en Copyright 2015 Java http://172.16.0.5:8080/history/llvm-project-15.0.7/clang/test/SemaCXX/externc-ifunc-resolver.cpp#9ba8c402 Fix behavior of ifuncs with 'used' extern "C" static functionsWe expect that `extern "C"` static functions to be usable in things likeinline assembly, as well as ifuncs:See the bug report here: https://github.com/llvm/llvm-project/issues/54549However, we were diagnosing this as 'not defined', because theifunc's attempt to look up its resolver would generate a declared IRfunction.Additionally, as background, the way we allow these static extern "C"functions to work in inline assembly is by making an alias with the Cmangling in MOST situations to the version we emit withinternal-linkage/mangling.The problem here was multi-fold: First- We generated the alias after theifunc was checked, so the function by that name didn't exist yet.Second, the ifunc's generation caused a symbol to exist under the nameof the alias already (the declared function above), which suppressed thealias generation.This patch fixes all of this by moving the checking of ifuncs/CFE aliasesuntil AFTER we have generated the extern-C alias. Then, it does a'fixup' around the GlobalIFunc to make sure we correct the reference.Differential Revision: https://reviews.llvm.org/D122608 List of files: /llvm-project-15.0.7/clang/test/SemaCXX/externc-ifunc-resolver.cpp Mon, 28 Mar 2022 15:57:50 +0000 Erich Keane <erich.keane@intel.com>