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/internal/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

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

On Sunday, 22 August 2021 at 15:34:49 UTC, donallen wrote:

Does this link?

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

    writeln(1.0f);
}

That's enough to require that symbol:

$ 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.

On Sunday, 22 August 2021 at 15:53:07 UTC, jfondren wrote:

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

    writeln(1.0f);
}

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

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!