/, Unix History} is a
-simplified diagram of how many Unix systems were derived from each
-other.
-
-@uref{http://@/heirloom.sourceforge.net/, The Heirloom Project}
-provides some variants of traditional implementations of Unix utilities.
-
-@table @asis
-@item Darwin
-@cindex Darwin
-@cindex macOS
-@cindex Mac OS X
-Darwin is a partially proprietary operating system maintained by Apple
-Computer and used by most of their products.  It is also known as macOS,
-iOS, etc.@: depending on the exact variant.  Older versions were called
-``Mac OS X'', the X being intended as the Roman numeral for 10.
-
-It is derived from FreeBSD, but presents some unusual portability
-hazards.  Most importantly, by default the filesystem will be case
-insensitive, albeit case preserving.  This can cause nasty problems:
-for instance, the installation attempt for a package having an
-@file{INSTALL} file can result in @samp{make install} reporting that
-nothing is to be done!
-
-Darwin does support case-sensitive file systems, but they must be
-formatted specially as such, and Apple discourages use of a
-case-sensitive volume for the base operating system.  To build software
-that expects case-sensitive filenames, it is best to create a separate
-disk volume or disk image formatted as case sensitive; this can be done
-using the @command{diskutil} command or the Disk Utility application.
-
-@item QNX 4.25
-@cindex QNX 4.25
-@c FIXME: Please, if you feel like writing something more precise,
-@c it'd be great.  In particular, I can't understand the difference with
-@c QNX Neutrino.
-QNX is a realtime operating system running on Intel architecture
-meant to be scalable from the small embedded systems to the hundred
-processor super-computer.  It claims to be Posix certified.  More
-information is available on the
-@uref{https://@/blackberry.qnx.com/@/en, QNX home page}.
-
-@item Unix version 7
-@cindex Unix version 7
-@cindex V7
-Officially this was called the ``Seventh Edition'' of ``the UNIX
-time-sharing system'' but we use the more-common name ``Unix version 7''.
-Documentation is available in the
-@uref{https://@/s3.amazonaws.com/@/plan9-bell-labs/@/7thEdMan/@/index.html,
-Unix Seventh Edition Manual}.
-Previous versions of Unix are called ``Unix version 6'', etc., but
-they were not as widely used.
-@end table
-
-
 @node Multiple Cases
 @section Multiple Cases
 
@@ -15542,6 +15472,7 @@ subset described above, is fairly portable nowadays.  Also please see
 @uref{http://@/www.faqs.org/@/faqs/@/unix-faq/@/shell/, the Shell FAQs}.
 
 @menu
+* Systemology::                 A zoology of operating systems
 * Shellology::                  A zoology of shells
 * Invoking the Shell::          Invoking the shell as a command
 * Here-Documents::              Quirks and tricks
@@ -15559,6 +15490,76 @@ subset described above, is fairly portable nowadays.  Also please see
 * Limitations of Usual Tools::  Portable use of portable tools
 @end menu
 
+
+@node Systemology
+@section Systemology
+@cindex Systemology
+
+This section aims at presenting some systems and pointers to
+documentation.  It may help you addressing particular problems reported
+by users.
+
+@uref{https://@/en.wikipedia.org/@/wiki/@/POSIX, Posix-conforming
+systems} are derived from the
+@uref{https://@/en.wikipedia.org/@/wiki/@/Unix, Unix operating system}.
+
+The @uref{http://@/bhami.com/@/rosetta.html, Rosetta Stone for Unix}
+contains a table correlating the features of various Posix-conforming
+systems.  @uref{https://@/www.levenez.com/@/unix/, Unix History} is a
+simplified diagram of how many Unix systems were derived from each
+other.
+
+@uref{http://@/heirloom.sourceforge.net/, The Heirloom Project}
+provides some variants of traditional implementations of Unix utilities.
+
+@table @asis
+@item Darwin
+@cindex Darwin
+@cindex macOS
+@cindex Mac OS X
+Darwin is a partially proprietary operating system maintained by Apple
+Computer and used by most of their products.  It is also known as macOS,
+iOS, etc.@: depending on the exact variant.  Older versions were called
+``Mac OS X'', the X being intended as the Roman numeral for 10.
+
+It is derived from FreeBSD, but presents some unusual portability
+hazards.  Most importantly, by default the filesystem will be case
+insensitive, albeit case preserving.  This can cause nasty problems:
+for instance, the installation attempt for a package having an
+@file{INSTALL} file can result in @samp{make install} reporting that
+nothing is to be done!
+
+Darwin does support case-sensitive file systems, but they must be
+formatted specially as such, and Apple discourages use of a
+case-sensitive volume for the base operating system.  To build software
+that expects case-sensitive filenames, it is best to create a separate
+disk volume or disk image formatted as case sensitive; this can be done
+using the @command{diskutil} command or the Disk Utility application.
+
+@item QNX 4.25
+@cindex QNX 4.25
+@c FIXME: Please, if you feel like writing something more precise,
+@c it'd be great.  In particular, I can't understand the difference with
+@c QNX Neutrino.
+QNX is a realtime operating system running on Intel architecture
+meant to be scalable from the small embedded systems to the hundred
+processor super-computer.  It claims to be Posix certified.  More
+information is available on the
+@uref{https://@/blackberry.qnx.com/@/en, QNX home page}.
+
+@item Unix version 7
+@cindex Unix version 7
+@cindex V7
+Officially this was called the ``Seventh Edition'' of ``the UNIX
+time-sharing system'' but we use the more-common name ``Unix version 7''.
+Documentation is available in the
+@uref{https://@/s3.amazonaws.com/@/plan9-bell-labs/@/7thEdMan/@/index.html,
+Unix Seventh Edition Manual}.
+Previous versions of Unix are called ``Unix version 6'', etc., but
+they were not as widely used.
+@end table
+
+
 @node Shellology
 @section Shellology
 @cindex Shellology