[Bug](build): missing '-shared' flag causes 'undefined symbol: main' linker error when cross-compiling

[kengoon]

OS: MacOS 26.6 (M chip)
Python: 3.14
Kivy: 3.0 (master)

when p4a starts building kivy 3.0 it fails with this error:

clang++: warning: argument unused during compilation: '-bundle' [-Wunused-command-line-argument]
clang++: warning: argument unused during compilation: '-undefined dynamic_lookup' [-Wunused-command-line-argument]
ld.lld: error: undefined symbol: main
>>> referenced by crtbegin.c
>>>               /Users/kengoon/.buildozer/android/platform/android-ndk-r28c/toolchains/llvm/prebuilt/darwin-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/24/crtbegin_dynamic.o:(_start_main)
>>> referenced by crtbegin.c
>>>               /Users/kengoon/.buildozer/android/platform/android-ndk-r28c/toolchains/llvm/prebuilt/darwin-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/24/crtbegin_dynamic.o:(_start_main)
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
 error: command '/opt/homebrew/bin/ccache' failed with exit code 1

but when I add " -shared" to LDFLAGS (this code below) it works fine:

python-for-android/pythonforandroid/recipes/kivy/__init__.py

Lines 59 to 64 in d156b3d

	# Taken from CythonRecipe
	env['LDFLAGS'] = env['LDFLAGS'] + ' -L{} '.format(
	self.ctx.get_libs_dir(arch.arch) +
	' -L{} '.format(self.ctx.libs_dir) +
	' -L{}'.format(join(self.ctx.bootstrap.build_dir, 'obj', 'local',
	arch.arch)))

I wanted to make a PR but I'm new on building with mac and I don't know whether adding -shared will break linux platform (not free to test on linux atm)

[T-Dynamos]

It's a general problem with cross compiling for Android from Mac.

Build system assumes we are building for mac and injects mac related flags. This works fine on linux as Android is effectively a linux.