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https://github.com/golang/go
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e45aebd6dd
When using -buildmode=c-archive or c-shared, and when installing packages that use cgo, and when those packages export some functions via //export comments, then for each such package, install a pkg.h header file that declares the functions. This permits C code to #include the header when calling the Go functions. This is a little awkward to use when there are multiple packages that export functions, as you have to "go install" your c-archive/c-shared object and then pull it out of the package directory. When compiling your C code you have to -I pkg/$GOOS_$GOARCH. I haven't thought of any more convenient approach. It's simpler when only the main package has exported functions. When using c-shared you currently have to use a _shared suffix in the -I option; it would be nice to fix that somehow. Change-Id: I5d8cf08914b7d3c2b194120c77791d2732ffd26e Reviewed-on: https://go-review.googlesource.com/9798 Reviewed-by: David Crawshaw <crawshaw@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
45 lines
1.3 KiB
Bash
Executable File
45 lines
1.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright 2015 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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set -e
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ccargs=
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if [ "$(go env GOOS)" == "darwin" ]; then
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ccargs="-Wl,-no_pie"
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# For darwin/arm.
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# TODO(crawshaw): Can we do better?
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ccargs="$ccargs -framework CoreFoundation -framework Foundation"
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fi
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ccargs="$ccargs -I pkg/$(go env GOOS)_$(go env GOARCH)"
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# TODO(crawshaw): Consider a go env for exec script name.
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bin=./testp
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exec_script=go_$(go env GOOS)_$(go env GOARCH)_exec
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if [ "$(which $exec_script)" != "" ]; then
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bin="$exec_script ./testp"
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fi
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rm -rf libgo.a libgo.h testp pkg
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# Installing first will create the header files we want.
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GOPATH=$(pwd) go install -buildmode=c-archive libgo
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$(go env CC) $(go env GOGCCFLAGS) $ccargs -o testp main.c pkg/$(go env GOOS)_$(go env GOARCH)/libgo.a
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$bin arg1 arg2
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rm -f libgo.a libgo.h testp
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# Test building libgo other than installing it.
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# Header files are now present.
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GOPATH=$(pwd) go build -buildmode=c-archive src/libgo/libgo.go
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$(go env CC) $(go env GOGCCFLAGS) $ccargs -o testp main.c libgo.a
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$bin arg1 arg2
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rm -f libgo.a libgo.h testp
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GOPATH=$(pwd) go build -buildmode=c-archive -o libgo.a libgo
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$(go env CC) $(go env GOGCCFLAGS) $ccargs -o testp main.c libgo.a
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$bin arg1 arg2
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rm -rf libgo.a libgo.h testp pkg
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