Hello, with gcc-4.4 from trunk (tested on revisions 140300 and 141769) I get internal error while building kernel from git.
It happen after this commit to linux-2.6.git tree http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d6c88a507ef0b6afdb013cba4e7804ba7324d99a gcc-4.3 revision 141421 works good Steps for reproduce Checkout linux-2.6.git from git.kernel.org run with optimisation higher then zero or with -Os gcc-4.4.0-pre9999 -O1 -D__KERNEL__ -Iinclude -I/usr/src/linux-2.6/arch/x86/include -include include/linux/autoconf.h -Iinclude/asm-x86/mach-default -c -o arch/x86/kernel/.tmp_setup_percpu.o arch/x86/kernel/setup_percpu.c Error message: CC arch/x86/kernel/setup_percpu.o arch/x86/kernel/setup_percpu.c: In function setup_per_cpu_areas: arch/x86/kernel/setup_percpu.c:194: error: unrecognizable insn: (insn 64 63 65 8 arch/x86/kernel/setup_percpu.c:154 (set (reg:DI 100) (const:DI (plus:DI (minus:DI (symbol_ref:DI ("__per_cpu_end") [flags 0x40] <var_decl 0x2b184a5a11e0 __per_cpu_end>) (symbol_ref:DI ("__per_cpu_start") [flags 0x40] <var_decl 0x2b184a5a1140 __per_cpu_start>)) (const_int 12287 [0x2fff])))) -1 (nil)) arch/x86/kernel/setup_percpu.c:194: internal compiler error: in extract_insn, at recog.c:2027 Please submit a full bug report, with preprocessed source if appropriate. See <http://bugs.gentoo.org/> for instructions. make[1]: *** [arch/x86/kernel/setup_percpu.o] Error 1 make: *** [arch/x86/kernel] Error 2 -- Summary: Internal compiler error: in extract_insn while building linux-kernel from git with -Os or -O1 and higher Product: gcc Version: 4.4.0 Status: UNCONFIRMED Severity: major Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: martin dot jansa at mk dot cvut dot cz http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38090
