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* [Bug c/105305] New: ARM32: gcc does not pass all library directories to linker @ 2022-04-19 6:01 rui314 at gmail dot com 2022-04-19 6:11 ` [Bug target/105305] " pinskia at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: rui314 at gmail dot com @ 2022-04-19 6:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105305 Bug ID: 105305 Summary: ARM32: gcc does not pass all library directories to linker Product: gcc Version: 11.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: rui314 at gmail dot com Target Milestone: --- I'm the author of the mold linker (https://github.com/rui314/mold). As far as I know, gcc always passes all library paths to the linker by -L<dir>, but I got a bug report that that's not the case on ARM32. It is reported that gcc does not pass some obvious paths such as `-L/usr` or `-L/usr/lib`. The code to explicitly exclude "obvious" directories is here: https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/gcc.cc;h=bb07cc244e30fbeccc701816db888f497d65eb08;hb=refs/heads/master#l7931 mold and LLVM lld don't have the notion of the default search paths for the sake of build reproducibility. They guarantee that as long as you pass the exact same command line options and input files, the linkers behave exactly the same regardless of the host machine (in LLD, that's guaranteed even across Unix and Windows.) That helps us a lot when we do cross compilation. So, can gcc pass all library paths to the linker on ARM32? https://github.com/rui314/mold/issues/336 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/105305] ARM32: gcc does not pass all library directories to linker 2022-04-19 6:01 [Bug c/105305] New: ARM32: gcc does not pass all library directories to linker rui314 at gmail dot com @ 2022-04-19 6:11 ` pinskia at gcc dot gnu.org 2022-11-03 4:11 ` pinskia at gcc dot gnu.org 2022-11-03 4:25 ` rui314 at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-04-19 6:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105305 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |arm*-*-* --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Gold also didn't search any by default. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/105305] ARM32: gcc does not pass all library directories to linker 2022-04-19 6:01 [Bug c/105305] New: ARM32: gcc does not pass all library directories to linker rui314 at gmail dot com 2022-04-19 6:11 ` [Bug target/105305] " pinskia at gcc dot gnu.org @ 2022-11-03 4:11 ` pinskia at gcc dot gnu.org 2022-11-03 4:25 ` rui314 at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-11-03 4:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105305 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- >The code to explicitly exclude "obvious" directories is here That code has been there since before 1993. So I wonder if all other ld's always included /usr and /usr/lib by default. It is only the newer ones which don't. Does POSIX say anything about ld behavior? ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/105305] ARM32: gcc does not pass all library directories to linker 2022-04-19 6:01 [Bug c/105305] New: ARM32: gcc does not pass all library directories to linker rui314 at gmail dot com 2022-04-19 6:11 ` [Bug target/105305] " pinskia at gcc dot gnu.org 2022-11-03 4:11 ` pinskia at gcc dot gnu.org @ 2022-11-03 4:25 ` rui314 at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: rui314 at gmail dot com @ 2022-11-03 4:25 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105305 --- Comment #3 from Rui Ueyama <rui314 at gmail dot com> --- By other ld's, what linkers did you have in your mind? If lld, mold and gold don't hard code /usr and /usr/lib, then the only remaining linker is GNU ld. It doesn't seem like POSIX says about the default library search paths. I don't believe POSIX even mandates the existence of /usr and /usr/lib. macOS doesn't have such directories, but IIUC macOS at least one point in the past certified as POSIX compliant. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-11-03 4:25 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-04-19 6:01 [Bug c/105305] New: ARM32: gcc does not pass all library directories to linker rui314 at gmail dot com 2022-04-19 6:11 ` [Bug target/105305] " pinskia at gcc dot gnu.org 2022-11-03 4:11 ` pinskia at gcc dot gnu.org 2022-11-03 4:25 ` rui314 at gmail dot com
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