Build GLVis using gcc under MacOS

[JianboLong]

Has anyone successfully built GLVis on MacOS using gcc installed by brew ? Related to a previous issue, it seems there's still troubles building GLVis this way. I wonder if there's any solution ? Please see my comment to that previous issue (#178)

          Hello @ilonster @tzanio  I am having similar troubles in building GLVis 4.2 on MacOS Ventura. For other reasons, I could only build MFEM using gcc, instead of Apple's clang. I am trying to build GLVis using the same compiler and flags, but got SDK related errors (see below).  Any solutions for this ?

g++ -O3 -std=c++11 -I../mfem_build -DGLVIS_MULTISAMPLE=4 -DGLVIS_MS_LINEWIDTH=1.0 -DGLVIS_OGL3 -DGLVIS_USE_LOGO -I/usr/local/include/freetype2 -I/usr/local/include -I/usr/local/include -I/usr/local/include -DGLVIS_USE_LIBPNG -o lib/sdl_mac.o -c lib/sdl_mac.mm
g++ -O3 -std=c++11 -I../mfem_build -DGLVIS_MULTISAMPLE=4 -DGLVIS_MS_LINEWIDTH=1.0 -DGLVIS_OGL3 -DGLVIS_USE_LOGO -I/usr/local/include/freetype2 -I/usr/local/include -I/usr/local/include -I/usr/local/include -DGLVIS_USE_LIBPNG -o share/logo.rgba.bin.o -c share/logo.rgba.bin.cpp
lib/sdl_mac.mm:37:4: error: stray '@' in program
37 | @autoreleasepool
| ^
lib/sdl_mac.mm:50:4: error: stray '@' in program
50 | @autoreleasepool
| ^
lib/sdl_mac.mm:82:4: error: stray '@' in program
82 | @autoreleasepool
| ^
lib/sdl_mac.mm:92:4: error: stray '@' in program
92 | @autoreleasepool
| ^
lib/sdl_mac.mm:102:4: error: stray '@' in program
102 | @autoreleasepool
| ^
lib/sdl_mac.mm:113:4: error: stray '@' in program
113 | @autoreleasepool
| ^
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include/dispatch/dispatch.h:63,
from /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFStream.h:20,
from /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFPropertyList.h:17,
from /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:66,
from /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6,
from /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12,
from lib/sdl_mac.mm:13:
/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include/os/object.h:206:1: error: expected unqualified-id before 'interface'
206 | OS_OBJECT_DECL_BASE(object, NSObject);
| ^~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include/os/workgroup_object.h:49:1: error:expected unqualified-id before 'interface'
49 | OS_WORKGROUP_DECL(os_workgroup, WorkGroup);
| ^~~~~~~~~~~~~~~~~

Originally posted by @JianboLong in #178 (comment)

[v-dobrev]

On Mac we have some Objective C++ sources that allow us to use some Mac-specific (Cocoa) stuff. I'm not sure GCC really supports this type of sources, so I think you need to use Apple's clang compiler, clang++.

[tzanio]

There is also a Mac binary that you can download and use directly: https://bit.ly/glvis-mac