[PATCH 1/1] Fix incompatible function pointer types assigning to stream_find_id_func

[Brahmajit Das <brahmajit.xyz@gmail.com>]

Newer compilers such as Clang 16 and GCC 14 enables certain errors by
default, -Werror=incompatible-function-pointer-types being one of them
(-Werror=incompatible-pointer-types is the equivalent in GCC). This
resutls in build errors such as

error: incompatible function pointer types assigning to 'stream_find_id_func' (aka 'int (*)(struct kshark_data_stream *, const char *)') from 'const int (struct kshark_data_stream *, const char *)' [-Wincompatible-function-pointer-types]
 1204 |         interface->find_event_id = tepdata_find_event_id;
      |                                  ^ ~~~~~~~~~~~~~~~~~~~~~

My patch is not the best fix/a proper fix but for now silences the error
and lets me build kernelshark with clang.

I've also added some other misc. fixes that helps building kernelshark
on musl libc.

Bug: https://bugs.gentoo.org/895838
Signed-off-by: Brahmajit Das <brahmajit.xyz@gmail.com>
---
 src/kernelshark.cpp        | 1 +
 src/libkshark-tepdata.c    | 6 +++---
 src/libkshark.h            | 1 +
 src/plugins/sched_events.c | 1 +
 4 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/kernelshark.cpp b/src/kernelshark.cpp
index 1ad15f4..d795492 100644
--- a/src/kernelshark.cpp
+++ b/src/kernelshark.cpp
@@ -7,6 +7,7 @@
 // C
 #include <sys/stat.h>
 #include <getopt.h>
+#include <libgen.h>
 
 // Qt
 #include <QApplication>
diff --git a/src/libkshark-tepdata.c b/src/libkshark-tepdata.c
index b780957..236a858 100644
--- a/src/libkshark-tepdata.c
+++ b/src/libkshark-tepdata.c
@@ -1201,13 +1201,13 @@ static void kshark_tep_init_methods(struct kshark_generic_stream_interface *inte
 	interface->get_event_name = tepdata_get_event_name;
 	interface->aux_info= tepdata_get_latency;
 	interface->get_info = tepdata_get_info;
-	interface->find_event_id = tepdata_find_event_id;
+	interface->find_event_id = (stream_find_id_func) tepdata_find_event_id;
 	interface->get_all_event_ids = tepdata_get_event_ids;
 	interface->dump_entry = tepdata_dump_entry;
 	interface->get_all_event_field_names = tepdata_get_field_names;
 	interface->get_event_field_type = tepdata_get_field_type;
-	interface->read_record_field_int64 = tepdata_read_record_field;
-	interface->read_event_field_int64 = tepdata_read_event_field;
+	interface->read_record_field_int64 = (stream_read_record_field)tepdata_read_record_field;
+	interface->read_event_field_int64 = (stream_read_event_field) tepdata_read_event_field;
 	interface->load_entries = tepdata_load_entries;
 	interface->load_matrix = tepdata_load_matrix;
 }
diff --git a/src/libkshark.h b/src/libkshark.h
index 1514f33..c477c70 100644
--- a/src/libkshark.h
+++ b/src/libkshark.h
@@ -17,6 +17,7 @@
 #include <string.h>
 #include <pthread.h>
 #include <errno.h>
+#include <sys/types.h>
 
 // Json-C
 #include <json-c/json.h>
diff --git a/src/plugins/sched_events.c b/src/plugins/sched_events.c
index c3a4f47..fc5dc54 100644
--- a/src/plugins/sched_events.c
+++ b/src/plugins/sched_events.c
@@ -14,6 +14,7 @@
 #include <stdio.h>
 
 // trace-cmd
+#define _GNU_SOURCE             /* See feature_test_macros(7) */
 #include <trace-cmd.h>
 
 // KernelShark
-- 
2.42.0