Commit 3468b59e18b ("tcg: enable multiple TCG contexts in softmmu")
introduced use of typedef/prototypes declared in "tcg/tcg.h" without
including it. This was not a problem because "tcg/tcg.h" is pulled
in by "exec/cpu_ldst.h". To be able to remove this header there, we
first need to include it here in op_helper.c, else we get:

  accel/tcg/tcg-accel-ops-mttcg.c: In function ‘mttcg_cpu_thread_fn’:
  accel/tcg/tcg-accel-ops-mttcg.c:52:5: error: implicit declaration of function ‘tcg_register_thread’; did you mean ‘rcu_register_thread’? [-Werror=implicit-function-declaration]
     52 |     tcg_register_thread();
        |     ^~~~~~~~~~~~~~~~~~~
        |     rcu_register_thread
  accel/tcg/tcg-accel-ops-mttcg.c:52:5: error: nested extern declaration of ‘tcg_register_thread’ [-Werror=nested-externs]
  cc1: all warnings being treated as errors

  accel/tcg/tcg-accel-ops-rr.c: In function ‘rr_cpu_thread_fn’:
  accel/tcg/tcg-accel-ops-rr.c:153:5: error: implicit declaration of function ‘tcg_register_thread’; did you mean ‘rcu_register_thread’? [-Werror=implicit-function-declaration]
    153 |     tcg_register_thread();
        |     ^~~~~~~~~~~~~~~~~~~
        |     rcu_register_thread
  accel/tcg/tcg-accel-ops-rr.c:153:5: error: nested extern declaration of ‘tcg_register_thread’ [-Werror=nested-externs]
  cc1: all warnings being treated as errors

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 accel/tcg/tcg-accel-ops-mttcg.c | 1 +
 accel/tcg/tcg-accel-ops-rr.c    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/accel/tcg/tcg-accel-ops-mttcg.c b/accel/tcg/tcg-accel-ops-mttcg.c
index 42973fb062b..ddbca6c5b8c 100644
--- a/accel/tcg/tcg-accel-ops-mttcg.c
+++ b/accel/tcg/tcg-accel-ops-mttcg.c
@@ -32,6 +32,7 @@
 #include "exec/exec-all.h"
 #include "hw/boards.h"
 
+#include "tcg/tcg.h"
 #include "tcg-accel-ops.h"
 #include "tcg-accel-ops-mttcg.h"
 
diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
index 4a66055e0d7..1bb1d0f8f1c 100644
--- a/accel/tcg/tcg-accel-ops-rr.c
+++ b/accel/tcg/tcg-accel-ops-rr.c
@@ -32,6 +32,7 @@
 #include "exec/exec-all.h"
 #include "hw/boards.h"
 
+#include "tcg/tcg.h"
 #include "tcg-accel-ops.h"
 #include "tcg-accel-ops-rr.h"
 #include "tcg-accel-ops-icount.h"
-- 
2.26.2

Philippe Mathieu-Daudé <f4bug@amsat.org> writes:

> Commit 3468b59e18b ("tcg: enable multiple TCG contexts in softmmu")
> introduced use of typedef/prototypes declared in "tcg/tcg.h" without
> including it. This was not a problem because "tcg/tcg.h" is pulled
> in by "exec/cpu_ldst.h". To be able to remove this header there, we
> first need to include it here in op_helper.c, else we get:
>
>   accel/tcg/tcg-accel-ops-mttcg.c: In function ‘mttcg_cpu_thread_fn’:
>   accel/tcg/tcg-accel-ops-mttcg.c:52:5: error: implicit declaration of function ‘tcg_register_thread’; did you mean ‘rcu_register_thread’? [-Werror=implicit-function-declaration]
>      52 |     tcg_register_thread();
>         |     ^~~~~~~~~~~~~~~~~~~
>         |     rcu_register_thread
>   accel/tcg/tcg-accel-ops-mttcg.c:52:5: error: nested extern declaration of ‘tcg_register_thread’ [-Werror=nested-externs]
>   cc1: all warnings being treated as errors
>
>   accel/tcg/tcg-accel-ops-rr.c: In function ‘rr_cpu_thread_fn’:
>   accel/tcg/tcg-accel-ops-rr.c:153:5: error: implicit declaration of function ‘tcg_register_thread’; did you mean ‘rcu_register_thread’? [-Werror=implicit-function-declaration]
>     153 |     tcg_register_thread();
>         |     ^~~~~~~~~~~~~~~~~~~
>         |     rcu_register_thread
>   accel/tcg/tcg-accel-ops-rr.c:153:5: error: nested extern declaration of ‘tcg_register_thread’ [-Werror=nested-externs]
>   cc1: all warnings being treated as errors
>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>  accel/tcg/tcg-accel-ops-mttcg.c | 1 +
>  accel/tcg/tcg-accel-ops-rr.c    | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/accel/tcg/tcg-accel-ops-mttcg.c b/accel/tcg/tcg-accel-ops-mttcg.c
> index 42973fb062b..ddbca6c5b8c 100644
> --- a/accel/tcg/tcg-accel-ops-mttcg.c
> +++ b/accel/tcg/tcg-accel-ops-mttcg.c
> @@ -32,6 +32,7 @@
>  #include "exec/exec-all.h"
>  #include "hw/boards.h"
>  
> +#include "tcg/tcg.h"
>  #include "tcg-accel-ops.h"
>  #include "tcg-accel-ops-mttcg.h"
>  
> diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
> index 4a66055e0d7..1bb1d0f8f1c 100644
> --- a/accel/tcg/tcg-accel-ops-rr.c
> +++ b/accel/tcg/tcg-accel-ops-rr.c
> @@ -32,6 +32,7 @@
>  #include "exec/exec-all.h"
>  #include "hw/boards.h"
>  
> +#include "tcg/tcg.h"
>  #include "tcg-accel-ops.h"
>  #include "tcg-accel-ops-rr.h"
>  #include "tcg-accel-ops-icount.h"

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée