gcc optimization flag breakdown

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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.

Thanks,

--Nathan


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