[libcxx-commits] [libcxx] [libcxx] Support ABI symbol sizes on macOS (PR #75623)

[Louis Dionne via libcxx-commits]

================
@@ -123,6 +123,40 @@ def adjust_mangled_name(name):
     return name[1:]
 
 
+def extract_object_sizes_from_map(mapfilename: str):
+    maplines = []
+    result = {}
+
+    with open(mapfilename, "r") as f:
+        maplines = f.readlines()
+
+    if len(maplines) == 0:
+        return {}
+
+    # Yes, this is fragile.
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ldionne wrote:

Does this only work with a mapfile generated on Apple platforms, or is that format cross-platform? I haven't played around with mapfiles much in the past, so I'm not very familiar with those.

https://github.com/llvm/llvm-project/pull/75623