Runtime linker: Break m32 allocator out into its own file

This makes the code a little more modular and allows the removal of some
CPP hackery. By providing dummy implementations of of the `m32_*`
functions (which simply call `errorBelch`) it means that the call sites
for these functions are syntax checked even when `RTS_LINKER_USE_MMAP`
is `0`.

Also changes some size parameter types from `unsigned int` to `size_t`.

Test Plan: Validate on Linux, OS X and Windows

Reviewers: Phyx, hsyl20, bgamari, simonmar, austin

Reviewed By: simonmar, austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2237

1 files changed, 6 insertions, 6 deletions

diff --git a/rts/posix/OSMem.c b/rts/posix/OSMem.c
index 5c997ababb..5ff4bc86e4 100644
--- a/rts/posix/OSMem.c
+++ b/rts/posix/OSMem.c
@@ -315,20 +315,20 @@ void osFreeAllMBlocks(void)
     }
 }
 
-W_ getPageSize (void)
+size_t getPageSize (void)
 {
-    static W_ pageSize = 0;
-    if (pageSize) {
-        return pageSize;
-    } else {
+    static size_t pageSize = 0;
+
+    if (pageSize == 0) {
         long ret;
         ret = sysconf(_SC_PAGESIZE);
         if (ret == -1) {
            barf("getPageSize: cannot get page size");
         }
         pageSize = ret;
-        return ret;
     }
+
+    return pageSize;
 }
 
 /* Returns 0 if physical memory size cannot be identified */