Remove -w flag from platform.txt to show warnings. Add warning to PDM header if pins not defined.

Author: nseidle

libraries/PDM/src/PDM.h

@@ -30,6 +30,16 @@ SOFTWARE.
 #define AP3_PDM_NUM_DATA_PADS 6
 #define AP3_PDM_NUM_CLOCK_PADS 6
 
+#ifndef MIC_DATA
+#warning "Mic DATA pin not defined in variant. Using default."
+#define MIC_DATA 36
+#endif
+
+#ifndef MIC_CLOCK
+#warning "Mic CLOCK pin not defined in variant. Using default."
+#define MIC_CLOCK 37
+#endif
+
 typedef struct _ap3_pdm_pad_map_elem_t
 {
     ap3_gpio_pad_t pad;

platform.txt

@@ -74,12 +74,13 @@ compiler.cmd.axf=arm-none-eabi-gcc
 compiler.cmd.axf2bin=arm-none-eabi-objcopy
 compiler.cmd.size=arm-none-eabi-size
 
-compiler.warning_flags=-w
-compiler.warning_flags.none=-w
+compiler.warning_flags=
+compiler.warning_flags.none=
 compiler.warning_flags.default=
 compiler.warning_flags.more=-Wall
 compiler.warning_flags.all=-Wall -Wextra
 
+
 compiler.flags.common_cpp_c_S={build.extra_flags} -c -g -MMD
 compiler.flags.common_cpp_c=-mcpu={build.mcu} -mthumb -mfloat-abi=hard -fdata-sections -Os
 compiler.flags.cpp={compiler.flags.common_cpp_c_S} {compiler.flags.common_cpp_c} {compiler.extra_flags.cpp} -ffunction-sections  {compiler.warning_flags} -std=gnu++11 -fno-threadsafe-statics -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions