From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 22 Aug 2018 23:11:58 +0000 (-0400)
Subject: fix FP_ILOGB0 and FP_ILOGBNAN definitions to be valid for use in #if
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=184ef36f85d66583306413727fc5f39557d391e4;p=musl

fix FP_ILOGB0 and FP_ILOGBNAN definitions to be valid for use in #if

commit 98c9af500125df41fdb46d7e384b00982d72493a wrongly claimed they
do not need to be valid for such usage, but the last sentence of C11
7.1.4 ¶1 imposes a broad requirement that all macros specified as
integer constant expressions also need to be valid for #if.

simply write the value out explicitly. there is no value here in
pretending that the width of int will vary.
---

diff --git a/include/math.h b/include/math.h
index 6ac91da2..fea34686 100644
--- a/include/math.h
+++ b/include/math.h
@@ -27,7 +27,7 @@ extern "C" {
 #define MATH_ERREXCEPT 2
 #define math_errhandling 2
 
-#define FP_ILOGBNAN (-1-(int)(((unsigned)-1)>>1))
+#define FP_ILOGBNAN (-1-0x7fffffff)
 #define FP_ILOGB0 FP_ILOGBNAN
 
 #define FP_NAN       0