On Wed, Feb 01, 2023 at 09:36:37AM -0800, Josh Poimboeuf wrote: > On Wed, Feb 01, 2023 at 05:02:16PM +0000, Mark Rutland wrote: > > Hi, > > > > I just spotted this breaks cross-compiling; details below. > > Thanks, we'll fix it up with > > diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile > index 29a8cd7449bf..83b100c1e7f6 100644 > --- a/tools/objtool/Makefile > +++ b/tools/objtool/Makefile > @@ -36,7 +36,7 @@ OBJTOOL_CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBE > OBJTOOL_LDFLAGS := $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS) > > # Allow old libelf to be used: > -elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(CC) $(CFLAGS) -x c -E - | grep elf_getshdr) > +elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(HOSTCC) $(OBJTOOL_CFLAGS) -x c -E - | grep elf_getshdr) > OBJTOOL_CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED) > > # Always want host compilation. Profiting off of the occasion to point out that cross-compiling with CONFIG_DEBUG_INFO_BTF=y is also broken (it builds the resolve_btfids tool): I source this script when cross-compiling, which has worked up until now: #!/bin/bash export TOPDIR=$(cd "$(dirname "${BASH_SOURCE[0]}" )" && pwd) export PATH="${TOPDIR}/bin:$PATH" export ARCH="arm64" export CROSS_COMPILE="aarch64-none-linux-gnu-" export SYSROOT="${TOPDIR}/sysroot" export CC="aarch64-none-linux-gnu-gcc" export CXX="aarch64-none-linux-gnu-g++" export LDFLAGS="-L${SYSROOT}/usr/lib -L${SYSROOT}/usr/local/lib" export CFLAGS="-I${SYSROOT}/usr/include -I${SYSROOT}/usr/local/include" export CFLAGS="${CFLAGS} -Wno-format-nonliteral" export KBUILD_OUTPUT="output-arm64" Before reverting this patch, the build fails like this: $ make -j 8 Image.gz dtbs modules W=1 C=1 make[1]: Entering directory '/opt/net-next/output-arm64' SYNC include/config/auto.conf.cmd GEN Makefile GEN Makefile DESCEND bpf/resolve_btfids CC scripts/mod/empty.o CC scripts/mod/devicetable-offsets.s CHECK ../scripts/mod/empty.c INSTALL libsubcmd_headers MKELF scripts/mod/elfconfig.h HOSTCC scripts/mod/modpost.o HOSTCC scripts/mod/file2alias.o HOSTCC scripts/mod/sumversion.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/main.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/rbtree.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/string.o In file included from /opt/net-next/tools/include/linux/rbtree_augmented.h:19, from ../../lib/rbtree.c:12: /opt/net-next/tools/include/linux/rbtree.h: In function ‘rb_link_node’: /opt/net-next/tools/include/linux/rbtree.h:70:42: error: ‘NULL’ undeclared (first use in this function) 70 | node->rb_left = node->rb_right = NULL; | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:21:1: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? 20 | #include <linux/kernel.h> +++ |+#include <stddef.h> 21 | #include <linux/stddef.h> /opt/net-next/tools/include/linux/rbtree.h:70:42: note: each undeclared identifier is reported only once for each function it appears in 70 | node->rb_left = node->rb_right = NULL; | ^~~~ /opt/net-next/tools/include/linux/rbtree.h: At top level: /opt/net-next/tools/include/linux/rbtree.h:131:43: error: unknown type name ‘bool’ 131 | bool leftmost) | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:21:1: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? 20 | #include <linux/kernel.h> +++ |+#include <stdbool.h> 21 | #include <linux/stddef.h> /opt/net-next/tools/include/linux/rbtree.h:179:15: error: unknown type name ‘bool’ 179 | bool (*less)(struct rb_node *, const struct rb_node *)) | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:179:15: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? /opt/net-next/tools/include/linux/rbtree.h:207:8: error: unknown type name ‘bool’ 207 | bool (*less)(struct rb_node *, const struct rb_node *)) | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:207:8: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? /opt/net-next/tools/include/linux/rbtree.h: In function ‘rb_find_add’: /opt/net-next/tools/include/linux/rbtree.h:238:34: error: ‘NULL’ undeclared (first use in this function) 238 | struct rb_node *parent = NULL; | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:238:34: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? /opt/net-next/tools/include/linux/rbtree.h: In function ‘rb_find’: /opt/net-next/tools/include/linux/rbtree.h:283:16: error: ‘NULL’ undeclared (first use in this function) 283 | return NULL; | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:283:16: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? /opt/net-next/tools/include/linux/rbtree.h: In function ‘rb_find_first’: /opt/net-next/tools/include/linux/rbtree.h:299:33: error: ‘NULL’ undeclared (first use in this function) 299 | struct rb_node *match = NULL; | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:299:33: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? /opt/net-next/tools/include/linux/rbtree.h: In function ‘rb_next_match’: /opt/net-next/tools/include/linux/rbtree.h:330:24: error: ‘NULL’ undeclared (first use in this function) 330 | node = NULL; | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:330:24: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? In file included from ../../lib/rbtree.c:12: /opt/net-next/tools/include/linux/rbtree_augmented.h: At top level: /opt/net-next/tools/include/linux/rbtree_augmented.h:57:57: error: unknown type name ‘bool’ 57 | struct rb_root_cached *root, bool newleft, | ^~~~ /opt/net-next/tools/include/linux/rbtree_augmented.h:20:1: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? 19 | #include <linux/rbtree.h> +++ |+#include <stdbool.h> 20 | /opt/net-next/tools/include/linux/rbtree_augmented.h: In function ‘__rb_erase_augmented’: /opt/net-next/tools/include/linux/rbtree_augmented.h:208:37: error: ‘NULL’ undeclared (first use in this function) 208 | rebalance = NULL; | ^~~~ /opt/net-next/tools/include/linux/rbtree_augmented.h:20:1: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? 19 | #include <linux/rbtree.h> +++ |+#include <stddef.h> 20 | ../../lib/rbtree.c: In function ‘__rb_insert’: ../../lib/rbtree.c:90:16: error: ‘true’ undeclared (first use in this function) 90 | while (true) { | ^~~~ ../../lib/rbtree.c:14:1: note: ‘true’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? 13 | #include <linux/export.h> +++ |+#include <stdbool.h> 14 | ../../lib/rbtree.c:100:51: error: ‘NULL’ undeclared (first use in this function) 100 | rb_set_parent_color(node, NULL, RB_BLACK); | ^~~~ ../../lib/rbtree.c:14:1: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? 13 | #include <linux/export.h> +++ |+#include <stddef.h> 14 | ../../lib/rbtree.c: In function ‘____rb_erase_color’: ../../lib/rbtree.c:230:32: error: ‘NULL’ undeclared (first use in this function) 230 | struct rb_node *node = NULL, *sibling, *tmp1, *tmp2; | ^~~~ ../../lib/rbtree.c:230:32: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../../lib/rbtree.c:232:16: error: ‘true’ undeclared (first use in this function) 232 | while (true) { | ^~~~ ../../lib/rbtree.c:232:16: note: ‘true’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? ../../lib/rbtree.c: In function ‘rb_first’: ../../lib/rbtree.c:468:24: error: ‘NULL’ undeclared (first use in this function) 468 | return NULL; | ^~~~ ../../lib/rbtree.c:468:24: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../../lib/rbtree.c: In function ‘rb_last’: ../../lib/rbtree.c:480:24: error: ‘NULL’ undeclared (first use in this function) 480 | return NULL; | ^~~~ ../../lib/rbtree.c:480:24: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../../lib/rbtree.c: In function ‘rb_next’: ../../lib/rbtree.c:491:24: error: ‘NULL’ undeclared (first use in this function) 491 | return NULL; | ^~~~ ../../lib/rbtree.c:491:24: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../../lib/rbtree.c: In function ‘rb_prev’: ../../lib/rbtree.c:522:24: error: ‘NULL’ undeclared (first use in this function) 522 | return NULL; | ^~~~ ../../lib/rbtree.c:522:24: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../../lib/rbtree.c: In function ‘rb_next_postorder’: ../../lib/rbtree.c:577:24: error: ‘NULL’ undeclared (first use in this function) 577 | return NULL; | ^~~~ ../../lib/rbtree.c:577:24: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../../lib/rbtree.c: In function ‘rb_first_postorder’: ../../lib/rbtree.c:594:24: error: ‘NULL’ undeclared (first use in this function) 594 | return NULL; | ^~~~ ../../lib/rbtree.c:594:24: note: ‘NULL’ is defined in header ‘<stddef.h>’; did you forget to ‘#include <stddef.h>’? ../../lib/string.c:48:30: error: unknown type name ‘bool’ 48 | int strtobool(const char *s, bool *res) | ^~~~ ../../lib/string.c:21:1: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? 20 | #include <linux/ctype.h> +++ |+#include <stdbool.h> 21 | #include <linux/compiler.h> ../../lib/string.c:172:33: error: unknown type name ‘u8’ 172 | static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes) | ^~ ../../lib/string.c:172:44: error: unknown type name ‘u8’ 172 | static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes) | ^~ ../../lib/string.c: In function ‘memchr_inv’: ../../lib/string.c:194:9: error: unknown type name ‘u8’ 194 | u8 value = c; | ^~ ../../lib/string.c:195:9: error: unknown type name ‘u64’ 195 | u64 value64; | ^~~ ../../lib/string.c:199:24: warning: implicit declaration of function ‘check_bytes8’ [-Wimplicit-function-declaration] 199 | return check_bytes8(start, value, bytes); | ^~~~~~~~~~~~ ../../lib/string.c:199:24: warning: returning ‘int’ from a function with return type ‘void *’ makes pointer from integer without a cast [-Wint-conversion] 199 | return check_bytes8(start, value, bytes); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../../lib/string.c:204:28: warning: left shift count >= width of type [-Wshift-count-overflow] 204 | value64 |= value64 << 32; | ^~ ../../lib/string.c:208:17: error: unknown type name ‘u8’ 208 | u8 *r; | ^~ ../../lib/string.c:211:19: warning: assignment to ‘int *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion] 211 | r = check_bytes8(start, value, prefix); | ^ ../../lib/string.c:221:23: error: ‘u64’ undeclared (first use in this function) 221 | if (*(u64 *)start != value64) | ^~~ ../../lib/string.c:221:23: note: each undeclared identifier is reported only once for each function it appears in ../../lib/string.c:221:28: error: expected expression before ‘)’ token 221 | if (*(u64 *)start != value64) | ^ ../../lib/string.c:222:32: warning: returning ‘int’ from a function with return type ‘void *’ makes pointer from integer without a cast [-Wint-conversion] 222 | return check_bytes8(start, value, 8); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../../lib/string.c:227:16: warning: returning ‘int’ from a function with return type ‘void *’ makes pointer from integer without a cast [-Wint-conversion] 227 | return check_bytes8(start, value, bytes % 8); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ make[4]: *** [Build:9: /opt/net-next/output-arm64/tools/bpf/resolve_btfids/rbtree.o] Error 1 make[4]: *** Waiting for unfinished jobs.... make[4]: *** [Build:9: /opt/net-next/output-arm64/tools/bpf/resolve_btfids/string.o] Error 1 In file included from main.c:73: /opt/net-next/tools/include/linux/rbtree.h:131:43: error: unknown type name ‘bool’ 131 | bool leftmost) | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:21:1: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? 20 | #include <linux/kernel.h> +++ |+#include <stdbool.h> 21 | #include <linux/stddef.h> /opt/net-next/tools/include/linux/rbtree.h:179:15: error: unknown type name ‘bool’ 179 | bool (*less)(struct rb_node *, const struct rb_node *)) | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:179:15: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? /opt/net-next/tools/include/linux/rbtree.h:207:8: error: unknown type name ‘bool’ 207 | bool (*less)(struct rb_node *, const struct rb_node *)) | ^~~~ /opt/net-next/tools/include/linux/rbtree.h:207:8: note: ‘bool’ is defined in header ‘<stdbool.h>’; did you forget to ‘#include <stdbool.h>’? In file included from main.c:75: /opt/net-next/tools/include/linux/err.h:35:35: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ERR_PTR’ 35 | static inline void * __must_check ERR_PTR(long error_) | ^~~~~~~ /opt/net-next/tools/include/linux/err.h:40:33: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘PTR_ERR’ 40 | static inline long __must_check PTR_ERR(__force const void *ptr) | ^~~~~~~ /opt/net-next/tools/include/linux/err.h:45:15: error: unknown type name ‘bool’ 45 | static inline bool __must_check IS_ERR(__force const void *ptr) | ^~~~ /opt/net-next/tools/include/linux/err.h:45:33: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘IS_ERR’ 45 | static inline bool __must_check IS_ERR(__force const void *ptr) | ^~~~~~ /opt/net-next/tools/include/linux/err.h:50:15: error: unknown type name ‘bool’ 50 | static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr) | ^~~~ /opt/net-next/tools/include/linux/err.h:50:33: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘IS_ERR_OR_NULL’ 50 | static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr) | ^~~~~~~~~~~~~~ /opt/net-next/tools/include/linux/err.h:55:32: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘PTR_ERR_OR_ZERO’ 55 | static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr) | ^~~~~~~~~~~~~~~ /opt/net-next/tools/include/linux/err.h:70:35: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ERR_CAST’ 70 | static inline void * __must_check ERR_CAST(__force const void *ptr) | ^~~~~~~~ In file included from main.c:76: /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/btf.h:208:35: warning: ‘enum btf_func_linkage’ declared inside parameter list will not be visible outside of this definition or declaration 208 | enum btf_func_linkage linkage, int proto_type_id); | ^~~~~~~~~~~~~~~~ /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/btf.h: In function ‘btf_kflag’: /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/btf.h:332:16: warning: implicit declaration of function ‘BTF_INFO_KFLAG’; did you mean ‘BTF_INFO_KIND’? [-Wimplicit-function -declaration] 332 | return BTF_INFO_KFLAG(t->info); | ^~~~~~~~~~~~~~ | BTF_INFO_KIND /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/btf.h: In function ‘btf_member_bit_offset’: /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/btf.h:534:24: warning: implicit declaration of function ‘BTF_MEMBER_BIT_OFFSET’ [-Wimplicit-function-declaration] 534 | return kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset; | ^~~~~~~~~~~~~~~~~~~~~ /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/btf.h: In function ‘btf_member_bitfield_size’: /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/btf.h:546:24: warning: implicit declaration of function ‘BTF_MEMBER_BITFIELD_SIZE’ [-Wimplicit-function-declaration] 546 | return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0; | ^~~~~~~~~~~~~~~~~~~~~~~~ In file included from main.c:77: /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/libbpf.h: At top level: /opt/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/sysroot/usr/include/bpf/libbpf.h:70:54: warning: ‘enum bpf_link_type’ declared inside parameter list will not be visible outside of this definition or declaration 70 | LIBBPF_API const char *libbpf_bpf_link_type_str(enum bpf_link_type t); | ^~~~~~~~~~~~~ In file included from main.c:73: main.c: In function ‘btf_id__find’: /opt/net-next/tools/include/linux/rbtree.h:37:37: warning: implicit declaration of function ‘container_of’ [-Wimplicit-function-declaration] 37 | #define rb_entry(ptr, type, member) container_of(ptr, type, member) | ^~~~~~~~~~~~ main.c:174:22: note: in expansion of macro ‘rb_entry’ 174 | id = rb_entry(p, struct btf_id, rb_node); | ^~~~~~~~ main.c:174:34: error: expected expression before ‘struct’ 174 | id = rb_entry(p, struct btf_id, rb_node); | ^~~~~~ /opt/net-next/tools/include/linux/rbtree.h:37:55: note: in definition of macro ‘rb_entry’ 37 | #define rb_entry(ptr, type, member) container_of(ptr, type, member) | ^~~~ main.c: In function ‘btf_id__add’: main.c:196:39: error: expected expression before ‘struct’ 196 | id = rb_entry(parent, struct btf_id, rb_node); | ^~~~~~ /opt/net-next/tools/include/linux/rbtree.h:37:55: note: in definition of macro ‘rb_entry’ 37 | #define rb_entry(ptr, type, member) container_of(ptr, type, member) | ^~~~ main.c: In function ‘__symbols_patch’: main.c:632:37: error: expected expression before ‘struct’ 632 | id = rb_entry(next, struct btf_id, rb_node); | ^~~~~~ /opt/net-next/tools/include/linux/rbtree.h:37:55: note: in definition of macro ‘rb_entry’ 37 | #define rb_entry(ptr, type, member) container_of(ptr, type, member) | ^~~~ main.c: In function ‘sets_patch’: main.c:662:39: error: expected expression before ‘struct’ 662 | id = rb_entry(next, struct btf_id, rb_node); | ^~~~~~ /opt/net-next/tools/include/linux/rbtree.h:37:55: note: in definition of macro ‘rb_entry’ 37 | #define rb_entry(ptr, type, member) container_of(ptr, type, member) | ^~~~ In file included from main.c:78: main.c: In function ‘main’: /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/include/subcmd/parse-options.h:118:32: warning: implicit declaration of function ‘BUILD_BUG_ON_ZERO’ [-Wimplicit-function-declaration] 118 | #define check_vtype(v, type) ( BUILD_BUG_ON_ZERO(!__builtin_types_compatible_p(typeof(v), type)) + v ) | ^~~~~~~~~~~~~~~~~ /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/include/subcmd/parse-options.h:131:106: note: in expansion of macro ‘check_vtype’ 131 | #define OPT_INCR(s, l, v, h) { .type = OPTION_INCR, .short_name = (s), .long_name = (l), .value = check_vtype(v, int *), .help = (h) } | ^~~~~~~~~~~ main.c:736:17: note: in expansion of macro ‘OPT_INCR’ 736 | OPT_INCR('v', "verbose", &verbose, | ^~~~~~~~ make[4]: *** [/opt/net-next/tools/build/Makefile.build:97: /opt/net-next/output-arm64/tools/bpf/resolve_btfids/main.o] Error 1 make[3]: *** [Makefile:80: /opt/net-next/output-arm64/tools/bpf/resolve_btfids//resolve_btfids-in.o] Error 2 make[2]: *** [Makefile:76: bpf/resolve_btfids] Error 2 make[1]: *** [/opt/net-next/Makefile:1451: tools/bpf/resolve_btfids] Error 2 make[1]: *** Waiting for unfinished jobs.... HOSTLD scripts/mod/modpost CC kernel/bounds.s CC arch/arm64/kernel/asm-offsets.s CALL ../scripts/checksyscalls.sh make[1]: Leaving directory '/opt/net-next/output-arm64' make: *** [Makefile:242: __sub-make] Error 2 After reverting: make -j 8 Image.gz dtbs modules W=1 C=1 make[1]: Entering directory '/opt/net-next/output-arm64' GEN Makefile DESCEND bpf/resolve_btfids CALL ../scripts/checksyscalls.sh INSTALL libsubcmd_headers CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/exec-cmd.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/help.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/pager.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/parse-options.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/run-command.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/sigchain.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/subcmd-config.o LDS arch/arm64/kernel/vdso/vdso.lds CC arch/arm64/kernel/vdso/vgettimeofday.o AS arch/arm64/kernel/vdso/note.o AS arch/arm64/kernel/vdso/sigreturn.o CHECK ../arch/arm64/kernel/vdso/vgettimeofday.c ../arch/arm64/kernel/vdso/vgettimeofday.c:9:5: warning: symbol '__kernel_clock_gettime' was not declared. Should it be static? ../arch/arm64/kernel/vdso/vgettimeofday.c:15:5: warning: symbol '__kernel_gettimeofday' was not declared. Should it be static? ../arch/arm64/kernel/vdso/vgettimeofday.c:21:5: warning: symbol '__kernel_clock_getres' was not declared. Should it be static? LD arch/arm64/kernel/vdso/vdso.so.dbg VDSOSYM include/generated/vdso-offsets.h OBJCOPY arch/arm64/kernel/vdso/vdso.so LD /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/libsubcmd-in.o AR /opt/net-next/output-arm64/tools/bpf/resolve_btfids/libsubcmd/libsubcmd.a CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/main.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/rbtree.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/zalloc.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/string.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/ctype.o CC /opt/net-next/output-arm64/tools/bpf/resolve_btfids/str_error_r.o LD /opt/net-next/output-arm64/tools/bpf/resolve_btfids/resolve_btfids-in.o LINK resolve_btfids (...) Sadly idk how to fix it. I put this print in tools/bpf/resolve_btfids/Makefile if it helps: $(error CC $(CC) HOSTCC $(HOSTCC) HOSTCFLAGS $(HOSTCFLAGS) KBUILD_HOSTCFLAGS $(KBUILD_HOSTLDFLAGS)) which outputs: Makefile:24: *** CC aarch64-none-linux-gnu-gcc HOSTCC gcc HOSTCFLAGS KBUILD_HOSTCFLAGS . Stop.
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