Compiler warnings...

[dl1bz]

with "make bl" I get compiler warnings with the linker:
arm-none-eabi-g++ obj_f1/DMRDMOTX.o obj_f1/IOSTM.o obj_f1/DMRTX.o obj_f1/POCSAGTX.o obj_f1/SerialArduino.o obj_f1/MMDVM_HS.o obj_f1/SerialPort.o obj_f1/DStarRX.o obj_f1/IO.o obj_f1/YSFTX.o obj_f1/DStarTX.o obj_f1/DMRIdleRX.o obj_f1/P25TX.o obj_f1/NXDNRX.o obj_f1/CalDMR.o obj_f1/Utils.o obj_f1/BitRB.o obj_f1/SerialRB.o obj_f1/IOArduino.o obj_f1/YSFRX.o obj_f1/DMRDMORX.o obj_f1/DMRSlotRX.o obj_f1/DMRRX.o obj_f1/DMRSlotType.o obj_f1/ADF7021.o obj_f1/NXDNTX.o obj_f1/CalRSSI.o obj_f1/I2CHost.o obj_f1/SerialSTM.o obj_f1/P25RX.o obj_f1/CWIdTX.o obj_f1/stm32f10x_i2c.o obj_f1/stm32f10x_rcc.o obj_f1/stm32f10x_usart.o obj_f1/misc.o obj_f1/stm32f10x_iwdg.o obj_f1/stm32f10x_gpio.o obj_f1/stm32f10x_exti.o obj_f1/system_stm32f10x.o obj_f1/startup_stm32f10x.o obj_f1/usb_serial.o obj_f1/usb_mem.o obj_f1/usb_cdcacm.o obj_f1/usb_init.o obj_f1/usb.o obj_f1/usb_reg_map.o obj_f1/usb_core.o obj_f1/usb_regs.o -Os --specs=nano.specs --specs=nosys.specs -T bootloader.ld -mcpu=cortex-m3 -march=armv7-m -mthumb -Wall -Wextra -o bin/mmdvm_f1bl.elf
/usr/lib/gcc/arm-none-eabi/5.4.1/../../../arm-none-eabi/bin/ld: warning: /usr/lib/gcc/arm-none-eabi/5.4.1/../../../arm-none-eabi/lib/armv7-m/libstdc++_nano.a(new_opv.o) uses 2-byte wchar_t yet the output is to use 4-byte wchar_t; use of wchar_t values across objects may fail
/usr/lib/gcc/arm-none-eabi/5.4.1/../../../arm-none-eabi/bin/ld: warning: /usr/lib/gcc/arm-none-eabi/5.4.1/../../../arm-none-eabi/lib/armv7-m/libstdc++_nano.a(new_op.o) uses 2-byte wchar_t yet the output is to use 4-byte wchar_t; use of wchar_t values across objects may fail
/usr/lib/gcc/arm-none-eabi/5.4.1/../../../arm-none-eabi/bin/ld: warning: /usr/lib/gcc/arm-none-eabi/5.4.1/../../../arm-none-eabi/lib/armv7-m/libstdc++_nano.a(new_handler.o) uses 2-byte wchar_t yet the output is to use 4-byte wchar_t; use of wchar_t values across objects may fail
Linking complete!

I don't know it's important - otherwise you need to check your code :)

73 Heiko, DL1BZ

[phl0]

Seen those warnings before but couldn't find a solution. So as long as its just warnings ... Ignored them.

[dl1bz]

I found the correct solution by myself :)
Look here: https://community.nxp.com/thread/389154

Important to know:
"There is a standard know 'issue' with interworking code compiled with different toolchains, which is a result of the ARM AEABI documentation allowing the size of wchar_t to be compiler defined. GCC uses a wchar_t size of 4, but some other toolchains use a size of 2."

"you can solve this problem by simply adding the linker flag "-no-wchar-size-warning" " :))

73 Heiko, DL1BZ

[phl0]

I see. Then we maybe should add this to he Makefile :)

[dl1bz]

yes that should be clear the warnings. I will check it and recompile.

[phl0]

Seems not so easy. That command line option is for ld. But in Makefile g++ is used for linking. And that doesn't know "--no-wchar-size-warning" ....

[juribeparada]

Interesting the "-no-wchar-size-warning"...are you testing on Raspbian?. At least using latest arm gcc tools on macOS (the system where I build all the official fw binaries), I haven't seen those warnings. I always thought this warning issue was an arm gcc version related.

[phl0]

Tested on my Ubuntu 18.04 x86_64 box here. The option seems to be only option for ld not for g++ ...

[juribeparada]

Are you testing on the common LDFLAGS variable?

[phl0]

jepp.

$ git diff Makefile
diff --git a/Makefile b/Makefile
index f33af1f..dde6a18 100644
--- a/Makefile
+++ b/Makefile
@@ -200,7 +200,7 @@ LDFLAGS_F7 =-T stm32f7xx_link.ld $(MCFLAGS_F7) $(INCLUDES_LIBS_F7)
 # Common flags
 CFLAGS=-Os -ffunction-sections -fdata-sections -nostdlib -DCUSTOM_NEW -DNO_EXCEPTIONS -Wno-unused-parameter -nostdlib
 CXXFLAGS=-Os -fno-exceptions -ffunction-sections -fdata-sections -nostdlib -fno-rtti -DCUSTOM_NEW -DNO_EXCEPTIONS -Wno-unused-parameter
-LDFLAGS=-Os --specs=nano.specs --specs=nosys.specs
+LDFLAGS=-Os --specs=nano.specs --specs=nosys.specs --no-wchar-size-warning
 
 # Build Rules
 .PHONY: all release_f1 release_f4 release_f7 hs bl nobl pi-f4 f446 f767 clean