I'm trying to build my thing with gdc. It (now) compiles, but fails to link on this Manjaro/Arch laptop with gdc 12.2.0.

/usr/bin/ld: /tmp/ccstWTAS.o: in function `_D3std6format8internal5write__T8getWidthTAyaZQoFNaNfQlZl':
/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include/d/std/format/internal/write.d:3819: undefined reference to `_D3std9algorithm9searching__T3allSQBg6format8internal5write__T8getWidthTAyaZQoFQhZ9__lambda2Z__TQCpTQBcZQCxMFNaNfQBpZb'
/usr/bin/ld: /tmp/ccstWTAS.o: in function `_D3std6format8internal5write__T8getWidthTAaZQnFNaNfQkZl':
/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include/d/std/format/internal/write.d:3819: undefined reference to `_D3std9algorithm9searching__T3allSQBg6format8internal5write__T8getWidthTAaZQnFQgZ9__lambda2Z__TQCoTQBbZQCwMFNaNfQBoZb'
[...]

A few lines like those covering half a screen, all of it of phobos.

What conventional wisdom I've picked up somewhere along the way says to use -allinst in cases like these, and after asking around on the Discord and finding out about gdc's equivalent -fall-instantiations, it now links on a different Ubuntu machine with gdc 12.1.0. No luck still with the laptop and its 12.2.0, although the linker outputs fewer errors now.

What does -allinst even do and why does it seem to be insufficient here?

On Tuesday, 20 December 2022 at 20:01:04 UTC, Anonymouse wrote:

-allinst tells the compiler to generate code for all instantiated templates, even if it thinks that code has already been generated in a different object file.

Why would the compiler think that? Sometimes, which templates get instantiated can depend on which flags the code is compiled with. If you compile your code with one set of flags, and link it against a library compiled with a different set of flags, then the different invocations of the compiler may disagree on which templates should end up in which object files.

Hard to say without more information. Are you compiling with -preview=dip1000? If not, does adding that flag fix the error?

On Tuesday, 20 December 2022 at 20:55:08 UTC, Paul Backus wrote:

Apologies for the late reply.

I see. That makes sense. When things fail (requiring -allinst), is that a bug I should report or a fact of life to lament?

I'm not compiling with dip1000. Adding it just adds some extra lines to the top of the linker errors.

Full demangled non-dip1000 error, slightly formatted for readability;

/usr/bin/ld: ../../.dub/packages/requests-2.0.9/requests/.dub/build/[...]/librequests.a: in function `pure @safe void std.format.internal.write.formatValueImpl!(void delegate(scope const(char)[]) pure nothrow @safe, ulong, char).formatValueImpl(ref void delegate(scope const(char)[]) pure nothrow @safe, const(ulong), scope ref const(std.format.spec.FormatSpec!(char).FormatSpec))':
/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include/d/std/format/internal/write.d:171: undefined reference to `pure nothrow @nogc @trusted const(char)[] std.format.internal.write.formatValueImpl!(void delegate(scope const(char)[]) pure nothrow @safe, ulong, char).formatValueImpl(ref void delegate(scope const(char)[]) pure nothrow @safe, const(ulong), scope ref const(std.format.spec.FormatSpec!(char).FormatSpec)).__lambda5!(ulong).__lambda5(ref ulong)'

/usr/bin/ld: ../../.dub/packages/requests-2.0.9/requests/.dub/build/[...]/librequests.a: in function `pure @safe immutable(char)[] std.algorithm.searching.find!(std.algorithm.mutation.stripLeft!(immutable(char)[], char).stripLeft(immutable(char)[], char).__lambda3, immutable(char)[]).find(immutable(char)[])':
/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include/d/std/algorithm/searching.d:1858: undefined reference to `pure nothrow @nogc @safe bool std.algorithm.mutation.stripLeft!(immutable(char)[], char).stripLeft(immutable(char)[], char).__lambda3!(dchar).__lambda3(dchar)'

collect2: error: ld returned 1 exit status
Error gdc failed with exit code 1.

In this case it's even in an external dependency (requests), which compiles by itself but not when dub builds my thing with it.

I'm not sure what to do.

On Thursday, 22 December 2022 at 15:32:28 UTC, Anonymouse wrote:

If it links on Ubuntu, but not on Manjaro/Arch, then is it possible that the GDC package from Manjaro/Arch is somehow provided with a missing, misconfigured or broken Phobos library?

Maybe try to compile GDC from sources yourself?