From 727d5f9ee1e86d3c1fae889f3d2de07f564634ed Mon Sep 17 00:00:00 2001
From: Yann Hodique <yhodique@google.com>
Date: Sun, 20 Sep 2020 16:37:42 -0700
Subject: [PATCH] guard avo-generated assembly

Regarding issue #19, fail in a more obvious way on non-gc toolchains by guarding
the generated gc assembly.
---
 asm/gen.go              | 3 +++
 bdoor/bdoor_386.s       | 2 ++
 bdoor/bdoor_amd64.s     | 2 ++
 vmcheck/vmcheck_386.s   | 2 ++
 vmcheck/vmcheck_amd64.s | 2 ++
 5 files changed, 11 insertions(+)

diff --git a/asm/gen.go b/asm/gen.go
index 89e3c24..6cf356e 100644
--- a/asm/gen.go
+++ b/asm/gen.go
@@ -21,6 +21,7 @@ import (
 	"os"
 
 	"github.com/mmcloughlin/avo/build"
+	"github.com/mmcloughlin/avo/buildtags"
 	"github.com/mmcloughlin/avo/gotypes"
 	"github.com/mmcloughlin/avo/ir"
 )
@@ -86,6 +87,8 @@ func GenAsm(f AvoMainFunc) {
 		Arch:    arch,
 	}
 
+	ctx.Constraint(buildtags.Opt("gc"))
+
 	if err := f(ctx); err != nil {
 		log.Fatal(err)
 	}
diff --git a/bdoor/bdoor_386.s b/bdoor/bdoor_386.s
index 2858136..d75892f 100644
--- a/bdoor/bdoor_386.s
+++ b/bdoor/bdoor_386.s
@@ -1,5 +1,7 @@
 // Code generated by command: go run asm.go -out bdoor_386.s -arch 386. DO NOT EDIT.
 
+// +build gc
+
 #include "textflag.h"
 
 // func bdoor_inout(ax uint32, bx uint32, cx uint32, dx uint32, si uint32, di uint32, bp uint32) (retax uint32, retbx uint32, retcx uint32, retdx uint32, retsi uint32, retdi uint32, retbp uint32)
diff --git a/bdoor/bdoor_amd64.s b/bdoor/bdoor_amd64.s
index 109aa47..f35db27 100644
--- a/bdoor/bdoor_amd64.s
+++ b/bdoor/bdoor_amd64.s
@@ -1,5 +1,7 @@
 // Code generated by command: go run asm.go -out bdoor_amd64.s -arch amd64. DO NOT EDIT.
 
+// +build gc
+
 #include "textflag.h"
 
 // func bdoor_inout(ax uint64, bx uint64, cx uint64, dx uint64, si uint64, di uint64, bp uint64) (retax uint64, retbx uint64, retcx uint64, retdx uint64, retsi uint64, retdi uint64, retbp uint64)
diff --git a/vmcheck/vmcheck_386.s b/vmcheck/vmcheck_386.s
index 88115af..ba08aad 100644
--- a/vmcheck/vmcheck_386.s
+++ b/vmcheck/vmcheck_386.s
@@ -1,5 +1,7 @@
 // Code generated by command: go run asm.go -out vmcheck_386.s -arch 386. DO NOT EDIT.
 
+// +build gc
+
 #include "textflag.h"
 
 // func cpuid_low(arg1 uint32, arg2 uint32) (eax uint32, ebx uint32, ecx uint32, edx uint32)
diff --git a/vmcheck/vmcheck_amd64.s b/vmcheck/vmcheck_amd64.s
index a4d374d..e05d81a 100644
--- a/vmcheck/vmcheck_amd64.s
+++ b/vmcheck/vmcheck_amd64.s
@@ -1,5 +1,7 @@
 // Code generated by command: go run asm.go -out vmcheck_amd64.s -arch amd64. DO NOT EDIT.
 
+// +build gc
+
 #include "textflag.h"
 
 // func cpuid_low(arg1 uint32, arg2 uint32) (eax uint32, ebx uint32, ecx uint32, edx uint32)