Avoid usage of PATH_MAX.

Submitted to bug-less@gnu.org.

From ef652341ed8b2c14ac40312ccd4ed329cb69fd0c Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Sat, 7 Mar 2020 14:57:19 +0100
Subject: [PATCH] Avoid usage of PATH_MAX.

* filename.c (lrealpath): Have realpath allocate the buffer.  Fixes
compilation on the Hurd and avoids possible buffer overflow on other
systems.
---
 filename.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/filename.c b/filename.c
index e420837..faa71b0 100644
--- a/filename.c
+++ b/filename.c
@@ -795,9 +795,9 @@ lrealpath(path)
 	char *path;
 {
 #if HAVE_REALPATH
-	char rpath[PATH_MAX];
-	if (realpath(path, rpath) != NULL)
-		return (save(rpath));
+	char *rpath = NULL;
+	if ((rpath = realpath(path, rpath)) != NULL)
+		return (rpath);
 #endif
 	return (save(path));
 }
-- 
2.24.0

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<tr><td><span title='2021-12-18 04:09:47 +0100'>2021-12-18</span></td><td><a href='/guix/commit/tests/cran.scm?id=10ceb3e84654e024f14a4b048e7d68492ed9dc7c'>import: cran: Fix description-&gt;package test.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-07-11 00:49:16 +0200'>2021-07-11</span></td><td><a href='/guix/commit/tests/cran.scm?id=aa6921634b4ea9988af0e37bfbb56780c431ef64'>import: cran: Emit new-style package inputs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-16 23:14:05 +0100'>2020-01-16</span></td><td><a href='/guix/commit/tests/cran.scm?id=cfd1ed84013df85f0e473884ef4038b4bd7120d4'>import: cran: Avoid uses of '@@' in the tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>