On Haiku I see the following warning:
test-strsignal.c:24:18: warning: initialization of 'char * (*)(int)' from
incompatible pointer type 'const char * (*)(int)' [-Wincompatible-pointer-types]
24 | SIGNATURE_CHECK (strsignal, char *, (int));
| ^~~~~~~~~
signature.h:46:57: note: in definition of macro 'SIGNATURE_CHECK2'
46 | _GL_UNUSED static ret (*signature_check ## id) args = fn
| ^~
signature.h:39:3: note: in expansion of macro 'SIGNATURE_CHECK1'
39 | SIGNATURE_CHECK1 (fn, ret, args, __LINE__)
| ^~~~~~~~~~~~~~~~
test-strsignal.c:24:1: note: in expansion of macro 'SIGNATURE_CHECK'
24 | SIGNATURE_CHECK (strsignal, char *, (int));
| ^~~~~~~~~~~~~~~
I don't think the missing const is worth a workaround, so I have
disabled the signature check and documented the bug.
Reported to Haiku in case they want to comply with POSIX [1].
Collin
[1] https://dev.haiku-os.org/ticket/19537
>From b05d9ebbc823972f568107c4ed9b79c6dfae496c Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.fu...@gmail.com>
Date: Mon, 21 Apr 2025 20:35:08 -0700
Subject: [PATCH] strsignal tests: Disable signature check on Haiku.
* tests/test-strsignal.c [__HAIKU__]: Skip signature check.
* doc/posix-functions/strsignal.texi: Document that strsignal returns
'const char *' instead of 'char *' on Haiku.
---
ChangeLog | 5 +++++
doc/posix-functions/strsignal.texi | 3 ++-
tests/test-strsignal.c | 2 ++
3 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index 69b6fd7a8d..89250b7739 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
2025-04-21 Collin Funk <collin.fu...@gmail.com>
+ strsignal tests: Disable signature check on Haiku.
+ * tests/test-strsignal.c [__HAIKU__]: Skip signature check.
+ * doc/posix-functions/strsignal.texi: Document that strsignal returns
+ 'const char *' instead of 'char *' on Haiku.
+
getloadavg: Fix typo in previous commit.
* lib/getloadavg.c (getloadavg): Remove '__' prefix from 'defined'.
diff --git a/doc/posix-functions/strsignal.texi b/doc/posix-functions/strsignal.texi
index 23881cf1b3..10bfdc519e 100644
--- a/doc/posix-functions/strsignal.texi
+++ b/doc/posix-functions/strsignal.texi
@@ -28,5 +28,6 @@ @node strsignal
@itemize
@item This function returns @code{const char *} instead of @code{char *} on
some platforms:
-cygwin 1.5.25.
+@c https://dev.haiku-os.org/ticket/19537
+cygwin 1.5.25, Haiku.
@end itemize
diff --git a/tests/test-strsignal.c b/tests/test-strsignal.c
index 4ed4cc3e23..21f0e956fa 100644
--- a/tests/test-strsignal.c
+++ b/tests/test-strsignal.c
@@ -21,7 +21,9 @@
#include <string.h>
#include "signature.h"
+#if !defined __HAIKU__
SIGNATURE_CHECK (strsignal, char *, (int));
+#endif
#include <signal.h>
--
2.49.0
