Red Hat Bugzilla – Bug 511183
kernel: build with -fno-delete-null-pointer-checks [rhel-4.9]
Last modified: 2011-02-16 10:38:42 EST
+++ This bug was initially created as a clone of Bug #511181 +++ Description of problem: http://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Optimize-Options.html -fdelete-null-pointer-checks Use global dataflow analysis to identify and eliminate useless checks for null pointers. The compiler assumes that dereferencing a null pointer would have halted the program. If a pointer is checked after it has already been dereferenced, it cannot be null. In some environments, this assumption is not true, and programs can safely dereference null pointers. Use -fno-delete-null-pointer-checks to disable this optimization for programs which depend on that behavior. Enabled at levels -O2, -O3, -Os.
Upstream commit: http://git.kernel.org/linus/a3ca86aea507904148870946d599e07a340b39bf
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
Committed in 89.10.EL . RPMS are available at http://people.redhat.com/vgoyal/rhel4/
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0263.html