CDRIVER-2374 fix C99 pedantic warning

Author: ajdavis

.evergreen/config.yml

@@ -390,7 +390,7 @@ tasks:
           type: test
           params:
             working_dir: "libbson"
-            script: "CC='${CC}' MARCH='${MARCH}' CFLAGS='-std=c99 -D_XOPEN_SOURCE=600' RELEASE=1 sh .evergreen/compile.sh"
+            script: "CC='${CC}' MARCH='${MARCH}' CFLAGS='-std=c99 -D_XOPEN_SOURCE=600 -pedantic' RELEASE=1 sh .evergreen/compile.sh"
 
     - name: release-compile-c89
       depends_on:

src/bson/bson-context-private.h

@@ -27,7 +27,8 @@ BSON_BEGIN_DECLS
 
 
 struct _bson_context_t {
-   bson_context_flags_t flags : 7;
+   /* flags are defined in bson_context_flags_t */
+   int flags : 7;
    bool pidbe_once : 1;
    uint8_t pidbe[2];
    uint8_t md5[3];

src/bson/bson-context.c

@@ -327,7 +327,7 @@ _bson_context_init (bson_context_t *context,    /* IN */
    unsigned int real_seed;
    bson_oid_t oid;
 
-   context->flags = flags;
+   context->flags = (int) flags;
    context->oid_get_host = _bson_context_get_oid_host_cached;
    context->oid_get_pid = _bson_context_get_oid_pid_cached;
    context->oid_get_seq32 = _bson_context_get_oid_seq32;

tests/test-oid.c

@@ -293,7 +293,7 @@ test_bson_oid_init_with_threads (void)
    int i;
 
    {
-      bson_context_flags_t flags = 0;
+      bson_context_flags_t flags = BSON_CONTEXT_NONE;
       bson_context_t *contexts[N_THREADS];
       bson_thread_t threads[N_THREADS];