On 5/12/26 23:33, Khem Raj wrote: > > > On Fri, May 8, 2026 at 8:08 PM He Zhe via lists.openembedded.org > <https://urldefense.com/v3/__http://lists.openembedded.org__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesPAVTLMn$> > <[email protected]> wrote: > > Backport a patch from kernel to fix the following build errors. > > bbpf.c: In function ‘kallsyms_cb’: > | libbpf.c:8192:13: error: assignment discards ‘const’ qualifier from > pointer target type [-Werror=discarded-qualifiers] > | 8192 | res = strstr(sym_name, ".llvm."); > | | ^ > | libbpf.c: In function ‘avail_kallsyms_cb’: > | libbpf.c:11497:31: error: assignment discards ‘const’ qualifier from > pointer target type [-Werror=discarded-qualifiers] > | 11497 | if (!(sym_sfx = strstr(sym_name, ".llvm."))) > | | ^ > | libbpf.c: In function ‘resolve_full_path’: > | libbpf.c:12085:35: error: assignment discards ‘const’ qualifier from > pointer target type [-Werror=discarded-qualifiers] > | 12085 | next_path = strchr(s, ':'); > | | > > Signed-off-by: He Zhe <[email protected]> > --- > .../bpftool/bpftool-native_6.16.bb > <https://urldefense.com/v3/__http://bpftool-native_6.16.bb__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesB2Q-Gdp$> > | 5 +- > ...-Fix-Wdiscarded-qualifiers-under-C23.patch | 69 +++++++++++++++++++ > 2 files changed, 73 insertions(+), 1 deletion(-) > create mode 100644 > meta-oe/recipes-kernel/bpftool/bpftool/0001-libbpf-Fix-Wdiscarded-qualifiers-under-C23.patch > > diff --git a/meta-oe/recipes-kernel/bpftool/bpftool-native_6.16.bb > <https://urldefense.com/v3/__http://bpftool-native_6.16.bb__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesB2Q-Gdp$> > b/meta-oe/recipes-kernel/bpftool/bpftool-native_6.16.bb > <https://urldefense.com/v3/__http://bpftool-native_6.16.bb__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesB2Q-Gdp$> > index fe3ad6138e..edc635517a 100644 > --- a/meta-oe/recipes-kernel/bpftool/bpftool-native_6.16.bb > <https://urldefense.com/v3/__http://bpftool-native_6.16.bb__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesB2Q-Gdp$> > +++ b/meta-oe/recipes-kernel/bpftool/bpftool-native_6.16.bb > <https://urldefense.com/v3/__http://bpftool-native_6.16.bb__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesB2Q-Gdp$> > @@ -9,7 +9,10 @@ DEPENDS = "binutils-native elfutils-native" > > inherit native bash-completion > > -SRC_URI = "${KERNELORG_MIRROR}/linux/kernel/v6.x/linux-${PV}.tar.xz" > +SRC_URI = "\ > + ${KERNELORG_MIRROR}/linux/kernel/v6.x/linux-${PV}.tar.xz \ > + file://0001-libbpf-Fix-Wdiscarded-qualifiers-under-C23.patch \ > +" > SRC_URI[sha256sum] = > "1a4be2fe6b5246aa4ac8987a8a4af34c42a8dd7d08b46ab48516bcc1befbcd83" > > S = "${UNPACKDIR}/linux-${PV}" > diff --git > a/meta-oe/recipes-kernel/bpftool/bpftool/0001-libbpf-Fix-Wdiscarded-qualifiers-under-C23.patch > > b/meta-oe/recipes-kernel/bpftool/bpftool/0001-libbpf-Fix-Wdiscarded-qualifiers-under-C23.patch > new file mode 100644 > index 0000000000..76b9aabb54 > --- /dev/null > +++ > b/meta-oe/recipes-kernel/bpftool/bpftool/0001-libbpf-Fix-Wdiscarded-qualifiers-under-C23.patch > @@ -0,0 +1,69 @@ > +From ab21cf885fb2af179c44d8beeabd716133b9385d Mon Sep 17 00:00:00 2001 > +From: Mikhail Gavrilov <[email protected]> > +Date: Sat, 6 Dec 2025 14:28:25 +0500 > +Subject: [PATCH] libbpf: Fix -Wdiscarded-qualifiers under C23 > +MIME-Version: 1.0 > +Content-Type: text/plain; charset=UTF-8 > +Content-Transfer-Encoding: 8bit > + > +commit d70f79fef65810faf64dbae1f3a1b5623cdb2345 upstream. > + > +glibc ≥ 2.42 (GCC 15) defaults to -std=gnu23, which promotes > +-Wdiscarded-qualifiers to an error. > + > +In C23, strstr() and strchr() return "const char *". > + > +Change variable types to const char * where the pointers are never > +modified (res, sym_sfx, next_path). > + > +Suggested-by: Florian Weimer <[email protected]> > +Suggested-by: Andrii Nakryiko <[email protected]> > +Signed-off-by: Mikhail Gavrilov <[email protected]> > +Link: > https://lore.kernel.org/r/[email protected] > > <https://urldefense.com/v3/__https://lore.kernel.org/r/[email protected]__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesJitfz3F$> > +Signed-off-by: Alexei Starovoitov <[email protected]> > +[ shung-hsi.yu: needed to fix kernel build failure due to libbpf since > glibc > + 2.43+ (which adds 'const' qualifier to strstr) ] > +Signed-off-by: Shung-Hsi Yu <[email protected]> > +Signed-off-by: Greg Kroah-Hartman <[email protected]> > + > +Upstream-Status: > Backport[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.18.y&id=ab21cf885fb2af179c44d8beeabd716133b9385d > > <https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.18.y&id=ab21cf885fb2af179c44d8beeabd716133b9385d__;!!AjveYdw8EvQ!fyU-8plaF3gPF7YmHPCen6iKCIBIZoQ_R9_L9KoFZOc_83Rybpe8c1G0dpdd_F-YLMUE8KAesMcSqBdC$>] > > > This seems to be malformed ( add a space after 'Backport' )
v2 sent. Thanks. Zhe > > > +Signed-off-by: He Zhe <[email protected]> > +--- > + tools/lib/bpf/libbpf.c | 7 ++++--- > + 1 file changed, 4 insertions(+), 3 deletions(-) > + > +diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c > +index dd3b2f57082d..9c98c6adb6d0 100644 > +--- a/tools/lib/bpf/libbpf.c > ++++ b/tools/lib/bpf/libbpf.c > +@@ -8245,7 +8245,7 @@ static int kallsyms_cb(unsigned long long > sym_addr, char sym_type, > + struct bpf_object *obj = ctx; > + const struct btf_type *t; > + struct extern_desc *ext; > +- char *res; > ++ const char *res; > + > + res = strstr(sym_name, ".llvm."); > + if (sym_type == 'd' && res) > +@@ -11574,7 +11574,8 @@ static int avail_kallsyms_cb(unsigned long long > sym_addr, char sym_type, > + * > + * [0] fb6a421fb615 ("kallsyms: Match symbols exactly > with CONFIG_LTO_CLANG") > + */ > +- char sym_trim[256], *psym_trim = sym_trim, *sym_sfx; > ++ char sym_trim[256], *psym_trim = sym_trim; > ++ const char *sym_sfx; > + > + if (!(sym_sfx = strstr(sym_name, ".llvm."))) > + return 0; > +@@ -12159,7 +12160,7 @@ static int resolve_full_path(const char *file, > char *result, size_t result_sz) > + if (!search_paths[i]) > + continue; > + for (s = search_paths[i]; s != NULL; s = strchr(s, ':')) { > +- char *next_path; > ++ const char *next_path; > + int seg_len; > + > + if (s[0] == ':') > +-- > +2.34.1 > + > -- > 2.34.1 > > > >
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