Re: Build failure bft for trace-cmd and libtraceevent

On 08/02/2026 22:32, Steven Rostedt wrote:
> On Sun, 8 Feb 2026 21:53:31 +0100
> Giulio Benetti <[email protected]> wrote:
> 
>> Otherwise the solution could be to switch according to Linux version
>> between print_args() with and without bft support, basically re-adding
>> the function here:
>> https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/commit/?id=e798103c0815e6642e74d9317c325b2c62681f2e
>>
>> What do you think about it?
> 
> Is the failure found at runtime? That is, the loaded BTF file doesn't
> parse correctly? What is the error exactly?
> 
> I guess if the tep_btf_print_args() fails, it should just print the raw
> args then.

Oh, I've forgotten to post the build failure, here it is and it's due to
dealing with different Linux versions:
[8/40] Compiling C object src/libtraceevent.so.1.9.0.p/trace-btf.c.o
FAILED: [code=1] src/libtraceevent.so.1.9.0.p/trace-btf.c.o
/home/giuliobenetti/git/upstream/test-libtraceevent/bootlin-armv5-uclibc/host/bin/arm-linux-gcc 
-Isrc/libtraceevent.so.1.9.0.p -Isrc -I../src -Iinclude -I../include 
-Iinclude/traceevent -I../include/traceevent -fdiagnostics-color=always 
-Wall -Winvalid-pch -std=gnu99 -O3 -D_GNU_SOURCE 
'-DPLUGIN_DIR="/usr/lib/traceevent/plugins"' -D_LARGEFILE_SOURCE 
-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g0 -fPIC -MD -MQ 
src/libtraceevent.so.1.9.0.p/trace-btf.c.o -MF 
src/libtraceevent.so.1.9.0.p/trace-btf.c.o.d -o 
src/libtraceevent.so.1.9.0.p/trace-btf.c.o -c ../src/trace-btf.c
../src/trace-btf.c:60:10: error: ‘BTF_KIND_FLOAT’ undeclared here (not 
in a function); did you mean ‘BTF_KIND_CONST’?
    60 |         [BTF_KIND_FLOAT]        = "FLOAT",
       |          ^~~~~~~~~~~~~~
       |          BTF_KIND_CONST
../src/trace-btf.c:60:10: error: array index in initializer not of 
integer type
../src/trace-btf.c:60:10: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c:60:35: warning: excess elements in array initializer
    60 |         [BTF_KIND_FLOAT]        = "FLOAT",
       |                                   ^~~~~~~
../src/trace-btf.c:60:35: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c:61:10: error: ‘BTF_KIND_DECL_TAG’ undeclared here 
(not in a function)
    61 |         [BTF_KIND_DECL_TAG]     = "DECL_TAG",
       |          ^~~~~~~~~~~~~~~~~
../src/trace-btf.c:61:10: error: array index in initializer not of 
integer type
../src/trace-btf.c:61:10: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c:61:35: warning: excess elements in array initializer
    61 |         [BTF_KIND_DECL_TAG]     = "DECL_TAG",
       |                                   ^~~~~~~~~~
../src/trace-btf.c:61:35: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c:62:10: error: ‘BTF_KIND_TYPE_TAG’ undeclared here 
(not in a function); did you mean ‘BTF_KIND_TYPEDEF’?
    62 |         [BTF_KIND_TYPE_TAG]     = "TYPE_TAG",
       |          ^~~~~~~~~~~~~~~~~
       |          BTF_KIND_TYPEDEF
../src/trace-btf.c:62:10: error: array index in initializer not of 
integer type
../src/trace-btf.c:62:10: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c:62:35: warning: excess elements in array initializer
    62 |         [BTF_KIND_TYPE_TAG]     = "TYPE_TAG",
       |                                   ^~~~~~~~~~
../src/trace-btf.c:62:35: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c:63:10: error: ‘BTF_KIND_ENUM64’ undeclared here (not 
in a function); did you mean ‘BTF_KIND_ENUM’?
    63 |         [BTF_KIND_ENUM64]       = "ENUM64",
       |          ^~~~~~~~~~~~~~~
       |          BTF_KIND_ENUM
../src/trace-btf.c:63:10: error: array index in initializer not of 
integer type
../src/trace-btf.c:63:10: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c:63:35: warning: excess elements in array initializer
    63 |         [BTF_KIND_ENUM64]       = "ENUM64",
       |                                   ^~~~~~~~
../src/trace-btf.c:63:35: note: (near initialization for ‘btf_kind_str’)
../src/trace-btf.c: In function ‘btf_type_size’:
../src/trace-btf.c:115:38: error: invalid application of ‘sizeof’ to 
incomplete type ‘struct btf_decl_tag’
   115 |                 return size + sizeof(struct btf_decl_tag);
       |                                      ^~~~~~
../src/trace-btf.c:119:38: error: invalid application of ‘sizeof’ to 
incomplete type ‘struct btf_enum64’
   119 |                 return size + sizeof(struct btf_enum64) * 
BTF_INFO_VLEN(type->info);
       |                                      ^~~~~~
[9/40] Compiling C object plugins/plugin_kmem.so.p/plugin_kmem.c.o
[10/40] Compiling C object plugins/plugin_tlb.so.p/plugin_tlb.c.o
[11/40] Compiling C object plugins/plugin_net.so.p/plugin_net.c.o
[12/40] Compiling C object src/libtraceevent.so.1.9.0.p/parse-utils.c.o
[13/40] Compiling C object 
plugins/plugin_sched_switch.so.p/plugin_sched_switch.c.o
[14/40] Compiling C object samples/test-event.p/test-event.c.o
[15/40] Compiling C object plugins/plugin_scsi.so.p/plugin_scsi.c.o
[16/40] Compiling C object src/libtraceevent.so.1.9.0.p/event-parse-api.c.o
[17/40] Compiling C object plugins/plugin_function.so.p/plugin_function.c.o
[18/40] Compiling C object src/libtraceevent.so.1.9.0.p/trace-seq.c.o
[19/40] Compiling C object plugins/plugin_kvm.so.p/plugin_kvm.c.o
[20/40] Compiling C object src/libtraceevent.so.1.9.0.p/event-plugin.c.o
[21/40] Compiling C object src/libtraceevent.so.1.9.0.p/kbuffer-parse.c.o
[22/40] Compiling C object src/libtraceevent.so.1.9.0.p/parse-filter.c.o
[23/40] Compiling C object src/libtraceevent.so.1.9.0.p/event-parse.c.o
ninja: build stopped: subcommand failed.
make[1]: *** [package/pkg-generic.mk:273: 
/home/giuliobenetti/git/upstream/test-libtraceevent/bootlin-armv5-uclibc/build/libtraceevent-1.9.0/.stamp_built] 
Error 1
make: *** [Makefile:83: _all] Error 2

Giulio