GLM_FORCE_CXX98 on Android

[blitz-research]

Not sure if this is a 'bug' or even worth worrying about, but I'm having to #define GLM_FORCE_CXX98 on Android, or I get a bunch of 'nextafter is not a member of std' errors when building for Android.

My application.mk file includes:

APP_STL := gnustl_static
NDK_TOOLCHAIN_VERSION :=4.8

...which appear to be required by C++11, which I use via CFLAGS in android.mk

Feel free to ignore, just a bit weird and I thought it might be worth mentioning...

[Groovounet]

Hi,

If you #define GLM_MESSAGES before including <glm.glm.hpp> what does GLM says at compilation time?

Android is quite annoying to support with all the toolchains / lib / options and quite depends on GLM users feedback. I think it's worth to try to resolve.

Thanks,
Christophe

[Groovounet]

I have added a tentative fix in GLM 0.9.5 branch for GLM 0.9.5.4 release.

Let me know if you have any issue with it.

Thanks,
Christophe

[blitz-research]

Ok, now I get _nextafter not found instead.

With GLM_MESSAGES defined, output of ndk-build is:

[armeabi-v7a] Compile++ thumb: main <= app.cpp
In file included from /defender/glm/glm/detail/type_int.hpp:32:0,
                 from /defender/glm/glm/fwd.hpp:32,
                 from /defender/glm/glm/glm.hpp:88,
                 from /defender/defender/std.h:59,
                 from /defender/defender/app.cpp:2:
/defender/glm/glm/detail/setup.hpp:95:51: note: #pragma message: GLM: Android platform detected
 #  pragma message("GLM: Android platform detected")
                                                   ^
/defender/glm/glm/detail/setup.hpp:342:48: note: #pragma message: GLM: GCC compiler detected
 #   pragma message("GLM: GCC compiler detected")
                                                ^
/defender/glm/glm/detail/setup.hpp:373:39: note: #pragma message: GLM: 32 bits model
 #  pragma message("GLM: 32 bits model")
                                       ^
/defender/glm/glm/detail/setup.hpp:472:31: note: #pragma message: GLM: C++11
 #  pragma message("GLM: C++11")
                               ^
In file included from /defender/glm/glm/detail/type_int.hpp:32:0,
                 from /defender/glm/glm/fwd.hpp:32,
                 from /defender/glm/glm/glm.hpp:88,
                 from /defender/defender/std.h:59,
                 from /defender/defender/app.cpp:2:
/defender/glm/glm/detail/setup.hpp:482:154: note: #pragma message: GLM: #define GLM_FORCE_CXX98, GLM_FORCE_CXX03, GLM_LA
NG_CXX11 or GLM_FORCE_CXX1Y to force using a specific version of the C++ language
 # pragma message("GLM: #define GLM_FORCE_CXX98, GLM_FORCE_CXX03, GLM_LANG_CXX11 or GLM_FORCE_CXX1Y to force using a spe
cific version of the C++ language")

                                  ^
/defender/glm/glm/detail/setup.hpp:635:51: note: #pragma message: GLM: Platform independent code
 #  pragma message("GLM: Platform independent code")
                                                   ^
/defender/glm/glm/detail/setup.hpp:647:97: note: #pragma message: GLM: #define GLM_FORCE_PURE to avoid using platform sp
ecific instruction sets
 # pragma message("GLM: #define GLM_FORCE_PURE to avoid using platform specific instruction sets")
                                                                                                 ^
/defender/glm/glm/detail/setup.hpp:715:103: note: #pragma message: GLM: Swizzling operators disabled, #define GLM_SWIZZL
E to enable swizzle operators
 #  pragma message("GLM: Swizzling operators disabled, #define GLM_SWIZZLE to enable swizzle operators")
                                                                                                       ^
/defender/glm/glm/detail/setup.hpp:738:108: note: #pragma message: GLM: .length() returns glm::length_t, a typedef of in
t following the GLSL specification
 #  pragma message("GLM: .length() returns glm::length_t, a typedef of int following the GLSL specification")
                                                                                                            ^
/defender/glm/glm/detail/setup.hpp:739:95: note: #pragma message: GLM: #define GLM_FORCE_SIZE_T_LENGTH for .length() to
return a std::size_t
 #  pragma message("GLM: #define GLM_FORCE_SIZE_T_LENGTH for .length() to return a std::size_t")
                                                                                               ^
In file included from /defender/defender/std.h:59:0,
                 from /defender/defender/app.cpp:2:
/defender/glm/glm/glm.hpp:92:46: note: #pragma message: GLM: Core library included
 # pragma message("GLM: Core library included")
                                              ^
In file included from /defender/defender/std.h:60:0,
                 from /defender/defender/app.cpp:2:
/defender/glm/glm/ext.hpp:63:66: note: #pragma message: GLM: All extensions included (not recommanded)
 # pragma message("GLM: All extensions included (not recommanded)")
                                                                  ^
In file included from /defender/glm/glm/./gtc/ulp.hpp:89:0,
                 from /defender/glm/glm/ext.hpp:79,
                 from /defender/defender/std.h:60,
                 from /defender/defender/app.cpp:2:
/defender/glm/glm/./gtc/ulp.inl: In function 'double glm::prev_float(const double&)':
/defender/glm/glm/./gtc/ulp.inl:248:32: error: '_nextafter' was not declared in this scope
    return _nextafter(x, DBL_MIN);
                                ^
In file included from /defender/glm/glm/ext.hpp:98:0,
                 from /defender/defender/std.h:60,
                 from /defender/defender/app.cpp:2:
/defender/glm/glm/./gtx/int_10_10_10_2.hpp: At global scope:
/defender/glm/glm/./gtx/int_10_10_10_2.hpp:32:126: note: #pragma message: GLM: GLM_GTX_int_10_10_10_2 extension is depre
cated, include GLM_GTC_packing (glm/gtc/packing.hpp) instead
 # pragma message("GLM: GLM_GTX_int_10_10_10_2 extension is deprecated, include GLM_GTC_packing (glm/gtc/packing.hpp) in
stead")

      ^
In file included from /defender/defender/std.h:61:0,
                 from /defender/defender/app.cpp:2:
/defender/glm/glm/gtx/random.hpp:25:95: note: #pragma message: GLM: GLM_GTX_random extension is deprecated, include GLM_
GTC_random instead
 # pragma message("GLM: GLM_GTX_random extension is deprecated, include GLM_GTC_random instead")
                                                                                               ^
make.exe: *** [obj/local/armeabi-v7a/objs/main//defender/defender/app.o] Error 1

[blitz-research]

Ok, I had a closer look at this and have a potential fix:

Change the single instance of _nextafter in ulp.inl to detail::nextafter, and it compiles fine on Android.

I'll attempt to create a 'pull request', but I kinda suck at git - it's wanting to 'push' first for some reason...

[UnTraDe]

I tried to replace to file with the new commited one, (I have version 0.9.5.4) and it still failed to compile on android ndk. I changed every line the compiler complained about to detail::nextafter instead of _nextafter and now it compilers both on windows and android. I'm not really familiar with the usage of prev_float and next_float functions within the glm code, so I don't know what long term effect my changes might cause. If someone more knowledgeable than I do managed to solve this, please provide the solution. Thanks in advanced.

EDIT:
I uploaded the file to pastebin, http://pastebin.com/kff1Jw6L.
This currently works and compiles with both Android NDK and Windows with Visual Studio 2013.

EDIT2:
I forgot to mention my Application.mk settings.
I use the same as OP.

APP_STL := gnustl_static
NDK_TOOLCHAIN_VERSION :=4.8