From 244389699ed7f7c3429967db56eaa60d82fa35de Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Wed, 28 Jul 2021 14:00:37 +0200
Subject: [PATCH] Drop checks for pid_t from autoconf and CMake

This type should always be defined in sys/types.h on any non-ancient
Unix system, so don't bother checking for it, which is not only wasteful
but can even be harmful because it can conflict with pid_t definitions
in the other libraries under Windows, where we (wrongly) define it as
int (which is actually a bug in autoconf, which was recently fixed, see
https://savannah.gnu.org/support/index.php?110296) when using CMake.

So just don't define it at all: it should be already defined under Unix
and we don't use it under MSW anyhow.

See https://github.com/microsoft/vcpkg/issues/19110

See #18150.
---
 build/cmake/setup.cmake |  2 +-
 build/cmake/setup.h.in  |  3 ---
 configure               | 11 -----------
 configure.in            |  2 --
 setup.h.in              |  3 ---
 setup.h_vms             |  3 ---
 6 files changed, 1 insertion(+), 23 deletions(-)

diff --git a/build/cmake/setup.cmake b/build/cmake/setup.cmake
index 45097e02d9..5c41065187 100644
--- a/build/cmake/setup.cmake
+++ b/build/cmake/setup.cmake
@@ -648,7 +648,7 @@ endif()
 
 # Check size and availability of various types
 set(SYSTYPES
-    pid_t size_t
+    size_t
     wchar_t int long short
     gid_t uid_t
     )
diff --git a/build/cmake/setup.h.in b/build/cmake/setup.h.in
index b400d2eda9..bf6037b0cb 100644
--- a/build/cmake/setup.h.in
+++ b/build/cmake/setup.h.in
@@ -26,9 +26,6 @@
 /* Define to `long' if <sys/types.h> doesn't define.  */
 #cmakedefine off_t long
 
-/* Define to `int' if <sys/types.h> doesn't define.  */
-#cmakedefine pid_t int
-
 /* Define to `unsigned' if <sys/types.h> doesn't define.  */
 #cmakedefine size_t unsigned
 
diff --git a/configure b/configure
index 107a4e5fd1..26f5bf4f5f 100755
--- a/configure
+++ b/configure
@@ -29757,17 +29757,6 @@ _ACEOF
 
 fi
 
-ac_fn_c_check_type "$LINENO" "pid_t" "ac_cv_type_pid_t" "$ac_includes_default"
-if test "x$ac_cv_type_pid_t" = xyes; then :
-
-else
-
-cat >>confdefs.h <<_ACEOF
-#define pid_t int
-_ACEOF
-
-fi
-
 ac_fn_c_check_type "$LINENO" "size_t" "ac_cv_type_size_t" "$ac_includes_default"
 if test "x$ac_cv_type_size_t" = xyes; then :
 
diff --git a/configure.in b/configure.in
index 57a7ba4610..e28342bafb 100644
--- a/configure.in
+++ b/configure.in
@@ -4088,8 +4088,6 @@ dnl   defines mode_t if not already defined
 AC_TYPE_MODE_T
 dnl   defines off_t if not already defined
 AC_TYPE_OFF_T
-dnl   defines pid_t if not already defined
-AC_TYPE_PID_T
 dnl   defines size_t if not already defined
 AC_TYPE_SIZE_T
 
diff --git a/setup.h.in b/setup.h.in
index 9ca552a4ce..53768487bb 100644
--- a/setup.h.in
+++ b/setup.h.in
@@ -26,9 +26,6 @@
 /* Define to `long' if <sys/types.h> doesn't define.  */
 #undef off_t
 
-/* Define to `int' if <sys/types.h> doesn't define.  */
-#undef pid_t
-
 /* Define to `unsigned' if <sys/types.h> doesn't define.  */
 #undef size_t
 
diff --git a/setup.h_vms b/setup.h_vms
index 261a3ea2c6..c9ebf676ff 100644
--- a/setup.h_vms
+++ b/setup.h_vms
@@ -45,9 +45,6 @@
 /* Define to `long' if <sys/types.h> doesn't define.  */
 #undef off_t
 
-/* Define to `int' if <sys/types.h> doesn't define.  */
-#undef pid_t
-
 /* Define to `unsigned' if <sys/types.h> doesn't define.  */
 #undef size_t