Build LibC and Userland with clang as well.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/4914f3b8378

AK/kmalloc.cpp

@@ -46,6 +46,36 @@ void* kmalloc_eternal(size_t size)
 
 }
 
+void* operator new(size_t size)
+{
+    return kmalloc(size);
+}
+
+void* operator new[](size_t size)
+{
+    return kmalloc(size);
+}
+
+void operator delete(void* ptr)
+{
+    return kfree(ptr);
+}
+
+void operator delete[](void* ptr)
+{
+    return kfree(ptr);
+}
+
+void operator delete(void* ptr, size_t)
+{
+    return kfree(ptr);
+}
+
+void operator delete[](void* ptr, size_t)
+{
+    return kfree(ptr);
+}
+
 #else
 
 extern "C" {

AK/kmalloc.h

@@ -27,36 +27,6 @@ void* kmalloc_eternal(size_t) MALLOC_ATTR;
 
 }
 
-inline void* operator new(size_t size)
-{
-    return kmalloc(size);
-}
-
-inline void* operator new[](size_t size)
-{
-    return kmalloc(size);
-}
-
-inline void operator delete(void* ptr)
-{
-    return kfree(ptr);
-}
-
-inline void operator delete[](void* ptr)
-{
-    return kfree(ptr);
-}
-
-inline void operator delete(void* ptr, size_t)
-{
-    return kfree(ptr);
-}
-
-inline void operator delete[](void* ptr, size_t)
-{
-    return kfree(ptr);
-}
-
 inline void* operator new(size_t, void* p) { return p; }
 inline void* operator new[](size_t, void* p) { return p; }
 #endif

LibC/Makefile

@@ -34,14 +34,14 @@ ARCH_FLAGS =
 STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
 LIBC_FLAGS = -ffreestanding -fno-stack-protector -fno-ident
 WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
-FLAVOR_FLAGS = -fomit-frame-pointer -mregparm=3 -march=i386 -m32 -fno-exceptions -fno-rtti -ffunction-sections -fdata-sections -fmerge-all-constants -fno-unroll-loops -falign-functions=1 -falign-jumps=1 -falign-loops=1 -fno-pie -fno-pic
-OPTIMIZATION_FLAGS = -Os -fno-asynchronous-unwind-tables
+FLAVOR_FLAGS = -fomit-frame-pointer -mregparm=3 -march=i386 -m32 -fno-exceptions -fno-rtti -ffunction-sections -fdata-sections -fmerge-all-constants -fno-unroll-loops -fno-pie -fno-pic
+OPTIMIZATION_FLAGS = -Oz -fno-asynchronous-unwind-tables
 INCLUDE_FLAGS = -I.. -I.
 
 DEFINES = -DSERENITY -DUSERLAND -DSANITIZE_PTRS
 
 CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(LIBC_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = g++-8
+CXX = clang
 LD = ld
 AR = ar
 LDFLAGS = -T linker.ld --strip-debug -melf_i386 --gc-sections --build-id=none -z norelro -z now

LibC/sys/cdefs.h

@@ -16,3 +16,6 @@
 
 #undef __P
 #define __P(a) a
+
+extern "C" int main(int, char**);
+

Userland/Makefile

@@ -45,13 +45,13 @@ STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
 USERLAND_FLAGS = -ffreestanding -fno-stack-protector -fno-ident
 WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
 FLAVOR_FLAGS = -march=i386 -mregparm=3 -m32 -fno-exceptions -fno-rtti -fmerge-all-constants -fno-unroll-loops -fno-pie -fno-pic
-OPTIMIZATION_FLAGS = -Os -fno-asynchronous-unwind-tables
+OPTIMIZATION_FLAGS = -Oz -fno-asynchronous-unwind-tables
 INCLUDE_FLAGS = -I.. -I. -I../LibC
 
 DEFINES = -DSERENITY -DSANITIZE_PTRS -DUSERLAND
 
 CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(USERLAND_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = g++-8
+CXX = clang
 LD = ld
 AR = ar
 LDFLAGS = -static --strip-debug -melf_i386 --build-id=none -z norelro -z now -e _start --gc-sections

Userland/false.cpp

@@ -1,4 +1,6 @@
-int main()
+#include <sys/cdefs.h>
+
+int main(int, char**)
 {
     return 1;
 }

Userland/id.cpp

@@ -4,6 +4,8 @@
 #include <grp.h>
 #include <alloca.h>
 
+extern "C" int main(int, char**);
+
 int main(int argc, char** argv)
 {
     (void) argc;

Userland/true.cpp

@@ -1,4 +1,6 @@
-int main()
+#include <sys/cdefs.h>
+
+int main(int, char**)
 {
     return 0;
 }