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
23cc -c -o a/b.syso b/b.c
24cc -c -o b/lib.o b/lib.c
25exec ar rc a/libb.a b/lib.o
26
27go build
28! stderr 'undefined reference'
29
30! go build -ldflags=-linkmode=internal
31stderr 'some packages could not be built to support internal linking.*m/c|requires external linking|does not support internal cgo'
32
33# Test for issue #68743.
34go build -x m/d
35! stderr 'undefined reference'
36stderr 'test for internal linking'
37
38-- go.mod --
39module m
40
41-- a/a.go --
42package a
43
44// #cgo LDFLAGS: -L. -lb
45// extern int CFn(int);
46import "C"
47
48func GoFn(v int) int { return int(C.CFn(C.int(v))) }
49
50-- b/b.c --
51extern int LibFn(int);
52int CFn(int i) { return LibFn(i); }
53
54-- b/lib.c --
55int LibFn(int i) { return i; }
56
57-- c/c.go --
58package c
59
60// static int D(int i) { return i; }
61import "C"
62
63import "m/a"
64
65func Fn(i int) (int, int) {
66 return a.GoFn(i), int(C.D(C.int(i)))
67}
68
69-- d/d.go --
70// Package d is a copy of package c, to build with -x.
71package d
72
73// static int D(int i) { return i; }
74import "C"
75
76import "m/a"
77
78func Fn(i int) (int, int) {
79 return a.GoFn(i), int(C.D(C.int(i)))
80}
81
82-- main.go --
83package main
84
85import "m/c"
86
87func main() {
88 println(c.Fn(0))
89}
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