On Saturday, 3 December 2022 at 18:59:58 UTC, zoujiaqing wrote:
```
dub build --compiler=ldc2 --arch=arm64-apple-macos
Starting Performing "debug" build using ldc2 for aarch64,
arm_hardfloat.
Building taggedalgebraic 0.11.22: building configuration
[library]
Building eventcore 0.9.20+commit.4.g6744ae7: building
configuration [cfrunloop]
Building server ~master: building configuration
[application]
Linking server
ld: warning: ignoring file
../../../.dub/packages/taggedalgebraic-0.11.22/taggedalgebraic/.dub/build/library-debug-posix.osx.darwin-aarch64.arm_hardfloat-ldc_v1.30.0-60F6D8BEA34F8F5E792A98EA27B02D2235262A4E0795062F91FA90871411535D/libtaggedalgebraic.a, building for macOS-x86_64 but attempting to link with file built for unknown-arm64
ld: warning: ignoring file
/opt/homebrew/Cellar/ldc/1.30.0_1/lib/libdruntime-ldc.a,
building for macOS-x86_64 but attempting to link with file
built for macOS-arm64
ld: warning: ignoring file
.dub/build/application-debug-posix.osx.darwin-aarch64.arm_hardfloat-ldc_v1.30.0-7AC1A4B8AFD7D9F59DB01E667A3DCF19DD437F41E741F5937BDCF58FAE6AA922/server.o, building for macOS-x86_64 but attempting to link with file built for unknown-arm64
ld: warning: ignoring file
../../eventcore/.dub/build/cfrunloop-debug-posix.osx.darwin-aarch64.arm_hardfloat-ldc_v1.30.0-ED6AFABD5E24BB6BCED6FD74F2DE88CF39B648360CE187983206459095D4677D/libeventcore.a, building for macOS-x86_64 but attempting to link with file built for unknown-arm64
ld: warning: ignoring file
/opt/homebrew/Cellar/ldc/1.30.0_1/lib/libphobos2-ldc.a,
building for macOS-x86_64 but attempting to link with file
built for macOS-arm64
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to
see invocation)
Error: /usr/bin/cc failed with status: 1
Error ldc2 failed with exit code 1.
```
Always look for the first error in the stacktrace. Are you using
Linux or Windows? Use Windows. Don't use Linux. There is a
missing symbol error from ld linker after entry start. In this
case the software doesn't seem to be installed correctly. Then if
you slightly further up it clearly states
building for macOS-x86_64 but attempting
to link with file built for unknown-arm64
followed by
ld: warning: ignoring file
There. You see that? Your problem seems to be that you do not
have the macOS-x86_64 software required. It tried to do its best
to build despite you not having the correct libraries before
giving up because it failed to find the first symbol from the
entry point.
