py/py.mk: When building axtls use -Wno-all to prevent all warnings.

Building axtls gives a lot of warnings with -Wall enabled, and explicitly
disabling all of them cannot be done in a way compatible with gcc and
clang, and likely other compilers.  So just use -Wno-all to prevent all of
the extra warnings (in addition to the necessary -Wno-unused-parameter,
-Wno-uninitialized, -Wno-sign-compare and -Wno-old-style-definition).

Fixes issue #4182.

ports/esp8266/Makefile

@@ -5,7 +5,7 @@ QSTR_DEFS = qstrdefsport.h #$(BUILD)/pins_qstr.h
 
 MICROPY_PY_USSL = 1
 MICROPY_SSL_AXTLS = 1
-AXTLS_DEFS_EXTRA = -Dabort=abort_ -DRT_MAX_PLAIN_LENGTH=1024 -DRT_EXTRA=4096 -Wno-implicit-function-declaration
+AXTLS_DEFS_EXTRA = -Dabort=abort_ -DRT_MAX_PLAIN_LENGTH=1024 -DRT_EXTRA=4096
 MICROPY_FATFS = 1
 MICROPY_PY_BTREE = 1
 BTREE_DEFS_EXTRA = -DDEFPSIZE=1024 -DMINCACHE=3

py/py.mk

@@ -27,7 +27,7 @@ CFLAGS_MOD += -DMICROPY_PY_USSL=1
 ifeq ($(MICROPY_SSL_AXTLS),1)
 CFLAGS_MOD += -DMICROPY_SSL_AXTLS=1 -I$(TOP)/lib/axtls/ssl -I$(TOP)/lib/axtls/crypto -I$(TOP)/extmod/axtls-include
 AXTLS_DIR = lib/axtls
-$(BUILD)/$(AXTLS_DIR)/%.o: CFLAGS += -Wno-unused-parameter -Wno-unused-variable -Wno-unused-const-variable -Wno-unused-but-set-variable -Wno-array-bounds -Wno-uninitialized -Wno-sign-compare -Wno-old-style-definition $(AXTLS_DEFS_EXTRA)
+$(BUILD)/$(AXTLS_DIR)/%.o: CFLAGS += -Wno-all -Wno-unused-parameter -Wno-uninitialized -Wno-sign-compare -Wno-old-style-definition $(AXTLS_DEFS_EXTRA)
 SRC_MOD += $(addprefix $(AXTLS_DIR)/,\
 	ssl/asn1.c \
 	ssl/loader.c \