X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=handy.h;h=8586a25ee4095d2b98a1b29a9a50f7c221f3288d;hb=b2a156bd8e464af88881c77344280160fd844dcf;hp=f88af3ea57eeb1eaf18ee6e0f175451640613fc3;hpb=7b4e746973783c054fecf3c05862fea4b7fd94cd;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/handy.h b/handy.h
index f88af3e..8586a25 100644
--- a/handy.h
+++ b/handy.h
@@ -681,10 +681,13 @@ PoisonWith(0xEF) for catching access to freed memory.
 #define NEWSV(x,len)	newSV(len)
 #endif
 
+/* The +0.0 in MEM_WRAP_CHECK_ is an attempt to foil
+ * overly eager compilers that will bleat about e.g.
+ * (U16)n > (size_t)~0/sizeof(U16) always being false. */
 #ifdef PERL_MALLOC_WRAP
 #define MEM_WRAP_CHECK(n,t) MEM_WRAP_CHECK_1(n,t,PL_memory_wrap)
 #define MEM_WRAP_CHECK_1(n,t,a) \
-	(void)(sizeof(t) > 1 && (MEM_SIZE)(n) > ((MEM_SIZE)~0)/sizeof(t) && (Perl_croak_nocontext(a),0))
+	(void)(sizeof(t) > 1 && ((MEM_SIZE)(n)+0.0) > ((MEM_SIZE)~0)/sizeof(t) && (Perl_croak_nocontext(a),0))
 #define MEM_WRAP_CHECK_(n,t) MEM_WRAP_CHECK(n,t),
 
 #define PERL_STRLEN_ROUNDUP(n) ((void)(((n) > (MEM_SIZE)~0 - 2 * PERL_STRLEN_ROUNDUP_QUANTUM) ? (Perl_croak_nocontext(PL_memory_wrap),0):0),((n-1+PERL_STRLEN_ROUNDUP_QUANTUM)&~((MEM_SIZE)PERL_STRLEN_ROUNDUP_QUANTUM-1)))