#2662: gcc 4.5.0 -Os does not generate correct code
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Reporter: bdu...@… | Owner: lfs-b...@…
Type: defect | Status: new
Priority: high | Milestone: 6.7
Component: Book | Version: SVN
Severity: major | Keywords:
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I'm moving this from #2628 because it is a gcc issue.
I went though an svn build of the latest gcc-4.5 (svn revision (revision
159398) and the kernel segfaults when optimizing for size:
KBUILD_CFLAGS += -Os
Without this flag, the kernel boots fine. The issue may be limited to
x86_64.
With my configuration, the kernel is about 3.6M when optimized and about
4.1M without.
For a more detailed description of my experimentation, see
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44129
In the meantime there are a couple of options we have for lfs-svn:
1. Revert gcc to the latest gcc-4.4.x
2. Put a warning in the book not to optimize for size. AFAIK, the only
package that does that by default is the kernel.
3. Do nothing and wait for gcc to release a fix.
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Ticket URL: <http://wiki.linuxfromscratch.org/lfs/ticket/2662>
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