Missing struct fields when using CGO on macOS #35640
Description
When importing MIT Kerberos krb5.h on macOS some struct fields are not defined, while on Linux the same header causes the structs to have these fields as expected. This behavior can be replicated by trying to use github.com/zephyr-im/krb5-go library on macOS Catalina 10.15 (19A603).
What version of Go are you using (go version)?
$ go version go version go1.13.4 darwin/amd64
Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="" GOARCH="amd64" GOBIN="" GOCACHE="/Users/pedro/Library/Caches/go-build" GOENV="/Users/pedro/Library/Application Support/go/env" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPATH="/Users/pedro/go" GOPRIVATE="" GOPROXY="https://proxy.golang.org,direct" GOROOT="/usr/local/Cellar/go/1.13.4/libexec" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/usr/local/Cellar/go/1.13.4/libexec/pkg/tool/darwin_amd64" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/h8/24ggm1b922xdhz91lg7krpqh0000gn/T/go-build346701707=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
go test github.com/zephyr-im/krb5-goWhat did you expect to see?
# github.com/zephyr-im/krb5-go
../go/src/github.com/zephyr-im/krb5-go/krb5.go:241:58: princ.data undefined (type _Ctype_krb5_principal has no field or method data)
../go/src/github.com/zephyr-im/krb5-go/krb5.go:248:33: princ.realm undefined (type _Ctype_krb5_principal has no field or method realm)
../go/src/github.com/zephyr-im/krb5-go/krb5.go:269:3: unknown field 'realm' in struct literal of type _Ctype_struct_krb5_principal_data
../go/src/github.com/zephyr-im/krb5-go/krb5.go:270:3: unknown field 'data' in struct literal of type _Ctype_struct_krb5_principal_data
../go/src/github.com/zephyr-im/krb5-go/krb5.go:276:17: p.realm undefined (type *_Ctype_struct_krb5_principal_data has no field or method realm)
../go/src/github.com/zephyr-im/krb5-go/krb5.go:277:54: p.data undefined (type *_Ctype_struct_krb5_principal_data has no field or method data)
../go/src/github.com/zephyr-im/krb5-go/krb5.go:332:43: cksum.contents undefined (type *_Ctype_struct__krb5_checksum has no field or method contents)
../go/src/github.com/zephyr-im/krb5-go/krb5.go:339:3: unknown field 'contents' in struct literal of type _Ctype_struct__krb5_checksum
../go/src/github.com/zephyr-im/krb5-go/krb5.go:352:39: k.contents undefined (type *_Ctype_struct__krb5_keyblock has no field or method contents)
../go/src/github.com/zephyr-im/krb5-go/krb5.go:359:3: unknown field 'contents' in struct literal of type _Ctype_struct__krb5_keyblock
../go/src/github.com/zephyr-im/krb5-go/krb5.go:359:3: too many errors
FAIL github.com/zephyr-im/krb5-go [build failed]
FAIL
What did you see instead?
ok github.com/zephyr-im/krb5-go 0.009s