Add support for building object files from LLVM assembly sources - close #175

build_tests/llvm/Rsconscript

@@ -0,0 +1,4 @@
+env do |env|
+  env["LLVMAS_FLAGS"] += %w[-Wno-override-module]
+  env.Program("llvmtest.exe", %w[main.c one.ll])
+end

build_tests/llvm/direct.rb

@@ -0,0 +1,8 @@
+configure do
+  check_c_compiler "clang"
+end
+
+env do |env|
+  env["LLVMAS_FLAGS"] += %w[-Wno-override-module]
+  env.Program("llvmtest.exe", %w[one.ll two.ll main2.c], direct: true)
+end

build_tests/llvm/main.c

@@ -0,0 +1,6 @@
+extern int one(void);
+
+int main(int argc, char * argv[])
+{
+    return one();
+}

build_tests/llvm/main2.c

@@ -0,0 +1,9 @@
+extern int one(void);
+extern int two(void);
+
+int main(int argc, char * argv[])
+{
+    one();
+    two();
+    return 0;
+}

build_tests/llvm/one.ll

@@ -0,0 +1,9 @@
+@str = private unnamed_addr constant [12 x i8] c"hello world\00"
+
+declare i32 @puts(ptr nocapture) nounwind
+
+define i32 @one()
+{
+    call i32 @puts(ptr @str)
+    ret i32 0
+}

build_tests/llvm/two.ll

@@ -0,0 +1,9 @@
+@str = private unnamed_addr constant [12 x i8] c"hello again\00"
+
+declare i32 @puts(ptr nocapture) nounwind
+
+define i32 @two()
+{
+    call i32 @puts(ptr @str)
+    ret i32 0
+}