all: fix cgo compile failures on tip

Apparently the cgo typechecks get better on tip, so use C.int instead
of Go integers.

Build tip as part of the Travis build, so we can ensure that any
errors are resolved before they get released to a wider audience.

3 files changed, 5 insertions, 4 deletions

diff --git a/.travis.yml b/.travis.yml
index 2ae08be..b5c249e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,10 +19,11 @@ go:
   - 1.9.x
   - 1.10.x
   - 1.11.x
+  - master
 
 before_install:
   - |
-    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then 
+    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
       brew update
     fi
   - |
diff --git a/callback.go b/callback.go
index 2c68973..e8c492b 100644
--- a/callback.go
+++ b/callback.go
@@ -368,7 +368,7 @@ func callbackRet(typ reflect.Type) (callbackRetConverter, error) {
 func callbackError(ctx *C.sqlite3_context, err error) {
 	cstr := C.CString(err.Error())
 	defer C.free(unsafe.Pointer(cstr))
-	C.sqlite3_result_error(ctx, cstr, -1)
+	C.sqlite3_result_error(ctx, cstr, C.int(-1))
 }
 
 // Test support code. Tests are not allowed to import "C", so we can't
diff --git a/sqlite3.go b/sqlite3.go
index 942b0b5..d75e8b0 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -1674,7 +1674,7 @@ func (c *SQLiteConn) prepare(ctx context.Context, query string) (driver.Stmt, er
 	defer C.free(unsafe.Pointer(pquery))
 	var s *C.sqlite3_stmt
 	var tail *C.char
-	rv := C._sqlite3_prepare_v2_internal(c.db, pquery, -1, &s, &tail)
+	rv := C._sqlite3_prepare_v2_internal(c.db, pquery, C.int(-1), &s, &tail)
 	if rv != C.SQLITE_OK {
 		return nil, c.lastError()
 	}
@@ -1718,7 +1718,7 @@ func (c *SQLiteConn) GetFilename(schemaName string) string {
 // GetLimit returns the current value of a run-time limit.
 // See: sqlite3_limit, http://www.sqlite.org/c3ref/limit.html
 func (c *SQLiteConn) GetLimit(id int) int {
-	return int(C._sqlite3_limit(c.db, C.int(id), -1))
+	return int(C._sqlite3_limit(c.db, C.int(id), C.int(-1)))
 }
 
 // SetLimit changes the value of a run-time limits.