Cannot build library with LLDC

[avaxar]

While compiling serve-d with LLDC 1.28.0 (DMD v2.098.0, LLVM 11.1.0) on Linux Mint x86_64, when it got to compile mir-ion, it spewed these error messages:

    Building mir-ion 2.2.0: building configuration [library]
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/csv.d(234,30): Deprecation: returning `Row(&this, this.nColumns)` escapes a reference to parameter `this`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/csv.d(234,30):        perhaps remove `scope` parameter annotation so `return` applies to `ref`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9): Error: none of the overloads of `opApply` are callable using argument types `(int delegate(const(char[])[] symbolTable, IonDescribedValue value) pure nothrow @nogc @safe) const`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(37,19):        Candidates are: `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(48,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(53,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(58,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(63,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @system dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9):        ... (19 more, -v to show) ...
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/package.d(981,32): Error: template instance `mir.ion.stream.IonValueStream.serialize!(IonSerializer!(32768u, ["data"], false))` error instantiating
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/ion.d(444,19):        instantiated from here: `serializeValue!(IonSerializer!(32768u, ["data"], false), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/benchmark.d(68,25):        instantiated from here: `serializeIon!(ScopedBuffer!(ubyte, 4096LU), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9): Error: none of the overloads of `opApply` are callable using argument types `(int delegate(const(char[])[] symbolTable, IonDescribedValue value) pure nothrow @nogc @safe) const`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(37,19):        Candidates are: `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(48,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(53,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(58,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(63,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @system dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9):        ... (19 more, -v to show) ...
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/package.d(981,32): Error: template instance `mir.ion.stream.IonValueStream.serialize!(JsonSerializer!("", ScopedBuffer!(char, 4096LU)))` error instantiating
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/json.d(584,23):        instantiated from here: `serializeValue!(JsonSerializer!("", ScopedBuffer!(char, 4096LU)), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/benchmark.d(73,26):        instantiated from here: `serializeJsonPretty!(ScopedBuffer!(char, 4096LU), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9): Error: none of the overloads of `opApply` are callable using argument types `(int delegate(const(char[])[] symbolTable, IonDescribedValue value) pure nothrow @nogc @safe) const`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(37,19):        Candidates are: `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(48,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(53,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(58,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(63,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @system dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9):        ... (19 more, -v to show) ...
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/package.d(981,32): Error: template instance `mir.ion.stream.IonValueStream.serialize!(MsgpackSerializer!(ScopedBuffer!(ubyte, 4096LU)))` error instantiating
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/msgpack.d(634,19):        instantiated from here: `serializeValue!(MsgpackSerializer!(ScopedBuffer!(ubyte, 4096LU)), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/benchmark.d(78,29):        instantiated from here: `serializeMsgpack!(ScopedBuffer!(ubyte, 4096LU), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9): Error: none of the overloads of `opApply` are callable using argument types `(int delegate(const(char[])[] symbolTable, IonDescribedValue value) pure nothrow @safe) const`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(37,19):        Candidates are: `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(48,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(53,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(58,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(63,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @system dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9):        ... (19 more, -v to show) ...
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/package.d(981,32): Error: template instance `mir.ion.stream.IonValueStream.serialize!(JsonSerializer!("", Appender!(char[])))` error instantiating
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/json.d(584,23):        instantiated from here: `serializeValue!(JsonSerializer!("", Appender!(char[])), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/json.d(596,28):        instantiated from here: `serializeJsonPretty!(Appender!(char[]), const(IonValueStream))`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/conv.d(229,31):        instantiated from here: `serializeJsonPretty!(IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/json.d(597,53): Error: forward reference to inferred return type of function call `function () @trusted => cast(string)app.data()`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/conv.d(229,31): Error: `pure` function `mir.ion.conv.ion2json` cannot call impure function `mir.ser.json.serializeJsonPretty!"".serializeJsonPretty!(IonValueStream).serializeJsonPretty`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9): Error: none of the overloads of `opApply` are callable using argument types `(int delegate(const(char[])[] symbolTable, IonDescribedValue value) pure nothrow @safe) const`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(37,19):        Candidates are: `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(48,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(53,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(58,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(63,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @system dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9):        ... (19 more, -v to show) ...
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/package.d(981,32): Error: template instance `mir.ion.stream.IonValueStream.serialize!(JsonSerializer!("\x09", Appender!(char[])))` error instantiating
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/json.d(584,23):        instantiated from here: `serializeValue!(JsonSerializer!("\x09", Appender!(char[])), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/json.d(596,28):        instantiated from here: `serializeJsonPretty!(Appender!(char[]), const(IonValueStream))`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/conv.d(256,31):        instantiated from here: `serializeJsonPretty!(IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/json.d(597,53): Error: forward reference to inferred return type of function call `function () @trusted => cast(string)app.data()`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/conv.d(256,31): Error: `pure` function `mir.ion.conv.ion2jsonPretty` cannot call impure function `mir.ser.json.serializeJsonPretty!().serializeJsonPretty!(IonValueStream).serializeJsonPretty`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9): Error: none of the overloads of `opApply` are callable using argument types `(int delegate(const(char[])[] symbolTable, IonDescribedValue value) pure nothrow @safe) const`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(37,19):        Candidates are: `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(48,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(53,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(58,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(63,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @system dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9):        ... (19 more, -v to show) ...
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/package.d(981,32): Error: template instance `mir.ion.stream.IonValueStream.serialize!(TextSerializer!("", Appender!(char[])))` error instantiating
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/text.d(725,23):        instantiated from here: `serializeValue!(TextSerializer!("", Appender!(char[])), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/text.d(682,28):        instantiated from here: `serializeTextPretty!(Appender!(char[]), IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/text.d(512,34):        instantiated from here: `serializeTextPretty!("", IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/conv.d(389,31):        instantiated from here: `serializeText!(IonValueStream)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/text.d(683,49): Error: forward reference to inferred return type of function call `function () @trusted => cast(string)app.data()`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/conv.d(389,31): Error: `pure` function `mir.ion.conv.ion2text` cannot call impure function `mir.ser.text.serializeText!(IonValueStream).serializeText`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9): Error: none of the overloads of `opApply` are callable using argument types `(int delegate(const(char[])[] symbolTable, IonDescribedValue value) pure nothrow @safe) const`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(37,19):        Candidates are: `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(48,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @nogc @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(53,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(58,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) @safe dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(63,19):                        `mir.ion.stream.IonValueStream.opApply(scope int delegate(scope const(char[])[] symbolTable, scope IonDescribedValue value) pure @nogc @system dg)`
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ion/stream.d(321,9):        ... (19 more, -v to show) ...
../../.dub/packages/mir-ion/2.2.0/mir-ion/source/mir/ser/package.d(981,32): Error: template instance `mir.ion.stream.IonValueStream.serialize!(TextSerializer!("\x09", Appender!(char[])))` error instantiating
Error ldc2 failed with exit code 1.

Oddly though, compiling with DMD v2.104.0 seems to work. Perhaps the library's codebase should remain compatible with older versions of the DMD frontend?

[9il]

The recent compilers require code changes that aren't well compatible with older compilers because of Mir Ion code reflection complexity. The future policy is expected to be more conservative until new compiler deprecations come.