[gcc(refs/users/iains/heads/d-for-darwin)] D, Darwin : Update pthreads sizes.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:08ff05221a1f6c452e08b8b466b5e12ad3eb5b95

commit 08ff05221a1f6c452e08b8b466b5e12ad3eb5b95
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Fri Dec 11 00:37:57 2020 +0000

    D, Darwin : Update pthreads sizes.
    
    The size of struct pthread changed at Darwin14 (macOS 10.10).
    Update the type bindings accordingly.
    
    libphobos/ChangeLog:
    
            * libdruntime/core/sys/posix/sys/types.d: Update sizes after
            macOS 10.10.

Diff:
---
 libphobos/libdruntime/core/sys/posix/sys/types.d | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/libphobos/libdruntime/core/sys/posix/sys/types.d b/libphobos/libdruntime/core/sys/posix/sys/types.d
index abcea99019f..5ff9be4e1a5 100644
--- a/libphobos/libdruntime/core/sys/posix/sys/types.d
+++ b/libphobos/libdruntime/core/sys/posix/sys/types.d
@@ -899,9 +899,13 @@ else version (CRuntime_Musl)
 }
 else version (Darwin)
 {
+    import core.sys.darwin.config;
     version (D_LP64)
     {
-        enum __PTHREAD_SIZE__               = 8176;
+        static if (__traits(getTargetInfo, "osxVersionMin") >= __MAC_10_10)
+            enum __PTHREAD_SIZE__           = 8176;
+        else
+            enum __PTHREAD_SIZE__           = 1168;
         enum __PTHREAD_ATTR_SIZE__          = 56;
         enum __PTHREAD_MUTEXATTR_SIZE__     = 8;
         enum __PTHREAD_MUTEX_SIZE__         = 56;
@@ -913,7 +917,10 @@ else version (Darwin)
     }
     else
     {
-        enum __PTHREAD_SIZE__               = 4088;
+        static if (__traits(getTargetInfo, "osxVersionMin") >= __MAC_10_10)
+            enum __PTHREAD_SIZE__           = 4088;
+        else
+            enum __PTHREAD_SIZE__           = 596;
         enum __PTHREAD_ATTR_SIZE__          = 36;
         enum __PTHREAD_MUTEXATTR_SIZE__     = 8;
         enum __PTHREAD_MUTEX_SIZE__         = 40;