Backport #1884: ftruncate conflict with mingw32 3.4.5

• Status: Closed
• Assignee: yugui (Yuki Sonoda)

[mhulse (Matt Hulse)]

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I have been testing some gems on WinXP SP2, Ruby 1.9.1-p129 mingw32 installer and devkit from rubyinstaller.org. The following output is from an attempt to install FFI:

C:>ruby -v
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mingw32]

C:>gem install ffi
Building native extensions. This could take a while...
ERROR: Error installing ffi:
ERROR: Failed to build gem native extension.

C:/Ruby/bin/ruby.exe extconf.rb
checking for ffi_closure_alloc() in -lffi... no
creating Makefile
creating extconf.h

make
[...]
gcc -I. -IC:/Ruby/include/ruby-1.9.1/i386-mingw32 -I/C/Ruby/include/ruby-1.9.1/ruby/backward -I/C/Ruby/include/ruby-1.9.1 -I. -I/c/Ruby/lib/ruby/gems/1.9.1/gems/ffi-0.3.5/ext/ffi_c -I/c/Ruby/lib/ruby/gems/1.9.1/gems/ffi-0.3.5/ext/ffi_c/libffi/include -DHAVE_EXTCONF_H -Werror -Wunused -Wformat -I/c/Ruby/lib/ruby/gems/1.9.1/gems/ffi-0.3.5/ext/ffi_c -I/c/Ruby/lib/ruby/gems/1.9.1/gems/ffi-0.3.5/ext/ffi_c/libffi/include -O2 -g -Wall -Wno-parentheses -o Invoker.o -c Invoker.c

In file included from c:/Ruby/include/ruby-1.9.1/ruby/defines.h:192,
from c:/Ruby/include/ruby-1.9.1/ruby/ruby.h:70,
from c:/Ruby/include/ruby-1.9.1/ruby.h:32,
from Invoker.c:11:
c:/Ruby/include/ruby-1.9.1/ruby/win32.h:341: error: conflicting types for 'ftruncate'
C:/Ruby/devkit/gcc/3.4.5/bin/../lib/gcc/mingw32/3.4.5/../../../../include/unistd.h:43: error: previous definition of 'ftruncate' was here
c:/Ruby/include/ruby-1.9.1/ruby/win32.h:341: error: conflicting types for 'ftruncate'
C:/Ruby/devkit/gcc/3.4.5/bin/../lib/gcc/mingw32/3.4.5/../../../../include/unistd.h:43: error: previous definition of 'ftruncate' was here
make: *** [Invoker.o] Error 1

Apparently Ruby 1.9.1 redefines ftruncate in win32.h:341 which conflicts with mingw32. I can get the gem to compile by wrapping line 341 in win32.h with the following:

#if !defined MINGW32
extern int ftruncate(int fd, off_t length);
#endif

Luis from rubyinstaller mentioned that it may be better to check whether ftruncate is defined rather than MINGW32 just in case certain versions of mingw don't define ftruncate, but I'm not sure how to do that.
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[usa (Usaku NAKAMURA)]

• Assignee set to nobu (Nobuyoshi Nakada)

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=end

[mame (Yusuke Endoh)]

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Hi, nobu and usa

Any update here?
I guess this can be fixed easily, but do you have any serious problem?

--
Yusuke Endoh [e-mail]
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[nobu (Nobuyoshi Nakada)]

• Category set to core
• Status changed from Open to Closed

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Fixed at r27300.
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[nobu (Nobuyoshi Nakada)]

• Status changed from Closed to Assigned
• Assignee changed from nobu (Nobuyoshi Nakada) to yugui (Yuki Sonoda)

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=end

[jeremyevans0 (Jeremy Evans)]

• Description updated (diff)
• Status changed from Assigned to Closed