Main+Meta: Allow compilation of each step without source changes

src/step0_repl.cpp

@@ -5,7 +5,6 @@
 
 #include "forward.h"
 
-#if 0
 auto read(std::string_view data) -> std::string_view
 {
 	return data;
@@ -57,5 +56,7 @@ auto eval(ValuePtr, EnvironmentPtr) -> ValuePtr
 	return {};
 }
 
+// Added to keep the linker happy at step A
+ValuePtr readline(const std::string&) { return nullptr; }
+
 } // namespace blaze
-#endif

src/step1_read_print.cpp

@@ -15,7 +15,6 @@
 #include "reader.h"
 #include "settings.h"
 
-#if 0
 namespace blaze {
 
 auto read(std::string_view input) -> ValuePtr
@@ -108,4 +107,8 @@ auto main(int argc, char* argv[]) -> int
 
 	return 0;
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step2_eval.cpp

@@ -17,7 +17,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 static blaze::EnvironmentPtr s_outer_env = blaze::Environment::create();
 
 namespace blaze {
@@ -112,4 +111,8 @@ auto main(int argc, char* argv[]) -> int
 
 	return 0;
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step3_env.cpp

@@ -17,7 +17,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 static blaze::EnvironmentPtr s_outer_env = blaze::Environment::create();
 
 namespace blaze {
@@ -112,4 +111,8 @@ auto main(int argc, char* argv[]) -> int
 
 	return 0;
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step4_if_fn_do.cpp

@@ -17,7 +17,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 static blaze::EnvironmentPtr s_outer_env = blaze::Environment::create();
 
 static auto cleanup(int signal) -> void;
@@ -129,4 +128,8 @@ static auto print(blaze::ValuePtr exp) -> std::string
 
 	return printer.print(exp, true);
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step5_tco.cpp

@@ -23,7 +23,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 static blaze::EnvironmentPtr s_outer_env = blaze::Environment::create();
 
 static auto cleanup(int signal) -> void;
@@ -135,4 +134,8 @@ static auto print(blaze::ValuePtr exp) -> std::string
 
 	return printer.print(exp, true);
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step6_file.cpp

@@ -24,7 +24,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 namespace blaze {
 
 static EnvironmentPtr s_outer_env = Environment::create();
@@ -156,4 +155,8 @@ auto main(int argc, char* argv[]) -> int
 
 	return 0;
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step7_quote.cpp

@@ -24,7 +24,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 namespace blaze {
 
 static EnvironmentPtr s_outer_env = Environment::create();
@@ -156,4 +155,8 @@ auto main(int argc, char* argv[]) -> int
 
 	return 0;
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step8_macros.cpp

@@ -24,7 +24,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 namespace blaze {
 
 static EnvironmentPtr s_outer_env = Environment::create();
@@ -163,4 +162,8 @@ auto main(int argc, char* argv[]) -> int
 
 	return 0;
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze

src/step9_try.cpp

@@ -24,7 +24,6 @@
 #include "readline.h"
 #include "settings.h"
 
-#if 0
 namespace blaze {
 
 static EnvironmentPtr s_outer_env = Environment::create();
@@ -166,4 +165,8 @@ auto main(int argc, char* argv[]) -> int
 
 	return 0;
 }
-#endif
+
+// Added to keep the linker happy at step A
+namespace blaze {
+ValuePtr readline(const std::string&) { return nullptr; }
+} // namespace blaze