commit - b32d9d9c2e07681450a7ea1801b07e5727fa39e2
commit + 34167aa6b0d7d53016b8574b4fe1fac764ddf615
blob - 9e3cb63ec060f5859dedb96bf4d89a5626e8e7fd
blob + 4155d88597e543f89a4371f78688a5f79771694d
--- src/lib9/fmt/sprint.c
+++ src/lib9/fmt/sprint.c
/*
* on PowerPC, the stack is near the top of memory, so
* we must be sure not to overflow a 32-bit pointer.
+ *
+ * careful! gcc-4.2 assumes buf+len < buf can never be true and
+ * optimizes the test away. casting to uintptr works around this bug.
*/
- if(buf+len < buf)
+ if((uintptr)buf+len < (uintptr)buf)
len = -(uintptr)buf-1;
va_start(args, fmt);