Nathan Thomas writes: > Hi all, > > ===> gcc 4.1.1 (release), AIX 5.3 > > What else does the -O1 flag turn on besides the options listed in the following > document? Is there any way to turn these on/off incrementally? > > http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Optimize-Options.html#Optimize-Options > > I'm trying to isolate the cause of excessively long compile times for a c++ code > when both debug information (-g) and any optimization level (O1/O2/O3) are enabled. > > The compile time is fine when I explicitly pass all the flags that -O1 is > documented to engage along with -g. However, it blows up (in the assembler, up > to 10x) when I call -O1 directly. Unless you use -O, you get no optimization. Turning the indivisual flags on does nothing. Andrew.
