Merge from origin/emacs-27

b4937f64cd (origin/emacs-27) Improve documentation of manually instal...
efd4e973a4 Reflect the emacs-devel ELPA/MELPA dispute in FAQ
28541674cd Consider face inheritance when checking region face backgr...
e75f6be6cc Fix dired default file operation (bug#41261)
406fb0746c Fix documentation related to 'command-switch-alist'.
747e0a2523 Improve ediff readability in misterioso theme (Bug#41221)
48830c73e7 Fix a crash in handle_display_spec
a37290a6f9 In x_hide_tip reset tip_last_frame for GTK+ tooltips only ...
3d81995692 Fix docstring of flymake-make-diagnostic (bug#40351)
632aa9d57a Go back to “Bahá’í”
e2406ff60f * lisp/dired.el (dired-toggle-marks): Doc fix.  (Bug#41097)

# Conflicts:
#	doc/emacs/building.texi

1 files changed, 9 insertions, 1 deletions

diff --git a/doc/lispref/os.texi b/doc/lispref/os.texi
index 8bf48b1dbba..8f2c7439d9f 100644
--- a/doc/lispref/os.texi
+++ b/doc/lispref/os.texi
@@ -613,7 +613,7 @@ The elements of the @code{command-switch-alist} look like this:
 @end example
 
 The @sc{car}, @var{option}, is a string, the name of a command-line
-option (not including the initial hyphen).  The @var{handler-function}
+option (including the initial hyphen).  The @var{handler-function}
 is called to handle @var{option}, and receives the option name as its
 sole argument.
 
@@ -623,6 +623,14 @@ remaining command-line arguments in the variable
 @code{command-line-args-left} (see below).  (The entire list of
 command-line arguments is in @code{command-line-args}.)
 
+Note that the handling of @code{command-switch-alist} doesn't treat
+equals signs in @var{option} specially.  That is, if there's an option
+like @code{--name=value} on the command line, then only a
+@code{command-switch-alist} member whose @code{car} is literally
+@code{--name=value} will match this option.  If you want to parse such
+options, you need to use @code{command-line-functions} instead (see
+below).
+
 The command-line arguments are parsed by the @code{command-line-1}
 function in the @file{startup.el} file.  See also @ref{Emacs
 Invocation, , Command Line Arguments for Emacs Invocation, emacs, The