• Jacob Carlborg (12/12) Jan 11 2020 When compiling the runtime for iOS using `ldc-build-runtime` I get a lot...
• kinke (10/13) Jan 12 2020 Templated function instantiations aren't supposed to be weak and
• Jacob Carlborg (4/16) Jan 15 2020 Not sure I understand. Are these warnings to be expected?
• kinke (7/8) Jan 15 2020 Nope, they are definitely unexpected, although most likely not
• Jacob Carlborg (28/33) Jan 16 2020 `-linkonce-templates` gave a bunch of linker errors (missing symbols,

Jacob Carlborg <doob me.com> writes:

When compiling the runtime for iOS using `ldc-build-runtime` I get a lot 
of warnings looking like this:

ld: warning: direct access in function 'ltmp2' from file 
'objects-unittest-debug/std/algorithm/comparison.o' to global weak 
symbol 
'__D3std3uni__T23switchUniformLowerBoundSQBl10functional__T9binaryFunVAyaa6_61203c3d2062VQta1_61VQBba1_62ZQBvTAxkT
ZQDxFNaNbNiNfQskZm' 
from file 'objects-unittest-debug/std/algorithm/comparison.o' means the 
weak symbol cannot be overridden at runtime. This was likely caused by 
different translation units being compiled with different visibility 
settings.

-- 
/Jacob Carlborg

kinke <noone nowhere.com> writes:

On Saturday, 11 January 2020 at 11:06:08 UTC, Jacob Carlborg 
wrote:
 ld: warning: direct access in function 'ltmp2' from file 
 'objects-unittest-debug/std/algorithm/comparison.o' to global 
 weak symbol [...]

Templated function instantiations aren't supposed to be weak and 
overridable at runtime (!); they are emitted with `weak_odr` LLVM 
linkage, meaning that only a single definition is kept when 
linking (and that it cannot be stripped even if unreferenced). 
LDC has a `-linkonce-templates` option to switch to 
`linkonce_odr` linkage which might be interesting for testing 
(only difference to weak_odr: unreferenced symbols can be 
stripped).

Jacob Carlborg <doob me.com> writes:

On 2020-01-12 13:16, kinke wrote:
 On Saturday, 11 January 2020 at 11:06:08 UTC, Jacob Carlborg wrote:
 ld: warning: direct access in function 'ltmp2' from file 
 'objects-unittest-debug/std/algorithm/comparison.o' to global weak 
 symbol [...]

 
 Templated function instantiations aren't supposed to be weak and 
 overridable at runtime (!); they are emitted with `weak_odr` LLVM 
 linkage, meaning that only a single definition is kept when linking (and 
 that it cannot be stripped even if unreferenced). LDC has a 
 `-linkonce-templates` option to switch to `linkonce_odr` linkage which 
 might be interesting for testing (only difference to weak_odr: 
 unreferenced symbols can be stripped).

Not sure I understand. Are these warnings to be expected?

-- 
/Jacob Carlborg

kinke <noone nowhere.com> writes:

On Wednesday, 15 January 2020 at 19:57:51 UTC, Jacob Carlborg 
wrote:
 Not sure I understand. Are these warnings to be expected?

Nope, they are definitely unexpected, although most likely not 
really relevant at the moment either. You could try and see if 
recompiling either with `-linkonce-templates` or 
`-fvisibility=hidden` gets rid of them (for the latter, exclude 
the shared libs by setting the CMake var BUILD_SHARED_LIBS=OFF).

Jacob Carlborg <doob me.com> writes:

On 2020-01-15 22:22, kinke wrote:

 Nope, they are definitely unexpected, although most likely not really 
 relevant at the moment either. You could try and see if recompiling 
 either with `-linkonce-templates` or `-fvisibility=hidden` gets rid of 
 them (for the latter, exclude the shared libs by setting the CMake var 
 BUILD_SHARED_LIBS=OFF).

`-linkonce-templates` gave a bunch of linker errors (missing symbols, 
see below). `-fvisibility=hidden` worked, thanks.




__D4core10checkedint__T4adduZQgFNaNbNiNfmmKbZm", referenced from:
 
__D4core8demangle__T8DemangleTSQBcQBa15reencodeMangledFNaNbNfAxaZ12PrependHooksZQCi12dec
deNumberMFNaNfQBqZm 
in demangle.o
 
__D4core8demangle__T8DemangleTSQBcQBa7NoHooksZQBa12decodeNumberMFNaNfAxaZm 
in demangle.o
 
__D2rt8lifetime21__setArrayAllocLengthFNaNbKS4core6memory8BlkI
fo_mbxC8TypeInfomZb 
in lifetime.o
 
__D2rt8lifetime12__arrayAllocFNaNbmxC8TypeInfoxQlZS4core6memory8BlkInfo_ 
in lifetime.o
 
__D2rt8lifetime12__arrayAllocFmKS4core6memory8BlkInfo_xC8TypeInfoxQlZQBl 
in lifetime.o
 
__D2rt4util9container5array__T5ArrayTS4core2gc11gcinterface4RootZQBj__T10inse
tBackZQnMFNbNiQCdZv 
in array.o
 
__D2rt4util9container5array__T5ArrayTS4core2gc11gcinterface5RangeZQBk__T10inse
tBackZQnMFNbNiQCeZv 
in array.o

And a bunch more.

-- 
/Jacob Carlborg