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lib9: gcc-4.2 bug in sprint

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This commit is contained in:
Russ Cox 2008-03-03 23:37:12 -05:00
parent b32d9d9c2e
commit 34167aa6b0
1 changed files with 4 additions and 1 deletions
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5
src/lib9/fmt/sprint.c
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@ -16,8 +16,11 @@ sprint(char *buf, char *fmt, ...)
/*
* 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);