extconf.rb in d_heap-0.7.0

- old
+ new
@@ -6,17 +6,48 @@
 # $CFLAGS << " -D__D_HEAP_DEBUG" if /darwin/ =~ RUBY_PLATFORM
 # $CFLAGS << " -debug inline-debug-info "
 # $CFLAGS << " -g -ginline-points "
 # $CFLAGS << " -fno-omit-frame-pointer "
 
-if enable_config("debug")
-  CONFIG["warnflags"] << " -Werror -Wpedantic "
+# Use `rake compile -- --enable-debug`
+debug_mode = enable_config("debug", ENV["EXTCONF_DEBUG"] == "1")
+
+# Use `rake compile -- --enable-development`
+devel_mode = enable_config("development") || debug_mode
+
+if debug_mode
+  $stderr.puts "Building in debug mode." # rubocop:disable Style/StderrPuts
+  CONFIG["warnflags"] \
+    << " -ggdb" \
+    << " -DDEBUG"
 end
 
+if devel_mode
+  $stderr.puts "Building in development mode." # rubocop:disable Style/StderrPuts
+  CONFIG["warnflags"] \
+    << " -Wall " \
+    << " -Wpedantic" \
+  # There are warnings on MacOS that are annoying to debug (I don't have a Mac).
+  unless RbConfig::CONFIG["target_os"] =~ /darwin/
+    CONFIG["warnflags"] << " -Werror"
+  end
+end
+
+# Use `rake compile -- --enable-heapmap`
+if enable_config("heapmap", true)
+  $stderr.puts "Building with DHeap::Map support." # rubocop:disable Style/StderrPuts
+  $defs.push "-DDHEAP_MAP"
+end
+
 have_func "rb_gc_mark_movable" # since ruby-2.7
 
 check_sizeof("long")
 check_sizeof("unsigned long long")
 check_sizeof("long double")
-have_macro("LDBL_MANT_DIG", "float.h")
+check_sizeof("double")
 
+unless have_macro("LDBL_MANT_DIG", "float.h")
+  raise NotImplementedError, "Missing LDBL_MANT_DIG."
+end
+
+create_header
 create_makefile("d_heap/d_heap")