From 67dee07edd6aa1f21a81ad261950d41beef20080 Mon Sep 17 00:00:00 2001
From: Ole Begemann <ole@oleb.net>
Date: Mon, 23 May 2022 17:36:05 +0200
Subject: [PATCH] Fix release build

Make some Swift functions public so that the linker can see them when linking CEcho.

If they're not public, release builds would fail with undefined symbols errors:

Undefined symbols for architecture arm64:
  "_lookupSection", referenced from:
      __loadImageFunc in CEcho.o
  "_registerProtocolConformances", referenced from:
      __loadImageFunc in CEcho.o
  "_registerProtocols", referenced from:
      __loadImageFunc in CEcho.o
  "_registerTypeMetadata", referenced from:
      __loadImageFunc in CEcho.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
---
 Sources/Echo/Runtime/ImageInspection.swift | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Sources/Echo/Runtime/ImageInspection.swift b/Sources/Echo/Runtime/ImageInspection.swift
index 3b7178e..e749fcf 100644
--- a/Sources/Echo/Runtime/ImageInspection.swift
+++ b/Sources/Echo/Runtime/ImageInspection.swift
@@ -56,7 +56,7 @@ let protocolLock = NSLock()
 var _protocols = Set<UnsafeRawPointer>()
 
 @_cdecl("registerProtocols")
-func registerProtocols(section: UnsafeRawPointer, size: Int) {
+public func registerProtocols(section: UnsafeRawPointer, size: Int) {
   for i in 0 ..< size / 4 {
     let start = section.offset(of: i, as: Int32.self)
     let ptr = start.relativeDirectAddress(as: _ProtocolDescriptor.self)
@@ -75,7 +75,7 @@ let conformanceLock = NSLock()
 var conformances = [UnsafeRawPointer: [ConformanceDescriptor]]()
 
 @_cdecl("registerProtocolConformances")
-func registerProtocolConformances(section: UnsafeRawPointer, size: Int) {
+public func registerProtocolConformances(section: UnsafeRawPointer, size: Int) {
   for i in 0 ..< size / 4 {
     let start = section.offset(of: i, as: Int32.self)
     let ptr = start.relativeDirectAddress(as: _ConformanceDescriptor.self)
@@ -137,7 +137,7 @@ let typeLock = NSLock()
 var _types = Set<UnsafeRawPointer>()
 
 @_cdecl("registerTypeMetadata")
-func registerTypeMetadata(section: UnsafeRawPointer, size: Int) {
+public func registerTypeMetadata(section: UnsafeRawPointer, size: Int) {
   for i in 0 ..< size / 4 {
     let start = section.offset(of: i, as: Int32.self)
     let ptr = start.relativeDirectAddress(as: _ContextDescriptor.self)
@@ -161,7 +161,7 @@ typealias mach_header_platform = mach_header
 #endif
 
 @_cdecl("lookupSection")
-func lookupSection(
+public func lookupSection(
   _ header: UnsafePointer<mach_header>?,
   segment: UnsafePointer<CChar>?,
   section: UnsafePointer<CChar>?,