[PATCH, libphobos] Add explicit casts in emutls.d to fix build on some systems

[Johannes Pfau]

This fixes builds on systems where __builtin_machine_uint != size_t. In D,
casts from larger to smaller integer size need to be made explicitly.
Most notably this fixes --disable-tls for MIPS64 systems.

libphobos/ChangeLog:

2019-05-02  Johannes Pfau  <johannesp...@gmail.com>

        * libdruntime/gcc/emutls.d: Add explicit casts to size_t.


---
 libphobos/libdruntime/gcc/emutls.d | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libphobos/libdruntime/gcc/emutls.d 
b/libphobos/libdruntime/gcc/emutls.d
index 461f20d9e28..1f8bbf5d69e 100644
--- a/libphobos/libdruntime/gcc/emutls.d
+++ b/libphobos/libdruntime/gcc/emutls.d
@@ -197,7 +197,7 @@ void** emutlsAlloc(shared __emutls_object* obj) nothrow 
@nogc
      emutls_destroy accordingly.  */
     if ((cast() obj).align_ <= pointerSize)
     {
-        ptr = malloc((cast() obj).size + pointerSize);
+        ptr = malloc(cast(size_t)((cast() obj).size + pointerSize));
         if (ptr == null)
             abort();
         (cast(void**) ptr)[0] = ptr;
@@ -205,7 +205,7 @@ void** emutlsAlloc(shared __emutls_object* obj) nothrow 
@nogc
     }
     else
     {
-        ptr = malloc(obj.size + pointerSize + obj.align_ - 1);
+        ptr = malloc(cast(size_t)(obj.size + pointerSize + obj.align_ - 1));
         if (ptr == null)
             abort();
         ret = cast(void*)((cast(pointer)(ptr + pointerSize + obj.align_ - 1)) 
& ~cast(
@@ -214,9 +214,9 @@ void** emutlsAlloc(shared __emutls_object* obj) nothrow 
@nogc
     }
 
     if (obj.templ)
-        memcpy(ret, cast(ubyte*) obj.templ, cast() obj.size);
+        memcpy(ret, cast(ubyte*) obj.templ, cast(size_t) obj.size);
     else
-        memset(ret, 0, cast() obj.size);
+        memset(ret, 0, cast(size_t) obj.size);
 
     return cast(void**) ret;
 }
-- 
2.19.2