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[PATCH] doc: note that $(wildcard) is implemented in terms of glob(3)

From: Ævar Arnfjörð Bjarmason
Subject: [PATCH] doc: note that $(wildcard) is implemented in terms of glob(3)
Date: Fri, 3 Dec 2021 11:08:21 +0100

The $subject isn't strictly true, as the it's implemented in terms of
MatchFirst() on Amiga, but that's obscure enough to not be noted in
the manual, and in any case the tests added in 0d366b66 (* Added the
test suite to the main distribution., 1999-09-14) show that the output
is sorted on all platforms GNU make has been tested on.

The motivation for this patch is that I've seen code like this in the

    FILES = $(sort $(wildcard t*.sh))

I thought that it would be documented that that sort of thing was
redundant, but I didn't find any mention of it in the manual. After
some source spelunking I came up with this addition, which would have
helped me when I consulted the manual.

Aside: I found it difficult to figure out how to submit patches to
this project. The Savannah page suggests the bug tracker, but as af
writing (and I'm logged in, as "avar") that link appears greyed out in
the web interface, and has a <span class="disabled">.

 doc/make.texi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/make.texi b/doc/make.texi
index 4470386d..5cab7a9c 100644
--- a/doc/make.texi
+++ b/doc/make.texi
@@ -7664,6 +7664,12 @@ The argument @var{pattern} is a file name pattern, 
typically containing
 wildcard characters (as in shell file name patterns).  The result of
 @code{wildcard} is a space-separated list of the names of existing files
 that match the pattern.
+The @code{wildcard} function is implemented in terms of the system's
+@code{glob(3)} function (without a @code{GLOB_NOSORT} being
+provided). So there's no reason to @code{$(sort)} its output if the
+goal is to get output sorted in @code{glob(3)} order.
 @xref{Wildcards, ,Using Wildcard Characters in File Names}.
 @item $(realpath @var{names}@dots{})

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