esp8266/Makefile: Add more libm files to build.

Allows MICROPY_PY_MATH_SPECIAL_FUNCTIONS to be enabled, and for ulab to be
built as a user C module.

ports/esp8266/Makefile

@@ -123,21 +123,29 @@ LIB_SRC_C = $(addprefix lib/,\
 	libm/fmodf.c \
 	libm/nearbyintf.c \
 	libm/ef_sqrt.c \
+	libm/erf_lgamma.c \
 	libm/kf_rem_pio2.c \
 	libm/kf_sin.c \
 	libm/kf_cos.c \
 	libm/kf_tan.c \
 	libm/ef_rem_pio2.c \
+	libm/sf_erf.c \
 	libm/sf_sin.c \
 	libm/sf_cos.c \
 	libm/sf_tan.c \
 	libm/sf_frexp.c \
 	libm/sf_modf.c \
 	libm/sf_ldexp.c \
+	libm/acoshf.c \
 	libm/asinfacosf.c \
+	libm/asinhf.c \
 	libm/atanf.c \
+	libm/atanhf.c \
 	libm/atan2f.c \
+	libm/log1pf.c \
 	libm/roundf.c \
+	libm/wf_lgamma.c \
+	libm/wf_tgamma.c \
 	)
 
 SHARED_SRC_C = $(addprefix shared/,\

ports/esp8266/mpconfigport.h

@@ -186,6 +186,9 @@ extern const struct _mp_obj_module_t mp_module_onewire;
     mp_obj_t pin_irq_handler[16]; \
     byte *uart0_rxbuf; \
 
+// We need an implementation of the log2 function which is not a macro
+#define MP_NEED_LOG2 (1)
+
 // We need to provide a declaration/definition of alloca()
 #include <alloca.h>