Hey, Peter, thanks for that answer. I just tested it on my system the snippet compiles just fine if using logf().
Now, sorry to derail the conversation, but I am still having issues with
the library I wrote.
Compiling the library:
[tron@HAL9000 libhd44780]$ make
Making release build...
msp430-gcc -Os -c hd44780.c -o hd44780.o -mmcu=msp430g2231
-DF_CPU=1000000UL -std=gnu99 -Wall
msp430-ar -r libhd44780-4bit.a hd44780.o
msp430-size hd44780.o
text data bss dec hex filename
572 0 2 574 23e hd44780.o
Done.
Compiling the core file:
[tron@HAL9000 hd-test]$ make
Making release build...
msp430-gcc -Os -c core.c -I../libhd44780 -mmcu=msp430g2231
-DF_CPU=1000000 -std=gnu99 -Wall
core.c:39:6: warning: return type of 'main' is not 'int' [-Wmain]
msp430-gcc -L../libhd44780 -lhd44780-4bit -mmcu=msp430g2231 core.o -o
hd-test.elf
core.o: In function `main':
core.c:(.init9+0x8): undefined reference to `hd_init'
core.c:(.init9+0x16): undefined reference to `putchar'
collect2: ld returned 1 exit status
make: *** [link] Error 1
Amusingly, if I link directly to the .o file generated when compiling
the library, it works ok:
[tron@HAL9000 hd-test]$ make debug
Making debug build...
msp430-gcc -g -c core.c -I../libhd44780 -mmcu=msp430g2231
-DF_CPU=1000000 -std=gnu99 -Wall
core.c:39:6: warning: return type of 'main' is not 'int' [-Wmain]
msp430-gcc -mmcu=msp430g2231 ../libhd44780/hd44780.o core.o -o
hd-test.elf
>>> FIRMWARE SIZE <<<
msp430-size hd-test.elf
text data bss dec hex filename
782 44 4 830 33e hd-test.elf
Is there anything I am missing?
On Sun, 2012-09-16 at 19:48 -0500, Peter Bigot wrote:
> There is no double (64-bit) support in the mspgcc toolchain, only
> float (32-bit), with double being equivalent. While most math
> libraries have both float and double entrypoints (e.g., sin() is
> simply a wrapper around sinf()), it appears log() only exists as
> logf(). Please file this as a bug on the tracker, but it won't be
> high priority since it appears to have always been this way.
>
> Since double isn't supported, it's probably best to not use it, rather
> than mislead the maintainer into thinking it's actually available.
> Use "float", and then use the corresponding functions like "logf".
>
> Peter
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