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-fstack-protector and -fno-stack-protector-all security
options
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the utils using the uClibc-targeted toolchain.
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The attached patch generalizes the use of PIE (all archs are brought in
sync that use/mention it: x86/ppc/frv) and makes use of it building the
target utils.
Tested on x86, ppc should be tested, frv uses -fPIE at one location, but
at another place -fpie, I don't know which is correct (could be both) and
misses the target addition in Config.in.
The test for ppc (requires the earlier sent crt-correction patch to work
correctly):
enable UCLIBC_PIE_SUPPORT, build uClibc and utils, check:
file ./utils/ldd, it should show shared object (instead of executable)
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The attached patch is an updated version of an earlier sent patch
It solves the problem that the target utils (ldconfig/ldd/iconv, readelf
is not handled, but can be easily added) are not built w/ the newly
created [S]crt[01].o files.
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Always strip trailing slaches(/) from paths read from ld.so.conf.
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The attached patches make iconv use XXFLAGS and adapts ldd.host to cvs.
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dl-cache.h and make use of it. Also disables the lib-path-redundancy check
for the case the cache is not used. Makes use of _PRELOAD_FILE_SUPPORT.
From Peter Mazinger.
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Hello!
The attached patches remove unneeded -D<somedefine>, and uses instead
#ifdef __somedefine__
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Mazinger implements the changes suggested by me on the uclibc list.
On Tuesday 28 September 2004 02:24 pm, Erik Andersen wrote:
> What I think should be done is
>
> *) Someone that cares about USE_CACHE should fix that option
> up to be sure it works, and give it a proper config entry
> in extra/Configs/Config.in, and rename it to something
> more appropriate such as LDSO_CACHE_SUPPORT.
>
> *) When LDSO_CACHE_SUPPORT=n, UCLIBC_RUNTIME_PREFIX /usr/X11R6/lib
> should be included in the default library search path in
> dl-elf.c, ldd, and ldconfig.
>
> *) When LDSO_CACHE_SUPPORT=y, UCLIBC_RUNTIME_PREFIX /usr/X11R6/lib
> should be excluded from the default library search path in
> dl-elf.c, ldd, and ldconfig, and those wishing to include
> X11 stuff should add that into /etc/ld.so.conf and re-run
> ldconfig.
>
> *) At present, LDSO_CONF and LDSO_CACHE use the same names
> and same structure as glibc. This precludes
> LDSO_CACHE_SUPPORT being uses in any sane fashion on a
> dial glibc and uClibc system. Just as it was necessary
> for use to use a different name for 'libuClibc' rather
> than 'libc', and 'ld-uClibc.so.0' rather than
> 'ld-linux.so.2' it seems that these configuration files
> really ought to be given different names.
>
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Thanks to Peter Kjellerstedt.
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Search in UCLIBC_RUNTIME_PREFIX"lib" before
UCLIBC_RUNTIME_PREFIX"usr/lib".
X11 users should enable USE_CACHE in Rules.mak, add
/usr/X11R6/lib to /etc/ld.so.conf and run ldconfig.
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Move /lib and /usr/lib first in ld.so.cache.
Ignore duplicate /lib and /usr/lib in ld.so.conf
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while playing around with Gentoo on uClibc, i hit some troubles with ldconfig
first, i found that it kept trying to read 'etc/ld.so.conf' ... it didnt want
to read '/etc/ld.so.conf' ... looking at the source, the default conf file is
defined as UCLIBC_RUNTIME_PREFIX "etc/ld.so.conf" ... all fine and dandy, but
the utils/Makefile builds the .c files with this:
-DUCLIBC_RUNTIME_PREFIX=$(R_PREFIX)
i couldnt find where R_PREFIX was defined/used anywhere else, but i did find
that every other time UCLIBC_RUNTIME_PREFIX was defined, it was set like:
-DUCLIBC_RUNTIME_PREFIX=\"$(RUNTIME_PREFIX)\"
changing the utils/Makefile to be like this fixed things for me
next up, i found that i wasnt getting an /etc/ld.so.cache file when i ran
`ldconfig` ... looking at the code, USE_CACHE needs to be defined ...
Rules.mak has a line that reads LIBRARY_CACHE:=#-DUSE_CACHE by default, but
then LIBRARY_CACHE is never used anywhere :)
so the fix here is to add $(LIBRARY_CACHE) to the lines in utils/Makefile
where the .c files are compiled
perhaps a suggestion then ? in my mind it makes sense to utilize a cache file
when running uclibc native but perhaps not while cross compiling ... so
perhaps add LIBRARY_CACHE:=-DUSE_CACHE to the section in Rules.mak where LDSO
is set to the uclibc linker (i.e. native) but set LIBRARY_CACHE:=#-DUSE_CACHE
where LDSO is the $(SYSTEM_LDSO) (i.e. cross compiling)
Applied with minor fixes.
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Remember to flose an fopened file
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on libuClibc
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on fully resolved names
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value correctly, since it forgot to lookup the correct value
in the string table.
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Also, build the iconv app in utils.
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Nothing overly interesting here, this renames Hitachi/Mitsubishi to Renesas
for the relevant platforms (in this case, h8, sh, and m32r). The same changes
have already been going on in gcc/binutils/gdb/glibc/etc.
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There is code in ldconfig that checks to see if a shared library is named
either ``lib*'' or ``ld-*'' before ldconfig -l will work on it. gawk uses this
feature of ldconfig to make /lib/rcscripts/filefuncs.so, so the build fails.
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Also try to make sure the build breaks if we want soft float but
don't know how to request it.
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broke the install target
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around...
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