I got following error: if gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../include -g -O -DDBUG_ON -DSAFE_MUTEX -Wimplicit -Wreturn-type -Wswitch -Wtrigraphs -Wcomment -W -Wchar-subscripts -Wformat -Wparentheses -Wsign-compare -Wwrite-strings -Wunused -mcpu=pentiumpro -DUNIV_MUST_NOT_INLINE -DEXTRA_DEBUG -DFORCE_INIT_OF_VARS -DSAFEMALLOC -DPEDANTIC_SAFEMALLOC -DSAFE_MUTEX -O1 -Wuninitialized -MT bchange.o -MD -MP -MF ".deps/bchange.Tpo" \ -c -o bchange.o `test -f 'bchange.c' || echo './'`bchange.c; \ then mv -f ".deps/bchange.Tpo" ".deps/bchange.Po"; \ else rm -f ".deps/bchange.Tpo"; exit 1; \ fi In file included from /usr/include/asm/percpu.h:4, from /usr/include/asm/processor.h:22, from /usr/include/asm/atomic.h:6, from ../include/my_global.h:291, from bfill.c:32: /usr/include/asm-generic/percpu.h:8: error: `CONFIG_NR_CPUS' undeclared here (not in a function) Returning to old kernel & headers remove problem Steps to Reproduce: 1. get mysql bk tree 5.0 (here is more details http://dev.mysql.com/doc/mysql/en/Installing_source_tree.html) 2. run build script ./BUILD/compile-pentium-debug 3.
reassign
In general, including kernel headers from userspace is wrong - headers from the glibc-kernheaders package should be used for compilation. #include <asm/atomic.h> should not be used in userspace for several reasons: 1) On some architectures the atomic operations from <asm/atomic.h> are not available in user mode: e.g., see sparc, sparc64 - atomic_* functions are not implemented as inlines; on some other architectures the required instructions are privileged - see http://mailman.uclinux.org/pipermail/uclinux-dev/2004-January/023757.html . 2) Even on i386 the result of compilation depends on the kernel configuration: if the kernel was not configured as SMP, the lock prefix before instruction is omitted, therefore the compiled code will not be SMP-safe, creating subtle bugs.
