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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada interacting with Windows 8.1+ GUI
Date: Fri, 26 Oct 2018 14:42:24 +0100
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Date: 2018-10-26T14:42:24+01:00
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Bill Findlay <findlaybill@blueyonder.co.uk> writes:

> On 26 Oct 2018, Simon Wright wrote
> (in article <lyin1pjca1.fsf@pushface.org>):
>
>> joakimds@kth.se writes:
>>
>> > Isn't it easy for the compiler to optimize away/remove the code that
>> > is not used?
>>
>> Not so much in a library package where some subprograms don't have to be
>> used by the overall program.
>>
>> You can compile with -ffunction-sections -fdata-sections which say each
>> subprogram/data object resp. is to have its own section. If your linker
>> supports (the equivalent of) -gc-sections. linking with it means that
>> only the used sections get linked. This is fine for (arm-eabi) embedded
>> systems &  (probably) Linux. which use GNU ld, but not on macOS. Can't
>> say for Windows.
>>
>> GNAT provides gnatelim, which analyses your code and (?) regenerates it
>> without the unused objects. No idea how well this works.
>
> Does :
>
> -Wl,-dead_strip -Wl,-dead_strip
>
> not work on macOS instead of:

I don't think you have to say it twice! - but, yes, thanks

> -Wl,--gc-sections -Wl,--as-needed

I wasn't aware of --as-needed. Seems only to eliminate whole shared
libraries, not an issue on arm-eabi!