Add configure check CheckProg, to check for existence of a program.

3 files changed, 43 insertions, 0 deletions

diff --git a/src/engine/SCons/Conftest.py b/src/engine/SCons/Conftest.py
index e9702ff..87a3022 100644
--- a/src/engine/SCons/Conftest.py
+++ b/src/engine/SCons/Conftest.py
@@ -684,6 +684,22 @@ return 0;
 
     return ret
 
+def CheckProg(context, prog_name):
+    """
+    Configure check for a specific program.
+
+    Check whether program prog_name exists in path.  If it is found,
+    returns the path for it, otherwise returns None.
+    """
+    context.Display("Checking whether %s program exists..." % prog_name)
+    path = context.env.WhereIs(prog_name)
+    if path:
+        context.Display(path + "\n")
+    else:
+        context.Display("no\n")
+    return path
+
+
 #
 # END OF PUBLIC FUNCTIONS
 #
diff --git a/src/engine/SCons/SConf.py b/src/engine/SCons/SConf.py
index 8bce8ce..987b8ea 100644
--- a/src/engine/SCons/SConf.py
+++ b/src/engine/SCons/SConf.py
@@ -444,6 +444,7 @@ class SConfBase(object):
                  'CheckCXXHeader'     : CheckCXXHeader,
                  'CheckLib'           : CheckLib,
                  'CheckLibWithHeader' : CheckLibWithHeader,
+                 'CheckProg'          : CheckProg,
                }
         self.AddTests(default_tests)
         self.AddTests(custom_tests)
@@ -1047,6 +1048,14 @@ def CheckLibWithHeader(context, libs, header, language,
     context.did_show_result = 1
     return not res
 
+def CheckProg(context, prog_name):
+    """Simple check if a program exists in the path.  Returns the path
+    for the application, or None if not found.
+    """
+    res = SCons.Conftest.CheckProg(context, prog_name)
+    context.did_show_result = 1
+    return res
+
 # Local Variables:
 # tab-width:4
 # indent-tabs-mode:nil
diff --git a/src/engine/SCons/SConfTests.py b/src/engine/SCons/SConfTests.py
index 233ee78..57a9d04 100644
--- a/src/engine/SCons/SConfTests.py
+++ b/src/engine/SCons/SConfTests.py
@@ -611,6 +611,24 @@ int main() {
         finally:
             sconf.Finish()
 
+    def test_CheckProg(self):
+        """Test SConf.CheckProg()
+        """
+        self._resetSConfState()
+        sconf = self.SConf.SConf(self.scons_env,
+                                 conf_dir=self.test.workpath('config.tests'),
+                                 log_file=self.test.workpath('config.log'))
+
+        try:
+            r = sconf.CheckProg('sh')
+            assert r, "/bin/sh"
+            r = sconf.CheckProg('hopefully-not-a-program')
+            assert r is None
+
+        finally:
+            sconf.Finish()
+
+
     def test_Define(self):
         """Test SConf.Define()
         """