misc/cgo/testcshared: use -pie for android-L.

Also, handle the case where 'read' returns EINVAL instead of EBADF
when the descriptor is not ready. (android 4.4.4/cyanogenmod, nexus7)

Change-Id: I56c5949d27303d44a4fd0de38951b85e20cef167
Reviewed-on: https://go-review.googlesource.com/15810Reviewed-by: Ian Lance Taylor <iant@golang.org>

misc/cgo/testcshared/main2.c

@@ -25,7 +25,7 @@ int main(void) {
     n = read(fd, buf, sizeof buf);
     if (n >= 0)
       break;
-    if (errno != EBADF) {
+    if (errno != EBADF && errno != EINVAL) {
       fprintf(stderr, "BUG: read: %s\n", strerror(errno));
       return 2;
     }

misc/cgo/testcshared/test.bash

@@ -20,7 +20,7 @@ goarch=$(go env GOARCH)
 # Directory where cgo headers and outputs will be installed.
 # The installation directory format varies depending on the platform.
 installdir=pkg/${goos}_${goarch}_testcshared_shared
-if [ "${goos}/${goarch}" == "android/arm" ] || [ "${goos}/${goarch}" == "darwin/amd64" ]; then
+if [ "${goos}/${goarch}" == "darwin/amd64" ]; then
 	installdir=pkg/${goos}_${goarch}_testcshared
 fi
 
@@ -88,9 +88,14 @@ if [ "$goos" == "linux" ]; then
     fi
 fi
 
+GOGCCFLAGS=$(go env GOGCCFLAGS)
+if [ "$goos" == "android" ]; then
+	GOGCCFLAGS="${GOGCCFLAGS} -pie"
+fi
+
 # test0: exported symbols in shared lib are accessible.
 # TODO(iant): using _shared here shouldn't really be necessary.
-$(go env CC) $(go env GOGCCFLAGS) -I ${installdir} -o testp main0.c libgo.$libext
+$(go env CC) ${GOGCCFLAGS} -I ${installdir} -o testp main0.c libgo.$libext
 binpush testp
 
 output=$(run LD_LIBRARY_PATH=. ./testp)
@@ -100,7 +105,7 @@ if [ "$output" != "PASS" ]; then
 fi
 
 # test1: shared library can be dynamically loaded and exported symbols are accessible.
-$(go env CC) $(go env GOGCCFLAGS) -o testp main1.c -ldl
+$(go env CC) ${GOGCCFLAGS} -o testp main1.c -ldl
 binpush testp
 output=$(run ./testp ./libgo.$libext)
 if [ "$output" != "PASS" ]; then
@@ -115,7 +120,7 @@ linkflags="-Wl,--no-as-needed"
 if [ "$goos" == "darwin" ]; then
 	linkflags=""
 fi
-$(go env CC) $(go env GOGCCFLAGS) -o testp2 main2.c $linkflags libgo2.$libext
+$(go env CC) ${GOGCCFLAGS} -o testp2 main2.c $linkflags libgo2.$libext
 binpush testp2
 output=$(run LD_LIBRARY_PATH=. ./testp2)
 if [ "$output" != "PASS" ]; then
@@ -125,7 +130,7 @@ fi
 
 # test3: tests main.main is exported on android.
 if [ "$goos" == "android" ]; then
-	$(go env CC) $(go env GOGCCFLAGS) -o testp3 main3.c -ldl
+	$(go env CC) ${GOGCCFLAGS} -o testp3 main3.c -ldl
 	binpush testp3
 	output=$(run ./testp ./libgo.so)
 	if [ "$output" != "PASS" ]; then