Hi,
Can anyone tell me what I'm doing wrong when building a go program that
uses the ImageMagick library that has been installed to a non-standard
location.
What I think I'm seeing is that the program builds, but a flag telling the
program to look in the non-standard location for the dynamic library isn't
set _somewhere_ and so the program fails to be able to locate the library.
Steps to reproduce are:
Configure ImageMagick to install to a non-standard directory and build it:
# ./configure --prefix="/temp/imagemagick-temp" --without-magick-plus-plus
--without-perl --disable-openmp --with-gvc=no
# make install
Add the pkgconfig directory to PKG_CONFIG_PATH so that pkg-config can find
it.
# export PKG_CONFIG_PATH=/temp/imagemagick-temp/lib/pkgconfig
Check that pkg-config is happy and can find it:
# pkg-config --cflags --libs MagickWand MagickCore
-DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16
-I/temp/imagemagick-temp/include/ImageMagick-6
-L/temp/imagemagick-temp/lib -lMagickWand-6.Q16 -lMagickCore-6.Q16
Build the program and capture all output:
# go build -v -x debug.go > debug_build.txt 2>&1
Attempt to run it:
# ./debug
./debug: error while loading shared libraries: libMagickWand-6.Q16.so.2:
cannot open shared object file: No such file or directory
I've also run the program through strace to capture all system calls, and
that capture is below. It shows that the program isn't looking in the right
place for the libary file.
What do I need to do to make the program be able to find the library when
it's in that custom location?
cheers
Dan
p.s. in case it matters I'm using "go version go1.6.2 linux/amd64" on
Centos6.4
----debug.go
package main
/*
#cgo !no_pkgconfig pkg-config: MagickWand MagickCore
#include <wand/MagickWand.h>
*/
import "C"
import "fmt"
type KernelInfoType int
const (
KERNEL_UNDEFINED KernelInfoType = C.UndefinedKernel
)
func main() {
fmt.Println("Hello world")
}
-----------
----debug_build.txt
WORK=/tmp/go-build568335569
command-line-arguments
mkdir -p $WORK/command-line-arguments/_obj/
mkdir -p $WORK/command-line-arguments/_obj/exe/
cd /home/github/golang/goworkspace/src/debug
pkg-config --cflags MagickWand MagickCore
pkg-config --libs MagickWand MagickCore
CGO_LDFLAGS="-g" "-O2" "-L/temp/imagemagick-temp/lib" "-lMagickWand-6.Q16"
"-lMagickCore-6.Q16" /home/github/golang/go/pkg/tool/linux_amd64/cgo
-objdir $WORK/command-line-arguments/_obj/ -importpath
command-line-arguments -- -DMAGICKCORE_HDRI_ENABLE=0
-DMAGICKCORE_QUANTUM_DEPTH=16
-I/temp/imagemagick-temp/include/ImageMagick-6 -I
$WORK/command-line-arguments/_obj/ debug.go
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -DMAGICKCORE_HDRI_ENABLE=0
-DMAGICKCORE_QUANTUM_DEPTH=16
-I/temp/imagemagick-temp/include/ImageMagick-6 -I
$WORK/command-line-arguments/_obj/ -g -O2 -o
$WORK/command-line-arguments/_obj/_cgo_main.o -c
$WORK/command-line-arguments/_obj/_cgo_main.c
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -DMAGICKCORE_HDRI_ENABLE=0
-DMAGICKCORE_QUANTUM_DEPTH=16
-I/temp/imagemagick-temp/include/ImageMagick-6 -I
$WORK/command-line-arguments/_obj/ -g -O2 -o
$WORK/command-line-arguments/_obj/_cgo_export.o -c
$WORK/command-line-arguments/_obj/_cgo_export.c
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -DMAGICKCORE_HDRI_ENABLE=0
-DMAGICKCORE_QUANTUM_DEPTH=16
-I/temp/imagemagick-temp/include/ImageMagick-6 -I
$WORK/command-line-arguments/_obj/ -g -O2 -o
$WORK/command-line-arguments/_obj/debug.cgo2.o -c
$WORK/command-line-arguments/_obj/debug.cgo2.c
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -o
$WORK/command-line-arguments/_obj/_cgo_.o
$WORK/command-line-arguments/_obj/_cgo_main.o
$WORK/command-line-arguments/_obj/_cgo_export.o
$WORK/command-line-arguments/_obj/debug.cgo2.o -g -O2
-L/temp/imagemagick-temp/lib -lMagickWand-6.Q16 -lMagickCore-6.Q16
/home/github/golang/go/pkg/tool/linux_amd64/cgo -objdir
$WORK/command-line-arguments/_obj/ -dynpackage main -dynimport
$WORK/command-line-arguments/_obj/_cgo_.o -dynout
$WORK/command-line-arguments/_obj/_cgo_import.go
cd $WORK
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -no-pie -c trivial.c
cd /home/github/golang/goworkspace/src/debug
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -o
$WORK/command-line-arguments/_obj/_all.o
$WORK/command-line-arguments/_obj/_cgo_export.o
$WORK/command-line-arguments/_obj/debug.cgo2.o -g -O2
-L/temp/imagemagick-temp/lib -Wl,-r -nostdlib -Wl,--build-id=none
/home/github/golang/go/pkg/tool/linux_amd64/compile -o
$WORK/command-line-arguments.a -trimpath $WORK -p main -buildid
f97632daf57e18f83c78ba78cc2d1ac8f96a4d1f -D
_/home/github/golang/goworkspace/src/debug -I $WORK -pack
$WORK/command-line-arguments/_obj/_cgo_gotypes.go
$WORK/command-line-arguments/_obj/debug.cgo1.go
$WORK/command-line-arguments/_obj/_cgo_import.go
pack r $WORK/command-line-arguments.a
$WORK/command-line-arguments/_obj/_all.o # internal
cd .
/home/github/golang/go/pkg/tool/linux_amd64/link -o
$WORK/command-line-arguments/_obj/exe/a.out -L $WORK -extld=gcc
-buildmode=exe -buildid=f97632daf57e18f83c78ba78cc2d1ac8f96a4d1f
$WORK/command-line-arguments.a
cp $WORK/command-line-arguments/_obj/exe/a.out debug
-----------
----debug_strace.txt
execve("./debug", ["./debug"], [/* 28 vars */]) = 0
brk(0) = 0xc44000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7facec440000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=30417, ...}) = 0
mmap(NULL, 30417, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7facec438000
close(3) = 0
open("/lib64/tls/x86_64/libMagickWand-6.Q16.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat("/lib64/tls/x86_64", 0x7fff50c5d9e0) = -1 ENOENT (No such file or
directory)
open("/lib64/tls/libMagickWand-6.Q16.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat("/lib64/tls", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
open("/lib64/x86_64/libMagickWand-6.Q16.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat("/lib64/x86_64", 0x7fff50c5d9e0) = -1 ENOENT (No such file or
directory)
open("/lib64/libMagickWand-6.Q16.so.2", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat("/lib64", {st_mode=S_IFDIR|0555, st_size=12288, ...}) = 0
open("/usr/lib64/tls/x86_64/libMagickWand-6.Q16.so.2", O_RDONLY) = -1
ENOENT (No such file or directory)
stat("/usr/lib64/tls/x86_64", 0x7fff50c5d9e0) = -1 ENOENT (No such file or
directory)
open("/usr/lib64/tls/libMagickWand-6.Q16.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat("/usr/lib64/tls", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
open("/usr/lib64/x86_64/libMagickWand-6.Q16.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat("/usr/lib64/x86_64", 0x7fff50c5d9e0) = -1 ENOENT (No such file or
directory)
open("/usr/lib64/libMagickWand-6.Q16.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat("/usr/lib64", {st_mode=S_IFDIR|0555, st_size=20480, ...}) = 0
writev(2, [{"./debug", 7}, {": ", 2}, {"error while loading shared
libra"..., 36}, {": ", 2}, {"libMagickWand-6.Q16.so.2", 24}, {": ", 2},
{"cannot open shared object file", 30}, {": ", 2}, {"No such file or
directory", 25}, {"\n", 1}], 10./debug: error while loading shared
libraries: libMagickWand-6.Q16.so.2: cannot open shared object file: No
such file or directory
) = 131
exit_group(127) = ?
+++ exited with 127 +++
-----------
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