Update upstream source from tag 'upstream/3.1.0'

Update to upstream version '3.1.0'
with Debian dir 248b875f378ce1bab3315f6ed2cecdf63a4cc3cc

1 files changed, 27 insertions, 29 deletions

diff --git a/engine/SCons/Tool/yacc.py b/engine/SCons/Tool/yacc.py
index d328d20..6857574 100644
--- a/engine/SCons/Tool/yacc.py
+++ b/engine/SCons/Tool/yacc.py
@@ -31,7 +31,7 @@ selection method.
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Tool/yacc.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan"
+__revision__ = "src/engine/SCons/Tool/yacc.py e724ae812eb96f4858a132f5b8c769724744faf6 2019-07-21 00:04:47 bdeegan"
 
 import os.path
 import sys
@@ -45,6 +45,11 @@ from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
 
 YaccAction = SCons.Action.Action("$YACCCOM", "$YACCCOMSTR")
 
+if sys.platform == 'win32':
+    BINS = ['bison', 'yacc', 'win_bison']
+else:
+    BINS = ["bison", "yacc"]
+
 def _yaccEmitter(target, source, env, ysuf, hsuf):
     yaccflags = env.subst("$YACCFLAGS", target=target, source=source)
     flags = SCons.Util.CLVar(yaccflags)
@@ -100,25 +105,26 @@ def yyEmitter(target, source, env):
 
 def get_yacc_path(env, append_paths=False):
     """
-    Find the a path containing the lex or flex binaries. If a construction 
-    environment is passed in then append the path to the ENV PATH.
-    """
-    # save existing path to reset if we don't want to append any paths
-    envPath = env['ENV']['PATH']
-    bins = ['bison', 'yacc', 'win_bison']
+    Find the path to the yacc tool, searching several possible names
+
+    Only called in the Windows case, so the default_path
+    can be Windows-specific
 
-    for prog in bins:
+    :param env: current construction environment
+    :param append_paths: if set, add the path to the tool to PATH
+    :return: path to yacc tool, if found
+    """
+    for prog in BINS:
         bin_path = SCons.Tool.find_program_path(
-            env, 
-            prog, 
+            env,
+            prog,
             default_paths=CHOCO_DEFAULT_PATH + MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
         if bin_path:
-            if not append_paths:
-                env['ENV']['PATH'] = envPath
-            else:
+            if append_paths:
                 env.AppendENVPath('PATH', os.path.dirname(bin_path))
             return bin_path
-    SCons.Warnings.Warning('lex tool requested, but lex or flex binary not found in ENV PATH')
+    SCons.Warnings.Warning('yacc tool requested, but yacc or bison binary not found in ENV PATH')
+
 
 def generate(env):
     """Add Builders and construction variables for yacc to an Environment."""
@@ -140,29 +146,21 @@ def generate(env):
     cxx_file.add_emitter('.yy', yyEmitter)
 
     if sys.platform == 'win32':
-        bison = SCons.Tool.find_program_path(env, 'bison', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
-        if bison:
-            bison_bin_dir = os.path.dirname(bison)
-            env.AppendENVPath('PATH', bison_bin_dir)
-        else:
-            SCons.Warnings.Warning('yacc tool requested, but bison binary not found in ENV PATH')
+        # ignore the return, all we need is for the path to be added
+        _ = get_yacc_path(env, append_paths=True)
 
-    if sys.platform == 'win32':
-        get_yacc_path(env, append_paths=True)
-        env["YACC"] = env.Detect(['bison', 'yacc', 'win_bison'])
-    else:
-        env["YACC"] = env.Detect(["bison", "yacc"])
-    
+    env["YACC"] = env.Detect(BINS)
     env['YACCFLAGS'] = SCons.Util.CLVar('')
     env['YACCCOM']   = '$YACC $YACCFLAGS -o $TARGET $SOURCES'
     env['YACCHFILESUFFIX'] = '.h'
-
     env['YACCHXXFILESUFFIX'] = '.hpp'
-
     env['YACCVCGFILESUFFIX'] = '.vcg'
 
 def exists(env):
-    return env.Detect(['bison', 'yacc'])
+    if sys.platform == 'win32':
+        return get_yacc_path(env)
+    else:
+        return env.Detect(BINS)
 
 # Local Variables:
 # tab-width:4