runtime/cgo: macro expansion producing 'defined' has undefined behavior #38876

Sr0121 · 2020-05-05T15:16:18Z

What version of Go are you using (`go version`)?

$ go version
go version go1.14.2 darwin/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (`go env`)?

OS: macOS Catalina 10.15.4

go env Output

$ go env
GO111MODULE=""

GOARCH="amd64"

GOBIN=""

GOCACHE="/Users/sr/Library/Caches/go-build"

GOENV="/Users/sr/Library/Application Support/go/env"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="darwin"

GOINSECURE=""

GONOPROXY=""

GONOSUMDB=""

GOOS="darwin"

GOPATH="/Users/sr/go"

GOPRIVATE=""

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/usr/local/go"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/usr/local/go/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/7t/mh0c8z9x6rn72vfl7jxrqh4r0000gn/T/go-build284435102=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Try to run this code:

package main

import (
	"fmt"
	"log"
	"net/http"
)

func main() {
	http.HandleFunc("/", indexHandler)
	log.Fatal(http.ListenAndServe(":9999", nil))
}

// handler echoes r.URL.Path
func indexHandler(w http.ResponseWriter, req *http.Request) {
	fmt.Fprintf(w, "URL.Path = %q\n", req.URL.Path)
}

What did you expect to see?

Expect the program to run.

What did you see instead?

# runtime/cgo
In file included from gcc_darwin_amd64.c:6:
/usr/local/include/pthread.h:331:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:2: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
/usr/local/include/pthread.h:331:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:34: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
/usr/local/include/pthread.h:332:5: error: declaration of built-in function 'pthread_create' requires inclusion of the header <pthread.h> [-Werror,-Wbuiltin-requires-header]
/usr/local/include/pthread.h:540:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:2: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
/usr/local/include/pthread.h:540:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:34: note: expanded from macro     ####'_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'

The text was updated successfully, but these errors were encountered:

ALTree · 2020-05-05T21:06:04Z

This is a dup of #38552 but you provided a reproducer so let's keep this one and I'll close the other thread.

ianlancetaylor · 2020-05-05T22:38:16Z

What do you see if you create a file foo.c containing

#include <string.h>
#include <pthread.h>

and then run

cc -c -Wall -Werror foo.c

?

Sr0121 · 2020-05-05T23:28:32Z

What do you see if you create a file foo.c containing
#include <string.h>
#include <pthread.h>
and then run
cc -c -Wall -Werror foo.c
?

@ianlancetaylor

In file included from foo.c:2:
/usr/local/include/pthread.h:331:6: error: macro expansion producing 'defined'
      has undefined behavior [-Werror,-Wexpansion-to-defined]
#if !_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT
     ^
/usr/local/include/pthread.h:200:2: note: expanded from macro
      '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
        defined(SWIFT_CLASS_EXTRA) && (!defined(SWIFT_SDK_OVERLAY_PTHREA...
        ^
/usr/local/include/pthread.h:331:6: error: macro expansion producing 'defined'
      has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:34: note: expanded from macro
      '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
        defined(SWIFT_CLASS_EXTRA) && (!defined(SWIFT_SDK_OVERLAY_PTHREA...
                                        ^
/usr/local/include/pthread.h:332:5: error: declaration of built-in function
      'pthread_create' requires inclusion of the header <pthread.h>
      [-Werror,-Wbuiltin-requires-header]
int pthread_create(pthread_t _Nullable * _Nonnull __restrict,
    ^
/usr/local/include/pthread.h:540:6: error: macro expansion producing 'defined'
      has undefined behavior [-Werror,-Wexpansion-to-defined]
#if !_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT
     ^
/usr/local/include/pthread.h:200:2: note: expanded from macro
      '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
        defined(SWIFT_CLASS_EXTRA) && (!defined(SWIFT_SDK_OVERLAY_PTHREA...
        ^
/usr/local/include/pthread.h:540:6: error: macro expansion producing 'defined'
      has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:34: note: expanded from macro
      '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
        defined(SWIFT_CLASS_EXTRA) && (!defined(SWIFT_SDK_OVERLAY_PTHREA...
                                        ^

ianlancetaylor · 2020-05-06T00:01:04Z

Thanks. Seems to me that your C compiler is broken, or at least that it doesn't agree with your library.

Is there some option that we can pass to the compiler to disable this pointless error? Does it work if you run

cc -Wall -Werror -Wno-expansion-to-defined foo.c

?

Sr0121 · 2020-05-06T00:52:13Z

Thanks. Seems to me that your C compiler is broken, or at least that it doesn't agree with your library.

Is there some option that we can pass to the compiler to disable this pointless error? Does it work if you run
cc -Wall -Werror -Wno-expansion-to-defined foo.c
?

A new error has occurred.

In file included from foo.c:2:
/usr/local/include/pthread.h:332:5: error: declaration of built-in function
      'pthread_create' requires inclusion of the header <pthread.h>
      [-Werror,-Wbuiltin-requires-header]
int pthread_create(pthread_t _Nullable * _Nonnull __restrict,
    ^
1 error generated.

ianlancetaylor · 2020-05-06T03:19:14Z

I really don't understand that one.

That said, why it is including from /usr/local/include? Is that where standard library header files live on Darwin? Or is there another <pthread.h> that it should be using instead? What happens if you temporarily remove /usr/local/include/pthread.h and compile foo.c?

victorneuret · 2020-05-06T10:54:55Z

Hi!
I already encountered an error like that one.
I've had to add CGO_CPPFLAGS=-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wbuiltin-requires-header to my env to make it work.
I think that it's just removing the compilation flags.

My program is the same than yours and I was able to make it work using this.
I'm using MacOs Catalina 10.15.4

Sr0121 · 2020-05-06T13:44:03Z

Thank you all for your help. I finally found out that my Xcode command line tools can not work as expectation. What I did is to run these lines in Terminal.

sudo rm -rf /Library/Developer/CommandLineTools
xcode-select --install

stephanGarland · 2020-05-11T15:51:31Z

FWIW I had the same issue (different codebase, tried using OP's code and reproduced issue), and reinstalling xcode did NOT fix it.

Installing gcc with brew and then explicitly setting CC and CXX to the symlinked gcc binaries did fix it.

erikterwiel · 2020-05-19T05:29:28Z

Hi!
I already encountered an error like that one.
I've had to add CGO_CPPFLAGS=-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wbuiltin-requires-header to my env to make it work.
I think that it's just removing the compilation flags.

My program is the same than yours and I was able to make it work using this.
I'm using MacOs Catalina 10.15.4

This works for me except -Wbuiltin-requires-header -> -Wno-builtin-requires-header.
Then, what add to env is: CGO_CPPFLAGS=-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wno-builtin-requires-header

codeBehindMe · 2020-05-27T05:49:46Z

So i noticed this issue on MacOs Catalina 10.15.4 as well, out of the blue. I tried the solution that @Sr0121 suggested, didn't work, I also tried the reinstalling gcc as per @stephanGarland's comment, to no avail.

Finally I upgraded 10.15.5 and did the above as well, still didn't change anything. I had to add compiler flags as per @victorneuret .

Kind of annoying how this came out of the blue.
I also tried different go version as well.

sharpSteff · 2020-07-12T18:39:23Z

@erikterwiel That worked for me as well!
Thank you!

sharpSteff · 2020-07-12T19:36:14Z

found out.. I recently symlinked gcc headers into usr/local/include to get some other project running.
After removing these symlinks from usr/local/include, everything works fine again

codeBehindMe · 2020-07-12T21:40:41Z

Yea I think I did something similar to get it working.

kangkang59812 · 2020-07-28T06:39:19Z

Hi!
I already encountered an error like that one.
I've had to add CGO_CPPFLAGS=-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wbuiltin-requires-header to my env to make it work.
I think that it's just removing the compilation flags.
My program is the same than yours and I was able to make it work using this.
I'm using MacOs Catalina 10.15.4

This works for me except -Wbuiltin-requires-header -> -Wno-builtin-requires-header.
Then, what add to env is: CGO_CPPFLAGS=-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wno-builtin-requires-header

where to add and how?

kangkang59812 · 2020-07-28T06:40:43Z

symlinked

how to do it?

emil-j-olsson · 2020-08-05T17:53:19Z

@kangkang59812
export CGO_CPPFLAGS="-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wno-builtin-requires-header"

Then check your environment via go env.

vietvudanh · 2020-08-16T11:07:46Z

One more problem is that I got permission denied after using the CGO_CPPFLAGS flag:

go build runtime/cgo: copying /Users/hrbc/Library/Caches/go-build/63/63a132c80210b5c7b4f4ed9a902aaec712c42b15e23aa2c1b1778e2f85165d04-d: open /usr/local/go/pkg/darwin_amd64/runtime/cgo.a: permission denied

I need to grant permission to /usr/local/go for it to work. I think this should be handled by the installer?

qxysg1273 · 2021-05-04T07:48:10Z

Hi!
I already encountered an error like that one.
I've had to add CGO_CPPFLAGS=-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wbuiltin-requires-header to my env to make it work.
I think that it's just removing the compilation flags.

My program is the same than yours and I was able to make it work using this.
I'm using MacOs Catalina 10.15.4

Thanks, this works fom me!

chengengliu · 2021-06-16T06:18:52Z

Hi!
I have tried above mentioned methods, including adding -Wno-error .... and reinstalling command line tools. After that, running cc -c -Wall -Werror foo.c does not have any errors but I still get error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]. go env output:
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/Apple/Library/Caches/go-build"
GOENV="/Users/Apple/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/Apple/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/Apple/go"</br>
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.16.5"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS="-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wno-builtin-requires-header"
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 </br>-fdebug-prefix-map=/var/folders/7s/jyvyj40j623gz34m5f1pksxr0000gn/T/go-build3850003340=/tmp/go-build -gno-record-gcc-switches -fno-common".
MacOS11.4.

The error:

# runtime/cgo
In file included from gcc_darwin_amd64.c:6:
/usr/local/include/pthread.h:328:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:197:2: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'

chengengliu · 2021-06-16T06:36:09Z

Hi!
I have tried above mentioned methods, including adding -Wno-error .... and reinstalling command line tools. After that, running cc -c -Wall -Werror foo.c does not have any errors but I still get error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]. go env output:
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/Apple/Library/Caches/go-build"
GOENV="/Users/Apple/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/Apple/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/Apple/go"</br>
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.16.5"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS="-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wno-builtin-requires-header"
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 </br>-fdebug-prefix-map=/var/folders/7s/jyvyj40j623gz34m5f1pksxr0000gn/T/go-build3850003340=/tmp/go-build -gno-record-gcc-switches -fno-common".
MacOS11.4.

Now the still got the error:

# runtime/cgo
In file included from gcc_darwin_amd64.c:6:
/usr/local/include/pthread.h:328:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:197:2: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'

Problems solved. I reinstalled Xcode and reboot the machine. Now it works like a charm. I guess there must be something I played with gcc that broke it.

yamasite · 2021-10-02T02:58:31Z

@kangkang59812 export CGO_CPPFLAGS="-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wno-builtin-requires-header"

Then check your environment via go env.

I met the same issue when using gvm to install go1.16 in Big Sur. Your solution totally works!

mac@macdeMac-mini ~ % gvm install go1.16

Downloading Go source...

Installing go1.16...
 * Compiling...
ERROR: Failed to compile. Check the logs at /Users/mac/.gvm/logs/go-go1.16-compile.log
ERROR: Failed to use installed version
mac@macdeMac-mini ~ %
mac@macdeMac-mini ~ % cat /Users/mac/.gvm/logs/go-go1.16-compile.log
Building Go cmd/dist using /usr/local/go. (go1.17.1 darwin/amd64)
Building Go toolchain1 using /usr/local/go.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
Building Go toolchain3 using go_bootstrap and Go toolchain2.
Building packages and commands for darwin/amd64.
# runtime/cgo
In file included from gcc_darwin_amd64.c:6:
/usr/local/include/pthread.h:331:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:2: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
/usr/local/include/pthread.h:331:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:34: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
/usr/local/include/pthread.h:540:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:2: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
/usr/local/include/pthread.h:540:6: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
/usr/local/include/pthread.h:200:34: note: expanded from macro '_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT'
go tool dist: FAILED: /Users/mac/.gvm/gos/go1.16/pkg/tool/darwin_amd64/go_bootstrap install -gcflags=all= -ldflags=all= std cmd: exit status 2
mac@macdeMac-mini ~ % export CGO_CPPFLAGS="-Wno-error -Wno-nullability-completeness -Wno-expansion-to-defined -Wno-builtin-requires-header"
mac@macdeMac-mini ~ % gvm install go1.16

Installing go1.16...
 * Compiling...
go1.16 successfully installed!

chqrlie · 2022-05-08T20:02:33Z

This #define is even more bogus! The definition in <pthread.h> is this:

#define _PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT \
	defined(SWIFT_CLASS_EXTRA) && (!defined(SWIFT_SDK_OVERLAY_PTHREAD_EPOCH) || (SWIFT_SDK_OVERLAY_PTHREAD_EPOCH < 1))

The macro expansion is not properly parenthesized. The macro is used this way in the same file:

#if !_PTHREAD_SWIFT_IMPORTER_NULLABILITY_COMPAT

Which expands to:

#if !defined(SWIFT_CLASS_EXTRA) && (!defined(SWIFT_SDK_OVERLAY_PTHREAD_EPOCH) || (SWIFT_SDK_OVERLAY_PTHREAD_EPOCH < 1))

The ! only applies to the first test defined(SWIFT_CLASS_EXTRA) not to the whole boolean expression.

This seems to be a bug in <pthread.h> for Apple to fix.

ALTree mentioned this issue May 5, 2020

cmd/build: debug and test fail to run on mac OS 10.15.4 #38552

Closed

ALTree added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label May 5, 2020

ALTree added this to the Go1.15 milestone May 5, 2020

ianlancetaylor added the OS-Darwin label May 5, 2020

Sr0121 closed this as completed May 6, 2020

codingwatching mentioned this issue Jul 16, 2021

How to run webcraft on MacOS sciner/webcraft#1

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runtime/cgo: macro expansion producing 'defined' has undefined behavior #38876

runtime/cgo: macro expansion producing 'defined' has undefined behavior #38876

Sr0121 commented May 5, 2020

ALTree commented May 5, 2020 •

edited

ianlancetaylor commented May 5, 2020

Sr0121 commented May 5, 2020 •

edited

ianlancetaylor commented May 6, 2020

Sr0121 commented May 6, 2020

ianlancetaylor commented May 6, 2020

victorneuret commented May 6, 2020

Sr0121 commented May 6, 2020

stephanGarland commented May 11, 2020

erikterwiel commented May 19, 2020

codeBehindMe commented May 27, 2020

sharpSteff commented Jul 12, 2020

sharpSteff commented Jul 12, 2020

codeBehindMe commented Jul 12, 2020

kangkang59812 commented Jul 28, 2020

kangkang59812 commented Jul 28, 2020

emil-j-olsson commented Aug 5, 2020

vietvudanh commented Aug 16, 2020

qxysg1273 commented May 4, 2021

chengengliu commented Jun 16, 2021 •

edited

chengengliu commented Jun 16, 2021

yamasite commented Oct 2, 2021 •

edited

chqrlie commented May 8, 2022 •

edited

runtime/cgo: macro expansion producing 'defined' has undefined behavior #38876

runtime/cgo: macro expansion producing 'defined' has undefined behavior #38876

Comments

Sr0121 commented May 5, 2020

What version of Go are you using (go version)?

Does this issue reproduce with the latest release?

What operating system and processor architecture are you using (go env)?

What did you do?

What did you expect to see?

What did you see instead?

ALTree commented May 5, 2020 • edited

ianlancetaylor commented May 5, 2020

Sr0121 commented May 5, 2020 • edited

ianlancetaylor commented May 6, 2020

Sr0121 commented May 6, 2020

ianlancetaylor commented May 6, 2020

victorneuret commented May 6, 2020

Sr0121 commented May 6, 2020

stephanGarland commented May 11, 2020

erikterwiel commented May 19, 2020

codeBehindMe commented May 27, 2020

sharpSteff commented Jul 12, 2020

sharpSteff commented Jul 12, 2020

codeBehindMe commented Jul 12, 2020

kangkang59812 commented Jul 28, 2020

kangkang59812 commented Jul 28, 2020

emil-j-olsson commented Aug 5, 2020

vietvudanh commented Aug 16, 2020

qxysg1273 commented May 4, 2021

chengengliu commented Jun 16, 2021 • edited

chengengliu commented Jun 16, 2021

yamasite commented Oct 2, 2021 • edited

chqrlie commented May 8, 2022 • edited

What version of Go are you using (`go version`)?

What operating system and processor architecture are you using (`go env`)?

ALTree commented May 5, 2020 •

edited

Sr0121 commented May 5, 2020 •

edited

chengengliu commented Jun 16, 2021 •

edited

yamasite commented Oct 2, 2021 •

edited

chqrlie commented May 8, 2022 •

edited