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cmd/cgo: 'a' and 'r' cannot be used as C function name #23356

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hirochachacha opened this issue Jan 6, 2018 · 3 comments
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cmd/cgo: 'a' and 'r' cannot be used as C function name #23356

hirochachacha opened this issue Jan 6, 2018 · 3 comments
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Go1.11

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@hirochachacha
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Please answer these questions before submitting your issue. Thanks!

What did you do?

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

package main

// int a(void) { return 5; };
import "C"
import "fmt"

func main() {
	fmt.Println(C.a())
}

What did you expect to see?

5

What did you see instead?

# command-line-arguments
cgo-gcc-prolog:40:7: error: called object type 'struct (anonymous struct at cgo-gcc-prolog:33:2) *' is not a function or function pointer

Does this issue reproduce with the latest release (go1.9.2)?

yes

System details

go version devel +3aeb3950a9 Mon Dec 18 20:24:12 2017 +0000 darwin/amd64
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/hiro/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/hiro/.go"
GORACE=""
GOROOT="/Users/hiro/go"
GOTMPDIR=""
GOTOOLDIR="/Users/hiro/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
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/wq/dwn8hs0x7njbzty9f68y61700000gn/T/go-build977751088=/tmp/go-build -gno-record-gcc-switches -fno-common"
GOROOT/bin/go version: go version devel +3aeb3950a9 Mon Dec 18 20:24:12 2017 +0000 darwin/amd64
GOROOT/bin/go tool compile -V: compile version devel +3aeb3950a9 Mon Dec 18 20:24:12 2017 +0000
uname -v: Darwin Kernel Version 17.3.0: Thu Nov  9 18:09:22 PST 2017; root:xnu-4570.31.3~1/RELEASE_X86_64
ProductName:	Mac OS X
ProductVersion:	10.13.2
BuildVersion:	17C88
lldb --version: lldb-900.0.64
  Swift-4.0
gdb --version: GNU gdb (GDB) 8.0.1
@gopherbot
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Change https://golang.org/cl/86495 mentions this issue: cmd/cgo: avoid name confliction for C functions

@odeke-em
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odeke-em commented Jan 7, 2018

@hirochachacha is this a regression from any of the previous Go releases? If so, please change the milestone, otherwise I'll mark it for Go1.11.

@odeke-em odeke-em added this to the Go1.11 milestone Jan 7, 2018
@hirochachacha
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The issue itself is there since day one.
However we change the macro algorithm at Go1.10. I hit on some combinations.

package main

// int a = 5;
// #define A a
import "C"
import "fmt"

func main() {
	fmt.Println(C.A)
}

The above code doesn't work on tip, but does work on 1.9.
Maybe we should call it regression. I'll let others to decide.

@odeke-em odeke-em changed the title cmd/cgo: 'a' and 'r' cannot be used as C fucntion name cmd/cgo: 'a' and 'r' cannot be used as C function name Jan 7, 2018
@golang golang locked and limited conversation to collaborators Jun 18, 2019
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@hirochachacha @ianlancetaylor @odeke-em @gopherbot