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| author | Matthew Dempsky <mdempsky@google.com> | 2022-11-03 11:56:43 -0700 |
|---|---|---|
| committer | Matthew Dempsky <mdempsky@google.com> | 2022-11-03 20:35:31 +0000 |
| commit | aa6240a445d2478f29add6218b19147f5bf2204f (patch) | |
| tree | 688b2e2abf4d1d82429c137e30a1a464df1e9184 /src/cmd/compile/internal/noder/noder.go | |
| parent | 48ff5c1042af780dade9f539368e8bc2259d2679 (diff) | |
| download | go-aa6240a445d2478f29add6218b19147f5bf2204f.tar.xz | |
cmd/compile: allow ineffectual //go:linkname in -lang=go1.17 and older
Prior to Go 1.18, ineffectual //go:linkname directives (i.e.,
directives referring to an undeclared name, or to a declared type or
constant) were treated as noops. In Go 1.18, we changed this into a
compiler error to mitigate accidental misuse.
However, the x/sys repo contained ineffectual //go:linkname directives
up until go.dev/cl/274573, which has caused a lot of user confusion.
It seems a bit late to worry about now, but to at least prevent
further user pain, this CL changes the error message to only apply to
modules using "go 1.18" or newer. (The x/sys repo declared "go 1.12"
at the time go.dev/cl/274573 was submitted.)
Fixes #55889.
Change-Id: Id762fff96fd13ba0f1e696929a9e276dfcba2620
Reviewed-on: https://go-review.googlesource.com/c/go/+/447755
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Diffstat (limited to 'src/cmd/compile/internal/noder/noder.go')
| -rw-r--r-- | src/cmd/compile/internal/noder/noder.go | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/noder/noder.go b/src/cmd/compile/internal/noder/noder.go index 15b1bf7b9f..d0d95451ac 100644 --- a/src/cmd/compile/internal/noder/noder.go +++ b/src/cmd/compile/internal/noder/noder.go @@ -132,7 +132,9 @@ func (p *noder) processPragmas() { } n := ir.AsNode(typecheck.Lookup(l.local).Def) if n == nil || n.Op() != ir.ONAME { - p.errorAt(l.pos, "//go:linkname must refer to declared function or variable") + if types.AllowsGoVersion(1, 18) { + p.errorAt(l.pos, "//go:linkname must refer to declared function or variable") + } continue } if n.Sym().Linkname != "" { |