From: Charlie Savage <redmine@...>
Date: 2009-01-27T16:16:45+09:00
Subject: [ruby-core:21598] [Bug #1060] mkmf refuses to find 3rd party extensions - ruby 1.9.1 trunk

Bug #1060: mkmf refuses to find 3rd party extensions - ruby 1.9.1 trunk
http://redmine.ruby-lang.org/issues/show/1060

Author: Charlie Savage
Status: Open, Priority: High
Category: core, Target version: 1.9.1
Reproducible Version: 1.9.1 RC2

When building with msys/mingw, mkmf incorrectly says header files don't exist when in fact they do.  This happens when building the extensions for curses (PDCurses), tk, zlib etc.

Let's use tk as an example.  I downloaded, built and successfully installed tcl and tk using MinGw, on Vista, gcc 3.4.5.  Then, I built ruby.  As mentioned, the tk extension isn't built.  Looking at ext/tk/mkmf.log:

find_header: checking for tcl.h in ... -------------------- no

"gcc -E -I../../.ext/include/i386-mingw32 -I../.././include -I../.././ext/tk -I/usr/local/include  -I/usr/local/include  -O2 -g -Wall -Wno-parentheses   conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <tcl.h>
/* end */

Except, this isn't true!  Paste the code into conftest.c, place it in ext/tk/conftest.  Then:

$ gcc -E -I../../.ext/include/i386-mingw32 -I../.././include -I../.././ext/tk -
I/usr/local/include  -I/usr/local/include  -O2 -g -Wall -Wno-parentheses   conf
test.c -o conftest.i

gcc runs fine - looking at the dirctory:

$ ll conf*
-rw-r--r-- 1 cfis Administrators     80 Jan 27 00:07 conftest.c
-rw-r--r-- 1 cfis Administrators 944777 Jan 27 00:08 conftest.i

conftest.i is built.

Yet mkmf says the header does not exist, and does not build the extension.


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