unix: Don't use -Wno-error=cpp or #warning; fix strict alias warning.

For the sake of older versions of gcc (and other compilers), don't use
the #warning CPP directive, nor the -Wno-error=cpp option.

Also, fix a strict alias warning in modffi.c for older compilers, and
add a test for ffi module.

Addresses issue #847.

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/unix/ffi_float.py b/tests/unix/ffi_float.py
new file mode 100644
index 0000000000..96a5ceeca6
--- /dev/null
+++ b/tests/unix/ffi_float.py
@@ -0,0 +1,21 @@
+# test ffi float support
+
+import ffi
+
+def ffi_open(names):
+    err = None
+    for n in names:
+        try:
+            mod = ffi.open(n)
+            return mod
+        except OSError as e:
+            err = e
+    raise err
+
+libc = ffi_open(('libc.so', 'libc.so.0', 'libc.so.6'))
+
+strtof = libc.func("f", "strtof", "sp")
+print('%.6f' % strtof('1.23', None))
+
+strtod = libc.func("d", "strtod", "sp")
+print('%.6f' % strtod('1.23', None))