error: verification error after IR construction

[deadprogram]

When building the https://github.com/tinygo-org/drivers/tree/master/examples/espat/espconsole example as part of the build in the smoke test, the following error is now appearing:

$ tinygo build -size short -o test.elf -target=itsybitsy-m0 ./examples/espat/espconsole/main.go
conflicting debug info for argument
  call void @llvm.dbg.value(metadata i8* %0, metadata !30275, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !30291
!30280 = !DILocalVariable(name: "s", arg: 1, scope: !30278, file: !29386, line: 171, type: !127)
!30275 = !DILocalVariable(name: "s", arg: 1, scope: !30270, file: !30271, line: 150, type: !127)
conflicting debug info for argument
  call void @llvm.dbg.value(metadata i8 %2, metadata !30276, metadata !DIExpression()), !dbg !30291
!30281 = !DILocalVariable(name: "c", arg: 2, scope: !30278, file: !29386, line: 171, type: !162)
!30276 = !DILocalVariable(name: "c", arg: 2, scope: !30270, file: !30271, line: 150, type: !162)
error: verification error after IR construction

[deadprogram]

Verified that I can reproduce same issue on my machine.

[deadprogram]

From using git bisect it would appear that commit 371c468 is what introduced this error:

$ git bisect bad 3c2639ad5520434a37488cedf3917630e7266964
Bisecting: 0 revisions left to test after this (roughly 1 step)
[371c468e8efcc6c415c4e955e69fc6072698f578] compiler: add debug info for function arguments

[aykevl]

Thanks, will have to investigate. As a workaround, you can add -no-debug.

[aykevl]

Thinking of it, perhaps we should also run the driver smoke tests as part of the compiler CI? That would catch bugs like these.

[deadprogram]

I was thinking about exactly that. Seems like a very good idea.

[aykevl]

... really weird, a function is being defined twice. And the first one is incorrect. This is probably an already existing bug that only surfaces after adding debug info.

[aykevl]

This is the cause: golang/go@ad4a58e

[aykevl]

See #352.

[deadprogram]

Verified locally:

$ tinygo build -size short -o ./build/test.elf -target=itsybitsy-m0 ./examples/espat/espconsole/main.go

   code    data     bss |   flash     ram
  23184    1420    4468 |   24604    5888

Looks good!