From 0417338bbbe28377a5c20e1b0d38dc802ea06b2b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 29 Oct 2019 15:04:30 +0200
Subject: Only enable backtrace support on Linux if using glibc

Other libc implementations, for example musl, don't support this out of the
box.
---
 libbutl/backtrace.cxx     | 7 +++++--
 libbutl/backtrace.mxx     | 8 ++++----
 tests/backtrace/buildfile | 2 +-
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/libbutl/backtrace.cxx b/libbutl/backtrace.cxx
index 7a8d615..a66faa2 100644
--- a/libbutl/backtrace.cxx
+++ b/libbutl/backtrace.cxx
@@ -12,14 +12,17 @@
 // With glibc linking with -rdynamic gives (non-static) function names.
 // FreeBSD requires explicitly linking -lexecinfo.
 //
+// Note that some libc implementation on Linux (most notably, musl), don't
+// support this, at least not out of the box.
+//
 #ifndef BUILD2_BOOTSTRAP
-#  if defined(__linux__) || \
+#  if defined(__GLIBC__) || \
       defined(__APPLE__) || \
       defined(__FreeBSD__)
 #    define LIBBUTL_BACKTRACE
 #  endif
 #else
-#  if defined(__linux__) || \
+#  if defined(__GLIBC__) || \
       defined(__APPLE__)
 #    define LIBBUTL_BACKTRACE
 #  endif
diff --git a/libbutl/backtrace.mxx b/libbutl/backtrace.mxx
index 25d0dcd..38b9ce2 100644
--- a/libbutl/backtrace.mxx
+++ b/libbutl/backtrace.mxx
@@ -31,10 +31,10 @@ LIBBUTL_MODEXPORT namespace butl
   // with the binary name, address in that binary, and, if available, the
   // function name for each stack frame.
   //
-  // Currently this functionality is only available on Linux, FreeBSD, and Mac
-  // OS. On the first two platforms the address can be mapped to the function
-  // name and, if built with debug info, to source location using the
-  // addr2line(1) utility:
+  // Currently this functionality is only available on Linux (with glibc),
+  // FreeBSD, and Mac OS. On the first two platforms the address can be mapped
+  // to the function name and, if built with debug info, to source location
+  // using the addr2line(1) utility:
   //
   // $ addr2line -f -C -e <binary> <addr>
   //
diff --git a/tests/backtrace/buildfile b/tests/backtrace/buildfile
index a4120df..d6b2773 100644
--- a/tests/backtrace/buildfile
+++ b/tests/backtrace/buildfile
@@ -8,5 +8,5 @@ exe{driver}: {hxx cxx}{*} $libs testscript
 
 # Make sure backtrace() includes function names.
 #
-if ($cxx.target.class == 'linux')
+if ($cxx.target.class == 'linux' && $cc.stdlib == 'glibc')
   cxx.loptions += -rdynamic
-- 
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