1 # Issue 52863.
2
3 # We manually create a .syso and a .a file in package a,
4 # such that the .syso file only works when linked against the .a file.
5 # Package a has #cgo LDFLAGS to make this happen.
6 #
7 # Package c imports package a, and uses cgo itself.
8 # The generation of the _cgo_import.go for package c will fail,
9 # because it won't know that it has to link against a/libb.a
10 # (because we don't gather the #cgo LDFLAGS from all transitively
11 # imported packages).
12 #
13 # The _cgo_import.go file is only needed for internal linking.
14 # When generating _cgo_import.go for package c fails, an ordinary
15 # external link should still work. But an internal link is expected
16 # to fail, because the failure to create _cgo_import.go should cause
17 # the linker to report an inability to internally link.
18
19 [short] skip
20 [!cgo] skip
21 [!exec:ar] skip
22
23 cc -c -o a/b.syso b/b.c
24 cc -c -o b/lib.o b/lib.c
25 exec ar rc a/libb.a b/lib.o
26 go build
27 ! go build -ldflags=-linkmode=internal
28 stderr 'some packages could not be built to support internal linking.*m/c|requires external linking|does not support internal cgo'
29
30 -- go.mod --
31 module m
32
33 -- a/a.go --
34 package a
35
36 // #cgo LDFLAGS: -L. -lb
37 // extern int CFn(int);
38 import "C"
39
40 func GoFn(v int) int { return int(C.CFn(C.int(v))) }
41
42 -- b/b.c --
43 extern int LibFn(int);
44 int CFn(int i) { return LibFn(i); }
45
46 -- b/lib.c --
47 int LibFn(int i) { return i; }
48
49 -- c/c.go --
50 package c
51
52 // static int D(int i) { return i; }
53 import "C"
54
55 import "m/a"
56
57 func Fn(i int) (int, int) {
58 return a.GoFn(i), int(C.D(C.int(i)))
59 }
60
61 -- main.go --
62 package main
63
64 import "m/c"
65
66 func main() {
67 println(c.Fn(0))
68 }
69
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