Removing musl libc usage. Linking to libgcc (for __aeabi_* routines on ARM target).

src/config.h

@@ -19,11 +19,7 @@
 /**
  * Limit of data (system heap, engine's data except engine's own heap)
  */
-#ifdef LIBC_RAW
-# define CONFIG_MEM_DATA_LIMIT_MINUS_HEAP_SIZE 1024
-#else /* !LIBC_RAW */
-# define CONFIG_MEM_DATA_LIMIT_MINUS_HEAP_SIZE 16384
-#endif /* !LIBC_RAW */
+#define CONFIG_MEM_DATA_LIMIT_MINUS_HEAP_SIZE 1024
 
 /**
  * Limit of stack size

src/globals.h

@@ -31,6 +31,7 @@ typedef signed long ssize_t;
  * Attributes
  */
 #define __unused __attribute__((unused))
+#define __used __attribute__((used))
 #define __packed __attribute__((packed))
 #define __noreturn __attribute__((noreturn))
 #define __noinline __attribute__((noinline))

src/libruntime/jerry-libc.c

@@ -19,9 +19,6 @@
 
 #include "jerry-libc.h"
 
-FIXME(#ifndef LIBC_MUSL should be removed from here when own libc will be implemented)
-
-#ifndef LIBC_MUSL
 /**
  * memcpy alias to __memcpy (for compiler usage)
  */
@@ -85,7 +82,23 @@ CALL_PRAGMA(GCC pop_options)
 CALL_PRAGMA(GCC diagnostic pop)
 #endif /* __GNUC__ */
 
-#endif /* LIBC_MUSL */
+/**
+ * Unreachable stubs for routines that are never called,
+ * but referenced from third-party libraries.
+ */
+#define JRT_UNREACHABLE_STUB_FOR(...) \
+  extern __VA_ARGS__; \
+  __used __VA_ARGS__ \
+  { \
+    JERRY_UNREACHABLE (); \
+  }
+
+JRT_UNREACHABLE_STUB_FOR(int raise (int sig_no __unused))
+#ifdef __TARGET_HOST_ARMv7
+JRT_UNREACHABLE_STUB_FOR(void __aeabi_unwind_cpp_pr0 (void))
+#endif /* __TARGET_HOST_ARMv7 */
+
+#undef JRT_UNREACHABLE_STUB_FOR
 
 /**
  * memset

src/libruntime/target/linux/jerry-start.S

@@ -8,9 +8,7 @@
 # error "!__TARGET_HOST_x64 && !__TARGET_HOST_x86 && !__TARGET_HOST_ARMv7"
 #endif /* !__TARGET_HOST_x64 && !__TARGET_HOST_x86 && !__TARGET_HOST_ARMv7 */
 
-#ifdef LIBC_RAW
 .global _start
 _start:
   _START
 .end _start
-#endif /* LIBC_RAW */