install-reloc: Support multi-binary installation.

[gnulib.git] / m4 / execinfo.m4

diff --git a/m4/execinfo.m4 b/m4/execinfo.m4
index fa2b845..7017974 100644 (file)
--- a/m4/execinfo.m4
+++ b/m4/execinfo.m4
@@ -1,6 +1,6 @@
 # Check for GNU-style execinfo.h.
 
-dnl Copyright 2012 Free Software Foundation, Inc.
+dnl Copyright 2012-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,13 +9,23 @@ AC_DEFUN([gl_EXECINFO_H],
 [
   AC_CHECK_HEADERS_ONCE([execinfo.h])
 
+  LIB_EXECINFO=''
+  EXECINFO_H='execinfo.h'
+
   if test $ac_cv_header_execinfo_h = yes; then
-    EXECINFO_H=''
-  else
-    EXECINFO_H='execinfo.h'
+    gl_saved_libs=$LIBS
+      AC_SEARCH_LIBS([backtrace_symbols_fd], [execinfo],
+        [test "$ac_cv_search_backtrace_symbols_fd" = "none required" ||
+         LIB_EXECINFO=$ac_cv_search_backtrace_symbols_fd])
+    LIBS=$gl_saved_libs
+    test "$ac_cv_search_backtrace_symbols_fd" = no || EXECINFO_H=''
+  fi
+
+  if test -n "$EXECINFO_H"; then
     AC_LIBOBJ([execinfo])
   fi
 
   AC_SUBST([EXECINFO_H])
+  AC_SUBST([LIB_EXECINFO])
   AM_CONDITIONAL([GL_GENERATE_EXECINFO_H], [test -n "$EXECINFO_H"])
 ])