From 74c7b31d5236ebf763b0808c07d66be9b79756e1 Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Mon, 11 Oct 2004 00:10:28 +0000 Subject: [PATCH] Mention that GCC reorders statements. --- doc/debug.texi | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/doc/debug.texi b/doc/debug.texi index 82f001f..19270f4 100644 --- a/doc/debug.texi +++ b/doc/debug.texi @@ -201,7 +201,15 @@ address. (Use a @samp{0x} prefix to specify an address in hex.) @end table -If you notice unexplainable behavior while using @command{gdb}, there +You might notice that @command{gdb} tends to show code being executed +in an order different from the order in the source. That is, the +current statement jumps around seemingly randomly. This is due to +GCC's optimizer, which does tend to reorder code. If it bothers you, +you can turn off optimization by editing +@file{pintos/src/Make.config}, removing @option{-O3} from the +@code{CFLAGS} definition. + +If you notice other strange behavior while using @command{gdb}, there are three possibilities. The first is that there is a bug in your modified Pintos. The second is that there is a bug in Bochs's interface to @command{gdb} or in @command{gdb} itself. The third is -- 2.30.2