[android] Add more changes to build the compiler

Author: finagolfin

CMakeLists.txt

@@ -405,9 +405,9 @@ set(SWIFT_STDLIB_MSVC_RUNTIME_LIBRARY
 
 
 if(BRIDGING_MODE STREQUAL "DEFAULT" OR NOT BRIDGING_MODE)
-  if(CMAKE_BUILD_TYPE STREQUAL "Debug" OR "${CMAKE_SYSTEM_NAME}" STREQUAL "Windows" OR (CMAKE_Swift_COMPILER AND CMAKE_Swift_COMPILER_VERSION VERSION_LESS 5.8))
+  if(CMAKE_BUILD_TYPE STREQUAL "Debug" OR "${SWIFT_HOST_VARIANT_SDK}" MATCHES "WINDOWS|ANDROID" OR (CMAKE_Swift_COMPILER AND CMAKE_Swift_COMPILER_VERSION VERSION_LESS 5.8))
     # In debug builds, to workaround a problem with LLDB's `po` command (rdar://115770255).
-    # On windows to workaround a build problem.
+    # On Windows and Android, to workaround a build problem.
     # If the host Swift version is less than 5.8, use pure mode to workaround a C++ interop compiler crash.
     set(BRIDGING_MODE "PURE")
   else()
@@ -864,7 +864,7 @@ endif()
 
 if(SWIFT_BUILD_SWIFT_SYNTAX)
   # Only "HOSTTOOLS" is supported in Linux when Swift parser integration is enabled.
-  if(SWIFT_HOST_VARIANT_SDK MATCHES "LINUX|ANDROID|OPENBSD|FREEBSD" AND NOT BOOTSTRAPPING_MODE STREQUAL "HOSTTOOLS")
+  if(SWIFT_HOST_VARIANT_SDK MATCHES "LINUX|OPENBSD|FREEBSD" AND NOT BOOTSTRAPPING_MODE STREQUAL "HOSTTOOLS")
     message(WARNING "Force setting BOOTSTRAPPING=HOSTTOOLS because Swift parser integration is enabled")
     set(BOOTSTRAPPING_MODE "HOSTTOOLS")
   endif()
@@ -1194,6 +1194,7 @@ if(SWIFT_INCLUDE_TOOLS)
   message(STATUS "  Assertions:     ${LLVM_ENABLE_ASSERTIONS}")
   message(STATUS "  LTO:            ${SWIFT_TOOLS_ENABLE_LTO}")
   message(STATUS "  Bootstrapping:  ${BOOTSTRAPPING_MODE}")
+  message(STATUS "  C++ Bridging:   ${BRIDGING_MODE}")
   message(STATUS "  Swift parser:   ${SWIFT_BUILD_SWIFT_SYNTAX}")
   message(STATUS "")
 else()

SwiftCompilerSources/Sources/Basic/Utils.swift

@@ -54,8 +54,14 @@ public extension NoReflectionChildren {
 
 public var standardError = CFileStream(fp: stderr)
 
+#if os(Android) || canImport(Musl)
+  public typealias FILEPointer = OpaquePointer
+#else
+  public typealias FILEPointer = UnsafeMutablePointer<FILE>
+#endif
+
 public struct CFileStream: TextOutputStream {
-  var fp: UnsafeMutablePointer<FILE>
+  var fp: FILEPointer
 
   public func write(_ string: String) {
     fputs(string, fp)

cmake/modules/AddSwift.cmake

@@ -607,6 +607,9 @@ function(_add_swift_runtime_link_flags target relpath_to_lib_dir bootstrapping)
         endif()
       endif()
     endif()
+    if(SWIFT_HOST_VARIANT_SDK MATCHES "LINUX|ANDROID|OPENBSD|FREEBSD" AND SWIFT_USE_LINKER STREQUAL "lld")
+      target_link_options(${target} PRIVATE "SHELL:-Xlinker -z -Xlinker nostart-stop-gc")
+    endif()
   endif()
 
   set_property(TARGET ${target} PROPERTY BUILD_WITH_INSTALL_RPATH YES)

lib/Demangling/Errors.cpp

@@ -103,7 +103,7 @@ static void reportNow(uint32_t flags, const char *message) {
 #endif
 #if SWIFT_STDLIB_HAS_ASL
   asl_log(nullptr, nullptr, ASL_LEVEL_ERR, "%s", message);
-#elif defined(__ANDROID__)
+#elif defined(__ANDROID__) && !defined(__TERMUX__)
   __android_log_print(ANDROID_LOG_FATAL, "SwiftDemangle", "%s", message);
 #endif
 }

lib/Driver/UnixToolChains.cpp

@@ -158,10 +158,15 @@ bool toolchains::GenericUnix::addRuntimeRPath(const llvm::Triple &T,
 
   // Honour the user's request to add a rpath to the binary.  This defaults to
   // `true` on non-android and `false` on android since the library must be
-  // copied into the bundle.
+  // copied into the bundle. An exception is made for the Termux app as it
+  // builds and runs natively like a Unix environment on Android.
+#if defined(__TERMUX__)
+  bool android_rpath = true;
+#else
+  bool android_rpath = !T.isAndroid();
+#endif
   return Args.hasFlag(options::OPT_toolchain_stdlib_rpath,
-                      options::OPT_no_toolchain_stdlib_rpath,
-                      !T.isAndroid());
+                      options::OPT_no_toolchain_stdlib_rpath, android_rpath);
 }
 
 ToolChain::InvocationInfo

stdlib/public/LLVMSupport/ErrorHandling.cpp

@@ -42,7 +42,7 @@ void error(const char *prefix, const char *msg, const char *file = nullptr, unsi
 
 #if SWIFT_STDLIB_HAS_ASL
   asl_log(nullptr, nullptr, ASL_LEVEL_ERR, "%s", buffer);
-#elif defined(__ANDROID__)
+#elif defined(__ANDROID__) && !defined(__TERMUX__)
   __android_log_print(ANDROID_LOG_FATAL, "SwiftRuntime", "%s", buffer);
 #elif defined(_WIN32)
 #define STDERR_FILENO 2