To-O0-g to compile the Linux kernel-Linux general technology-Linux programming and kernel information, the following is a detailed reading. To study the slub distribution in linux. compiled um for debugging. however, because the Linux kernel uses-O2 by default, the minimum requirement is-O1. when optimization is enabled, the source code will jump. I spent a few minutes solving this problem. you can modify the configuration in three places.
The first include/linux/compiler-gcc.h In the inline _ inline after these definitions have aways_inline attribute, to delete this attribute
In menuconfig, "Force gcc to inline functions marked inline" is not selected in kernel hack"
Of course, in the end, the-O2 in The Makefile should be deleted, that is, no optimization is needed for compilation (it seems that this time is-O0)
Then you can use make ARCH = um to compile the program successfully. I have compiled the simplified um for about 15 MB. (compile the kernel with debug info is selected)
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