NetBSD: Add PYTHON env variable for build.sh to specify python exec name

This allows to overload the default 'python' executable name and is used
on NetBSD with pkgsrc, where python is either python2.7 or python3.x.

diff --git a/build.sh b/build.sh
index 67bc2c5..9eff3b0 100755 (executable)
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+PYTHON=${PYTHON:-python}
+
 usage()
 {
     echo "Usage: $0 [BuildArch] [BuildType] [clean] [verbose] [coverage] [cross] [clangx.y] [ninja] [configureonly] [skipconfigure] [skipnative] [skipmscorlib] [skiptests]"
@@ -65,7 +67,7 @@ build_coreclr()
 {
     if [[ $__SkipCoreCLR == 0 || $__ConfigureOnly == 1 ]]; then
         echo "Laying out dynamically generated files consumed by the build system "
-        python "$__ProjectRoot/src/scripts/genXplatEventing.py" --man "$__ProjectRoot/src/vm/ClrEtwAll.man" --exc "$__ProjectRoot/src/vm/ClrEtwAllMeta.lst" --inc "$__GeneratedIntermediatesDir/inc" --dummy "$__GeneratedIntermediatesDir/inc/etmdummy.h" --testdir "$__GeneratedIntermediatesDir/eventprovider_tests"
+        $PYTHON "$__ProjectRoot/src/scripts/genXplatEventing.py" --man "$__ProjectRoot/src/vm/ClrEtwAll.man" --exc "$__ProjectRoot/src/vm/ClrEtwAllMeta.lst" --inc "$__GeneratedIntermediatesDir/inc" --dummy "$__GeneratedIntermediatesDir/inc/etmdummy.h" --testdir "$__GeneratedIntermediatesDir/eventprovider_tests"
         if  [[ $? != 0 ]]; then
             exit
         fi
@@ -73,7 +75,7 @@ build_coreclr()
         #determine the logging system
         case $__BuildOS in
             Linux)
-                python "$__ProjectRoot/src/scripts/genXplatLttng.py" --man "$__ProjectRoot/src/vm/ClrEtwAll.man" --intermediate "$__GeneratedIntermediatesDir/"
+                $PYTHON "$__ProjectRoot/src/scripts/genXplatLttng.py" --man "$__ProjectRoot/src/vm/ClrEtwAll.man" --intermediate "$__GeneratedIntermediatesDir/"
                 if  [[ $? != 0 ]]; then
                     exit
                 fi
@@ -84,7 +86,7 @@ build_coreclr()
     fi
 
     export __GeneratedIntermediatesDirPresent="$__IntermediatesDir/Generated" #do not use this variable, it is used below to support incremental build
-    python -c "import sys;sys.path.insert(0,\"$__ProjectRoot/src/scripts\"); from Utilities import *;UpdateDirectory(\"$__GeneratedIntermediatesDirPresent\",\"$__GeneratedIntermediatesDir\")"
+    $PYTHON -c "import sys;sys.path.insert(0,\"$__ProjectRoot/src/scripts\"); from Utilities import *;UpdateDirectory(\"$__GeneratedIntermediatesDirPresent\",\"$__GeneratedIntermediatesDir\")"
     if  [[ $? != 0 ]]; then
         exit
     fi