ICE / segmentation fault (-11) regression

[fyfrey]

Hi,

the following code snippet works fine in LDC 1.15 and DMD 2.087, but fails to compile with 1.16. Successfully reduced with dustmite from a larger code base:

import std.getopt;
import std.stdio;
import std.format;
void foo() {
    GetoptResult result;
    return defaultGetoptFormatter(stderr.lockingTextWriter, format!"%s"("hi"), result.options);
}
void main(){foo();}

trace:

/dlang/ldc-1.16.0/bin/ldc2(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x2a)[0x2d7be5a]
/dlang/ldc-1.16.0/bin/ldc2(_ZN4llvm3sys17RunSignalHandlersEv+0x4c)[0x2d79ddc]
/dlang/ldc-1.16.0/bin/ldc2[0x2d79f47]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7f0dd4123890]
/dlang/ldc-1.16.0/bin/ldc2(_Z9DtoAssignR3LocP6DValueS2_ib+0xb4)[0xdd3dc4]
/dlang/ldc-1.16.0/bin/ldc2[0xe07a2e]
/dlang/ldc-1.16.0/bin/ldc2[0xe08899]
/dlang/ldc-1.16.0/bin/ldc2[0xe08899]
/dlang/ldc-1.16.0/bin/ldc2(_Z14Statement_toIRP9StatementP7IRState+0x2a)[0xe05dba]
/dlang/ldc-1.16.0/bin/ldc2(_Z17DtoDefineFunctionP15FuncDeclarationb+0xd04)[0xdca8d4]
/dlang/ldc-1.16.0/bin/ldc2(_Z19Declaration_codegenP7Dsymbol+0x31)[0xdbc231]
/dlang/ldc-1.16.0/bin/ldc2(_Z13codegenModuleP7IRStateP6Module+0xe5)[0xde0de5]
/dlang/ldc-1.16.0/bin/ldc2(_ZN3ldc13CodeGenerator4emitEP6Module+0xdc)[0xe9d75c]
/dlang/ldc-1.16.0/bin/ldc2(_Z14codegenModulesR5ArrayIP6ModuleE+0x14c)[0xe6e01c]
/dlang/ldc-1.16.0/bin/ldc2(_Z13mars_mainBodyR5ParamR5ArrayIPKcES5_+0x1507)[0xc4bd27]
/dlang/ldc-1.16.0/bin/ldc2(_Z7cppmainiPPc+0x17e6)[0xe6ca16]
/dlang/ldc-1.16.0/bin/ldc2(_D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZv+0x50)[0x2fbf240]
/dlang/ldc-1.16.0/bin/ldc2(_d_run_main+0x218)[0x2fbf058]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f0dd33cab97]
/dlang/ldc-1.16.0/bin/ldc2(_start+0x29)[0xb5ba09]
Error: Error executing /dlang/ldc-1.16.0/bin/ldc2: Segmentation fault (core dumped)

the above example code compiles without error when removing the return in foo or if format!"%s"("hi") is replaced with a string literal.

Many thanks for looking into this!

[kinke]

This is almost certainly a duplicate of #3094 and should thus already be fixed in master. Can be verified with a CI package from https://github.com/ldc-developers/ldc/releases/tag/CI.

[fyfrey]

It is fixed in a recent CI build.