python
diff --git a/‎Misc/NEWS.d/next/Build/2024-05-11-15-11-30.gh-issue-118943.VI_MnY.rst
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+3Lines changed: 3 additions & 0 deletions b/‎Misc/NEWS.d/next/Build/2024-05-11-15-11-30.gh-issue-118943.VI_MnY.rst
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diff --git a/‎Tools/jit/_targets.py
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+12-7Lines changed: 12 additions & 7 deletions b/‎Tools/jit/_targets.py
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+12-7Lines changed: 12 additions & 7 deletions
@@ -0,0 +1,3 @@
+Fix a possible race condition affecting parallel builds configured with
+``--enable-experimental-jit``, in which compilation errors could be caused
+by an incompletely-generated header file.
@@ -212,13 +212,18 @@ def build(
         ):
             return
         stencil_groups = asyncio.run(self._build_stencils())
-        with jit_stencils.open("w") as file:
-            file.write(digest)
-            if comment:
-                file.write(f"// {comment}\n\n")
-            file.write("")
-            for line in _writer.dump(stencil_groups):
-                file.write(f"{line}\n")
+        jit_stencils_new = out / "jit_stencils.h.new"
+        try:
+            with jit_stencils_new.open("w") as file:
+                file.write(digest)
+                if comment:
+                    file.write(f"// {comment}\n")
+                file.write("\n")
+                for line in _writer.dump(stencil_groups):
+                    file.write(f"{line}\n")
+            jit_stencils_new.replace(jit_stencils)
+        finally:
+            jit_stencils_new.unlink(missing_ok=True)
 
 
 class _COFF(