switch to C17

configure.ac

@@ -40,7 +40,7 @@ dnl Check for tools
 dnl
 AC_PROG_CC
 AC_USE_SYSTEM_EXTENSIONS
-VLC_PROG_CC_C11
+VLC_PROG_CC_C17
 AH_VERBATIM([FORTIFY_SOURCE],
   [/* Enable compile-time and run-time bounds-checking, and some warnings,
    without upsetting glibc 2.15+ or toolchains predefining _FORTIFY_SOURCE */

m4/c17.m4

@@ -1,5 +1,5 @@
 # Copyright © 2015 Rémi Denis-Courmont
-# This file (c11.m4) is free software; unlimited permission to
+# This file (c17.m4) is free software; unlimited permission to
 # copy and/or distribute it , with or without modifications, as long
 # as this notice is preserved.
 
@@ -9,13 +9,13 @@
 # PARTICULAR PURPOSE.
 
 
-AC_DEFUN([VLC_PROG_CC_C11], [
+AC_DEFUN([VLC_PROG_CC_C17], [
   AC_LANG_ASSERT(C)
 
-    for opt in "" -std=gnu11 -std=c11 -c11
+    for opt in "" -std=gnu17 -std=c17 -c17
     do
-      cachevar=AS_TR_SH([ax_cv_c_compile_c11_$opt])
-      AC_CACHE_CHECK([whether $CC $opt supports C11], [$cachevar], [
+      cachevar=AS_TR_SH([ax_cv_c_compile_c17_$opt])
+      AC_CACHE_CHECK([whether $CC $opt supports C17], [$cachevar], [
         CFLAGS_save="$CFLAGS"
         CFLAGS="$CFLAGS $opt"
         dnl PREPROC is not enough due to CFLAGS usage
@@ -23,10 +23,10 @@ AC_DEFUN([VLC_PROG_CC_C11], [
 [#ifndef __STDC_VERSION__
 # error Not a C compiler!
 #endif
-#if (__STDC_VERSION__ < 201112L)
+#if (__STDC_VERSION__ < 201710L)
 # error Too old C compiler!
 #endif
-_Static_assert(1, "Not C11!");
+_Static_assert(1, "Not C17!");
 const int varname = _Generic(1, int: 1, default: 0);
 ]])], [
           eval $cachevar="yes"

meson.build

@@ -1,6 +1,6 @@
 project('VLC', ['c', 'cpp'],
     version: '4.0.0-dev',
-    default_options: ['c_std=gnu11', 'cpp_std=c++17'],
+    default_options: ['c_std=gnu17', 'cpp_std=c++17'],
     meson_version: '>=0.60.0')
 
 vlc_copyright_years = '1996-2018'