Conditional compilation

pkgs/ruby/ext/default/extconf.rb

@@ -2,9 +2,9 @@
 
 require 'mkmf'
 
-have_library 'kernaux'
+raise 'libkernaux not found' unless have_library 'kernaux'
 
 have_func 'kernaux_utoa10'
 have_func 'kernaux_itoa10'
 
-create_makefile 'kernaux/default'
+raise 'can\'t create Makefile' unless create_makefile 'kernaux/default'

pkgs/ruby/ext/default/main.c

@@ -5,16 +5,25 @@
 
 static VALUE rb_KernAux = Qnil;
 
+#ifdef HAVE_KERNAUX_UTOA10
 static VALUE rb_KernAux_utoa10(VALUE self, VALUE number);
+#endif
+#ifdef HAVE_KERNAUX_ITOA10
 static VALUE rb_KernAux_itoa10(VALUE self, VALUE number);
+#endif
 
 void Init_default()
 {
     rb_KernAux = rb_define_module("KernAux");
+#ifdef HAVE_KERNAUX_UTOA10
     rb_define_singleton_method(rb_KernAux, "utoa10", rb_KernAux_utoa10, 1);
+#endif
+#ifdef HAVE_KERNAUX_ITOA10
     rb_define_singleton_method(rb_KernAux, "itoa10", rb_KernAux_itoa10, 1);
+#endif
 }
 
+#ifdef HAVE_KERNAUX_UTOA10
 VALUE rb_KernAux_utoa10(
     const VALUE self_rb __attribute__((unused)),
     const VALUE number_rb
@@ -27,7 +36,9 @@ VALUE rb_KernAux_utoa10(
     kernaux_utoa10(NUM2ULL(number_rb), buffer);
     return rb_funcall(rb_str_new2(buffer), rb_intern("freeze"), 0);
 }
+#endif
 
+#ifdef HAVE_KERNAUX_ITOA10
 VALUE rb_KernAux_itoa10(
     const VALUE self_rb __attribute__((unused)),
     const VALUE number_rb
@@ -37,3 +48,4 @@ VALUE rb_KernAux_itoa10(
     kernaux_itoa10(NUM2LL(number_rb), buffer);
     return rb_funcall(rb_str_new2(buffer), rb_intern("freeze"), 0);
 }
+#endif

pkgs/ruby/spec/lib/kernaux_spec.rb

@@ -9,6 +9,7 @@ RSpec.describe KernAux do
     end
   end
 
+  if described_class.singleton_class.method_defined? :utoa10
     describe '.utoa10' do
       subject(:utoa10) { described_class.utoa10 number }
 
@@ -48,7 +49,9 @@ RSpec.describe KernAux do
         end
       end
     end
+  end
 
+  if described_class.singleton_class.method_defined? :itoa10
     describe '.itoa10' do
       subject(:itoa10) { described_class.itoa10 number }
 
@@ -92,8 +95,8 @@ RSpec.describe KernAux do
         let(:number) { -2**63 - 1 }
 
         specify do
-        expect { itoa10 }.to \
-          raise_error RangeError, 'bignum too big to convert into `long long\''
+          expect { itoa10 }.to raise_error \
+            RangeError, 'bignum too big to convert into `long long\''
         end
       end
 
@@ -101,8 +104,9 @@ RSpec.describe KernAux do
         let(:number) { 2**63 }
 
         specify do
-        expect { itoa10 }.to \
-          raise_error RangeError, 'bignum too big to convert into `long long\''
+          expect { itoa10 }.to raise_error \
+            RangeError, 'bignum too big to convert into `long long\''
+        end
       end
     end
   end

src/console.c

@@ -17,12 +17,14 @@
 
 #include <stddef.h>
 
+#ifdef WITH_PRINTF
 static void kernaux_console_printf_putc(
     const char c,
     void *const arg __attribute__((unused))
 ) {
     kernaux_console_putc(c);
 }
+#endif
 
 void kernaux_console_putc(const char c __attribute__((unused)))
 {