[sdc] linker problems when building programs with sdc

[Joseph Rushton Wakeling via Digitalmars-d-learn]

On 18/10/15 19:43, Marco Leise via Digitalmars-d-learn wrote:
> Maybe you should have started with `return 42;`? :D
> writeln is not a light-weight in terms of exercised compiler
> features. I didn't even know that it compiles yet. Last time I
> heard it was not usable.

Hahahahahahahaha :-D

Turns out even `return 42;` is a bit heavy-duty.  I do really like the way that 
sdc is obviously hooking into llvm's error reporting mechanism, though:

$ ./sdc nohello.d
; ModuleID = 'nohello.d'

define i32 @_Dmain() {
   br label %body

body:                                             ; preds = %0
   call void @_D7nohello4mainFMZv()
   ret i32 0
}

define void @_D7nohello4mainFMZv() {

body:                                             ; No predecessors!
}
nohello.d:3:4: error: d.ir.error.ErrorExpression is not supported
     return 42;
     ^~~~~~~~~~
d.exception.CompileException at libd/src/d/exception.d(15): 
d.ir.error.ErrorExpression is not supported
----------------
./sdc(llvm.c.core.__LLVMOpaqueValue* 
util.visitor.dispatchImpl!(_D1d4llvm10expression13ExpressionGen5visitMFC1d2ir10expression10ExpressionZ14__funcliteral2FC1d2ir10expression10ExpressionZPS4llvm1c4core17__LLVMOpaqueValue, 
d.llvm.expression.ExpressionGen, d.ir.expression.Expression).dispatchImpl(ref 
d.llvm.expression.ExpressionGen, d.ir.expression.Expression)+0x538) [0x138fae0]
./sdc(llvm.c.core.__LLVMOpaqueValue* 
util.visitor.dispatch!(_D1d4llvm10expression13ExpressionGen5visitMFC1d2ir10expression10ExpressionZ14__funcliteral2FC1d2ir10expression10ExpressionZPS4llvm1c4core17__LLVMOpaqueValue, 
d.llvm.expression.ExpressionGen, d.ir.expression.Expression).dispatch(ref 
d.llvm.expression.ExpressionGen, d.ir.expression.Expression)+0x1d) [0x138f5a5]
./sdc(llvm.c.core.__LLVMOpaqueValue* 
d.llvm.expression.ExpressionGen.visit(d.ir.expression.Expression)+0x55) [0x137ec55]
./sdc(llvm.c.core.__LLVMOpaqueValue* 
d.llvm.statement.StatementGen.genExpression(d.ir.expression.Expression)+0x3f) 
[0x138a627]
./sdc(void 
d.llvm.statement.StatementGen.visit(d.ast.statement.ReturnStatement!(d.ir.expression.Expression, 
d.ir.statement.Statement).ReturnStatement)+0x75) [0x138b1bd]
./sdc(void 
util.visitor.__T12dispatchImplS294util7visitor14__funcliteral6TS1d4llvm9statement12StatementGenTC1d2ir9statement9StatementZ.dispatchImpl(ref 
d.llvm.statement.StatementGen, d.ir.statement.Statement)+0x274) [0x13907ac]
./sdc(void 
util.visitor.__T8dispatchS294util7visitor14__funcliteral6TS1d4llvm9statement12StatementGenTC1d2ir9statement9StatementZ.dispatch(ref 
d.llvm.statement.StatementGen, d.ir.statement.Statement)+0x1d) [0x1390535]
./sdc(void d.llvm.statement.StatementGen.visit(d.ir.statement.Statement)+0x55) 
[0x138a4ad]
./sdc(void 
d.llvm.statement.StatementGen.visit(d.ast.statement.BlockStatement!(d.ir.statement.Statement).BlockStatement)+0xc2) 
[0x138ad3a]
./sdc(void d.llvm.local.LocalGen.genBody(d.ir.symbol.Function, 
llvm.c.core.__LLVMOpaqueValue*)+0xbb8) [0x1388730]
./sdc(bool d.llvm.local.LocalGen.maybeDefine(d.ir.symbol.Function, 
llvm.c.core.__LLVMOpaqueValue*)+0x10e) [0x1387b56]
./sdc(llvm.c.core.__LLVMOpaqueValue* 
d.llvm.local.LocalGen.define(d.ir.symbol.Function)+0x8e) [0x138798e]
./sdc(llvm.c.core.__LLVMOpaqueValue* 
d.llvm.global.GlobalGen.define(d.ir.symbol.Function)+0x15b) [0x13860cb]
./sdc(void d.llvm.global.GlobalGen.define(d.ir.symbol.Symbol)+0xd0) [0x1385db8]
./sdc(d.ir.symbol.Module 
d.llvm.codegen.CodeGenPass.visit(d.ir.symbol.Module)+0xe2) [0x132c0f2]
./sdc(void d.llvm.backend.LLVMBackend.emitObject(d.ir.symbol.Module[], 
immutable(char)[])+0xd1) [0x1328c79]
./sdc(void sdc.sdc.SDC.codeGen(immutable(char)[])+0x87) [0x12c7d17]
./sdc(void sdc.sdc.SDC.codeGen(immutable(char)[], immutable(char)[])+0x74) 
[0x12c7d94]
./sdc(_Dmain+0x59a) [0x12be462]
/opt/dmd/lib64/libphobos2.so.0.68(_D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv+0x28) 
[0x7f7c02d54ee8]
/opt/dmd/lib64/libphobos2.so.0.68(void rt.dmain2._d_run_main(int, char**, extern 
(C) int function(char[][])*).tryExec(scope void delegate())+0x2d) [0x7f7c02d54e2d]
/opt/dmd/lib64/libphobos2.so.0.68(void rt.dmain2._d_run_main(int, char**, extern 
(C) int function(char[][])*).runAll()+0x2d) [0x7f7c02d54e8d]
/opt/dmd/lib64/libphobos2.so.0.68(void rt.dmain2._d_run_main(int, char**, extern 
(C) int function(char[][])*).tryExec(scope void delegate())+0x2d) [0x7f7c02d54e2d]
/opt/dmd/lib64/libphobos2.so.0.68(_d_run_main+0x1e7) [0x7f7c02d54da7]
./sdc(main+0x20) [0x12c7708]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f7c0173fa40]