Native extension build error (SOLVED)

Questions
#1

Hello, I’m making a native extension but unfortunately the build server keeps returning an error as below:

Undefined symbols for architecture armv7:
  "_platform_setup", referenced from:
      __Z4initP9lua_State in lib20ca6ba8-02be-4dcb-ac22-031bca393893.a(extension_ios.cpp_1.o)

I created an iOS static library named libplatform.a and copied it to myextension/lib/ios/libplatform.a. I declared a C style function in it as below:

extern "C" void platform_setup(void*);

And called it in the native extension but I got the build error. The static library works correctly with an iOS test app in which the Objective C source calls platform_setup() by linking the static library. Am I missing something for build?

Thanks.

#2

This error happens when you bundle for iOS? For which architectures are you bundling? 32 and 64 bit arm or just one of them?

1 Like
#3

This is what I set for making iOS static library:

1
1.jpg768×177 23.8 KB

And this is the bundle settings on Defold:

2

#4

Ok, and have you verified that the library contains the correct architectures? and symbol?

E.g.

$ lipo -info tmp/dynamo_home/lib/x86_64-darwin/libdlib.a
Non-fat file: tmp/dynamo_home/lib/x86_64-darwin/libdlib.a is architecture: x86_64

$ nm tmp/dynamo_home/lib/x86_64-darwin/libdlib.a | c++filt | grep Printf
no symbols
0000000000000000 T dmSnPrintf(char*, unsigned long, char const*, ...)
                 U dmSnPrintf(char*, unsigned long, char const*, ...)
                 U dmSnPrintf(char*, unsigned long, char const*, ...)
                 U dmSnPrintf(char*, unsigned long, char const*, ...)
                 U dmSnPrintf(char*, unsigned long, char const*, ...)

(ofc, substitute with your own paths/search strings)

1 Like
#5

I didn’t try it and now I’ve got the info like this:
“Non-fat file: libplatform.a is architecture: arm64”

I wonder why it shows only arm64 even though I specified armv7 too on the Xcode build settings.
Anyway this helped a lot. Thanks.

1 Like
#6

I’ve figured out the reason why Xcode built arm64 only. iOS Deployment Target was 13.0 as the default. I’ve made it lower and then now Xcode build armv7 as well.

3 Likes