diff --git a/.travis.yml b/.travis.yml
index 4820c0735..acf913095 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: c
 
-# Default environment: Ubuntu Trusty 14.04.
+# Default environment: Ubuntu Bionic 18.04.
 os: linux
-dist: trusty
+dist: bionic
 
 # Default job task: run tests as defined in the $OPT environment variable.
 # Jobs can redefine the 'script' stage in the matrix below.
@@ -12,13 +12,12 @@ script: tools/run-tests.py $OPTS
 matrix:
   include:
     - name: "Checks"
-      install: pip install --user pylint==1.6.5
       script:
         - tools/run-tests.py --check-signed-off=travis --check-doxygen --check-vera --check-license --check-magic-strings --check-pylint
         - travis_wait 40 tools/run-tests.py --check-cppcheck
       addons:
         apt:
-          packages: [doxygen, cppcheck, vera++]
+          packages: [doxygen, cppcheck, vera++, pylint]
 
     - name: "Linux/x86-64 Build, Correctness & Debugger Tests"
       env:
@@ -70,22 +69,20 @@ matrix:
         - OPTS="--quiet --jerry-tests --jerry-test-suite --skip-list=parser-oom.js,parser-oom2.js,stack-limit.js,regression-test-issue-2190.js,regression-test-issue-2258-2963.js,regression-test-issue-2448.js,regression-test-issue-2905.js --buildoptions=--stack-limit=0,--compile-flag=-fsanitize=address,--compile-flag=-m32,--compile-flag=-fno-omit-frame-pointer,--compile-flag=-fno-common,--compile-flag=-O2,--debug,--system-allocator=on,--linker-flag=-fuse-ld=gold"
         - ASAN_OPTIONS=detect_stack_use_after_return=1:check_initialization_order=true:strict_init_order=true
         - TIMEOUT=600
-      compiler: gcc-5
       addons:
         apt:
           sources: ubuntu-toolchain-r-test
-          packages: [gcc-5, gcc-5-multilib]
+          packages: [gcc-multilib]
 
     - name: "UBSAN Tests"
       env:
         - OPTS="--quiet --jerry-tests --jerry-test-suite --skip-list=parser-oom.js,parser-oom2.js --buildoptions=--compile-flag=-fsanitize=undefined,--compile-flag=-m32,--compile-flag=-fno-omit-frame-pointer,--compile-flag=-fno-common,--debug,--system-allocator=on,--linker-flag=-fuse-ld=gold"
         - UBSAN_OPTIONS=print_stacktrace=1
         - TIMEOUT=600
-      compiler: gcc-5
       addons:
         apt:
           sources: ubuntu-toolchain-r-test
-          packages: [gcc-5, gcc-5-multilib]
+          packages: [gcc-multilib]
 
     - name: "Coverity Scan & SonarQube"
       env:
diff --git a/docs/00.GETTING-STARTED.md b/docs/00.GETTING-STARTED.md
index d16d9b894..9ef07a4a8 100644
--- a/docs/00.GETTING-STARTED.md
+++ b/docs/00.GETTING-STARTED.md
@@ -1,6 +1,6 @@
 ## Setting up prerequisites
 
-Currently, only Ubuntu 14.04+ is officially supported as primary development environment.
+Currently, only Ubuntu 18.04+ is officially supported as primary development environment.
 
 There are several dependencies, that should be installed manually. The following list is the absolute minimum for building:
 
diff --git a/jerry-core/ecma/base/ecma-helpers-number.c b/jerry-core/ecma/base/ecma-helpers-number.c
index 8de473d65..6f48f9fee 100644
--- a/jerry-core/ecma/base/ecma-helpers-number.c
+++ b/jerry-core/ecma/base/ecma-helpers-number.c
@@ -697,7 +697,7 @@ ecma_number_parse_int (const lit_utf8_byte_t *string_buff, /**< routine's first
                                                            *   string buffer's size */
                         ecma_value_t radix) /**< routine's second argument */
 {
-  if (string_buff_size <= 0)
+  if (string_buff_size == 0)
   {
     return ecma_make_nan_value ();
   }
@@ -874,7 +874,7 @@ ecma_number_parse_float (const lit_utf8_byte_t *string_buff, /**< routine's firs
                           lit_utf8_size_t string_buff_size) /**< routine's first argument's
                                                              *   string buffer's size */
 {
-  if (string_buff_size <= 0)
+  if (string_buff_size == 0)
   {
     return ecma_make_nan_value ();
   }
diff --git a/jerry-core/ecma/base/ecma-helpers-value.c b/jerry-core/ecma/base/ecma-helpers-value.c
index 0ef1731b5..cc2354a4e 100644
--- a/jerry-core/ecma/base/ecma-helpers-value.c
+++ b/jerry-core/ecma/base/ecma-helpers-value.c
@@ -40,6 +40,7 @@ JERRY_STATIC_ASSERT (sizeof (jmem_cpointer_t) <= sizeof (jmem_cpointer_tag_t),
 
 #ifdef ECMA_VALUE_CAN_STORE_UINTPTR_VALUE_DIRECTLY
 
+/* cppcheck-suppress zerodiv */
 JERRY_STATIC_ASSERT (sizeof (uintptr_t) <= sizeof (ecma_value_t),
                      uintptr_t_must_fit_in_ecma_value_t);
 
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtins.c b/jerry-core/ecma/builtin-objects/ecma-builtins.c
index 5db3e96d4..6deb99799 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtins.c
+++ b/jerry-core/ecma/builtin-objects/ecma-builtins.c
@@ -349,6 +349,7 @@ ecma_instantiate_builtin (ecma_builtin_id_t obj_builtin_id) /**< built-in id */
 
   ecma_object_t *prototype_obj_p;
 
+  /* cppcheck-suppress arrayIndexOutOfBoundsCond */
   if (JERRY_UNLIKELY (object_prototype_builtin_id == ECMA_BUILTIN_ID__COUNT))
   {
     prototype_obj_p = NULL;
diff --git a/jerry-core/ecma/operations/ecma-function-object.c b/jerry-core/ecma/operations/ecma-function-object.c
index 7f7ccbd72..456948ea0 100644
--- a/jerry-core/ecma/operations/ecma-function-object.c
+++ b/jerry-core/ecma/operations/ecma-function-object.c
@@ -1296,7 +1296,9 @@ ecma_op_lazy_instantiate_prototype_object (ecma_object_t *object_p) /**< the fun
   }
 #endif /* ENABLED (JERRY_ES2015) */
 
+#if ENABLED (JERRY_ES2015)
   if (proto_object_p == NULL)
+#endif /* ENABLED (JERRY_ES2015) */
   {
     proto_object_p = ecma_op_create_object_object_noarg ();
   }
diff --git a/jerry-core/jmem/jmem-heap.c b/jerry-core/jmem/jmem-heap.c
index 63d331adb..0f504ea2b 100644
--- a/jerry-core/jmem/jmem-heap.c
+++ b/jerry-core/jmem/jmem-heap.c
@@ -288,6 +288,7 @@ jmem_heap_gc_and_alloc_block (const size_t size, /**< required memory size */
 
   void *data_space_p = jmem_heap_alloc (size);
 
+  /* cppcheck-suppress memleak */
   while (JERRY_UNLIKELY (data_space_p == NULL) && JERRY_LIKELY (pressure < max_pressure))
   {
     pressure++;
diff --git a/jerry-debugger/jerry_client.py b/jerry-debugger/jerry_client.py
index 4faf6d963..d1cbe28b6 100755
--- a/jerry-debugger/jerry_client.py
+++ b/jerry-debugger/jerry_client.py
@@ -252,7 +252,7 @@ def src_check_args(args):
         print("Error: Non-negative integer number expected: %s" % (val_errno))
         return -1
 
-# pylint: disable=too-many-branches,too-many-locals,too-many-statements,redefined-variable-type
+# pylint: disable=too-many-branches,too-many-locals,too-many-statements
 def main():
     args = jerry_client_main.arguments_parse()
 
diff --git a/jerry-debugger/jerry_client_main.py b/jerry-debugger/jerry_client_main.py
index 8e111013d..eeea93d21 100644
--- a/jerry-debugger/jerry_client_main.py
+++ b/jerry-debugger/jerry_client_main.py
@@ -267,7 +267,7 @@ class DebuggerAction(object):
 
 
 class JerryDebugger(object):
-    # pylint: disable=too-many-instance-attributes,too-many-statements,too-many-public-methods,no-self-use,redefined-variable-type
+    # pylint: disable=too-many-instance-attributes,too-many-statements,too-many-public-methods,no-self-use
     def __init__(self, channel):
         self.prompt = False
         self.function_list = {}
@@ -490,7 +490,7 @@ class JerryDebugger(object):
                 index = int(args)
                 if index < 0:
                     print ("Error: A non negative integer number expected")
-                    return
+                    return ""
 
             except ValueError as val_errno:
                 return "Error: Non negative integer number expected, %s\n" % (val_errno)
diff --git a/jerry-ext/handler/handler-register.c b/jerry-ext/handler/handler-register.c
index ad35d8c33..d808061f6 100644
--- a/jerry-ext/handler/handler-register.c
+++ b/jerry-ext/handler/handler-register.c
@@ -63,7 +63,13 @@ jerryx_set_properties (const jerry_value_t target_object, /**< target object */
 {
 #define JERRYX_SET_PROPERTIES_RESULT(VALUE, IDX) ((jerryx_register_result) { VALUE, IDX })
   uint32_t idx = 0;
-  for (; ((entries + idx) != NULL) && (entries[idx].name != NULL); idx++)
+
+  if (entries == NULL)
+  {
+    return JERRYX_SET_PROPERTIES_RESULT (jerry_create_undefined (), 0);
+  }
+
+  for (; (entries[idx].name != NULL); idx++)
   {
     const jerryx_property_entry *entry = &entries[idx];
 
@@ -99,9 +105,12 @@ void
 jerryx_release_property_entry (const jerryx_property_entry entries[], /**< list of property entries */
                                const jerryx_register_result register_result) /**< previous result of registration */
 {
-  for (uint32_t idx = register_result.registered;
-       ((entries + idx) != NULL) && (entries[idx].name != NULL);
-       idx++)
+  if (entries == NULL)
+  {
+    return;
+  }
+
+  for (uint32_t idx = register_result.registered; entries[idx].name != NULL; idx++)
   {
     jerry_release_value (entries[idx].value);
   }
diff --git a/jerry-libm/acos.c b/jerry-libm/acos.c
index 875d41ef5..14e6ded4b 100644
--- a/jerry-libm/acos.c
+++ b/jerry-libm/acos.c
@@ -88,7 +88,7 @@ acos (double x)
         return pi + 2.0 * pio2_lo;
       }
     }
-    return (x - x) / (x - x); /* acos(|x|>1) is NaN */
+    return NAN; /* acos(|x|>1) is NaN */
   }
   if (ix < 0x3fe00000) /* |x| < 0.5 */
   {
diff --git a/jerry-libm/asin.c b/jerry-libm/asin.c
index 1af9c3c52..2c70db522 100644
--- a/jerry-libm/asin.c
+++ b/jerry-libm/asin.c
@@ -89,7 +89,7 @@ asin (double x)
     {
       return x * pio2_hi + x * pio2_lo;
     }
-    return (x - x) / (x - x); /* asin(|x|>1) is NaN */
+    return NAN; /* asin(|x|>1) is NaN */
   }
   else if (ix < 0x3fe00000) /* |x| < 0.5 */
   {
diff --git a/jerry-libm/atan2.c b/jerry-libm/atan2.c
index 025e128f0..5f9eb1373 100644
--- a/jerry-libm/atan2.c
+++ b/jerry-libm/atan2.c
@@ -82,7 +82,7 @@ atan2 (double y, double x)
   {
     return atan (y);
   }
-  m = ((hy >> 31) & 1) | ((hx >> 30) & 2); /* 2 * sign(x) + sign(y) */
+  m = ((hy < 0) ? 1 : 0) + ((hx < 0) ? 2 : 0); /* 2 * sign(x) + sign(y) */
 
   /* when y = 0 */
   if ((iy | ly) == 0)
diff --git a/jerry-libm/exp.c b/jerry-libm/exp.c
index 8970528fc..201dd02d8 100644
--- a/jerry-libm/exp.c
+++ b/jerry-libm/exp.c
@@ -197,7 +197,7 @@ exp (double x) /* default IEEE double exp */
   }
   if (k >= -1021)
   {
-    ret.as_int.hi += (k << 20); /* add k to y's exponent */
+    ret.as_int.hi += (((unsigned int) k) << 20); /* add k to y's exponent */
     return ret.dbl;
   }
   else
diff --git a/jerry-libm/fmod.c b/jerry-libm/fmod.c
index 7a74bf3f6..0c335e450 100644
--- a/jerry-libm/fmod.c
+++ b/jerry-libm/fmod.c
@@ -53,7 +53,7 @@ fmod (double x, double y)
   if ((hy | ly) == 0 || (hx >= 0x7ff00000) || /* y = 0, or x not finite */
       ((hy | ((ly | -ly) >> 31)) > 0x7ff00000)) /* or y is NaN */
   {
-    return (x * y) / (x * y);
+    return NAN;
   }
   if (hx <= hy)
   {
@@ -123,7 +123,7 @@ fmod (double x, double y)
     n = -1022 - ix;
     if (n <= 31)
     {
-      hx = (hx << n) | (lx >> (32 - n));
+      hx = (((unsigned int) hx) << n) | (lx >> (32 - n));
       lx <<= n;
     }
     else
@@ -141,7 +141,7 @@ fmod (double x, double y)
     n = -1022 - iy;
     if (n <= 31)
     {
-      hy = (hy << n) | (ly >> (32 - n));
+      hy = (((unsigned int) hy) << n) | (ly >> (32 - n));
       ly <<= n;
     }
     else
diff --git a/jerry-libm/pow.c b/jerry-libm/pow.c
index 581876c1d..a33b9b8f7 100644
--- a/jerry-libm/pow.c
+++ b/jerry-libm/pow.c
@@ -254,12 +254,12 @@ pow (double x, double y)
     }
   }
 
-  n = (hx >> 31) + 1;
+  n = (hx < 0) ? 0 : 1;
 
   /* (x<0)**(non-int) is NaN */
   if ((n | yisint) == 0)
   {
-    return (x - x) / (x - x);
+    return NAN;
   }
 
   s = one; /* s (sign of result -ve**odd) = -1 else = 1 */
diff --git a/jerry-libm/sqrt.c b/jerry-libm/sqrt.c
index 182a76ff9..cdd548871 100644
--- a/jerry-libm/sqrt.c
+++ b/jerry-libm/sqrt.c
@@ -125,7 +125,7 @@ sqrt (double x)
     }
     else if (ix0 < 0) /* sqrt(-ve) = sNaN */
     {
-      return (x - x) / (x - x);
+      return NAN;
     }
   }
   /* normalize x */
diff --git a/jerry-main/cli.c b/jerry-main/cli.c
index 9fbc7a9c0..1f14ed867 100644
--- a/jerry-main/cli.c
+++ b/jerry-main/cli.c
@@ -112,7 +112,7 @@ cli_consume_option (cli_state_t *state_p) /**< state of the command line option
 
   state_p->arg = arg;
 
-  if (arg[0] != '-' || (arg[0] == '-' && arg[1] == '\0'))
+  if (arg[0] != '-' || arg[1] == '\0')
   {
     return CLI_OPT_DEFAULT;
   }
diff --git a/jerry-main/main-unix-snapshot.c b/jerry-main/main-unix-snapshot.c
index 244f7ee62..36c3754b0 100644
--- a/jerry-main/main-unix-snapshot.c
+++ b/jerry-main/main-unix-snapshot.c
@@ -150,7 +150,7 @@ read_file (uint8_t *input_pos_p, /**< next position in the input buffer */
     return 0;
   }
 
-  printf ("Input file '%s' (%lu bytes) loaded.\n", file_name, bytes_read);
+  printf ("Input file '%s' (%zu bytes) loaded.\n", file_name, bytes_read);
   return bytes_read;
 } /* read_file */
 
@@ -426,7 +426,7 @@ process_generate (cli_state_t *cli_state_p, /**< cli state */
   fwrite (output_buffer, sizeof (uint8_t), snapshot_size, snapshot_file_p);
   fclose (snapshot_file_p);
 
-  printf ("Created snapshot file: '%s' (%lu bytes)\n", output_file_name_p, (unsigned long) snapshot_size);
+  printf ("Created snapshot file: '%s' (%zu bytes)\n", output_file_name_p, snapshot_size);
 
   jerry_cleanup ();
   return JERRY_STANDALONE_EXIT_CODE_OK;
@@ -584,7 +584,7 @@ process_literal_dump (cli_state_t *cli_state_p, /**< cli state */
       return JERRY_STANDALONE_EXIT_CODE_FAIL;
     }
 
-    printf ("Successfully merged the input snapshots (%lu bytes).\n", merged_snapshot_size);
+    printf ("Successfully merged the input snapshots (%zu bytes).\n", merged_snapshot_size);
 
     lit_buf_sz = jerry_get_literals_from_snapshot (output_buffer,
                                                    merged_snapshot_size,
@@ -618,7 +618,7 @@ process_literal_dump (cli_state_t *cli_state_p, /**< cli state */
   fwrite (literal_buffer, sizeof (uint8_t), lit_buf_sz, file_p);
   fclose (file_p);
 
-  printf ("Literals are saved into '%s' (%lu bytes).\n", literals_file_name_p, lit_buf_sz);
+  printf ("Literals are saved into '%s' (%zu bytes).\n", literals_file_name_p, lit_buf_sz);
 
   jerry_cleanup ();
   return JERRY_STANDALONE_EXIT_CODE_OK;
@@ -752,7 +752,7 @@ process_merge (cli_state_t *cli_state_p, /**< cli state */
   fwrite (output_buffer, 1u, merged_snapshot_size, file_p);
   fclose (file_p);
 
-  printf ("Merge is completed. Merged snapshot is saved into '%s' (%lu bytes).\n",
+  printf ("Merge is completed. Merged snapshot is saved into '%s' (%zu bytes).\n",
           output_file_name_p,
           merged_snapshot_size);
 
diff --git a/jerry-main/main-unix.c b/jerry-main/main-unix.c
index 913349ea5..367f50964 100644
--- a/jerry-main/main-unix.c
+++ b/jerry-main/main-unix.c
@@ -53,6 +53,12 @@ static const uint32_t *
 read_file (const char *file_name,
            size_t *out_size_p)
 {
+  if (file_name == NULL)
+  {
+    jerry_port_log (JERRY_LOG_LEVEL_ERROR, "Error: failed to open file, missing filename\n");
+    return NULL;
+  }
+
   FILE *file;
   if (!strcmp ("-", file_name))
   {
diff --git a/tests/unit-core/test-arraybuffer.c b/tests/unit-core/test-arraybuffer.c
index c4f944aeb..403dc6186 100644
--- a/tests/unit-core/test-arraybuffer.c
+++ b/tests/unit-core/test-arraybuffer.c
@@ -304,6 +304,7 @@ main (void)
   /* Test ArrayBuffer external memory map/unmap */
   {
     const uint32_t buffer_size = 20;
+    /* cppcheck-suppress variableScope */
     JERRY_VLA (uint8_t, buffer_p, buffer_size);
     {
       jerry_value_t input_buffer = jerry_create_arraybuffer_external (buffer_size, buffer_p, NULL);
diff --git a/tests/unit-core/test-typedarray.c b/tests/unit-core/test-typedarray.c
index 31e0d145d..2b34eb51e 100644
--- a/tests/unit-core/test-typedarray.c
+++ b/tests/unit-core/test-typedarray.c
@@ -155,7 +155,7 @@ test_typedarray_queries (test_entry_t test_entries[]) /**< test cases */
  */
 static
 void test_buffer_value (uint64_t value, /**< value to test for */
-                        const uint8_t *buffer, /**< buffer to read value from */
+                        const void *buffer, /**< buffer to read value from */
                         uint32_t start_offset, /**< start offset of the value */
                         jerry_typedarray_type_t typedarray_type, /**< type of TypedArray */
                         uint32_t bytes_per_element) /**< bytes per element for the given type */
@@ -518,11 +518,11 @@ main (void)
   /* Test TypedArray operations in js */
   {
     const uint32_t element_count = 14;
-    uint8_t expected_value = 42;
 
     jerry_value_t array = jerry_create_typedarray (JERRY_TYPEDARRAY_UINT8, element_count);
 
     {
+      uint8_t expected_value = 42;
       JERRY_VLA (uint8_t, expected_data, element_count);
       memset (expected_data, expected_value, element_count);
 
diff --git a/tools/check-cppcheck.sh b/tools/check-cppcheck.sh
index 8da40d501..2f95d1ba7 100755
--- a/tools/check-cppcheck.sh
+++ b/tools/check-cppcheck.sh
@@ -40,6 +40,7 @@ cppcheck -j$CPPCHECK_JOBS --force \
   --enable=warning,style,performance,portability,information \
   --template="{file}:{line}: {severity}({id}): {message}" \
   --error-exitcode=1 \
+  --inline-suppr \
   --exitcode-suppressions=tools/cppcheck/suppressions-list \
   --suppressions-list=tools/cppcheck/suppressions-list \
   "${INCLUDE_DIRS[@]}" \
diff --git a/tools/cppcheck/suppressions-list b/tools/cppcheck/suppressions-list
index ea48aec21..d2277a83d 100644
--- a/tools/cppcheck/suppressions-list
+++ b/tools/cppcheck/suppressions-list
@@ -1,4 +1,9 @@
 wrongmathcall:tests/unit-libm/test-libm.inc.h
 variableScope:jerry-libm/*.c
 invalidPointerCast:jerry-libm/*.c
-commaSeparatedReturn:*
+
+ConfigurationNotChecked:jerry-core/ecma/builtin-objects/ecma-builtin-global.inc.h
+ConfigurationNotChecked:jerry-core/ecma/builtin-objects/ecma-builtin-helpers-macro-defines.inc.h
+ConfigurationNotChecked:jerry-core/ecma/builtin-objects/ecma-builtin-function-prototype.inc.h
+ConfigurationNotChecked:jerry-core/ecma/builtin-objects/ecma-builtin-object.inc.h
+ConfigurationNotChecked:jerry-core/ecma/builtin-objects/ecma-builtin-helpers-macro-undefs.inc.h
diff --git a/tools/run-tests.py b/tools/run-tests.py
index fedabf2c3..88605912f 100755
--- a/tools/run-tests.py
+++ b/tools/run-tests.py
@@ -301,7 +301,7 @@ def hash_binary(bin_path):
     hasher = hashlib.sha1()
     with open(bin_path, 'rb') as bin_file:
         buf = bin_file.read(blocksize)
-        while len(buf) > 0:
+        while buf:
             hasher.update(buf)
             buf = bin_file.read(blocksize)
     return hasher.hexdigest()