[embedded] Add a dependency test to show that embedded print() is free of allocations/retains/releases

Author: kubamracek

test/embedded/dependencies-print.swift

@@ -0,0 +1,33 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -enable-experimental-feature Embedded -no-allocations %s -c -o %t/a.o
+
+// RUN: grep DEP\: %s | sed 's#// DEP\: ##' | sort > %t/allowed-dependencies.txt
+
+// Linux/ELF doesn't use the "_" prefix in symbol mangling.
+// RUN: if [ %target-os == "linux-gnu" ]; then sed -E -i -e 's/^_(.*)$/\1/' %t/allowed-dependencies.txt; fi
+
+// RUN: %llvm-nm --undefined-only --format=just-symbols %t/a.o | sort | tee %t/actual-dependencies.txt
+
+// Fail if there is any entry in actual-dependencies.txt that's not in allowed-dependencies.txt
+// RUN: test -z "`comm -13 %t/allowed-dependencies.txt %t/actual-dependencies.txt`"
+
+// DEP: ___stack_chk_fail
+// DEP: ___stack_chk_guard
+// DEP: ___divti3
+// DEP: ___modti3
+// DEP: _memset
+// DEP: _putchar
+
+// RUN: %target-clang -x c -c %S/Inputs/print.c -o %t/print.o
+// RUN: %target-clang %t/a.o %t/print.o -o %t/a.out
+// RUN: %target-run %t/a.out | %FileCheck %s
+
+// REQUIRES: swift_in_compiler
+// REQUIRES: executable_test
+// REQUIRES: optimized_stdlib
+// REQUIRES: OS=macosx || OS=linux-gnu
+// UNSUPPORTED: OS=linux-gnu && CPU=aarch64
+
+print("Hello Embedded Swift!") // CHECK: Hello Embedded Swift!
+print(42) // CHECK: 42
+print(false) // CHECK: false