[libcxx-commits] [PATCH] D126866: [libcxxabi] Check __SEH__, when checking if ARM EHABI is implied

Martin Storsjö via Phabricator via libcxx-commits libcxx-commits at lists.llvm.org
Thu Jun 2 02:35:05 PDT 2022

mstorsjo created this revision.
mstorsjo added reviewers: MaskRay, efriedma, zzheng, ldionne.
Herald added subscribers: StephenFan, kristof.beyls.
Herald added a project: All.
mstorsjo requested review of this revision.
Herald added a project: libc++abi.
Herald added a reviewer: libc++abi.

ARM EHABI isn't signalled by any specific compiler builtin define,
but is implied by the lack of defines specifying any other
exception handling mechanism, `__USING_SJLJ_EXCEPTIONS__` or

As Windows SEH also can be used for unwinding, check for the
`__SEH__` define too, in the same way.

  rG LLVM Github Monorepo



Index: libcxxabi/include/__cxxabi_config.h
--- libcxxabi/include/__cxxabi_config.h
+++ libcxxabi/include/__cxxabi_config.h
@@ -10,7 +10,7 @@
 #define ____CXXABI_CONFIG_H
 #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) &&                 \
-    !defined(__ARM_DWARF_EH__)
+    !defined(__ARM_DWARF_EH__) && !defined(__SEH__)

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