/Users/katherinewalker/drivers/driver-mongo-php/src/libbson/src/bson/bson-context.c:53:11: warning: 'syscall' is deprecated: first deprecated in macOS 10.12 - syscall(2) is unsupported; please switch to a supported interface. For SYS_kdebug_trace use kdebug_signpost(). [-Wdeprecated-declarations]
   return syscall (SYS_gettid);
          ^
/usr/include/unistd.h:733:6: note: 'syscall' has been explicitly marked deprecated here
int      syscall(int, ...);
         ^
1 warning generated.
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:37:25: warning: 'sasl_global_listmech' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   const char **mechs = sasl_global_listmech ();
                        ^
/usr/include/sasl/sasl.h:1081:27: note: 'sasl_global_listmech' has been explicitly marked deprecated here
LIBSASL_API const char ** sasl_global_listmech(void) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0,__MAC_10_11,__IPHONE_NA,__IPHONE_NA);
                          ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:218:7: warning: 'sasl_dispose' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
      sasl_dispose (&sasl->conn);
      ^
/usr/include/sasl/sasl.h:746:18: note: 'sasl_dispose' has been explicitly marked deprecated here
LIBSASL_API void sasl_dispose(sasl_conn_t **pconn) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0,__MAC_10_11,__IPHONE_NA,__IPHONE_NA);
                 ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:249:31: warning: 'sasl_global_listmech' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
         const char **mechs = sasl_global_listmech ();
                              ^
/usr/include/sasl/sasl.h:1081:27: note: 'sasl_global_listmech' has been explicitly marked deprecated here
LIBSASL_API const char ** sasl_global_listmech(void) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0,__MAC_10_11,__IPHONE_NA,__IPHONE_NA);
                          ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:278:26: warning: 'sasl_errstring' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
                         sasl_errstring (status, NULL, NULL));
                         ^
/usr/include/sasl/sasl.h:757:25: note: 'sasl_errstring' has been explicitly marked deprecated here
LIBSASL_API const char *sasl_errstring(int saslerr,
                        ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:314:13: warning: 'sasl_client_new' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   status = sasl_client_new (
            ^
/usr/include/sasl/sasl.h:947:17: note: 'sasl_client_new' has been explicitly marked deprecated here
LIBSASL_API int sasl_client_new(const char *service,
                ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:322:13: warning: 'sasl_client_start' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   status = sasl_client_start (sasl->conn,
            ^
/usr/include/sasl/sasl.h:972:17: note: 'sasl_client_start' has been explicitly marked deprecated here
LIBSASL_API int sasl_client_start(sasl_conn_t *conn,
                ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:345:13: warning: 'sasl_encode64' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   status = sasl_encode64 (raw, raw_len, (char *) outbuf, outbufmax, outbuflen);
            ^
/usr/include/sasl/saslutil.h:40:17: note: 'sasl_encode64' has been explicitly marked deprecated here
LIBSASL_API int sasl_encode64(const char *in, unsigned inlen,
                ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:391:23: warning: 'sasl_errdetail' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
                      sasl_errdetail (sasl->conn));
                      ^
/usr/include/sasl/sasl.h:770:25: note: 'sasl_errdetail' has been explicitly marked deprecated here
LIBSASL_API const char *sasl_errdetail(sasl_conn_t *conn) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0,__MAC_10_11,__IPHONE_NA,__IPHONE_NA);
                        ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:395:13: warning: 'sasl_decode64' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   status = sasl_decode64 (
            ^
/usr/include/sasl/saslutil.h:27:17: note: 'sasl_decode64' has been explicitly marked deprecated here
LIBSASL_API int sasl_decode64(const char *in, unsigned inlen,
                ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:402:13: warning: 'sasl_client_step' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   status = sasl_client_step (
            ^
/usr/include/sasl/sasl.h:993:17: note: 'sasl_client_step' has been explicitly marked deprecated here
LIBSASL_API int sasl_client_step(sasl_conn_t *conn,
                ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-cyrus.c:410:13: warning: 'sasl_encode64' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   status = sasl_encode64 (raw, rawlen, (char *) outbuf, outbufmax, outbuflen);
            ^
/usr/include/sasl/saslutil.h:40:17: note: 'sasl_encode64' has been explicitly marked deprecated here
LIBSASL_API int sasl_encode64(const char *in, unsigned inlen,
                ^
11 warnings generated.
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-init.c:106:4: warning: 'sasl_set_mutex' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   sasl_set_mutex (mongoc_cyrus_mutex_alloc,
   ^
/usr/include/sasl/sasl.h:253:18: note: 'sasl_set_mutex' has been explicitly marked deprecated here
LIBSASL_API void sasl_set_mutex(sasl_mutex_alloc_t *, sasl_mutex_lock_t *,
                 ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-init.c:111:13: warning: 'sasl_client_init' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   status = sasl_client_init (NULL);
            ^
/usr/include/sasl/sasl.h:924:17: note: 'sasl_client_init' has been explicitly marked deprecated here
LIBSASL_API int sasl_client_init(const sasl_callback_t *callbacks) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0,__MAC_10_11,__IPHONE_NA,__IPHONE_NA);
                ^
/Users/katherinewalker/drivers/driver-mongo-php/src/libmongoc/src/mongoc/mongoc-init.c:153:4: warning: 'sasl_client_done' is deprecated: first deprecated in macOS 10.11 [-Wdeprecated-declarations]
   sasl_client_done ();
   ^
/usr/include/sasl/sasl.h:741:17: note: 'sasl_client_done' has been explicitly marked deprecated here
LIBSASL_API int sasl_client_done(void) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_0,__MAC_10_11,__IPHONE_NA,__IPHONE_NA);
                ^

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

mongodb was configured with the following options:

Build configuration:
  CFLAGS                                           : -g -O2
  Extra CFLAGS                                     : -g -O0 -Wall -D_THREAD_SAFE -pthread
  Developers flags (slow)                          :  -Wmissing-format-attribute -Wduplicate-enum -Wheader-guard -Wlogical-not-parentheses -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wlogical-op-parentheses -Wbool-conversion -Wloop-analysis -Wsizeof-array-argument -Wstring-conversion -Wno-variadic-macros -Wno-sign-compare -fstack-protector -fno-exceptions -Wformat-security -Wformat-nonliteral -Winit-self -Wwrite-strings -Wenum-compare -Wempty-body -Wparentheses -Wdeclaration-after-statement -Werror -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
  Code Coverage flags (extra slow)                 :
  System mongoc                                    : no
  System libbson                                   : no
  LDFLAGS                                          :
  EXTRA_LDFLAGS                                    :
  MONGODB_SHARED_LIBADD                            : -lsasl2 -Wl,-rpath,/usr/local/opt/openssl//lib -L/usr/local/opt/openssl//lib -lcrypto -lssl -lcrypto