• Dakota (8/8) Feb 26 When I use importC to build a c library, there is a lot unused
• Richard (Rikki) Andrew Cattermole (10/14) Feb 26 This removes symbols, not keeps them.
• Dakota (7/22) Feb 26 I need remove symbol, since the problem is some symbol from

Dakota <dakota gmail.com> writes:

When I use importC to build a c library, there is a lot unused 
symbol missing.

I try add `-L--gc-sections` to dmd to workaround this issue.


I also try `-L-dead_strip` on macOS, it work as expected.


I do some google, some one suggestion use with 
`-ffunction-sections`, `-f fdata-sections`,  dmd seems not 
support it.


Any tips to work this around ?

"Richard (Rikki) Andrew Cattermole" <richard cattermole.co.nz> writes:

On 27/02/2024 1:28 AM, Dakota wrote:
 When I use importC to build a c library, there is a lot unused symbol 
 missing.
 
 I try add `-L--gc-sections` to dmd to workaround this issue.

This removes symbols, not keeps them.

You want the linker flag: ``--no-gc-sections``

"Enable garbage collection of unused input sections. It is ignored on 
targets that do not support this option. The default behaviour (of not 
performing this garbage collection) can be restored by specifying 
‘--no-gc-sections’ on the command line. Note that garbage collection for 
COFF and PE format targets is supported, but the implementation is 
currently considered to be experimental."

https://sourceware.org/binutils/docs/ld/Options.html

Dakota <dakota gmail.com> writes:

On Monday, 26 February 2024 at 12:33:02 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
 On 27/02/2024 1:28 AM, Dakota wrote:
 When I use importC to build a c library, there is a lot unused 
 symbol missing.
 
 I try add `-L--gc-sections` to dmd to workaround this issue.

 This removes symbols, not keeps them.

 You want the linker flag: ``--no-gc-sections``

 "Enable garbage collection of unused input sections. It is 
 ignored on targets that do not support this option. The default 
 behaviour (of not performing this garbage collection) can be 
 restored by specifying ‘--no-gc-sections’ on the command line. 
 Note that garbage collection for COFF and PE format targets is 
 supported, but the implementation is currently considered to be 
 experimental."

 https://sourceware.org/binutils/docs/ld/Options.html

I need remove symbol, since the problem is some symbol from 
importC reference to undefined symbol(need to be implement in d, 
but they will never used).


after remove the unused symbol,  I don't need to add the 
implement all of them.