Hannes Schenk

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12 years, 1 month ago.

gcc-arm-embedded export for LPC4088

Hi,

I'm sorry to repost it as a question but I didn't get an answer in the forum.

I'm having trouble to compile mbed projects offline with the gcc-arm-embedded toolchain. I exported the blinking LED Hello World program for both the EA LPC4088 QS and the mbed LPC1768. Building the project for the LPC1768 works, for the LPC4088 I get several errors with the VFP register arguments:

"/usr/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/bin/ld: error: /mbed/TARGET_LPC4088/TOOLCHAIN_GCC_ARM/libmbed.a(pinmap.o) uses VFP register arguments, blink.elf does not"

I tried changing the -mfloat-abi parameter with no success. I also updated the latest mbed libary before exporting. The system is arch linux with the latest 4.8 gcc-arm-embedded. Any suggestions how I can get this work?

Thanks!

I have the same problem here. Grateful for any ideas!

posted by Chris Hunt 27 Feb 2014

3 Answers

Chris Hunt
12 years ago.

Got it! You need to add the "-mfpu=fpv4-sp-d16 -mfloat-abi=hard" switches to LD_FLAGS in the makefile. Boom.

Accepted Answer

That's great news, it works for me as well. Since those arguments were in the compiler flags I didn't try to move them to the linker, but that solved the problem. Thanks Chris!

posted by Hannes Schenk 28 Feb 2014
Johannes Stratmann
11 years, 11 months ago.

FP support is still confusing... I try to use emWin Lib and got VFP linker errors because lib types mismatch: mbed used abi-hard, emWin abi-soft. Now NXP has recompiled the emWin Lib to supply also abi-hard, but when exported my mbed testproject today I got a mbed lib with abi-soft. The project settings for the (LPCXpresso) project are still -mfloat-abi=hard, so compiling does not work. Is there a setting for what I get exported?

Hannes Schenk
poster
12 years ago.

Hi Chris,

unfortunately I can't provide a solution. There was no answer here on mbed and I tried searching the web for solutions, but all I could find were hints to the -mfloat-abi parameter which did not help. Let's hope there will be some fix anytime soon.