From b4051ad8c170901d5297e1b3005b24e63cb0ab1e Mon Sep 17 00:00:00 2001
From: Francis Deslauriers <francis.deslauriers@efficios.com>
Date: Tue, 3 Dec 2019 15:33:22 -0500
Subject: [PATCH] Cleanup: apply `include-what-you-use` guideline for `size_t`

I saw that some files use the `size_t` type but there are not including
a header for it. The `size_t` type is defined by the following headers:
  <stddef.h>
  <stdio.h>
  <stdlib.h>
  <string.h>
  <time.h>
  <wchar.h>

So, to follow the best practice of including what is used in a file, I
added `#include <stddef.h>` in files using `size_t` but did not include
any of the previously listed header.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ica1d82691335294decf13ffcdf4257e35d6a44c2
---
 doc/examples/demo/ust_tests_demo2.h              | 1 +
 doc/examples/hello-static-lib/ust_tests_hello.h  | 1 +
 include/lttng/ust-context-provider.h             | 1 +
 include/lttng/ust-ctl.h                          | 1 +
 include/lttng/ust-events.h                       | 1 +
 include/ust_snprintf.h                           | 1 +
 liblttng-ust-dl/ust_dl.h                         | 1 +
 liblttng-ust/getenv.c                            | 1 +
 liblttng-ust/jhash.h                             | 1 +
 liblttng-ust/lttng-context-cgroup-ns.c           | 1 +
 liblttng-ust/lttng-context-cpu-id.c              | 1 +
 liblttng-ust/lttng-context-ip.c                  | 1 +
 liblttng-ust/lttng-context-ipc-ns.c              | 1 +
 liblttng-ust/lttng-context-mnt-ns.c              | 1 +
 liblttng-ust/lttng-context-net-ns.c              | 1 +
 liblttng-ust/lttng-context-perf-counters.c       | 1 +
 liblttng-ust/lttng-context-pid-ns.c              | 1 +
 liblttng-ust/lttng-context-procname.c            | 1 +
 liblttng-ust/lttng-context-provider.c            | 1 +
 liblttng-ust/lttng-context-pthread-id.c          | 1 +
 liblttng-ust/lttng-context-user-ns.c             | 1 +
 liblttng-ust/lttng-context-uts-ns.c              | 1 +
 liblttng-ust/lttng-context-vegid.c               | 1 +
 liblttng-ust/lttng-context-veuid.c               | 1 +
 liblttng-ust/lttng-context-vgid.c                | 1 +
 liblttng-ust/lttng-context-vpid.c                | 1 +
 liblttng-ust/lttng-context-vsgid.c               | 1 +
 liblttng-ust/lttng-context-vsuid.c               | 1 +
 liblttng-ust/lttng-context-vtid.c                | 1 +
 liblttng-ust/lttng-context-vuid.c                | 1 +
 liblttng-ust/lttng-context.c                     | 1 +
 liblttng-ust/lttng-filter-interpreter.c          | 3 ++-
 liblttng-ust/lttng-filter-specialize.c           | 2 ++
 liblttng-ust/lttng-filter-validator.c            | 1 +
 liblttng-ust/lttng-filter.c                      | 1 +
 liblttng-ust/lttng-hash-helper.h                 | 1 +
 liblttng-ust/lttng-ring-buffer-client.h          | 1 +
 liblttng-ust/lttng-ring-buffer-metadata-client.h | 1 +
 liblttng-ust/lttng-ust-comm.c                    | 1 +
 liblttng-ust/lttng-ust-statedump-provider.h      | 1 +
 liblttng-ust/string-utils.h                      | 1 +
 liblttng-ust/ust-core.c                          | 1 +
 liblttng-ust/ust_lib.h                           | 1 +
 libringbuffer/backend.h                          | 1 +
 libringbuffer/backend_internal.h                 | 1 +
 libringbuffer/frontend.h                         | 1 +
 libringbuffer/frontend_api.h                     | 5 ++++-
 libringbuffer/ring_buffer_backend.c              | 1 +
 libringbuffer/shm.h                              | 1 +
 libringbuffer/shm_types.h                        | 1 +
 snprintf/fvwrite.h                               | 2 ++
 snprintf/patient_write.c                         | 2 ++
 snprintf/snprintf.c                              | 1 +
 snprintf/various.h                               | 1 +
 snprintf/wcio.h                                  | 2 ++
 tests/hello.cxx/ust_tests_hello.h                | 1 +
 tests/hello/ust_tests_hello.h                    | 1 +
 tests/test-app-ctx/hello.c                       | 1 +
 tests/test-app-ctx/ust_tests_hello.h             | 1 +
 59 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/doc/examples/demo/ust_tests_demo2.h b/doc/examples/demo/ust_tests_demo2.h
index eec0349e..4470dc06 100644
--- a/doc/examples/demo/ust_tests_demo2.h
+++ b/doc/examples/demo/ust_tests_demo2.h
@@ -27,6 +27,7 @@
  */
 
 #include <lttng/tracepoint.h>
+#include <stddef.h>
 
 TRACEPOINT_EVENT(ust_tests_demo2, loop,
 	TP_ARGS(int, anint, int, netint, long *, values,
diff --git a/doc/examples/hello-static-lib/ust_tests_hello.h b/doc/examples/hello-static-lib/ust_tests_hello.h
index e783feca..2b557563 100644
--- a/doc/examples/hello-static-lib/ust_tests_hello.h
+++ b/doc/examples/hello-static-lib/ust_tests_hello.h
@@ -27,6 +27,7 @@
  */
 
 #include <lttng/tracepoint.h>
+#include <stddef.h>
 
 TRACEPOINT_EVENT(ust_tests_hello, tptest,
 	TP_ARGS(int, anint, int, netint, long *, values,
diff --git a/include/lttng/ust-context-provider.h b/include/lttng/ust-context-provider.h
index 5b266fa8..4573617b 100644
--- a/include/lttng/ust-context-provider.h
+++ b/include/lttng/ust-context-provider.h
@@ -23,6 +23,7 @@
  * SOFTWARE.
  */
 
+#include <stddef.h>
 #include <lttng/ust-events.h>
 #include <urcu/hlist.h>
 
diff --git a/include/lttng/ust-ctl.h b/include/lttng/ust-ctl.h
index 932940ba..56128490 100644
--- a/include/lttng/ust-ctl.h
+++ b/include/lttng/ust-ctl.h
@@ -19,6 +19,7 @@
 #ifndef _LTTNG_UST_CTL_H
 #define _LTTNG_UST_CTL_H
 
+#include <stddef.h>
 #include <lttng/ust-abi.h>
 #include <sys/types.h>
 #include <limits.h>
diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h
index 89309682..a9f80fb0 100644
--- a/include/lttng/ust-events.h
+++ b/include/lttng/ust-events.h
@@ -29,6 +29,7 @@
 
 #include <urcu/list.h>
 #include <urcu/hlist.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <lttng/ust-config.h>
 #include <lttng/ust-abi.h>
diff --git a/include/ust_snprintf.h b/include/ust_snprintf.h
index 5ce14851..a416a27c 100644
--- a/include/ust_snprintf.h
+++ b/include/ust_snprintf.h
@@ -19,6 +19,7 @@
 #define UST_SNPRINTF
 
 #include <stdarg.h>
+#include <stddef.h>
 
 extern int ust_safe_vsnprintf(char *str, size_t n, const char *fmt, va_list ap);
 extern int ust_safe_snprintf(char *str, size_t n, const char *fmt, ...);
diff --git a/liblttng-ust-dl/ust_dl.h b/liblttng-ust-dl/ust_dl.h
index c8a06956..0ea21266 100644
--- a/liblttng-ust-dl/ust_dl.h
+++ b/liblttng-ust-dl/ust_dl.h
@@ -31,6 +31,7 @@ extern "C" {
  * SOFTWARE.
  */
 
+#include <stddef.h>
 #include <stdint.h>
 #include <unistd.h>
 #include <config.h>
diff --git a/liblttng-ust/getenv.c b/liblttng-ust/getenv.c
index 25740a50..a05653d7 100644
--- a/liblttng-ust/getenv.c
+++ b/liblttng-ust/getenv.c
@@ -19,6 +19,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <sys/types.h>
 #include <usterr-signal-safe.h>
 #include <helper.h>
diff --git a/liblttng-ust/jhash.h b/liblttng-ust/jhash.h
index da1e7dd0..416836ad 100644
--- a/liblttng-ust/jhash.h
+++ b/liblttng-ust/jhash.h
@@ -16,6 +16,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+#include <stddef.h>
 #include <urcu/compiler.h>
 #include <lttng/ust-endian.h>
 
diff --git a/liblttng-ust/lttng-context-cgroup-ns.c b/liblttng-ust/lttng-context-cgroup-ns.c
index d4053150..3526798f 100644
--- a/liblttng-ust/lttng-context-cgroup-ns.c
+++ b/liblttng-ust/lttng-context-cgroup-ns.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-cpu-id.c b/liblttng-ust/lttng-context-cpu-id.c
index a3252f15..c94ef714 100644
--- a/liblttng-ust/lttng-context-cpu-id.c
+++ b/liblttng-ust/lttng-context-cpu-id.c
@@ -28,6 +28,7 @@
 
 #define _GNU_SOURCE
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <lttng/ust-events.h>
diff --git a/liblttng-ust/lttng-context-ip.c b/liblttng-ust/lttng-context-ip.c
index fb922954..47f5af03 100644
--- a/liblttng-ust/lttng-context-ip.c
+++ b/liblttng-ust/lttng-context-ip.c
@@ -21,6 +21,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <lttng/ust-events.h>
diff --git a/liblttng-ust/lttng-context-ipc-ns.c b/liblttng-ust/lttng-context-ipc-ns.c
index c973dc86..64b3cd8e 100644
--- a/liblttng-ust/lttng-context-ipc-ns.c
+++ b/liblttng-ust/lttng-context-ipc-ns.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-mnt-ns.c b/liblttng-ust/lttng-context-mnt-ns.c
index d54c42aa..fb3e7beb 100644
--- a/liblttng-ust/lttng-context-mnt-ns.c
+++ b/liblttng-ust/lttng-context-mnt-ns.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-net-ns.c b/liblttng-ust/lttng-context-net-ns.c
index 9d6ded12..3da46d63 100644
--- a/liblttng-ust/lttng-context-net-ns.c
+++ b/liblttng-ust/lttng-context-net-ns.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-perf-counters.c b/liblttng-ust/lttng-context-perf-counters.c
index a6ff55b6..90f9db19 100644
--- a/liblttng-ust/lttng-context-perf-counters.c
+++ b/liblttng-ust/lttng-context-perf-counters.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <sys/mman.h>
 #include <sys/syscall.h>
 #include <lttng/ust-events.h>
diff --git a/liblttng-ust/lttng-context-pid-ns.c b/liblttng-ust/lttng-context-pid-ns.c
index 1581fb3d..71b42bd6 100644
--- a/liblttng-ust/lttng-context-pid-ns.c
+++ b/liblttng-ust/lttng-context-pid-ns.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-procname.c b/liblttng-ust/lttng-context-procname.c
index c6d02cf6..73f38878 100644
--- a/liblttng-ust/lttng-context-procname.c
+++ b/liblttng-ust/lttng-context-procname.c
@@ -21,6 +21,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <lttng/ust-events.h>
 #include <lttng/ust-tracer.h>
 #include <lttng/ringbuffer-config.h>
diff --git a/liblttng-ust/lttng-context-provider.c b/liblttng-ust/lttng-context-provider.c
index b51ef23f..edb1e9b2 100644
--- a/liblttng-ust/lttng-context-provider.c
+++ b/liblttng-ust/lttng-context-provider.c
@@ -21,6 +21,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <lttng/ust-context-provider.h>
diff --git a/liblttng-ust/lttng-context-pthread-id.c b/liblttng-ust/lttng-context-pthread-id.c
index 5f9faf85..d3328259 100644
--- a/liblttng-ust/lttng-context-pthread-id.c
+++ b/liblttng-ust/lttng-context-pthread-id.c
@@ -21,6 +21,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <pthread.h>
 #include <lttng/ust-events.h>
 #include <lttng/ust-tracer.h>
diff --git a/liblttng-ust/lttng-context-user-ns.c b/liblttng-ust/lttng-context-user-ns.c
index 04b940f6..d3e5192e 100644
--- a/liblttng-ust/lttng-context-user-ns.c
+++ b/liblttng-ust/lttng-context-user-ns.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-uts-ns.c b/liblttng-ust/lttng-context-uts-ns.c
index fb2d89f9..43faad0d 100644
--- a/liblttng-ust/lttng-context-uts-ns.c
+++ b/liblttng-ust/lttng-context-uts-ns.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-vegid.c b/liblttng-ust/lttng-context-vegid.c
index 70855688..12d095f7 100644
--- a/liblttng-ust/lttng-context-vegid.c
+++ b/liblttng-ust/lttng-context-vegid.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-veuid.c b/liblttng-ust/lttng-context-veuid.c
index b627a974..2576aaf0 100644
--- a/liblttng-ust/lttng-context-veuid.c
+++ b/liblttng-ust/lttng-context-veuid.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-vgid.c b/liblttng-ust/lttng-context-vgid.c
index 7ffaf683..db0c82d8 100644
--- a/liblttng-ust/lttng-context-vgid.c
+++ b/liblttng-ust/lttng-context-vgid.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-vpid.c b/liblttng-ust/lttng-context-vpid.c
index 11978e6e..aa2586ef 100644
--- a/liblttng-ust/lttng-context-vpid.c
+++ b/liblttng-ust/lttng-context-vpid.c
@@ -21,6 +21,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <lttng/ust-events.h>
diff --git a/liblttng-ust/lttng-context-vsgid.c b/liblttng-ust/lttng-context-vsgid.c
index 437b01e4..7613bdd6 100644
--- a/liblttng-ust/lttng-context-vsgid.c
+++ b/liblttng-ust/lttng-context-vsgid.c
@@ -23,6 +23,7 @@
 
 #define _GNU_SOURCE
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-vsuid.c b/liblttng-ust/lttng-context-vsuid.c
index 56f3d073..9c8fd585 100644
--- a/liblttng-ust/lttng-context-vsuid.c
+++ b/liblttng-ust/lttng-context-vsuid.c
@@ -23,6 +23,7 @@
 
 #define _GNU_SOURCE
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context-vtid.c b/liblttng-ust/lttng-context-vtid.c
index 36e5695d..0a29021d 100644
--- a/liblttng-ust/lttng-context-vtid.c
+++ b/liblttng-ust/lttng-context-vtid.c
@@ -21,6 +21,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <lttng/ust-events.h>
diff --git a/liblttng-ust/lttng-context-vuid.c b/liblttng-ust/lttng-context-vuid.c
index 54167519..ad4a07c5 100644
--- a/liblttng-ust/lttng-context-vuid.c
+++ b/liblttng-ust/lttng-context-vuid.c
@@ -22,6 +22,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/liblttng-ust/lttng-context.c b/liblttng-ust/lttng-context.c
index e408defc..bb6a9c9d 100644
--- a/liblttng-ust/lttng-context.c
+++ b/liblttng-ust/lttng-context.c
@@ -27,6 +27,7 @@
 #include <urcu-pointer.h>
 #include <usterr-signal-safe.h>
 #include <helper.h>
+#include <stddef.h>
 #include <string.h>
 #include <assert.h>
 
diff --git a/liblttng-ust/lttng-filter-interpreter.c b/liblttng-ust/lttng-filter-interpreter.c
index 59bc72cd..f246ce2a 100644
--- a/liblttng-ust/lttng-filter-interpreter.c
+++ b/liblttng-ust/lttng-filter-interpreter.c
@@ -25,8 +25,9 @@
  */
 
 #define _LGPL_SOURCE
-#include <urcu-pointer.h>
+#include <stddef.h>
 #include <stdint.h>
+#include <urcu-pointer.h>
 #include <byteswap.h>
 #include "lttng-filter.h"
 #include "string-utils.h"
diff --git a/liblttng-ust/lttng-filter-specialize.c b/liblttng-ust/lttng-filter-specialize.c
index e269db6a..21e35923 100644
--- a/liblttng-ust/lttng-filter-specialize.c
+++ b/liblttng-ust/lttng-filter-specialize.c
@@ -25,6 +25,8 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
+
 #include "lttng-filter.h"
 #include <lttng/align.h>
 
diff --git a/liblttng-ust/lttng-filter-validator.c b/liblttng-ust/lttng-filter-validator.c
index acac7ce7..49e2e43d 100644
--- a/liblttng-ust/lttng-filter-validator.c
+++ b/liblttng-ust/lttng-filter-validator.c
@@ -25,6 +25,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <urcu-bp.h>
 #include <time.h>
 #include "lttng-filter.h"
diff --git a/liblttng-ust/lttng-filter.c b/liblttng-ust/lttng-filter.c
index d52658ae..fb8eefdd 100644
--- a/liblttng-ust/lttng-filter.c
+++ b/liblttng-ust/lttng-filter.c
@@ -25,6 +25,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <urcu/rculist.h>
 #include "lttng-filter.h"
 
diff --git a/liblttng-ust/lttng-hash-helper.h b/liblttng-ust/lttng-hash-helper.h
index bddc7c46..0df5f288 100644
--- a/liblttng-ust/lttng-hash-helper.h
+++ b/liblttng-ust/lttng-hash-helper.h
@@ -24,6 +24,7 @@
  */
 
 #include <assert.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <urcu/compiler.h>
 
diff --git a/liblttng-ust/lttng-ring-buffer-client.h b/liblttng-ust/lttng-ring-buffer-client.h
index 7078938d..62d1ff82 100644
--- a/liblttng-ust/lttng-ring-buffer-client.h
+++ b/liblttng-ust/lttng-ring-buffer-client.h
@@ -20,6 +20,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stddef.h>
 #include <stdint.h>
 #include <lttng/ust-events.h>
 #include "lttng/bitfield.h"
diff --git a/liblttng-ust/lttng-ring-buffer-metadata-client.h b/liblttng-ust/lttng-ring-buffer-metadata-client.h
index 45340a7b..05d3f1bb 100644
--- a/liblttng-ust/lttng-ring-buffer-metadata-client.h
+++ b/liblttng-ust/lttng-ring-buffer-metadata-client.h
@@ -20,6 +20,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stddef.h>
 #include <stdint.h>
 #include <lttng/ust-events.h>
 #include "lttng/bitfield.h"
diff --git a/liblttng-ust/lttng-ust-comm.c b/liblttng-ust/lttng-ust-comm.c
index 9d0c010d..838bf08b 100644
--- a/liblttng-ust/lttng-ust-comm.c
+++ b/liblttng-ust/lttng-ust-comm.c
@@ -21,6 +21,7 @@
 
 #define _LGPL_SOURCE
 #define _GNU_SOURCE
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/mman.h>
diff --git a/liblttng-ust/lttng-ust-statedump-provider.h b/liblttng-ust/lttng-ust-statedump-provider.h
index b0c43cf7..474e2d22 100644
--- a/liblttng-ust/lttng-ust-statedump-provider.h
+++ b/liblttng-ust/lttng-ust-statedump-provider.h
@@ -31,6 +31,7 @@ extern "C" {
  * SOFTWARE.
  */
 
+#include <stddef.h>
 #include <stdint.h>
 #include <unistd.h>
 #include <lttng/ust-events.h>
diff --git a/liblttng-ust/string-utils.h b/liblttng-ust/string-utils.h
index 94e9a5c1..414b6e6a 100644
--- a/liblttng-ust/string-utils.h
+++ b/liblttng-ust/string-utils.h
@@ -24,6 +24,7 @@
  */
 
 #include <stdbool.h>
+#include <stddef.h>
 
 bool strutils_is_star_glob_pattern(const char *pattern);
 bool strutils_is_star_at_the_end_only_glob_pattern(const char *pattern);
diff --git a/liblttng-ust/ust-core.c b/liblttng-ust/ust-core.c
index 76f729a6..255ad963 100644
--- a/liblttng-ust/ust-core.c
+++ b/liblttng-ust/ust-core.c
@@ -19,6 +19,7 @@
  */
 
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <stdlib.h>
 #include <lttng/ust-events.h>
 #include <usterr-signal-safe.h>
diff --git a/liblttng-ust/ust_lib.h b/liblttng-ust/ust_lib.h
index df372dc7..425bd383 100644
--- a/liblttng-ust/ust_lib.h
+++ b/liblttng-ust/ust_lib.h
@@ -32,6 +32,7 @@ extern "C" {
  * SOFTWARE.
  */
 
+#include <stddef.h>
 #include <stdint.h>
 #include <unistd.h>
 
diff --git a/libringbuffer/backend.h b/libringbuffer/backend.h
index 46022ad3..52e632d8 100644
--- a/libringbuffer/backend.h
+++ b/libringbuffer/backend.h
@@ -26,6 +26,7 @@
  * the reader in flight recorder mode.
  */
 
+#include <stddef.h>
 #include <unistd.h>
 
 /* Internal helpers */
diff --git a/libringbuffer/backend_internal.h b/libringbuffer/backend_internal.h
index e597cf4d..f492cc3e 100644
--- a/libringbuffer/backend_internal.h
+++ b/libringbuffer/backend_internal.h
@@ -23,6 +23,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stddef.h>
 #include <unistd.h>
 #include <urcu/compiler.h>
 
diff --git a/libringbuffer/frontend.h b/libringbuffer/frontend.h
index 2a9fd09a..016fc530 100644
--- a/libringbuffer/frontend.h
+++ b/libringbuffer/frontend.h
@@ -28,6 +28,7 @@
  *
  * See ring_buffer_frontend.c for more information on wait-free algorithms.
  */
+#include <stddef.h>
 
 #include <urcu/compiler.h>
 #include <urcu/uatomic.h>
diff --git a/libringbuffer/frontend_api.h b/libringbuffer/frontend_api.h
index bc1fd122..8a320061 100644
--- a/libringbuffer/frontend_api.h
+++ b/libringbuffer/frontend_api.h
@@ -30,10 +30,13 @@
  * See frontend.h for channel allocation and read-side API.
  */
 
-#include "frontend.h"
+#include <stddef.h>
+
 #include <urcu-bp.h>
 #include <urcu/compiler.h>
 
+#include "frontend.h"
+
 /**
  * lib_ring_buffer_get_cpu - Precedes ring buffer reserve/commit.
  *
diff --git a/libringbuffer/ring_buffer_backend.c b/libringbuffer/ring_buffer_backend.c
index 2dea1db5..b69dc5e6 100644
--- a/libringbuffer/ring_buffer_backend.c
+++ b/libringbuffer/ring_buffer_backend.c
@@ -20,6 +20,7 @@
 
 #define _GNU_SOURCE
 #define _LGPL_SOURCE
+#include <stddef.h>
 #include <unistd.h>
 #include <urcu/arch.h>
 #include <limits.h>
diff --git a/libringbuffer/shm.h b/libringbuffer/shm.h
index 1f293e38..b5d1343a 100644
--- a/libringbuffer/shm.h
+++ b/libringbuffer/shm.h
@@ -21,6 +21,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stddef.h>
 #include <stdint.h>
 #include <usterr-signal-safe.h>
 #include <urcu/compiler.h>
diff --git a/libringbuffer/shm_types.h b/libringbuffer/shm_types.h
index 11076d29..94ccfa56 100644
--- a/libringbuffer/shm_types.h
+++ b/libringbuffer/shm_types.h
@@ -22,6 +22,7 @@
  */
 
 #include <stdint.h>
+#include <stddef.h>
 #include <limits.h>
 #include "shm_internal.h"
 
diff --git a/snprintf/fvwrite.h b/snprintf/fvwrite.h
index 65536212..7ba16dc5 100644
--- a/snprintf/fvwrite.h
+++ b/snprintf/fvwrite.h
@@ -35,6 +35,8 @@
 /*
  * I/O descriptors for __sfvwrite().
  */
+#include <stddef.h>
+
 struct __lttng_ust_siov {
 	void	*iov_base;
 	size_t	iov_len;
diff --git a/snprintf/patient_write.c b/snprintf/patient_write.c
index b6620cb2..9bd2913f 100644
--- a/snprintf/patient_write.c
+++ b/snprintf/patient_write.c
@@ -17,6 +17,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+#include <stddef.h>
+
 /* write() */
 #include <unistd.h>
 
diff --git a/snprintf/snprintf.c b/snprintf/snprintf.c
index a6263979..68b45776 100644
--- a/snprintf/snprintf.c
+++ b/snprintf/snprintf.c
@@ -32,6 +32,7 @@
  */
 
 #include <limits.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdarg.h>
diff --git a/snprintf/various.h b/snprintf/various.h
index 30bedd04..638428fd 100644
--- a/snprintf/various.h
+++ b/snprintf/various.h
@@ -34,6 +34,7 @@
 #define UST_SNPRINTF_VARIOUS_H
 
 #include <stdarg.h>
+#include <stddef.h>
 
 struct __lttng_ust_sbuf {
         unsigned char *_base;
diff --git a/snprintf/wcio.h b/snprintf/wcio.h
index 0c955e5c..453a41b1 100644
--- a/snprintf/wcio.h
+++ b/snprintf/wcio.h
@@ -32,6 +32,8 @@
 #ifndef _WCIO_H_
 #define _WCIO_H_
 
+#include <stddef.h>
+
 /* minimal requirement of SUSv2 */
 #define WCIO_UNGETWC_BUFSIZE 1
 
diff --git a/tests/hello.cxx/ust_tests_hello.h b/tests/hello.cxx/ust_tests_hello.h
index ddb83587..22914eef 100644
--- a/tests/hello.cxx/ust_tests_hello.h
+++ b/tests/hello.cxx/ust_tests_hello.h
@@ -27,6 +27,7 @@
  */
 
 #include <lttng/tracepoint.h>
+#include <stddef.h>
 
 TRACEPOINT_ENUM(ust_tests_hello, my_enum,
 	TP_ENUM_VALUES(
diff --git a/tests/hello/ust_tests_hello.h b/tests/hello/ust_tests_hello.h
index 372828f8..a140ca83 100644
--- a/tests/hello/ust_tests_hello.h
+++ b/tests/hello/ust_tests_hello.h
@@ -28,6 +28,7 @@
 
 #include <lttng/tracepoint.h>
 #include <stdbool.h>
+#include <stddef.h>
 
 TRACEPOINT_EVENT(ust_tests_hello, tptest,
 	TP_ARGS(int, anint, int, netint, long *, values,
diff --git a/tests/test-app-ctx/hello.c b/tests/test-app-ctx/hello.c
index 197df21e..85064846 100644
--- a/tests/test-app-ctx/hello.c
+++ b/tests/test-app-ctx/hello.c
@@ -32,6 +32,7 @@
  */
 struct mmsghdr;
 #include <arpa/inet.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <stdbool.h>
 
diff --git a/tests/test-app-ctx/ust_tests_hello.h b/tests/test-app-ctx/ust_tests_hello.h
index e518b0d4..f16a75d5 100644
--- a/tests/test-app-ctx/ust_tests_hello.h
+++ b/tests/test-app-ctx/ust_tests_hello.h
@@ -27,6 +27,7 @@
  */
 
 #include <lttng/tracepoint.h>
+#include <stddef.h>
 #include <stdbool.h>
 
 TRACEPOINT_EVENT(ust_tests_hello, tptest,
-- 
2.34.1