Fix args error in pyton config when ldd errors.

Author: grafikrobot

doc/src/history.adoc

@@ -1,6 +1,11 @@
 [[b2.history]]
 = History
 
+== Version 5.1.1
+
+Fix python config error when `ldd --version` fails instead of resulting in not
+detecting `glibc` for the Python configuration.
+
 == Version 5.5.0
 
 This release has a bunch of internal cleanups and bug fixes. But it also has a

src/build/version.jam

@@ -10,7 +10,7 @@ import numbers ;
 # Mirror engine JAM_VERSION
 .major = 5 ;
 .minor = 5 ;
-.patch = 0 ;
+.patch = 1 ;
 
 
 rule build ( )

src/engine/patchlevel.h

@@ -14,4 +14,4 @@ Distributed under the Boost Software License, Version 1.0.
 
 #define VERSION_MAJOR 5
 #define VERSION_MINOR 5
-#define VERSION_PATCH 0
+#define VERSION_PATCH 1

src/tools/python.jam

@@ -631,7 +631,9 @@ local rule gcc-use-libutil ( )
         {
             # Use ldd to determine the libc version, assuming
             # that GNU ldd has the same version than libc
-            local output = [ SPLIT_BY_CHARACTERS [ shell-cmd $(ldd)" --version" ] : "\r\n" ] ;
+            local ldd_version = [ shell-cmd $(ldd)" --version" ] ;
+            ldd_version ?= "" ;
+            local output = [ SPLIT_BY_CHARACTERS $(ldd_version) : "\r\n" ] ;
             debug-message found ldd '$(output[1])' ;
             glibc = [ MATCH "([0-9.]+)$" : $(output[1]) ] ;
             if $(glibc)