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feat(backend): default to the native backend; QBE is now opt-in

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Flip the compiler's default --backend from qbe to native.  Native has full
feature parity with QBE (the v0.11.0 cycle's 116 fixes plus the dual-backend
e2e harness brought them level), self-hosts, and gives no external codegen
dependency, source-level debugging, and a path to cross-compilation — so it
is the right default to exercise everywhere.

QBE stays fully supported via --backend qbe and remains the cold-bootstrap
root: --emit-ir still routes to QBE regardless of the default (PickTopDriver
ignores --backend for emit modes), so scripts/rolling-bootstrap.sh,
fixpoint.sh, and CI — all of which pass --emit-ir explicitly — are unaffected
by this change.  The only behaviour change is that a plain
'blaise --source X --output Y' (and a plain 'make' in runtime/) now uses the
native backend.

Flipping the default surfaced and fixed a real native gap first (the
unit-to-.o duplicate-system-defs link collision, previous commit); the full
suite is green with the TestRunner built by BOTH a QBE-built and a
native-built compiler, and all three fixpoints pass.
This commit is contained in:
Graeme Geldenhuys 2026-06-18 18:43:23 +01:00
parent 87c17ee589
commit d56bdbf84f
1 changed files with 3 additions and 3 deletions
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6
compiler/src/main/pascal/Blaise.pas
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@ -44,7 +44,7 @@ const
CompilerName = 'Blaise';
{ Build the --backend usage fragment from the registered drivers, with
the default (bkQBE) entry marked. Keeps the flag parser and the usage
the default (bkNative) entry marked. Keeps the flag parser and the usage
text from drifting out of sync with the registry when a backend is
added. }
function BackendUsageLine: string;
@ -61,7 +61,7 @@ begin
if I > 0 then
Result := Result + ' | ';
Result := Result + Names.Strings[I];
if ParseBackendName(Names.Strings[I], K) and (K = bkQBE) then
if ParseBackendName(Names.Strings[I], K) and (K = bkNative) then
Result := Result + ' (default)';
end;
finally
@ -150,7 +150,7 @@ begin
AFront.EmitIR := False;
AFront.EmitAsm := False;
AFront.DumpAST := False;
AFront.Backend := bkQBE;
AFront.Backend := bkNative; { native is the default backend; QBE is opt-in via --backend qbe }
AFront.BackendExplicit := False;
AFront.SkipDepCodegen := False;
AFront.EmitIfaceDir := '';