Done, files as: 3568250
On Sep 16, 2012, at 5:48 PM, 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
>
> On Sun, Sep 16, 2012 at 7:45 PM, Robert Wessels <robertin...@yahoo.com> wrote:
>> My command line is: msp430-gcc -mmcu=msp430g2553 main.c -o foo.elf -lm
>> Note -lm needs to be after the .c files to be picked up..
>>
>> This results in:
>>
>> /var/folders/_2/jkjmx9g52rld63ptzv1j4w4h0000gn/T//ccUsXLlr.o: In function
>> `main':
>> main.c:(.init9+0x14): undefined reference to `log'
>> collect2: ld returned 1 exit status
>>
>> If I replace log() with logf() then it links OK. If -lm is omitted in the
>> logs case a similar error is thrown by the compiler indicating the -lm was
>> picked up correctly and thus log() should have worked too.
>>
>> Robert
>>
>> On Sep 16, 2012, at 4:35 PM, Robert Wessels wrote:
>>
>>> One of the Energia users stumbled upon what seems to be a bug.
>>> The following compiles just fine.
>>>
>>> #include <msp430.h>
>>> #include <math.h>
>>>
>>> unsigned int foo = 0;
>>> int main()
>>> {
>>> double var = log(1024);
>>> var++;
>>> }
>>>
>>> This piece of code however gives:
>>>
>>> main.o: In function `main':
>>> /Users/rwessels/tmp/log_bug/main.c:9: undefined reference to `log'
>>> collect2: ld returned 1 exit status
>>> make: *** [null.elf] Error 1
>>>
>>>
>>> #include <msp430.h>
>>> #include <math.h>
>>>
>>> unsigned int foo = 0;
>>> int main()
>>> {
>>> double var = log(foo);
>>> var++;
>>> }
>>>
>>> Seems that log() does not like variables.
>>>
>>> Robert
>>>
>>
>>
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