From ccb9aa7f2db7f5e867c8025d7da00cf147222854 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 17 May 2022 09:53:25 +0200
Subject: Handle backtrace()/libexecinfo for OpenBSD

This functionality is available as built-in from OpenBSD 7.0.
---
 libbutl/backtrace.cxx | 8 +++++++-
 libbutl/buildfile     | 8 ++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/libbutl/backtrace.cxx b/libbutl/backtrace.cxx
index c0cf472..347e231 100644
--- a/libbutl/backtrace.cxx
+++ b/libbutl/backtrace.cxx
@@ -7,7 +7,8 @@
 // complications of the build scripts/makefiles.
 //
 // With glibc linking with -rdynamic gives (non-static) function names.
-// FreeBSD/NetBSD requires explicitly linking -lexecinfo.
+// FreeBSD/NetBSD requires explicitly linking -lexecinfo. OpenBSD only has
+// this functionality built-in from 7.0 and requires -lexecinfo.
 //
 // Note that some libc implementation on Linux (most notably, musl), don't
 // support this, at least not out of the box.
@@ -18,6 +19,11 @@
       defined(__FreeBSD__) || \
       defined(__NetBSD__)
 #    define LIBBUTL_BACKTRACE
+#  elif defined (__OpenBSD__)
+#    include <sys/param.h> // OpenBSD (yyyymm)
+#    if OpenBSD >= 202110  // 7.0 was released in October 2021.
+#      define LIBBUTL_BACKTRACE
+#    endif
 #  endif
 #else
 #  if defined(__GLIBC__) || \
diff --git a/libbutl/buildfile b/libbutl/buildfile
index 4dd952c..6c490af 100644
--- a/libbutl/buildfile
+++ b/libbutl/buildfile
@@ -65,6 +65,14 @@ switch $tclass, $tsys
 
   case 'bsd', 'freebsd' | 'netbsd'
     cxx.libs += -lexecinfo
+
+  case 'bsd', 'openbsd'
+  {
+    # Built-in libexecinfo is only available since OpenBSD 7.0.
+    #
+    if (([uint64] $regex.replace($cxx.target.version, '(\d+)\..+', '\1')) >= 7)
+      cxx.libs += -lexecinfo
+  }
 }
 
 if! $windows
-- 
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