cmd/ld: multiple definition of `__moddi3' under archlinux/go1.4/i686

[fasheng]

I build a sample for this case and tested on platforms and architectures. Only archlinux/go1.4/i686 could not compile success.

Here is the error messages, results table and sample code(package github.com/mattn/go-sqlite3 is required).

Error

/var/tmp/go-link-2fmgPU/000002.o: In function `__moddi3':
(.text+0x75460): multiple definition of `__moddi3'
/var/tmp/go-link-2fmgPU/00000.o:(.text+0xf70): first defined here
collect2: error: ld returned 1 exit status
/usr/lib/go/pkg/tool/linux_386/8l: running gcc failed: unsuccessful exit status 0x100

Results

  | platform     | arch   | version            | result |
  |--------------+--------+--------------------+--------|
  | archlinux    | i686   | go 2:1.4-1         | failed |
  | archlinux    | x86_64 | go 2:1.4-1         | ok     |
  | archlinux    | i686   | go 2:1.3.3-1       | failed |
  | archlinux    | x86_64 | go 2:1.3.3-1       | ok     |
  | ubuntu 14.04 | i686   | evarlast/golang1.4 | ok     |
  | ubuntu 14.04 | x86_64 | evarlast/golang1.4 | ok     |
  | ubuntu 14.04 | i686   | golang 2:1.3.3-1.1 | ok     |
  | ubuntu 14.04 | x86_64 | golang 2:1.3.3-1.1 | ok     |

Sample

package main

// #cgo CFLAGS: -Wall -g
// #include <stdlib.h>
// #include <sys/types.h>  /* for time_t */
//
// typedef long int_fast32_t;
// typedef long long intmax_t;
//
// #define SECSPERMIN   60
// #define MINSPERHOUR  60
// #define SECSPERHOUR  (SECSPERMIN * MINSPERHOUR)
// #define HOURSPERDAY  24
// #define EPOCH_YEAR   1970
// #define DAYSPERNYEAR 365
// #define SECSPERDAY   ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
// #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
// #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
//
// #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
//
// time_t
// yeartot(const intmax_t y)
// {
//     register intmax_t   myy, seconds, years;
//     register time_t     t;
//     myy = EPOCH_YEAR;
//     t = 0;
//     while (myy < y) {
//         seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
//         years = 1;
//         myy += years;
//         t += seconds;
//     }
//     return t;
// }
import "C"

import (
    "fmt"
    _ "github.com/mattn/go-sqlite3"
)

func main() {
    fmt.Printf("Hello, world\n")
}

[mwhudson]

This looks more likely to be a bug in the gcc(go) bits than the go bits. Can you show the version of the gcc/gccgo/gccgo-4.9 packages you have installed? And a gist of the output of running go build -compiler gccgo -x ?

[fasheng]

For ubuntu, gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2.
For archlinux, gcc (GCC) 4.9.2 20141224 (prerelease).

And gccgo just build succeeded in archlinux/i686, here is the output,

WORK=/tmp/go-build056603244
mkdir -p $WORK/github.com/mattn/go-sqlite3/_obj/
mkdir -p $WORK/github.com/mattn/
cd /usr/lib/go/site/src/github.com/mattn/go-sqlite3
CGO_LDFLAGS="-g" "-O2" "-ldl" "-lsqlite3" /usr/lib/go/pkg/tool/linux_386/cgo -objdir $WORK/github.com/mattn/go-sqlite3/_obj/ -gccgo -gccgopkgpath=github.com/mattn/go-sqlite3 -- -I $WORK/github.com/mattn/go-sqlite3/_obj/ -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE backup.go error.go sqlite3.go sqlite3_other.go
gcc -Wall -g -I $WORK/github.com/mattn/go-sqlite3/_obj/ -I /usr/lib/go/pkg/linux_386 -o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_defun.o -D GOOS_linux -D GOARCH_386 -m32 -D "GOPKGPATH=\"github_com_mattn_go_sqlite3\"" -c $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_defun.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -print-libgcc-file-name
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/github.com/mattn/go-sqlite3/_obj/ -g -O2 -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_main.o -c $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_main.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/github.com/mattn/go-sqlite3/_obj/ -g -O2 -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_export.o -c $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_export.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/github.com/mattn/go-sqlite3/_obj/ -g -O2 -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -o $WORK/github.com/mattn/go-sqlite3/_obj/backup.cgo2.o -c $WORK/github.com/mattn/go-sqlite3/_obj/backup.cgo2.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/github.com/mattn/go-sqlite3/_obj/ -g -O2 -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -o $WORK/github.com/mattn/go-sqlite3/_obj/error.cgo2.o -c $WORK/github.com/mattn/go-sqlite3/_obj/error.cgo2.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/github.com/mattn/go-sqlite3/_obj/ -g -O2 -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.cgo2.o -c $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.cgo2.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/github.com/mattn/go-sqlite3/_obj/ -g -O2 -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3_other.cgo2.o -c $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3_other.cgo2.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/github.com/mattn/go-sqlite3/_obj/ -g -O2 -std=gnu99 -I. -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.o -c ./sqlite3.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_.o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_main.o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_export.o $WORK/github.com/mattn/go-sqlite3/_obj/backup.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/error.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3_other.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.o -g -O2 -ldl -lsqlite3
gccgo -I $WORK -c -g -m32 -fgo-pkgpath=github.com/mattn/go-sqlite3 -fgo-relative-import-path=_/usr/lib/go/site/src/github.com/mattn/go-sqlite3 -o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.o ./doc.go $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_gotypes.go $WORK/github.com/mattn/go-sqlite3/_obj/backup.cgo1.go $WORK/github.com/mattn/go-sqlite3/_obj/error.cgo1.go $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.cgo1.go $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3_other.cgo1.go
ar cru $WORK/github.com/mattn/libgo-sqlite3.a $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_defun.o $WORK/github.com/mattn/go-sqlite3/_obj/_cgo_export.o $WORK/github.com/mattn/go-sqlite3/_obj/backup.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/error.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3_other.cgo2.o $WORK/github.com/mattn/go-sqlite3/_obj/sqlite3.o
mkdir -p $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/
cd /home/fsh/tmp/go1.4_issue_386
CGO_LDFLAGS="-g" "-O2" /usr/lib/go/pkg/tool/linux_386/cgo -objdir $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/ -gccgo -- -I $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/ -Wall -g main.go
gcc -Wall -g -I $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/ -I /usr/lib/go/pkg/linux_386 -o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_defun.o -D GOOS_linux -D GOARCH_386 -m32 -c $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_defun.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/ -g -O2 -Wall -g -o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_main.o -c $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_main.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/ -g -O2 -Wall -g -o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_export.o -c $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_export.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -I $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/ -g -O2 -Wall -g -o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.cgo2.o -c $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.cgo2.c
gcc -I . -fPIC -m32 -pthread -fmessage-length=0 -o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_main.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_export.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.cgo2.o -g -O2
gccgo -I $WORK -I /usr/lib/go/site/pkg/gccgo_linux_386 -c -g -m32 -fgo-relative-import-path=_/home/fsh/tmp/go1.4_issue_386 -o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_gotypes.go $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.cgo1.go
ar cru $WORK/_/home/fsh/tmp/libgo1.4_issue_386.a $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_defun.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_export.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.cgo2.o
cd .
gccgo -o go1.4_issue_386 $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_defun.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/_cgo_export.o $WORK/_/home/fsh/tmp/go1.4_issue_386/_obj/main.cgo2.o -Wl,-( -m32 $WORK/github.com/mattn/libgo-sqlite3.a -lpthread -ldl -lsqlite3 -Wl,-E -Wl,-)

[ianlancetaylor]

The names 00000.o and 000002.o indicate that the __moddi3 symbol is being defined in multiple object files compiled by gcc, which is odd. (This doesn't have anything to do with gccgo as far as I can see.)

For the failing build, please run "go build -x" and show us the complete output. Thanks.

[ianlancetaylor]

Actually, never mind, I can recreate this easily enough. Issue #9510.

Now I don't know why ArchLinux is different from any other GNU/Linux system.

[hami9x]

I'm getting the same problem on Ubuntu 14.04.

[minux]

Merge into #9510. This is a general problem, not specific to any linux distribution.