[PATCHv2] Make SIG2STR_MAX usable in #if

[Mingye Wang <arthur200126@gmail.com>]

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> That should be 7 + 11 - 1 = 17 and 7 + 6 - 1 = 12, shouldn't it?

Yep, it should be. Misread my terminal output and wondered for a bit
why the second one is longer than the first. Should have thought about
double-checking.

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From bccdc7d72cc1ea8a0d2aa04acf86e0afd2a3d6b5 Mon Sep 17 00:00:00 2001
From: Mingye Wang <arthur200126@gmail.com>
Date: Wed, 21 Jun 2023 20:11:57 +0800
Subject: [PATCH] Make SIG2STR_MAX usable in #if

The text accepted for POSIX issue 8 requires that SIG2STR_MAX be usable
in #if, which we currently break with sizeof. Use static values instead.
---
 newlib/libc/include/sys/signal.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/newlib/libc/include/sys/signal.h b/newlib/libc/include/sys/signal.h
index 8dc5fb9c34..96bf9781ae 100644
--- a/newlib/libc/include/sys/signal.h
+++ b/newlib/libc/include/sys/signal.h
@@ -245,9 +245,9 @@ int sigqueue (pid_t, int, const union sigval);
 /* POSIX Issue 8 adds sig2str() and str2sig() */
 
 #if __SIZEOF_INT__ >= 4
-#define SIG2STR_MAX (sizeof("RTMAX+") + sizeof("4294967295") - 1)
+#define SIG2STR_MAX 17	/* (sizeof("RTMAX+") + sizeof("4294967295") - 1) */
 #else
-#define SIG2STR_MAX (sizeof("RTMAX+") + sizeof("65535") - 1)
+#define SIG2STR_MAX 12	/* (sizeof("RTMAX+") + sizeof("65535") - 1) */
 #endif
 
 int sig2str(int, char *);