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pimmel

Problems with msp430-g++

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So I'm trying to to create a simple little program that will interface with an si570 I2C-controlled variable oscillator. The code that I started with as a library was originally for an mbed platform [1]. Opting to keep the class structure from the mbed library, I proceeded to use the included msp430-g++ compiler shipped with Energia.

 

I knocked up a quick Makefile based upon this thread here [2]:

OBJECTS = main.o SI570.o
CC = msp430-g++
CPPFLAGS =-Os -Wall -g -mmcu=msp430g2553

all : $(OBJECTS)
  $(CC) $(CPPFLAGS) $(OBJECTS) -o main.elf

%.o : %.cpp
  $(CC) $(CPPFLAGS) -c $<


clean:
  rm -fr $(OBJECTS) main.elf

flash:
  mspdebug tilib -d USB --force-reset "prog main.elf"

size:
    msp430-size main.elf

So when I exercise make, I get the error of the linker not finding -lstdc++

 

If I add -nodefaultlibs to my CFLAGS, I got a metric crap ton of math library functions not being 

c:\pimmel\workspace\msp430i2c>make
msp430-g++ -Os -Wall -g -mmcu=msp430g2553 -nodefaultlibs -lm -lc -lgcc -c main.cpp
msp430-g++ -Os -Wall -g -mmcu=msp430g2553 -nodefaultlibs -lm -lc -lgcc -c SI570.cpp
SI570.cpp: In member function 'void SI570::get_registers()':
SI570.cpp:76:24: warning: suggest parentheses around comparison in operand of '&
' [-Wparentheses]
SI570.cpp:53:7: warning: unused variable 'i' [-Wunused-variable]
msp430-g++ -Os -Wall -g -mmcu=msp430g2553 -nodefaultlibs -lm -lc -lgcc main.o SI570.o -o main.elf
SI570.o: In function `SI570::get_registers()': SI570.cpp:(.text+0x26e): undefined reference to `__floatsisf' SI570.cpp:(.text+0x278): undefined reference to `__mulsf3' SI570.cpp:(.text+0x27c): undefined reference to `__fixunssfsi' SI570.cpp:(.text+0x280): undefined reference to `__floatunsisf' SI570.cpp:(.text+0x296): undefined reference to `__floatsisf' SI570.cpp:(.text+0x2a0): undefined reference to `__mulsf3' SI570.cpp:(.text+0x2ac): undefined reference to `__addsf3' SI570.cpp:(.text+0x2b0): undefined reference to `__fixunssfsi' SI570.cpp:(.text+0x2c0): undefined reference to `__floatunsisf' SI570.cpp:(.text+0x2ca): undefined reference to `__mulsf3' SI570.cpp:(.text+0x2fc): undefined reference to `__floatsisf' SI570.cpp:(.text+0x308): undefined reference to `__addsf3'  
(etc...)

 

I've tried differing combinations of the combination of -lm -lc -lgcc per a couple of stackoverflow posts [3], but nothing really seemed to change. Does anyone have any pointers for me on how to link this feller?

 

As an aside, I dropped the following bat file into the bin directory and when launched, it automatically adds the path for the compiler and msp430-debug. I found it convenient:

 

gccvar.bat

@echo off
rem This file is the script to set path for mspgcc tool chain.

set TL_PATH=%~dp0
set PATH=%TL_PATH%;%PATH%;%TL_PATH%\..\mspdebug
cmd /K cd %CD% 

[1] - http://mbed.org/users/soldeerridder/code/SI570/

[2] - http://forum.43oh.com/topic/835-makefile-for-mspgcc/

[3] - http://stackoverflow.com/questions/6534191/undefined-reference-to-only-some-math-h-functions

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Okay, so I tried reworking it using C-style structs and msp430-gcc instead of msp430-g++; basically I'm getting the same results if I try use floor and ceil from math.h; if I remove the --nodefaultlibs from my CFLAGS, I then get an error about floor and ceil not being defined. If I get slimy and use my own version of floor and ceil by using casting of ints, it actually compiles. So I know I'm missing something basic in the original problem. Does anyone have any insight as to what I bombed on during my linking and the missing math functions? I think I'm going to try and use nm and see if floor and ceil actually are defined somewhere....

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