8809 2015-12-15 08:39:59 +0000 gcc 5.2: armv5te: vsprintf appends unwanted ' ' spaces 2016-05-07 00:06:17 +0000 1 1 6 Yocto Project Subprojects Kernel linux-yocto 2.0 Other arm RESOLVED OBSOLETE Medium normal 2.2 1 afenkart afenkart --- --- No (bug/feature does not impact docs) oldest_to_newest 57264 0 2900 afenkart 2015-12-15 08:39:59 +0000 Created attachment 2900 workaround compiling kernel with yocto gcc 5.2 produces non functional kernel. compiled same source tree, standalone with gcc4.5[2] and through yocto with recipe[3] with gcc5.2[4]. output from gcc5.2 contains random spaces in output: PID hash table entries: 256 (order: -2, 1024 bytes) <- gcc 4.5 PID hash table entries: 256 (order: -2, 1024 bytes) <- gcc 5.2 Dentry cache hash table entries: 8192 (order: 3, 32768 bytes) <- gcc 4.5 Dentry cache hash table entries: 8192 (order: 3, 32768 bytes) <- gcc 5.2 It seems the spaces are introduced when a comparison between s16 and int incorrectly evaluates to true, see attached bug [1] https://git.digitalstrom.org/bsp/linux/tree/digitalStrom-imx6_4.1 [2] gcc version 4.9.3 20141031 (prerelease) (Linaro GCC 2014.11) [3] https://git.digitalstrom.org/dss-oe/dss-oe/blob/master/yocto/dS/meta-digitalstrom-devel/recipes-kernel/linux/linux-rescue_4.1.0.bb [4] arm-poky-linux-gnueabi-gcc (GCC) 5.2.0 # uname -a Linux dSS-kit 4.1.4+ #213 PREEMPT Tue Dec 15 09:23:56 CET 2015 armv5tejl GNU/Linux Machine: Atmel AT91SAM9G20EK Development Platform 57697 1 raj.khem 2016-01-09 10:43:17 +0000 can you try gcc 5.3 from master ? or backport https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67442 see if it helps 61988 2 sjolley.yp.pm 2016-05-05 15:24:06 +0000 Andreas can you answer Kim's question. 62030 3 afenkart 2016-05-07 00:06:17 +0000 Bug disappeared when upgrading to 4.1.19. I bisected it to this commit: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=a077224fd35b2f7fbc93f14cf67074fc792fbac2 It's a workaround, disables an optimization. This is the GCC bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65932 It says it's fixed for GCC 5.4 and GCC 6 2900 2015-12-15 08:39:59 +0000 2015-12-15 08:39:59 +0000 workaround 0001-vsprintf-yocto-compiler-gcc-5.2-regression-vsprintf-.patch text/plain 1665 afenkart RnJvbSAwZGYxODlhYzA0YmMzODY1Y2QxNjFkY2ZjNjRiODM4NzRjMWVkYjMwIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBBbmRyZWFzIEZlbmthcnQgPGFmZW5rYXJ0QGdtYWlsLmNvbT4K RGF0ZTogVHVlLCAxNSBEZWMgMjAxNSAwODozOTo0OCArMDEwMApTdWJqZWN0OiBbUEFUQ0hdIHZz cHJpbnRmOiB5b2N0byBjb21waWxlciBnY2MgNS4yIHJlZ3Jlc3Npb246IHZzcHJpbnRmIGFwcGVu ZHMKIHVud2FudGVkICcgJwoKZmllbGRfd2lkdGggaXMgLTI6Ci0gZm9ybWF0X2RlY29kZSBpbml0 aWFsaXplcyB0byAtMQotIGRlY3JlbWVudGVkIGlmIG5vdCBleHBsaWNpdGx5IGxlZnQgYWxpZ25l ZC4KZm9yIHNvbWUgcmVhc29uIGNvbXBhcmlzb24gKGxlbiA8IHNwZWMuZmllbGRfd2lkdGgpIGV2 YWx1YXRlcyB0byB0cnVlCnByaW50aygiJWQiLCBzcGVjLmZpZWxkX3dpdGgpLCByZXR1cm5zIDY1 NTM0CnMxNiAtPiB1MTYgLT4gaW50IHdvdWxkIHByb2R1Y2Ugc3VjaCByZXN1bHQKClNpZ25lZC1v ZmYtYnk6IEFuZHJlYXMgRmVua2FydCA8YWZlbmthcnRAZ21haWwuY29tPgotLS0KIGxpYi92c3By aW50Zi5jIHwgNiArKysrLS0KIDEgZmlsZSBjaGFuZ2VkLCA0IGluc2VydGlvbnMoKyksIDIgZGVs ZXRpb25zKC0pCgpkaWZmIC0tZ2l0IGEvbGliL3ZzcHJpbnRmLmMgYi9saWIvdnNwcmludGYuYwpp bmRleCBkYTM5YzYwLi5mZDMyNDI4IDEwMDY0NAotLS0gYS9saWIvdnNwcmludGYuYworKysgYi9s aWIvdnNwcmludGYuYwpAQCAtMzgzLDggKzM4Myw4IEBAIHN0cnVjdCBwcmludGZfc3BlYyB7CiAJ dTgJZmxhZ3M7CQkvKiBmbGFncyB0byBudW1iZXIoKSAqLwogCXU4CWJhc2U7CQkvKiBudW1iZXIg YmFzZSwgOCwgMTAgb3IgMTYgb25seSAqLwogCXU4CXF1YWxpZmllcjsJLyogbnVtYmVyIHF1YWxp Zmllciwgb25lIG9mICdoSGxMdHpaJyAqLwotCXMxNglmaWVsZF93aWR0aDsJLyogd2lkdGggb2Yg b3V0cHV0IGZpZWxkICovCi0JczE2CXByZWNpc2lvbjsJLyogIyBvZiBkaWdpdHMvY2hhcnMgKi8K KwlpbnQJZmllbGRfd2lkdGg7CS8qIHdpZHRoIG9mIG91dHB1dCBmaWVsZCAqLworCWludAlwcmVj aXNpb247CS8qICMgb2YgZGlnaXRzL2NoYXJzICovCiB9OwogCiBzdGF0aWMgbm9pbmxpbmVfZm9y X3N0YWNrCkBAIC01MTcsNiArNTE3LDcgQEAgY2hhciAqc3RyaW5nKGNoYXIgKmJ1ZiwgY2hhciAq ZW5kLCBjb25zdCBjaGFyICpzLCBzdHJ1Y3QgcHJpbnRmX3NwZWMgc3BlYykKIAlsZW4gPSBzdHJu bGVuKHMsIHNwZWMucHJlY2lzaW9uKTsKIAogCWlmICghKHNwZWMuZmxhZ3MgJiBMRUZUKSkgewor CQkvKiBmaWVsZF93aWR0aCBkZWNyZW1lbnRlZCBoZXJlICovCiAJCXdoaWxlIChsZW4gPCBzcGVj LmZpZWxkX3dpZHRoLS0pIHsKIAkJCWlmIChidWYgPCBlbmQpCiAJCQkJKmJ1ZiA9ICcgJzsKQEAg LTUyOSw2ICs1MzAsNyBAQCBjaGFyICpzdHJpbmcoY2hhciAqYnVmLCBjaGFyICplbmQsIGNvbnN0 IGNoYXIgKnMsIHN0cnVjdCBwcmludGZfc3BlYyBzcGVjKQogCQkrK2J1ZjsgKytzOwogCX0KIAl3 aGlsZSAobGVuIDwgc3BlYy5maWVsZF93aWR0aC0tKSB7CisJCS8qIHN0YXJ0cyBhZGRpbmcgc3Bh Y2VzIGlmIHMxNiAqLwogCQlpZiAoYnVmIDwgZW5kKQogCQkJKmJ1ZiA9ICcgJzsKIAkJKytidWY7 Ci0tIAoyLjYuMgoK