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

Makefile

@@ -45,10 +45,8 @@ export TARGET_RELEASE_MODES = release
 export TARGET_PC_SYSTEMS = linux
 export TARGET_MCU_SYSTEMS = $(addprefix stm32f,3 4)
 
-export TARGET_PC_MODS = musl sanitize valgrind cp cp_minimal mem_stats \
-                        musl-valgrind \
-                        valgrind-cp \
-                        musl-cp_minimal musl-mem_stats musl-cp_minimal-mem_stats \
+export TARGET_PC_MODS = sanitize valgrind cp cp_minimal mem_stats \
+                        cp-valgrind
 
 export TARGET_MCU_MODS = cp_minimal
 
@@ -87,14 +85,8 @@ all: precommit
 PRECOMMIT_CHECK_TARGETS_NO_VALGRIND_LIST= debug.linux.check \
                                           release.linux.check
 PRECOMMIT_CHECK_TARGETS_VALGRIND_LIST= debug.linux-valgrind.check \
-                                       release.linux-musl-valgrind.check \
-                                       debug.linux-valgrind-cp.check
-
-                                     # debug.linux-musl-valgrind.check \
                                        release.linux-valgrind.check \
-                                       release.linux.check \
-                                       debug.linux-sanitize.check \
-                                       release.linux-sanitize.check \
+                                       release.linux-cp-valgrind.check
 
 push: ./tools/push.sh
 	@ ./tools/push.sh

Makefile.mk

@@ -150,16 +150,6 @@ ifeq ($(OPTION_OVERRIDE_DISABLE_OPTIMIZE),enable)
   OPTION_OPTIMIZE = disable
 endif
 
-ifeq ($(filter musl,$(TARGET_MODS)), musl)
-     ifeq ($(OPTION_MCU),enable)
-      $(error MCU target doesn\'t support LIBC_MUSL)
-     endif
-
-     OPTION_LIBC := musl
-else
-     OPTION_LIBC := raw
-endif
-
 # CompactProfile mode
 ifeq ($(OPTION_MCU),enable)
      OPTION_COMPACT_PROFILE := enable
@@ -180,10 +170,6 @@ else
 endif
 
 ifeq ($(filter sanitize,$(TARGET_MODS)), sanitize)
-     ifeq ($(OPTION_LIBC),musl)
-      $(error ASAN and LIBC_MUSL are mutually exclusive)
-     endif
-
      OPTION_SANITIZE := enable
 else
      OPTION_SANITIZE := disable
@@ -249,9 +235,8 @@ CFLAGS_CORTEXM4 ?= -mlittle-endian -mcpu=cortex-m4 -march=armv7e-m -mthumb \
 # Common
 #
 
-CFLAGS_COMMON ?= $(INCLUDES) -std=c99
-
-LDFLAGS ?= 
+CFLAGS_COMMON ?= $(INCLUDES) -std=c99 -nostdlib
+LDFLAGS ?= -lgcc
 
 ifeq ($(OPTION_OPTIMIZE),enable)
  CFLAGS_COMMON += $(CFLAGS_OPTIMIZE)
@@ -341,19 +326,9 @@ INCLUDES_JERRY = \
  -I src/libcoreint \
  -I src/libintstructs
 
-# libc
-ifeq ($(OPTION_LIBC),musl)
-  CC := musl-$(CC) 
-  DEFINES_JERRY += -DLIBC_MUSL
-  CFLAGS_COMMON += -static
-else
-  DEFINES_JERRY += -DLIBC_RAW
-  CFLAGS_COMMON += -nostdlib
-
-  ifeq ($(OPTION_SANITIZE),enable)
-    CFLAGS_COMMON += -fsanitize=address
-    LDFLAGS += -lasan
-  endif
+ifeq ($(OPTION_SANITIZE),enable)
+  CFLAGS_COMMON += -fsanitize=address
+  LDFLAGS += -lasan
 endif
 
 ifeq ($(OPTION_NDEBUG),enable)

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 */