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On 18 Nov 2003, Ned Ludd wrote: |
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> On Tue, 2003-11-18 at 18:57, Peter S. Mazinger wrote: |
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> > Hello! |
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> > |
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> > I have a clean uClibc environment (not gentoo based), and inspired by |
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> > hardened-gcc-3.3.2 the gcc specs file was changed to support ET_DYN |
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> > binaries, the only change I have done is replacing Scrt1.o with "crt1S.o |
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> > interp.o" (crt1S.o not yet in the uClibc tree, but in portage), due to the |
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> > fact that Scrt1.o does not exist in uClibc like in glibc-2.3.2. I do not |
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> > know what the difference is between Scrt1.o from glibc and crt1S.o coming |
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> > from the hardened-gcc-2.4.6 (the version for uClibc is PaX version, so |
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> > similar to those in hardened-gcc-2.4.6). |
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> > Could someone comment on problems regarding this change? |
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> ... |
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> |
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> > I have seen a dependency on binutils-2.14.90.0.7, but this one has some |
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> > problems with uClibc (does not correctly support canadian cross-compiling, |
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> > binutils-2.14.90.0.6 yes). Is it really needed, or is |
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> > binutils-2.14.90.0.6-r7 enough? |
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> > |
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> > I have rebuilt about 50 packages (mainly development environment) with |
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> > these changes, but there is some strange behaviour (it is not related |
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> > to the fact that everything is -fPIC built, I had this already defined |
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> > earlier in my CFLAGS for almost all packages) |
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> > I am also interested in an Scrt1.o version for uClibc, so a changes |
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> > description between the PaX and the glibc-2.3.2 implementation would be |
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> > helpful. |
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> |
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> <rant> |
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> Quick rundown. Sctr1.S is a redhat knock off creation of PaX's ctr1S.S |
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> (ie somebody probably got paid to rip it off and claim it was a redhat |
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> original creation) they even fscked up the naming convention. I wont go |
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> to much in detail because I would end up ranting for hours. In short |
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> Scrt1 the way it gets built by redhat will most likely end up with text |
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> relocations from what I understand so the PaX crt1S.S should be used and |
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> preferred till such time as redhat finds a way to break that for us. |
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> </rant> |
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Why is then used Scrt1.o in hardened-gcc-3.3.2? |
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> |
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> > Why was the default -fomit-frame-pointer option removed? From my |
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> > experience there are only a few packages, that are incompatible with it |
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> > (mainly libraries). |
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> |
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> You would have to ask the maintainer pappy@g.o about why this |
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> functionality was removed. However I can say from my personal testing we |
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> truly don't seem to gain any performance by trying to gain back an extra |
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> register from adding -fomit-frame-pointer when -fPIC steals away the ebx |
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> register, in fact I even get roughly exactly same number of instructions |
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> that get executed when using those flags together. Attached is a file I |
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> did this testing with. |
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> |
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> |
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-- |
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Peter S. Mazinger <ps.m@×××.net> ID: 0xA5F059F2 NIC: IXUYHSKQLI |
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Key fingerprint = 92A4 31E1 56BC 3D5A 2D08 BB6E C389 975E A5F0 59F2 |
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