Add Kotlin object inspection to simplify debugging (#763)

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/LinkStage.kt

@@ -211,6 +211,10 @@ internal class LinkStage(val context: Context) {
     private val emitted = context.bitcodeFileName
     private val libraries = context.config.libraries
 
+    private fun MutableList<String>.addNonEmpty(elements: List<String>) {
+        addAll(elements.filter { !it.isEmpty() })
+    }
+
     private fun llvmLto(files: List<BitcodeFile>): ObjectFile {
         val tmpCombined = createTempFile("combined", ".o")
         tmpCombined.deleteOnExit()
@@ -218,13 +222,13 @@ internal class LinkStage(val context: Context) {
 
         val tool = distribution.llvmLto
         val command = mutableListOf(tool, "-o", combined)
-        command.addAll(platform.llvmLtoFlags)
+        command.addNonEmpty(platform.llvmLtoFlags)
         when {
-            optimize -> command.addAll(platform.llvmLtoOptFlags)
-            debug    -> command.addAll(platform.llvmDebugOptFlags)
-            else     -> command.addAll(platform.llvmLtoNooptFlags)
+            optimize -> command.addNonEmpty(platform.llvmLtoOptFlags)
+            debug    -> command.addNonEmpty(platform.llvmDebugOptFlags)
+            else     -> command.addNonEmpty(platform.llvmLtoNooptFlags)
         }
-        command.addAll(files)
+        command.addNonEmpty(files)
         runTool(*command.toTypedArray())
 
         return combined

backend.native/konan.properties

@@ -30,7 +30,7 @@ targetToolchain.osx = clang-llvm-3.9.0-darwin-macos
 arch.osx = x86_64
 targetSysRoot.osx = target-sysroot-1-darwin-macos
 libffiDir.osx = libffi-3.2.1-2-darwin-macos
-llvmLtoFlags.osx = -exported-symbol=_Konan_main
+llvmLtoFlags.osx =
 llvmLtoOptFlags.osx = -O3 -function-sections
 llvmLtoNooptFlags.osx = -O1
 linkerKonanFlags.osx = -lc++
@@ -55,7 +55,7 @@ arch.ios = arm64
 entrySelector.ios = -alias _Konan_main _main
 targetSysRoot.ios = target-sysroot-2-darwin-ios
 libffiDir.ios = libffi-3.2.1-2-darwin-ios
-llvmLtoFlags.ios = -exported-symbol=_Konan_main
+llvmLtoFlags.ios =
 llvmLtoOptFlags.ios = -O3 -function-sections
 linkerDebugFlags.ios = -S
 llvmLtoNooptFlags.ios = -O1
@@ -76,7 +76,7 @@ arch.ios_sim = x86_64
 entrySelector.ios_sim = -alias _Konan_main _main
 targetSysRoot.ios_sim = target-sysroot-1-darwin-ios-sim
 libffiDir.ios_sim = libffi-3.2.1-2-darwin-ios-sim
-llvmLtoFlags.ios_sim = -exported-symbol=_Konan_main
+llvmLtoFlags.ios_sim =
 llvmLtoOptFlags.ios_sim = -O3 -function-sections
 llvmLtoNooptFlags.ios_sim = -O1
 linkerKonanFlags.ios_sim = -lc++
@@ -97,7 +97,7 @@ targetSysRoot.linux = target-gcc-toolchain-3-linux-x86-64/x86_64-unknown-linux-g
 libffiDir.linux = libffi-3.2.1-2-linux-x86-64
 # targetSysroot-relative.
 libGcc.linux = ../../lib/gcc/x86_64-unknown-linux-gnu/4.8.5
-llvmLtoFlags.linux = -exported-symbol=Konan_main
+llvmLtoFlags.linux =
 llvmLtoOptFlags.linux = -O3 -function-sections
 llvmLtoNooptFlags.linux = -O1
 llvmLlcFlags.linux = -march=x86-64
@@ -132,7 +132,7 @@ libffiDir.raspberrypi = libffi-3.2.1-2-raspberrypi
 linkerKonanFlags.raspberrypi = -Bstatic -lstdc++ -Bdynamic -ldl -lm -lpthread
 # targetSysroot-relative.
 libGcc.raspberrypi = lib/gcc/arm-linux-gnueabihf/4.8.3
-llvmLtoFlags.raspberrypi = -exported-symbol=Konan_main
+llvmLtoFlags.raspberrypi =
 llvmLtoOptFlags.raspberrypi = -O3 -function-sections
 llvmLtoNooptFlags.raspberrypi = -O1
 dynamicLinker.raspberrypi = /lib/ld-linux-armhf.so.3
@@ -159,7 +159,7 @@ dependencies.linux-android_arm32 = \
 
 quadruple.android_arm32 = arm-linux-androideabi
 entrySelector.android_arm32 =  -Wl,--defsym -Wl,main=Konan_main
-llvmLtoFlags.android_arm32 = -exported-symbol=Konan_main -emulated-tls -relocation-model=pic
+llvmLtoFlags.android_arm32 = -emulated-tls -relocation-model=pic
 llvmLtoOptFlags.android_arm32 = -O3 -function-sections
 linkerDebugFlags.android_arm32 = -Wl,-S
 llvmLtoNooptFlags.android_arm32 = -O1
@@ -184,7 +184,7 @@ dependencies.linux-android_arm64 = \
 
 quadruple.android_arm64 = aarch64-linux-android
 entrySelector.android_arm64 =  -Wl,--defsym -Wl,main=Konan_main
-llvmLtoFlags.android_arm64 = -exported-symbol=Konan_main -emulated-tls -relocation-model=pic
+llvmLtoFlags.android_arm64 = -emulated-tls -relocation-model=pic
 targetSysRoot.android_arm64 = target-sysroot-21-android_arm64
 libffiDir.android_arm64 = libffi-3.2.1-2-android_arm64
 linkerKonanFlags.android_arm64 = -lm -latomic -lstdc++ -landroid
@@ -198,7 +198,7 @@ targetToolchain.mingw = msys2-mingw-w64-x86_64-gcc-6.3.0-clang-llvm-3.9.1-window
 quadruple.mingw = x86_64-w64-mingw32
 targetSysRoot.mingw = msys2-mingw-w64-x86_64-gcc-6.3.0-clang-llvm-3.9.1-windows-x86-64
 libffiDir.mingw = libffi-3.2.1-mingw-w64-x86-64
-llvmLtoFlags.mingw = -exported-symbol=Konan_main
+llvmLtoFlags.mingw =
 llvmLtoOptFlags.mingw = -O3 -function-sections
 llvmLtoNooptFlags.mingw = -O1
 linkerDebugFlags.mingw = -Wl,-S
@@ -219,10 +219,11 @@ dependencies.osx-wasm32 = \
 
 quadruple.wasm32 = wasm32
 entrySelector.wasm32 =  -Wl,--defsym -Wl,main=Konan_main
-llvmLtoFlags.wasm32 = -exported-symbol=Konan_main
+llvmLtoFlags.wasm32 =
 targetSysRoot.wasm32 = target-sysroot-1-wasm
 clangFlags.wasm32 = -O1 -fno-rtti -fno-exceptions \
    -D_LIBCPP_ABI_VERSION=2 -DKONAN_NO_FFI=1 -DKONAN_NO_THREADS=1 -DKONAN_NO_EXCEPTIONS=1 \
+   -DKONAN_NO_DEBUG_API=1 \
    -nostdinc -Xclang -nobuiltininc -Xclang -nostdsysteminc \
    -Xclang -isystem<sysrootDir>/include/libcxx -Xclang -isystem<sysrootDir>/lib/libcxxabi/include \
    -Xclang -isystem<sysrootDir>/include/compat -Xclang -isystem<sysrootDir>/include/libc