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-rw-r--r--main.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/main.c b/main.c
index 9c70c961..14c4ff71 100644
--- a/main.c
+++ b/main.c
@@ -137,8 +137,10 @@ void toy_exec(char *argv[])
if (!(which = toy_find(*argv))) return;
// Return if stack depth getting noticeable (proxy for leaked heap, etc).
- if (toys.stacktop && labs((char *)toys.stacktop-(char *)&which)>6000)
- return;
+
+ // Compiler writers have decided subtracting char * is undefined behavior,
+ // so convert to integers. (LP64 says sizeof(long)==sizeof(pointer).)
+ if (toys.stacktop && labs((long)toys.stacktop-(long)&which)>6000) return;
// Return if we need to re-exec to acquire root via suid bit.
if (toys.which && (which->flags&TOYFLAG_ROOTONLY) && toys.wasroot) return;