ndk-build: On Windows, check that a Cygwin-compatible GNU Make is being used.

It looks like that many NDK developers on Windows have some sort of other GNU
Make program installed in their path (e.g. because they installed another IDE
or Developer Environment), and that conflicts badly with our build scripts.

Also fix a tiny bug where the debuggable flag was lost when building
the modules.

Change-Id: I2d26131b08cf19959122abdefec9a22955d2a89c

1 files changed, 27 insertions, 0 deletions

diff --git a/ndk-build b/ndk-build
index 05bc8f8a4..c1700462b 100755
--- a/ndk-build
+++ b/ndk-build
@@ -45,4 +45,31 @@ if [ -z "$GNUMAKE" ] ; then
     GNUMAKE=make
 fi
 
+# On Windows, when running under cygwin, check that we are
+# invoking a cygwin-compatible GNU Make binary. It is unfortunately
+# common for app developers to have another non-cygwin compatible
+#
+if [ "$OSTYPE" = "cygwin" ] ; then
+    PROGDIR_MIXED=`cygpath -m $PROGDIR`
+    GNUMAKE=`cygpath -u $GNUMAKE`
+    CYGWIN_GNUMAKE=`$GNUMAKE -f $PROGDIR_MIXED/build/core/check-cygwin-make.mk 2>&1`
+    if [ $? != 0 ] ; then
+        echo "ERROR: You are using a non-Cygwin compatible Make program."
+        echo "Currently using: `cygpath -m $GNUMAKE`"
+        echo ""
+        echo "To solve the issue, follow these steps:"
+        echo ""
+        echo "1. Ensure that the Cygwin 'make' package is installed."
+        echo "   NOTE: You will need GNU Make 3.81 or later!"
+        echo ""
+        echo "2. Define the GNUMAKE environment variable to point to it, as in:"
+        echo ""
+        echo "     export GNUMAKE=/usr/bin/make"
+        echo ""
+        echo "3. Call 'ndk-build' again."
+        echo ""
+        exit 1
+    fi
+fi
+
 $GNUMAKE -f $PROGDIR/build/core/build-local.mk $@