GH-130673: Gracefully handle missing sections in JIT build (GH-130906)

diff --git a/Misc/NEWS.d/next/Build/2025-03-06-20-55-34.gh-issue-130673.T3RSCI.rst b/Misc/NEWS.d/next/Build/2025-03-06-20-55-34.gh-issue-130673.T3RSCI.rst
new file mode 100644 (file)
index 0000000..20c52c3
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-03-06-20-55-34.gh-issue-130673.T3RSCI.rst
@@ -0,0 +1,2 @@
+Fix potential ``KeyError`` when handling object sections during JIT building
+process.

diff --git a/Tools/jit/_targets.py b/Tools/jit/_targets.py
index b5a839e07d4dafb359d1fcaf8cca1bc3754d1a99..b3b065652e0bb0d6905319fa8f81e9b4a4a79344 100644 (file)
--- a/Tools/jit/_targets.py
+++ b/Tools/jit/_targets.py
@@ -323,7 +323,11 @@ class _ELF(
         if section_type == "SHT_RELA":
             assert "SHF_INFO_LINK" in flags, flags
             assert not section["Symbols"]
-            value, base = group.symbols[section["Info"]]
+            maybe_symbol = group.symbols.get(section["Info"])
+            if maybe_symbol is None:
+                # These are relocations for a section we're not emitting. Skip:
+                return
+            value, base = maybe_symbol
             if value is _stencils.HoleValue.CODE:
                 stencil = group.code
             else: