--- a/mesonbuild/compilers/cpp.py
+++ b/mesonbuild/compilers/cpp.py
@@ -140,8 +140,8 @@ class ClangCPPCompiler(ClangCompiler, CP
     def get_options(self):
         opts = CPPCompiler.get_options(self)
         opts.update({'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
-                                                         ['none', 'c++98', 'c++03', 'c++11', 'c++14', 'c++17', 'c++1z', 'c++2a',
-                                                          'gnu++11', 'gnu++14', 'gnu++17', 'gnu++1z', 'gnu++2a'],
+                                                         ['none', 'c++98', 'c++03', 'c++11', 'c++1y', 'c++14', 'c++17', 'c++1z', 'c++2a',
+                                                          'gnu++11', 'gnu++1y', 'gnu++14', 'gnu++17', 'gnu++1z', 'gnu++2a'],
                                                          'none')})
         return opts
 
@@ -171,8 +171,8 @@ class ArmclangCPPCompiler(ArmclangCompil
     def get_options(self):
         opts = CPPCompiler.get_options(self)
         opts.update({'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
-                                                         ['none', 'c++98', 'c++03', 'c++11', 'c++14', 'c++17',
-                                                          'gnu++98', 'gnu++03', 'gnu++11', 'gnu++14', 'gnu++17'],
+                                                         ['none', 'c++98', 'c++03', 'c++11', 'c++1y', 'c++14', 'c++17',
+                                                          'gnu++98', 'gnu++03', 'gnu++11', 'gnu++1y', 'gnu++14', 'gnu++17'],
                                                          'none')})
         return opts
 
@@ -197,10 +197,12 @@ class GnuCPPCompiler(GnuCompiler, CPPCom
                           '3': default_warn_args + ['-Wextra', '-Wpedantic']}
 
     def get_options(self):
+        cpp_stds = ['c++98', 'c++03', 'c++11', 'c++1y', 'gnu++11', 'gnu++1y']
+        if version_compare(self.version, '>=5.0.0'):
+            cpp_stds += ['c++14', 'c++17', 'c++1z', 'c++2a', 'gnu++14', 'gnu++17', 'gnu++1z', 'gnu++2a']
         opts = CPPCompiler.get_options(self)
         opts.update({'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
-                                                         ['none', 'c++98', 'c++03', 'c++11', 'c++14', 'c++17', 'c++1z', 'c++2a',
-                                                          'gnu++03', 'gnu++11', 'gnu++14', 'gnu++17', 'gnu++1z', 'gnu++2a'],
+                                                         ['none'] + cpp_stds,
                                                          'none'),
                      'cpp_debugstl': coredata.UserBooleanOption('cpp_debugstl',
                                                                 'STL debug mode',
@@ -276,7 +278,7 @@ class IntelCPPCompiler(IntelCompiler, CP
         c_stds = ['c++98', 'c++03']
         g_stds = ['gnu++98', 'gnu++03']
         if version_compare(self.version, '>=15.0.0'):
-            c_stds += ['c++11', 'c++14']
+            c_stds += ['c++11', 'c++1y', 'c++14']
             g_stds += ['gnu++11']
         if version_compare(self.version, '>=16.0.0'):
             c_stds += ['c++17']
--- a/mesonbuild/minit.py
+++ b/mesonbuild/minit.py
@@ -143,7 +143,7 @@ int main(int argc, char **argv) {{
 hello_cpp_meson_template = '''project('{project_name}', 'cpp',
   version : '{version}',
   default_options : ['warning_level=3',
-                     'cpp_std=c++14'])
+                     'cpp_std=c++1y'])
 
 exe = executable('{exe_name}', '{source_name}',
   install : true)
@@ -214,7 +214,7 @@ int main(int argc, char **argv) {{
 
 lib_cpp_meson_template = '''project('{project_name}', 'cpp',
   version : '{version}',
-  default_options : ['warning_level=3', 'cpp_std=c++14'])
+  default_options : ['warning_level=3', 'cpp_std=c++1y'])
 
 # These arguments are only used to build the shared library
 # not the executables that use the library.
@@ -404,7 +404,7 @@ def create_meson_build(options):
     default_options = ['warning_level=3']
     if options.language == 'cpp':
         # This shows how to set this very common option.
-        default_options += ['cpp_std=c++14']
+        default_options += ['cpp_std=c++1y']
     # If we get a meson.build autoformatter one day, this code could
     # be simplified quite a bit.
     formatted_default_options = ', '.join("'{}'".format(x) for x in default_options)
--- "a/test cases/common/152 simd/simdchecker.c"
+++ "b/test cases/common/152 simd/simdchecker.c"
@@ -10,11 +10,12 @@ int check_simd_implementation(float *fou
         const float *expected,
         simd_func fptr,
         const int blocksize) {
+    int i;
     int rv = 0;
     memcpy(four, four_initial, blocksize*sizeof(float));
     printf("Using %s.\n", simd_type);
     fptr(four);
-    for(int i=0; i<blocksize; i++) {
+    for(i=0; i<blocksize; i++) {
         if(four[i] != expected[i]) {
             printf("Increment function failed, got %f expected %f.\n", four[i], expected[i]);
             rv = 1;
--- "a/test cases/unit/17 prebuilt shared/patron.c"
+++ "b/test cases/unit/17 prebuilt shared/patron.c"
@@ -5,4 +5,5 @@ int main(int argc, char **argv) {
     printf("You are standing outside the Great Library of Alexandria.\n");
     printf("You decide to go inside.\n\n");
     alexandria_visit();
+    return 0;
 }