Messages in this thread | | | Date | Thu, 04 Sep 2008 17:40:51 -0600 | From | Robert Hancock <> | Subject | Re: Building Kernel with -O0 |
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Keith A. Prickett wrote: > I was looking at some changes to the 2.6.26.y kernel in "compiler-gcc.h" > and had some questions. > ( http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.26.y.git;a=commitdiff;h=ae3a0064e6d69068b1c9fd075095da062430bda9 ) > > I was attempting to cross-compile Linux for a Marvell core with > Optimizations turned off and ran across an error due to the > __attribute__((always_inline)) attribute. > > It looks like the default behavior used to always have this feature on, > but Ingo committed some changes that allows this behavior to be turned > off (With the correct Kconfig file changes). > > I'm VERY new to Linux but was wondering if there was a way (config > option) to turn this inline attribute off in previous versions of the > kernel besides these new macros. It seems building with optimization > level 0 should be a natural thing for kernel driver developers to do for > debugging purposes. > > In summary: I want to compile with optimizations off and the compile is > failing now when I try this. How can this be resolved?
I don't think this has ever been supported. Even in current kernels where the compiler is not always forced to inline all functions, I believe there are some functions that need to be inlined and still use forced inlining, and if no optimizations are enabled, no inlining can be done.
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