https://git.ruby-lang.org/ruby.git/commit/?id=92afac8f33

From 92afac8f3346f050ff25ad15a640a6861f690427 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 22 Apr 2020 01:45:19 +0900
Subject: configure.ac: Automatically add -D__ANDROID_API=ver on Android


diff --git a/configure.ac b/configure.ac
index ba86def..e16c3e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -414,6 +414,30 @@ AC_CHECK_PROG(PKG_CONFIG, pkg-config, [pkg-config], [], [], https://github.com/ruby/ruby/blob/trunk/configure.ac#L414
 # checks for UNIX variants that set C preprocessor variables
 AC_USE_SYSTEM_EXTENSIONS
 
+AC_MSG_CHECKING([whether it is Android])
+AC_TRY_COMPILE([
+	@%:@ifdef __ANDROID__
+	@%:@error android
+	@%:@endif
+], [],
+[AC_MSG_RESULT(no)],
+[
+	AC_MSG_RESULT(yes)
+	target_os=${target_os}-android
+	AC_MSG_CHECKING([for Android API version])
+	AC_TRY_COMPILE([
+		@%:@ifndef __ANDROID_API__
+		@%:@error android
+		@%:@endif
+	], [],
+	[AC_MSG_RESULT(defined by the compiler)],
+	[
+		rb_android_api=`getprop ro.build.version.sdk`
+		AC_MSG_RESULT($rb_android_api)
+		RUBY_APPEND_OPTIONS(CPPFLAGS, -D__ANDROID_API__=$rb_android_api)
+	])
+])
+
 AC_SUBST(RM, ['rm -f'])
 AC_SUBST(CP, ['cp'])
 RMDIRS='$(top_srcdir)/tool/rmdirs'
-- 
cgit v0.10.2


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