Remove jerry-libc (#2332)

Rationale:
- There is no port under targets/ that would use it. All of them
  turn it off when building.
- That's no surprise, as jerry-libc supports no barebone MCUs but
  posix targets with syscalls only. Actually, that's Linux only,
  because macOS builds have turned off the use of jerry-libc a
  while ago.
- And there is no point in maintaining a highly restricted set of
  libc functions: as soon as someone wants to use JerryScript in a
  scenario that needs more functions than jerry-main, they have to
  choose a different libc (most problably the compiler's default
  one).

I think that we should not keep supporting an otherwise unused
library for the purposes of jerry-main on arm/x86/x64-linux  only.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

targets/esp8266/Makefile.esp8266

@@ -50,7 +50,6 @@ jerry:
 	 -DCMAKE_C_COMPILER_WORKS=TRUE \
 	 -DENABLE_LTO=OFF \
 	 -DENABLE_ALL_IN_ONE=ON \
-	 -DJERRY_LIBC=OFF \
 	 -DJERRY_CMDLINE=OFF \
 	 -DEXTERNAL_COMPILE_FLAGS="$(ESP_CFLAGS)" \
 	 -DMEM_HEAP_SIZE_KB=$(JERRYHEAP)

targets/mbedos5/template-mbedignore.txt

@@ -1,6 +1,5 @@
 cmake/*
 docs/*
-jerry-libc/*
 jerry-libm/*
 jerry-main/*
 jerry-port/default/default-date.c

targets/nuttx-stm32f4/Makefile.travis

@@ -51,7 +51,7 @@ install: install-apt-get-deps install-noapt
 
 # Build JerryScript.
 script-build-jerryscript:
-	tools/build.py --clean --toolchain cmake/toolchain_mcu_stm32f4.cmake --profile=es2015-subset --jerry-cmdline OFF --jerry-libc OFF --lto OFF --jerry-libm ON --all-in-one ON --mem-heap 70 --compile-flag='--sysroot=../nuttx'
+	tools/build.py --clean --toolchain cmake/toolchain_mcu_stm32f4.cmake --profile=es2015-subset --jerry-cmdline OFF --lto OFF --jerry-libm ON --all-in-one ON --mem-heap 70 --compile-flag='--sysroot=../nuttx'
 
 # Link in the NuttX JerryScript target directory under the NuttX apps tree.
 script-add-jerryscript-app:

targets/nuttx-stm32f4/README.md

@@ -41,7 +41,6 @@ jerryscript/tools/build.py \
     --clean \
     --lto=OFF \
     --jerry-cmdline=OFF \
-    --jerry-libc=OFF \
     --jerry-libm=ON \
     --all-in-one=ON \
     --mem-heap=70 \

targets/openwrt/readme.md

@@ -87,13 +87,9 @@ Please check if the `STAGING_DIR` is configured correctly and that the toolchain
 
 ```
 $ ./tools/build.py --toolchain cmake/toolchain_openwrt_mips.cmake \
-                   --jerry-libc OFF \
                    --lto OFF
 ```
 
-Currenlty the JerryScript libc does not supports the mips platform, that's why the `--jerry-libc OFF` argument
-is passed during build.
-
 ### 2. Copy the binary
 
 After a successful build the `build/bin/jerry` binary file can be copied to the target device.

targets/particle/Makefile.particle

@@ -45,7 +45,6 @@ jerrycore:
 	 -DCMAKE_C_COMPILER_WORKS=TRUE \
 	 -DENABLE_LTO=ON \
 	 -DENABLE_ALL_IN_ONE=OFF \
-	 -DJERRY_LIBC=OFF \
 	 -DJERRY_LIBM=OFF \
 	 -DJERRY_CMDLINE=OFF \
 	 -DFEATURE_PROFILE=minimal \

targets/riot-stm32f4/Makefile.riot

@@ -35,7 +35,6 @@ libjerry:
 	 -DCMAKE_C_COMPILER_WORKS=TRUE \
 	 -DENABLE_LTO=OFF \
 	 -DENABLE_ALL_IN_ONE=OFF \
-	 -DJERRY_LIBC=OFF \
 	 -DJERRY_LIBM=OFF \
 	 -DJERRY_CMDLINE=OFF \
 	 -DEXTERNAL_COMPILE_FLAGS="$(EXT_CFLAGS)" \

targets/tizenrt-artik053/Makefile.tizenrt

@@ -25,7 +25,6 @@ libjerry:
 	cmake -B$(BUILD_DIR) -H./ \
 	 -DENABLE_LTO=OFF \
 	 -DENABLE_ALL_IN_ONE=OFF \
-	 -DJERRY_LIBC=OFF \
 	 -DJERRY_CMDLINE=OFF \
 	 -DEXTERNAL_COMPILE_FLAGS="$(EXT_CFLAGS)" \
 	 -DMEM_HEAP_SIZE_KB=$(JERRYHEAP) \

targets/tizenrt-artik053/README.md

@@ -10,7 +10,7 @@ If you are in a hurry, run following commands:
 
 ```
 $ sudo apt-add-repository -y "ppa:team-gcc-arm-embedded/ppa"
-$ sudo apt-get update 
+$ sudo apt-get update
 $ sudo apt-get install gcc-arm-embedded
 $ git clone https://github.com/jerryscript-project/jerryscript.git jerryscript
 $ cd jerryscript
@@ -87,7 +87,6 @@ jerryscript/tools/build.py \
     --clean \
     --lto=OFF \
     --jerry-cmdline=OFF \
-    --jerry-libc=OFF \
     --all-in-one=OFF \
     --mem-heap=70 \
     --profile=es2015-subset \
@@ -151,4 +150,4 @@ Without argument it prints:
 TASH>>jerry                                                                        
 No input files, running a hello world demo:                                        
 Hello World from JerryScript
-```
+```

targets/zephyr/Makefile.zephyr

@@ -83,7 +83,6 @@ endif
 	 -DCMAKE_C_COMPILER_WORKS=TRUE \
 	 -DENABLE_LTO=OFF \
 	 -DENABLE_ALL_IN_ONE=OFF \
-	 -DJERRY_LIBC=OFF \
 	 -DJERRY_CMDLINE=OFF \
 	 -DFEATURE_PROFILE=$(JERRYPROFILE) \
 	 -DFEATURE_ERROR_MESSAGES=ON \