use cBOOL for bool casts

bool b = (bool)some_int

doesn't necessarily do what you think. In some builds, bool is defined as
char, and that cast's behaviour is thus undefined. So this line in mg.c:

    const bool was_temp = (bool)SvTEMP(sv);

was actually setting was_temp to false even when the SVs_TEMP flag was set.
Fix this by replacing all the (bool) casts with a new cBOOL() cast macro
that (hopefully) does the right thing.

1 files changed, 1 insertions, 1 deletions

diff --git a/toke.c b/toke.c
index b6735cfe49..b5236dadbf 100644
--- a/toke.c
+++ b/toke.c
@@ -13700,7 +13700,7 @@ S_utf16_textfilter(pTHX_ int idx, SV *sv, int maxlen)
     SV *const utf16_buffer = MUTABLE_SV(IoTOP_GV(filter));
     SV *const utf8_buffer = filter;
     IV status = IoPAGE(filter);
-    const bool reverse = (bool) IoLINES(filter);
+    const bool reverse = cBOOL(IoLINES(filter));
     I32 retval;
 
     /* As we're automatically added, at the lowest level, and hence only called