[PATCH] D157189: [llvm-exegesis] Don't try to use SYS_rseq if it's not defined.

[Romain Geissler via Phabricator via llvm-commits]

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When compiling against recent glibc (>= 2.35) but old kernel headers (< 4.18), `SYS_rseq` is not defined and thus llvm-exegesis fails to build. So also check that `SYS_rseq` is defined before trying to use it.

Fixes https://github.com/llvm/llvm-project/issues/64456


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157189

Files:
  llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp


Index: llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
===================================================================
--- llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
+++ llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
@@ -41,7 +41,7 @@
 
 #if defined(__GLIBC__) && __has_include(<sys/rseq.h>) && defined(HAVE_BUILTIN_THREAD_POINTER)
 #include <sys/rseq.h>
-#ifdef RSEQ_SIG
+#if defined(RSEQ_SIG) && defined(SYS_rseq)
 #define GLIBC_INITS_RSEQ
 #endif
 #endif


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