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[Bug ld/29288] Dependent libraries cannot be found with default sysroot

From: galaxyking0419 at gmail dot com
Subject: [Bug ld/29288] Dependent libraries cannot be found with default sysroot search dir and rpath using cross ld
Date: Thu, 30 Jun 2022 12:37:51 +0000


--- Comment #8 from William Tang <galaxyking0419 at gmail dot com> ---
(In reply to Alan Modra from comment #7)
> sysroot and rpath are complicated, and can be difficult to get right.  If
> using sysroot you have a linker that has access to your entire file system,
> but default searches should be as if the linker was chroot'd at the sysroot.
> BFD ld adds the sysroot to absolute paths in rpath when searching for shared
> library dependencies, ie. libraries not mentioned on the command line but
> found in DT_NEEDED entries of other libraries.  If you accept that linking
> against libraries not mentioned on the command line is a good thing
> (debatable), then emulating the run-time loader is necessary.  Note that
> gold doesn't go searching for library dependencies, hence the gold
> difference.
> I don't believe BFD ld prefixes -rpath paths with the sysroot in other
> circumstances.  (You definitely would not want the sysroot prefix added to
> DT_NEEDED in executables you create, since they then would have the wrong
> paths if copied over to a native environment.)
> BFD ld also replaces an initial "=" or "$SYSROOT" in any -L or other
> paths with the sysroot.  If configured with a sysroot, the default
> library search paths have the "=" prefix.  eg. "=/usr/lib" and "=/lib".

Thanks for the detailed explanation.  But I still cannot understand why bfd ld
always add "SEARCH_DIR("=/usr/arm-linux-gnueabihf/lib");" (which expanded to
"/usr/arm-linux-gnueabihf/usr/arm-linux-gnueabihf/lib") to the search dir
instead of something more reasonable like "SEARCH_DIR("=/lib");" (which
expanded to "/usr/arm-linux-gnueabihf/lib").  The former path is pointing to an
empty directory.

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