Re: [Gtk-osx-users] posix_memalign in libSystem.B

[John Ralls <jralls ceridwen us>]

On Aug 1, 2011, at 4:17 AM, MaSch wrote:

> Hello,
> 
> I tried making my gtk App work on Lion and applied :
> - Patch for crash with undecorated windows on MacOS Lion (gtk+ Bug 655074)
> - Patch for resizing window on MacOS Lion (gtk+ Bug 655122)
> - Skipped libiconv in jhbuild and instead using the system one.
> 
> In preliminary testing this all works very well for me on 10.7 and 10.6.
> But when I test my app on 10.5 I get :
> 
>> OS Version:      Mac OS X 10.5.6 (9G66)
>> Report Version:  6
>> 
>> Exception Type:  EXC_BREAKPOINT (SIGTRAP)
>> Exception Codes: 0x0000000000000002, 0x0000000000000000
>> Crashed Thread:  0
>> 
>> Dyld Error Message:
>>  Symbol not found: _posix_memalign
>>  Referenced from: ///Users/user/Desktop/EasyTAG.app/Contents/Resources/lib/libglib-2.0.0.dylib
>>  Expected in: /usr/lib/libSystem.B.dylib
> 
> This is probably to be expected because googling showed that
> "posix_memalign" support was introduced in Mac OS 10.6 and is not
> available on <= 10.5.
> 
> What I do not understand is even though I compiled on 10.7 with 10.6
> Target SDK (which exposes posix_memalign) I specified
> "mmacosx-version-min=10.4" .
> 
> glib's configure log indicates of course that posix_memalign was turned on :
> 
>> configure:20598: checking for posix_memalign
>> configure:20598: /usr/bin/gcc-4.2 -o conftest -arch i386 -I/Developer/SDKs/MacOSX10.6.sdk/usr/include -isysroot /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.4 -Wall -I/Users/gtkdev2/gtk/inst/include -I/Developer/SDKs/MacOSX10.6.sdk/usr/include -DG_DISABLE_SINGLE_INCLUDES -L/Users/gtkdev2/gtk/inst/lib -L/Users/gtkdev2/gtk/inst/lib -arch i386 -L/Developer/SDKs/MacOSX10.6.sdk/usr/lib -isysroot /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.4 -Wl,-headerpad_max_install_names -framework Carbon conftest.c -lintl   >&5
>> configure:20598: $? = 0
>> configure:20598: result: yes
> 
> I suppose this is some configure bug on glib's side ? Or is it Apple's
> fault ? Or mine ? Any ideas ?
> 
> I could of course build with 10.5 SDK, but unfortunately this isn't
> included with Xcode 4 anymore so I would have to install Xcode 3 side by
> side or extract the old SDKs from the Xcode 3 pkgs ...
> For now I have opted to manually edit glibs configure and remove
> posix_memalign then it falls back to more primitive allocation methods.
> 

Unfortunately the Apple doesn't mark the regular unix headers (posix_memalign is in stdlib.h) with version information, so setting macosx-version-min doesn't help. Fiddling the GLib configure is the right thing to do. Thanks for reporting this.

As an aside, neither XCode 3 nor the older SDKs work on Lion, so we have to make everything build against SDK10.6 and able to run on 10.4. That's going to take a while, and the more testing the better.

Regards,
John Ralls