Build Target Compiler Option

[timmutton]

My apologies if this has been raised before, or is in the works, but I believe it would be beneficial to have the build target be an optional compiler parameter instead of being detected at run-time. This would remove the run-time checks, would remove code for the unused options (reducing file download size) and would allow inlining of the smaller functions eg print, printErr etc

[kripken]

By build target do you mean ENVIRONMENT_IS_* stuff?

It is useful in practice to run the same js in multiple environments, for me - node and spidermonkey shell, and web - without recompiling.

We could add an option to hardcode it, but it would be small in terms of code size, I think?

[timmutton]

You're right, and I'm fairly new to emscripten so it may make an
insignificant difference, but it may be useful to remive unnecessary
content for a web build, where code/download size can be an important factor
On 07/05/2013 5:37 AM, "Alon Zakai" [email protected] wrote:

By build target do you mean ENVIRONMENT_IS_* stuff?

It is useful in practice to run the same js in multiple environments, for
me - node and spidermonkey shell, and web - without recompiling.

We could add an option to hardcode it, but it would be small in terms of
code size, I think?

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[kripken]

It is just a few dozen lines of code, so i think it would be tiny in comparison to even a "hello world" program. Worth measuring though.

[timmutton]

Tested it with a hello world program using O2, the results arent as
impressive as I had hoped. For a pure web build (not works), without using
closure it saves 2,841 bytes, with simple closure it saves 1,659 bytes and
with advance closure it saves 1080 bytes.

For simplicity's sake, this does not include inlining the print and
printErr functions that are generate in the environment blocks (although
closure may have ended up doing this), although I doubt that would make any
meaningful difference

On Fri, May 10, 2013 at 9:28 AM, Alon Zakai [email protected]:

It is just a few dozen lines of code, so i think it would be tiny in
comparison to even a "hello world" program. Worth measuring though.

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[kripken]

Ok, thanks for the numbers, I guess we can close this then.