test: reproduce an alpine symbol issue

see sparklemotion/sqlite3-ruby#434

Author: flavorjones

test/rcd_test/ext/mri/rcd_test_ext.c

@@ -40,6 +40,19 @@ rcdt_darwin_builtin_available_eh(VALUE self)
 #endif
 }
 
+static VALUE
+rcdt_largefile_op_removed_from_musl(VALUE self)
+{
+  // Reference a symbol that was removed in Musl 1.24 🙄
+  // https://github.com/sparklemotion/sqlite3-ruby/issues/434
+#ifdef __linux__
+  posix_fallocate(STDERR_FILENO, 0, 0);
+  return Qtrue;
+#else
+  return Qfalse;
+#endif
+}
+
 void
 Init_rcd_test_ext(void)
 {
@@ -48,4 +61,5 @@ Init_rcd_test_ext(void)
   rb_define_singleton_method(rb_mRcdTest, "darwin_builtin_available?", rcdt_darwin_builtin_available_eh, 0);
   rb_define_singleton_method(rb_mRcdTest, "isinf?", rcdt_isinf_eh, 1);
   rb_define_singleton_method(rb_mRcdTest, "isnan?", rcdt_isnan_eh, 1);
+  rb_define_singleton_method(rb_mRcdTest, "largefile_op_removed_from_musl", rcdt_largefile_op_removed_from_musl, 0);
 }

test/rcd_test/ext/mri/rcd_test_ext.h

@@ -1,6 +1,11 @@
 #ifndef RCD_TEST_EXT_H
 #define RCD_TEST_EXT_H 1
 
+// see rcdt_largefile_op_removed_from_musl
+#define _LARGEFILE_SOURCE 1
+#define _FILE_OFFSET_BITS 64
+#include <fcntl.h>
+
 #include "ruby.h"
 
 #endif /* RCD_TEST_EXT_H */

test/rcd_test/test/test_basic.rb

@@ -22,10 +22,17 @@ def test_check_darwin_compiler_rt_symbol_resolution
 
   def test_floating_point_classification_macros
     skip("jruby should not run libc-specific tests") if RUBY_ENGINE == "jruby"
+
     refute(RcdTest.isinf?(42.0))
     assert(RcdTest.isinf?(Float::INFINITY))
     refute(RcdTest.isnan?(42.0))
     assert(RcdTest.isnan?(Float::NAN))
   end
 
+  def test_largefile_op_removed_from_musl
+    skip("jruby should not run libc-specific tests") if RUBY_ENGINE == "jruby"
+
+    is_linux = RUBY_PLATFORM.include?("linux")
+    assert_equal(is_linux, RcdTest.largefile_op_removed_from_musl)
+  end
 end