code review 4646047: Make.ccmd: another build fix.

Make.ccmd: another build fix.
It's sad to think there are environments where compiling against a library
isn't enough information for the the linker to decide that you need that
library.
TBR=jdpoirier

[r, 2011-06-19 05:30:52]

Hello jdpoirier@gmail.com (cc: golang-dev@googlegroups.com),

I'd like you to review this change to
https://go.googlecode.com/hg/

[r, 2011-06-19 05:31:02]

*** Submitted as http://code.google.com/p/go/source/detail?r=f967b37706e1 ***

Make.ccmd: another build fix.
It's sad to think there are environments where compiling against a library
isn't enough information for the the linker to decide that you need that
library.
TBR=jdpoirier

R=jdpoirier
CC=golang-dev
http://codereview.appspot.com/4646047

[Joe Poirier, 2011-06-19 05:52:29]

On Jun 19, 2011, at Jun 19 - 12:31 AM, r@golang.org wrote:

> *** Submitted as
> http://code.google.com/p/go/source/detail?r=f967b37706e1 ***
> 
> Make.ccmd: another build fix.
> It's sad to think there are environments where compiling against a
> library
> isn't enough information for the the linker to decide that you need that
> library.
> TBR=jdpoirier
> 
> R=jdpoirier
> CC=golang-dev
> http://codereview.appspot.com/4646047
> 
> 
> http://codereview.appspot.com/4646047/

Sorry for the troubles!  

What library does -lm refer to? When I build the tool-chain using tcc it fails
because it can't find the lib file referred to by -lm. Would including math.h
have worked to resolve the missing reference to floor?

-joe

[r2, 2011-06-19 06:00:17]

On 19/06/2011, at 3:52 PM, Joseph Poirier wrote:

> On Jun 19, 2011, at Jun 19 - 12:31 AM, r@golang.org wrote:
> 
>> *** Submitted as
>> http://code.google.com/p/go/source/detail?r=f967b37706e1 ***
>> 
>> Make.ccmd: another build fix.
>> It's sad to think there are environments where compiling against a
>> library
>> isn't enough information for the the linker to decide that you need that
>> library.
>> TBR=jdpoirier
>> 
>> R=jdpoirier
>> CC=golang-dev
>> http://codereview.appspot.com/4646047
>> 
>> 
>> http://codereview.appspot.com/4646047/
> 
> Sorry for the troubles!  
> 
> What library does -lm refer to? When I build the tool-chain using tcc it fails
because it can't find the lib file referred to by -lm. Would including math.h
have worked to resolve the missing reference to floor?

-lm is the library for math.h. The reference is needed by the linker and Unix C
tools are too feebleminded to figure out that if I use math.h I need -lm.

-rob

[Joe Poirier, 2011-06-19 06:08:34]

On Jun 19, 2011, at Jun 19 - 1:00 AM, Rob 'Commander' Pike wrote:

> 
> On 19/06/2011, at 3:52 PM, Joseph Poirier wrote:
> 
>> On Jun 19, 2011, at Jun 19 - 12:31 AM, r@golang.org wrote:
>> 
>>> *** Submitted as
>>> http://code.google.com/p/go/source/detail?r=f967b37706e1 ***
>>> 
>>> Make.ccmd: another build fix.
>>> It's sad to think there are environments where compiling against a
>>> library
>>> isn't enough information for the the linker to decide that you need that
>>> library.
>>> TBR=jdpoirier
>>> 
>>> R=jdpoirier
>>> CC=golang-dev
>>> http://codereview.appspot.com/4646047
>>> 
>>> 
>>> http://codereview.appspot.com/4646047/
>> 
>> Sorry for the troubles!  
>> 
>> What library does -lm refer to? When I build the tool-chain using tcc it
fails because it can't find the lib file referred to by -lm. Would including
math.h have worked to resolve the missing reference to floor?
> 
> -lm is the library for math.h. The reference is needed by the linker and Unix
C tools are too feebleminded to figure out that if I use math.h I need -lm.
> 
> -rob

Much appreciated... 

I guess there are inconsistencies with gcc across platforms; both OSX and
Windows didn't seem to have a problem.

-joe