Install on mac failed about goncurses HOT 26 CLOSED

Please update to the latest go1 release or tip and retry. It is also possible 
that your version of ncurses.h defines has_mouse() as a macro which cgo does 
not play nicely with. What version of ncurses do you have installed? Can you 
grep ncurses.h for has_mouse and determine if has_mouse() has been defined as a 
macro?

go version weekly.2012-03-27 +d13076ae2f82 is the head of hg and is considered 
to be ahead of go1.0.2

Well it seems that ncurses comes with mac does not contain any thing about 
has_mouse.
Then I tried to compile my own libncurses with version 5.9 and then change the 
curses.go as bellow

// #cgo LDFLAGS: -L/usr/local/lib -I/usr/local/include -lncurses
// #include <ncurses/ncurses.h>

Then try build again and get errors like:
form.go:336[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/c
ode.google.com/p/goncurses/_obj/form.cgo1.go:325]: cannot use w.win (type 
*_Ctype_WINDOW) as type *[0]byte in function argument
form.go:342[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/c
ode.google.com/p/goncurses/_obj/form.cgo1.go:332]: cannot use w.win (type 
*_Ctype_WINDOW) as type *[0]byte in function argument
form.go:348[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/c
ode.google.com/p/goncurses/_obj/form.cgo1.go:339]: cannot use 
_Cfunc_form_sub(f.form) (type *[0]byte) as type *_Ctype_WINDOW in field value
menu.go:299[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/c
ode.google.com/p/goncurses/_obj/menu.cgo1.go:294]: cannot use w.win (type 
*_Ctype_WINDOW) as type *[0]byte in function argument
menu.go:314[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/c
ode.google.com/p/goncurses/_obj/menu.cgo1.go:315]: cannot use sub.win (type 
*_Ctype_WINDOW) as type *[0]byte in function argument
menu.go:326[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/c
ode.google.com/p/goncurses/_obj/menu.cgo1.go:329]: cannot use 
_Cfunc_menu_win(m.menu) (type *[0]byte) as type *_Ctype_WINDOW in field value
panel.go:56[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/c
ode.google.com/p/goncurses/_obj/panel.cgo1.go:19]: cannot use w.win (type 
*_Ctype_WINDOW) as type *[0]byte in function argument
panel.go:120[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/
code.google.com/p/goncurses/_obj/panel.cgo1.go:89]: cannot use w.win (type 
*_Ctype_WINDOW) as type *[0]byte in function argument
panel.go:144[/var/folders/ps/fg9q9gq50gx_dxcfg7r8rlzw0000gn/T/go-build799170292/
code.google.com/p/goncurses/_obj/panel.cgo1.go:116]: cannot use 
_Cfunc_panel_window(p.pan) (type *[0]byte) as type *_Ctype_WINDOW in field value

Since the release of go1 they no longer maintaining the 'weekly' releases. 
'tip' is considered the latest post-go1.0.2:

tip                            13624:b7a1cd9f1a6c
release                        13231:5e806355a9e1
go1.0.2                        13231:5e806355a9e1
go1.0.1                        12995:2ccfd4b451d3
go1                            12872:920e9d1ffd1f
weekly.2012-03-27              12869:dc5e410f0b4c

It seems that now the ncurses extensions (form, menu and panel) are causing you 
issue. You you tried changing the cgo flags to reflect your new installation of 
ncurses for the other libraries? I have been toying with the idea of separating 
these libraries from the ncurses core rather than bundling them. This would 
enforce an import of .../goncurses/form for example. This would at least let 
you use the ncurses portion of the library. 

After a great deal of searching, it appears that ncurses 5.7 is the most 
current version of ncurses on MacOS X. In 5.8 [1], has_mouse() was added which 
is why it did not work on your system. I will make a note in the wiki regarding 
this issue.

[1] http://invisible-island.net/ncurses/announce-5.8.html

I just installed ncurses 5.9 using Homebrew and I'm still getting the 
'has_mouse' undeclared error.

NOTE: I had to apply the patch from this thread to get ncurses to install 
successfully: 
http://lists.gnu.org/archive/html/bug-ncurses/2011-04/msg00002.html

$ brew list --versions go
go 1.0.2

$ brew list --versions ncurses
ncurses 5.9

$ go get code.google.com/p/goncurses
# code.google.com/p/goncurses
error: 'has_mouse' undeclared (first use in this function)
error: (Each undeclared identifier is reported only once

Here's a relevant grep:

$ grep -r has_mouse .
./curses.h:extern NCURSES_EXPORT(bool)    has_mouse(void);
./curses.h:extern NCURSES_EXPORT(bool)    NCURSES_SP_NAME(has_mouse) (SCREEN*);
./cursesw.h:extern "C" int     _nc_has_mouse(void);
./cursesw.h:  bool has_mouse() const;
./ncurses.h:extern NCURSES_EXPORT(bool)    has_mouse(void);
./ncurses.h:extern NCURSES_EXPORT(bool)    NCURSES_SP_NAME(has_mouse) (SCREEN*);

I've implemented a potential fix for this issue. Forms, Menu and Panel are now 
separated from the main library and will now need to be imported individually.

Second, I've created a work-around for has_mouse. Hopefully this will solve the 
issue as I have no way of testing it myself.

Thanks for looking into this.

I'm getting a different error now:

$ go get -u code.google.com/p/goncurses
# code.google.com/p/goncurses
cc1: warnings being treated as errors
ncurses.go: In function 'ncurses_has_mouse':
ncurses.go:48: warning: implicit declaration of function 'has_mouse'

The implicit declaration error usually indicates that a C function declaration 
is missing but your grep would indicate otherwise. It's possible that this is a 
clang/llvm issue, or a cgo issue on OSX, but I can't say for certain. I'll 
continue to research to see what might be the issue.

Thanks! Let me know if there's anything other info about my system that would 
be helpful.

Also, I'll try to apply the post-5.9 patches to my ncurses library and see if 
that makes a difference.

Can you try writing an ncurses program in C to verify has_mouse() works 
natively?

I copied the hello world example, compiled, and ran it without error:
http://tldp.org/HOWTO/NCURSES-Programming-HOWTO/helloworld.html

But my C foo is weak, and I'm guessing it linked against the system version of 
ncurses (5.7.20081102). How do I force it to link against 5.9?

Looks like '-include' is what I needed:

$ gcc -include /usr/local/Cellar/ncurses/5.9/include/ncurses/ncurses.h hello.c
Undefined symbols for architecture x86_64:
  "_initscr", referenced from:
      _main in ccDlKAbl.o
  "_printw", referenced from:
      _main in ccDlKAbl.o
  "_stdscr", referenced from:
      _main in ccDlKAbl.o
  "_wrefresh", referenced from:
      _main in ccDlKAbl.o
  "_wgetch", referenced from:
      _main in ccDlKAbl.o
  "_endwin", referenced from:
      _main in ccDlKAbl.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

I haven't applied the various ncurses patches yet. Doing that next.

I applied the following rollup patch: 
ftp://invisible-island.net/ncurses/5.9/ncurses-5.9-20120616-patch.sh.bz2

It didn't address the has_mouse issue. :(

Similar output from clang:

$ clang -I/usr/local/Cellar/ncurses/5.9/include/ncurses/ncurses.h hello.c
Undefined symbols for architecture x86_64:
  "_initscr", referenced from:
      _main in hello-13MyQM.o
  "_printw", referenced from:
      _main in hello-13MyQM.o
  "_stdscr", referenced from:
      _main in hello-13MyQM.o
  "_wrefresh", referenced from:
      _main in hello-13MyQM.o
  "_wgetch", referenced from:
      _main in hello-13MyQM.o
  "_endwin", referenced from:
      _main in hello-13MyQM.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I assume this means I'm mixing 32 and 64 bit code, but I'm not sure what to do 
about it.

Run the following on that hello world example, if it successfully linked and 
compiled, (assumes binary is named 'a.out'; if you used -o flag replace a.out 
with whatever you named the binary) in order to see what library was linked 
against it: 

$ldd a.out | grep curses

It will be something akin to /usr/lib/libncursesw.so.5 but this is likely a 
symbolic link. Use:

$ls -l /usr/lib/libncursesw.so.5

To find out what it links to. If the result is libncursesw.so.5.9 then it's 
linking against your updated library.

I would also be interested to know the output of:

$pkg-config ncurses --modversion

...if any. I don't know if OSX has pkg-config installed or if homebrew installs 
a .pc file for ncurses. If the reported version is 5.9 then I may be able to 
leverage pkg-config to at least ensure the correct library is used.

There's no ldd in OS X, but there is otool.

The hello world that works is linked against the version of ncurses that comes 
with OS X, not with the Homebrew version:

$ gcc hello.c -lncurses
$ otool -L a.out |grep curses
    /usr/lib/libncurses.5.4.dylib (compatibility version 5.4.0, current version 5.4.0)

ls -l /usr/lib/libncurses.5.4.dylib 
-rwxr-xr-x 1 root wheel 546K Oct  8  2011 /usr/lib/libncurses.5.4.dylib*

pkg-config is in OS X, but not helpful in this case:

$ pkg-config ncurses --modversion
Package ncurses was not found in the pkg-config search path.
Perhaps you should add the directory containing `ncurses.pc'
to the PKG_CONFIG_PATH environment variable
No package 'ncurses' found

I can't figure out how to link hello.c against the Homebrew version of ncurses. 
I keep getting "Undefined symbols for architecture" errors.

To link against a specific library, simply include the library in the 
objects/sources to compile. Example:

$gcc -o hello hello.c /usr/lib/libncurses.so.5.9

Judging by the fact that your system is linking against the 5.7 ncurses 
previously installed on your system, go/cgo will too. This is probably why 
has_mouse() is still undefined/unresolved. If this is the case and you can 
successfully compile and run the C code, the simplest way to make the change 
permanent is to alter the libncurses.so symlink to point to the 5.9 version. 
Please take this advice at your own risk. If this works, I highly recommend you 
contact the homebrew people to see if they can create a fix for this. 

Please let me know the result so I can either close this issue or continue to 
research another solution.

Sorry for the delay, I wasn't notified (or perhaps didn't see a notification) 
of your last comment.

I was able to get the example to successfully compile with the latest version 
of ncurses by specifying the path as you advised:

$ gcc -o hello hello.c /usr/local/lib/libncurses.dylib 
$ otool -L hello
hello:
    /usr/local/lib/libncurses.5.dylib (compatibility version 5.0.0, current version 5.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)

After modifying the libncurses symlinks in /usr/lib to point /usr/local/lib. I 
was again able to successfully compile against the latest ncurses, this time 
without specifying the path:

$ gcc -o hello hello.c -lncurses
$ otool -L hello
hello:
    /usr/local/lib/libncurses.5.dylib (compatibility version 5.0.0, current version 5.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)

However, "go get" still wasn't working:

$ go get -u code.google.com/p/goncurses
# code.google.com/p/goncurses
cc1: warnings being treated as errors
ncurses.go: In function 'ncurses_has_mouse':
ncurses.go:20: warning: implicit declaration of function 'has_mouse'

So I cloned this repo (http://code.google.com/r/gcatlin-goncurses/), added an 
absolute path to the #include (http://goo.gl/6htPe), pushed it, then ran go get 
on the cloned repo:

$ go get -u code.google.com/p/gcatlin-goncurses

There was no output that time. A simple test (which may be worth adding to your 
home page) confirmed that it installed successfully:

---
package main

import goncurses "code.google.com/p/gcatlin-goncurses"

func main() {
    w, _ := goncurses.Init()
    defer goncurses.End()
    w.Print("Hello World! Press any key to quit.")
    w.Refresh()
    w.GetChar()
}
---

Clearly, my solution is not tenable, but it may be worth documenting as a 
work-around.

I have just pushed an alternative fix that should allow goncurses to build on 
ncurses 5.7. I will also update the wiki to include your work-around, or 
something similar, since it would be preferable if users linked against version 
5.9.

Wiki has been updated and the issue is considered closed.

First, let me express my appreciation for working with me on trying to resolve 
this issue. Thank you!

Second and unfortunately, it is still not working, although it appears to be 
getting closer:

$ go get -u code.google.com/p/goncurses
# code.google.com/p/goncurses
window.go:250[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build629847214
/code.google.com/p/goncurses/_obj/window.cgo1.go:272]: w.win._cury undefined 
(type *[0]byte has no field or method _cury)
window.go:250[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build629847214
/code.google.com/p/goncurses/_obj/window.cgo1.go:272]: w.win._curx undefined 
(type *[0]byte has no field or method _curx)
window.go:263[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build629847214
/code.google.com/p/goncurses/_obj/window.cgo1.go:287]: w.win._clear undefined 
(type *[0]byte has no field or method _clear)
window.go:268[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build629847214
/code.google.com/p/goncurses/_obj/window.cgo1.go:293]: w.win._use_keypad 
undefined (type *[0]byte has no field or method _use_keypad)
window.go:285[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build629847214
/code.google.com/p/goncurses/_obj/window.cgo1.go:312]: w.win._maxy undefined 
(type *[0]byte has no field or method _maxy)
window.go:285[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build629847214
/code.google.com/p/goncurses/_obj/window.cgo1.go:312]: w.win._maxx undefined 
(type *[0]byte has no field or method _maxx)
window.go:322[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build629847214
/code.google.com/p/goncurses/_obj/window.cgo1.go:354]: w.win._parent undefined 
(type *[0]byte has no field or method _parent)

[deleted comment]

I have pushed some changes which should fix these additional issues. Let me 
know if this works!

Almost there.

$ go get -u code.google.com/p/goncurses
# code.google.com/p/goncurses
window.go:326[/var/folders/s5/fg_990bd4qn035mcbx8r41vm0000gn/T/go-build763017235
/code.google.com/p/goncurses/_obj/window.cgo1.go:359]: w.win._parent undefined 
(type *[0]byte has no field or method _parent)

Pushed a fix for this. Hopefully this will be the final issue. 

If this works, you could consider trying to enable one of the extensions, panel 
would probably be the best choice, by modifying panel_posix.go and adding 
'darwin' to the list of platforms in the +build section. If it fails, please 
open a separate issue.

It works! Thanks for your persistence.

I'll look into enabling the extensions.