Hi, I noticed that "./configure --enable-debug" will set "-O2" to CFLAGS. To better debug/trace the code, I have to manually change "-O2" to "-O0" in src/Makefile.global.
In the script "configure" line 5254 through 5259, I see this comment: # C[XX]FLAGS are selected so: # If the user specifies something in the environment, that is used. # else: If the template file set something, that is used. # else: If coverage was enabled, don't set anything. # else: If the compiler is GCC, then we use -O2. # else: If the compiler is something else, then we use -O, unless debugging. The last line, "unless debugging", my first impression is that should apply to GCC. However, the following code shows the GCC always use "-O2". elif test "$GCC" = yes; then CFLAGS="-O2" else # if the user selected debug mode, don't use -O if test "$enable_debug" != yes; then CFLAGS="-O" fi fi For GCC, we need to use "-O0" for best debugging experience. Why here always uses "-O2" for GCC regardless debugging? If confirmed a bug, I'd like a submit a patch to fix that. Thanks, Chao Li (Evan) ============ HighGo Inc.
