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cmd/cgo: ignores arguments in $CC #14551

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hirochachacha opened this Issue Feb 28, 2016 · 6 comments

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hirochachacha commented Feb 28, 2016

Please answer these questions before submitting your issue. Thanks!

  1. What version of Go are you using (go version)?
    go version devel +ff27421 Sun Feb 28 11:06:40 2016 +0000 darwin/amd64
  2. What operating system and processor architecture are you using (go env)?
    GOARCH="amd64"
    GOBIN=""
    GOEXE=""
    GOHOSTARCH="amd64"
    GOHOSTOS="darwin"
    GOOS="darwin"
    GOPATH="/Users/hiro/.go"
    GORACE=""
    GOROOT="/Users/hiro/work/go"
    GOTOOLDIR="/Users/hiro/work/go/pkg/tool/darwin_amd64"
    CC="clang"
    GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -fno-common"
    CXX="clang++"
    CGO_ENABLED="1"
  3. What did you do?
    (Use play.golang.org to provide a runnable example, if possible.)

$ CC="$(xcrun --sdk iphoneos --find clang) -arch armv7 -isysroot $(xcrun --sdk iphoneos --show-sdk-path)" GOARCH=arm go tool cgo -godefs input.go

input.go

package p

/*
typedef void * ptr;
*/
import "C"

type Ptr C.ptr
  1. What did you expect to see?
    No errors.
  2. What did you see instead?
unexpected: 8-byte pointer type - *void

XCode 7.2.1 (latest)

$(xcrun --sdk iphoneos --find clang) --version

Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.3.0
Thread model: posix

Thank you.

@hirochachacha hirochachacha changed the title cmd/cgo: unexpected: 8-byte pointer type - *void on darwin/arm cmd/cgo: godefs failed with message "unexpected: 8-byte pointer type - *void" on darwin/arm Feb 28, 2016

@hirochachacha hirochachacha changed the title cmd/cgo: godefs failed with message "unexpected: 8-byte pointer type - *void" on darwin/arm cmd/cgo: -godefs failed with message "unexpected: 8-byte pointer type - *void" when darwin/arm is target Feb 28, 2016

@hirochachacha hirochachacha changed the title cmd/cgo: -godefs failed with message "unexpected: 8-byte pointer type - *void" when darwin/arm is target cmd/cgo: -godefs fail with message "unexpected: 8-byte pointer type - *void" when darwin/arm is target Feb 28, 2016

@ianlancetaylor ianlancetaylor added this to the Go1.7 milestone Feb 28, 2016

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ianlancetaylor commented Feb 28, 2016

Your C compiler seems to be generating debug info that says that the size of the type "void*" is 8 bytes. cgo is complaining because you set GOARCH=arm, so cgo expects 4 byte pointers.

Look closely at the compiler in

CC="$(xcrun --sdk iphoneos --find clang) -arch armv7 -isysroot $(xcrun --sdk iphoneos --show-sdk-path)"

Are you sure that compiler will generate 32-bit ARM code? (I don't know who XCode works myself).

You may want to run cgo with -debug-gcc to see precisely how cgo is invoking the compiler.

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hirochachacha commented Feb 29, 2016

You may want to run cgo with -debug-gcc to see precisely how cgo is invoking the compiler.

It helps me.

I guess I understand the problem.

$ CC="foo bar" go env CC

foo

Is this work as intended?

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hirochachacha commented Feb 29, 2016

CXX has same problem.

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minux commented Feb 29, 2016

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hirochachacha commented Feb 29, 2016

Yes. But is this desirable behavior?

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ianlancetaylor commented Feb 29, 2016

No, it's not. But the cgo tool does provide another way to specify compiler options, so it's not urgent.

@ianlancetaylor ianlancetaylor changed the title cmd/cgo: -godefs fail with message "unexpected: 8-byte pointer type - *void" when darwin/arm is target cmd/cgo: ignores arguments in $CC Feb 29, 2016

@ianlancetaylor ianlancetaylor modified the milestones: Unplanned, Go1.7 Feb 29, 2016

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