And here is a link to the documentation for the _TIME_BITS Feature Test Macro https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html#index-_005fTIME_005fBITS
The docs for _FILE_OFFSET_BITS is just above. /Ola On Tue, Nov 08 2022, Ola x Nilsson wrote: > Sorry, that link did not explain the -D_USE_TIME_BITS=64 flag. > > I was sure I had read official docs of this somewhere but now I can only > find > https://sourceware.org/glibc/wiki/Y2038ProofnessDesign#Detailed_implementation > > /Ola > > On Tue, Nov 08 2022, Ola x Nilsson wrote: > >> As far as I can tell from glibc's documentation, this is how you are >> supposed to do it. glibc chose to always support both 32 and 64 bit >> APIs for time and file offset and make the normal int size the default. >> musl chose to switch to 64bit altogether. >> >> https://www.gnu.org/software/libc/manual/html_node/64_002dbit-time-symbol-handling.html >> >> /Ola >> >> On Tue, Nov 08 2022, Alexander Kanavin wrote: >> >>> I suppose what I want to say is - perhaps this should be discussed >>> with upstreams first? Things should 'just work' without having to set >>> some magic flags in an external configuration. >>> >>> Alex >>> >>> On Tue, 8 Nov 2022 at 13:18, Alexander Kanavin via >>> lists.openembedded.org <[email protected]> >>> wrote: >>>> >>>> Is this a recommendation somewhere official? >>>> >>>> Alex >>>> >>>> On Tue 8. Nov 2022 at 13.04, Niko Mauno <[email protected]> wrote: >>>>> >>>>> My understanding wrt. Y2038 and 32-bit glibc hosts was such that it >>>>> makes sense to set said compiler flags globally to ensure user space >>>>> wide Y2038 compliance. So I encountered this compiler error while >>>>> building poky reference images with additional effective >>>>> >>>>> TARGET_CPPFLAGS += "-D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64" >>>>> >>>>> declaration in meta/conf/distro/include/tclibc-glibc.inc. >>>>> >>>>> -Niko >>>>> >>>>> On 8.11.2022 13.50, Alexander Kanavin wrote: >>>>> > So you need to set -D_TIME_BITS=64 >>>>> > -D_FILE_OFFSET_BITS=64 to get some error? But why set that, shouldn’t >>>>> > the defaults work? >>>>> > >>>>> > Alex >>>>> > >>>>> > On Tue 8. Nov 2022 at 12.48, Niko Mauno <[email protected] >>>>> > <mailto:[email protected]>> wrote: >>>>> > >>>>> > I have not studied the issue, but in order to reproduce this error I >>>>> > add >>>>> > 'MACHINE = "qemuarm"' to local.conf then issue 'bitbake kbd' against >>>>> > current master while TARGET_CPPFLAGS value is set to >>>>> > "-D_TIME_BITS=64 >>>>> > -D_FILE_OFFSET_BITS=64". >>>>> > >>>>> > -Niko >>>>> > >>>>> > On 8.11.2022 11.14, Alexander Kanavin wrote: >>>>> > > We do build for 32 bit arm targets, so is this seen only in >>>>> > specific >>>>> > > circumstances? What are they? >>>>> > > >>>>> > > Alex >>>>> > > >>>>> > > On Tue, 8 Nov 2022 at 01:09, Niko Mauno via >>>>> > lists.openembedded.org >>>>> > <http://lists.openembedded.org/ >>>>> > > <[email protected] >>>>> > <mailto:[email protected]>> wrote: >>>>> > >> >>>>> > >> For now add exemption in order to avoid following failure during >>>>> > >> do_compile() >>>>> > >> >>>>> > >> | >>>>> > >>>>> > .../build/tmp/work/cortexa15t2hf-neon-poky-linux-gnueabi/kbd/2.5.1-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi/../../libexec/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/12.2.0/ld:.libs/libtswrap.ver:2: >>>>> > syntax error in VERSION script >>>>> > >> | collect2: error: ld returned 1 exit status >>>>> > >> >>>>> > >> Signed-off-by: Niko Mauno <[email protected] >>>>> > <mailto:[email protected]>> >>>>> > >> --- >>>>> > >> meta/recipes-core/kbd/kbd_2.5.1.bb >>>>> > <http://kbd_2.5.1.bb/ >>>>> > >> 1 file changed, 3 insertions(+) >>>>> > >> >>>>> > >> diff --git a/meta/recipes-core/kbd/kbd_2.5.1.bb >>>>> > <http://kbd_2.5.1.bb/ >>>>> > >> index aa3ab6e121..b623aecd36 100644 >>>>> > >> --- a/meta/recipes-core/kbd/kbd_2.5.1.bb >>>>> > <http://kbd_2.5.1.bb/ >>>>> > >> +++ b/meta/recipes-core/kbd/kbd_2.5.1.bb >>>>> > <http://kbd_2.5.1.bb/ >>>>> > >> @@ -18,6 +18,9 @@ SRC_URI = >>>>> > "${KERNELORG_MIRROR}/linux/utils/${BPN}/${BP}.tar.xz \ >>>>> > >> >>>>> > >> SRC_URI[sha256sum] = >>>>> > "ccdf452387a6380973d2927363e9cbb939fa2068915a6f937ff9d24522024683" >>>>> > >> >>>>> > >> +# Compiling 64 bit time for 32 bit host is broken >>>>> > >> +GLIBC_64BIT_TIME_CPPFLAGS = "" >>>>> > >> + >>>>> > >> PACKAGECONFIG ?= "${@bb.utils.filter('DISTRO_FEATURES', 'pam', >>>>> > d)} \ >>>>> > >> " >>>>> > >> >>>>> > >> -- >>>>> > >> 2.36.1 >>>>> > >> >>>>> > >> >>>>> > >> >>>>> > >> >>>>> > >>>> >>>> >>>> >>>> >>> [4. ATT00001.txt --- text/plain; ATT00001.txt]... > > [4. ATT00001.txt --- text/plain; ATT00001.txt]...
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#172988): https://lists.openembedded.org/g/openembedded-core/message/172988 Mute This Topic: https://lists.openembedded.org/mt/94880633/21656 Group Owner: [email protected] Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
