From: Luke Lau <luke_lau@icloud.com>
Date: Sat, 9 Nov 2019 18:15:38 +0000 (+0000)
Subject: Add rules for statically linking the standard library in
X-Git-Url: http://git.lukelau.me/?p=kaleidoscope-hs.git;a=commitdiff_plain;h=894c2f2dcce94febb19d49af15c49b676ae78a98

Add rules for statically linking the standard library in

If statically linking in the Makefile, we need to make sure that our
putchard symbol/function doesn't get stripped out, as GHC passes the
-dead_strip flag to the linker to remove any unused functions. Since
nothing directly calls putchard in our program, it will get stripped out
unless we specify that we want to export it. We can use an export list
to indicate that we still want the symbol. (On Linux, you might need to
remove the underscore from _putchard. )
---

diff --git a/.gitignore b/.gitignore
index 699f4dd..38b1613 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 stdlib.dylib
+stdlib.o
+Main
diff --git a/Makefile b/Makefile
index 4e533dc..1a37353 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,14 @@
 stdlib.dylib: stdlib.c
 	clang -shared $< -o $@
+
+# for statically linking the stdlib:
+# make sure to change in Main.hs
+#   loadLibraryPermanently (Just "stdlib.dylib")
+# to
+#   loadLibraryPermanently Nothing
+stdlib.o: stdlib.c
+	clang -c $< -o $@
+
+Main: Main.hs stdlib.o
+	ghc $^ -o $@ -optl -Wl,-exported_symbols_list,stdlib.syms \
+		-no-keep-hi-files -no-keep-o-files
diff --git a/stdlib.syms b/stdlib.syms
new file mode 100644
index 0000000..94f22f1
--- /dev/null
+++ b/stdlib.syms
@@ -0,0 +1 @@
+_putchard