Re: Link-time failures from "simple" CFLAGS changes

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linuxppc-dev  writes:

When I change -O2 to -O0 in my CFLAGS definition in Makefile thus:

CFLAGS := -g $(CPPFLAGS) -Wall -Wstrict-prototypes -Wno-trigraphs -O0 \
-fno-strict-aliasing -fno-common

CFLAGS := -g $(CPPFLAGS) -Wall -Wstrict-prototypes -Wno-trigraphs -O2 \
-fno-strict-aliasing -fno-common

...I am astounded to see thousands of unresolved references
at kernel link time.  WTF?  Any ideas?

	GCC only inlines functions when optimizing and the Linux kernel
assumes inlining and other optimizations only present at -O2.  The Linux
kernel requires optimization at least, and only really is tested at -O2.

David


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