fix androideabi cross-compile error : undefined reference to 'frexpl'

src/fmt_fp.c

@@ -90,12 +90,9 @@ fmt_u(uint32_t x, char *s)
 typedef char compiler_defines_long_double_incorrectly[9-(int)sizeof(long double)];
 #endif
 
-#if (defined(__CYGWIN32__) || defined(__NetBSD__) || defined(mips)) && !defined(__linux__)
-static long double
-frexpl (long double x, int *eptr)
-{
-	return frexp(x, eptr);
-}
+#if ((defined(__CYGWIN32__) || defined(__NetBSD__) || defined(mips)) && !defined(__linux__)) || defined(__android__)
+#undef frexpl
+#define frexpl frexp
 #endif
 
 static int

tasks/toolchains/androideabi.rake

@@ -109,8 +109,8 @@ MRuby::Toolchain.new(:androideabi) do |conf|
     ANDROID_CC = path_to_toolchain + '/bin/' + toolchain_prefix + 'gcc'
     ANDROID_LD = path_to_toolchain + '/bin/' + toolchain_prefix + 'gcc'
     ANDROID_AR = path_to_toolchain + '/bin/' + toolchain_prefix + 'ar'
-    ANDROID_CFLAGS  = GCC_COMMON_CFLAGS  + %W(-mandroid --sysroot="#{SYSROOT}") + ARCH_CFLAGS
-    ANDROID_LDFLAGS = GCC_COMMON_LDFLAGS + %W(-mandroid --sysroot="#{SYSROOT}") + ARCH_LDFLAGS
+    ANDROID_CFLAGS  = GCC_COMMON_CFLAGS  + %W(-D__android__ -mandroid --sysroot="#{SYSROOT}") + ARCH_CFLAGS
+    ANDROID_LDFLAGS = GCC_COMMON_LDFLAGS + %W(-D__android__ -mandroid --sysroot="#{SYSROOT}") + ARCH_LDFLAGS
   when 'clang' then
     # clang is not supported yet.
   when 'clang31', 'clang3.1' then