• donallen (20/20) Aug 22 2021 I am trying to compile a small program (I can provide the source
• donallen (2/2) Aug 22 2021 I should have mentioned that I am doing this work on Slackware
• jfondren (22/23) Aug 22 2021 Does this link?
• donallen (8/32) Aug 22 2021 I didn't even bother testing your little code snippet above

donallen <donaldcallen gmail.com> writes:

I am trying to compile a small program (I can provide the source 
code if need be). It compiles but will not link:

dmd -I=../d_library -L='-lsqlite3' load_transactions.d 
../d_library/lib.o
/usr/bin/ld: ../d_library/lib.o: in function 
`_D3std6format8internal5write__T5roundTG64aZQmFNaNbNiNfKQrmmEQCgQCfQCbQBv13RoundingClassbaZb':
/home/dca/dlang/dmd-2.097.2/linux/bin64/../../src/phobos/std/format/in
ernal/write.d:3709: undefined reference to
`_D3std4math8hardware20FloatingPointControl8roundingFNaNbNdNiNeZk'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
make: *** [makefile:10: load_transactions] Error 1

The d demangler tells me this:

dca pangloss:/tmp/nvim$ echo 
'_D3std4math8hardware20FloatingPointControl8roundingFNaNbNdNiNeZk'|
/home/dca/dlang/dmd-2.097.2/linux/bin64/ddemangle
pure nothrow  property  nogc  trusted uint 
std.math.hardware.FloatingPointControl.rounding()

I do not reference the rounding function explicitly in my 
program, so I believe the reference is within the D libraries.

Any ideas/suggestions?

Thanks --
/Don Allen

donallen <donaldcallen gmail.com> writes:

I should have mentioned that I am doing this work on Slackware 
Linux system (current). dmd was installed with the curl script.

jfondren <julian.fondren gmail.com> writes:

On Sunday, 22 August 2021 at 15:34:49 UTC, donallen wrote:
 Any ideas/suggestions?

Does this link?

```d
void main() {
     import std.stdio : writeln;

     writeln(1.0f);
}
```

That's enough to require that symbol:

```d
$ dmd havefp.d
$ nm -D havefp|grep -i 
_D3std4math8hardware20FloatingPointControl8roundingFNaNbNdNiNeZk
0000000000092a70 W 
_D3std4math8hardware20FloatingPointControl8roundingFNaNbNdN
```

If it doesn't link, my guess is that your platform isn't giving 
std.math.hardware the versions its wants, and perhaps that adding 
some -version=... flags to your command might get it to compile, 
and expose what your setup is missing.

If it does link, my only guess is that you're including an .o 
built by an earlier version of dmd which mangled that differently.

donallen <donaldcallen gmail.com> writes:

On Sunday, 22 August 2021 at 15:53:07 UTC, jfondren wrote:
 On Sunday, 22 August 2021 at 15:34:49 UTC, donallen wrote:
 Any ideas/suggestions?

 Does this link?

 ```d
 void main() {
     import std.stdio : writeln;

     writeln(1.0f);
 }
 ```

 That's enough to require that symbol:

 ```d
 $ dmd havefp.d
 $ nm -D havefp|grep -i 
 _D3std4math8hardware20FloatingPointControl8roundingFNaNbNdNiNeZk
 0000000000092a70 W 
 _D3std4math8hardware20FloatingPointControl8roundingFNaNbNdN
 ```

 If it doesn't link, my guess is that your platform isn't giving 
 std.math.hardware the versions its wants, and perhaps that 
 adding some -version=... flags to your command might get it to 
 compile, and expose what your setup is missing.

 If it does link, my only guess is that you're including an .o 
 built by an earlier version of dmd which mangled that 
 differently.

I didn't even bother testing your little code snippet above 
because your guess piqued my interest. I am resurrecting some 
work I had done with D last year and, in particular, I am using a 
library I wrote then providing some utility functions. Forcing a 
full rebuild of that library did the trick. Apparently bit-rot in 
an old .o exactly as you suggested.

Thank you!