I just tried to compile the Linux kernel 2.6.23.1
with the GNU C compiler version 4.3 snapshot 20071012
under valgrind.
valgrind said
gcc -Wp,-MD,scripts/genksyms/.genksyms.o.d -Wall -Wstrict-prototypes -O2
-fomit-frame-pointer -c -o scripts/genksyms/genksyms.o
scripts/genksyms/genksyms.c
==22718== Conditional jump or move depends on uninitialised value(s)
==22718== at 0xA7ECC3: global_conflicts (sparseset.h:90)
==22718== by 0xA52856: rest_of_handle_global_alloc (global.c:533)
==22718== by 0x643328: execute_one_pass (passes.c:1117)
==22718== by 0x6434FF: execute_pass_list (passes.c:1170)
==22718== by 0x643514: execute_pass_list (passes.c:1171)
==22718== by 0x71EA9F: tree_rest_of_compilation (tree-optimize.c:404)
==22718== by 0x89B7E1: cgraph_expand_function (cgraphunit.c:1060)
==22718== by 0x89DC4B: cgraph_optimize (cgraphunit.c:1123)
==22718== by 0x4160CD: c_write_global_declarations (c-decl.c:8077)
==22718== by 0x6C41DF: toplev_main (toplev.c:1052)
==22718== by 0x52BAAE3: (below main) (in /lib64/libc-2.5.so)
==22718==
Preprocessed source code attached. Flag -O2 required.
--
Summary: valgrind error with -O2 for linux kernel code
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dcb314 at hotmail dot com
GCC host triplet: sue-linux-x86_64
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33796
