Linux: build using C++17?

platform/unix/configure.ac

@@ -26,8 +26,8 @@ includes=
 AC_DEFUN([LOVE_MSG_ERROR],
 		 [AC_MSG_ERROR([LÖVE needs "$1"[,] please install "$1" with development files and try again])])
 
-# C++14 support in cpp14.m4
-ACLOVE_CPP14_TEST
+# C++17 support in cpp14.m4
+ACLOVE_CPP17_TEST
 
 # Add -fvisibility=hidden and -fvisibility-inlines-hidden
 CFLAGS="-fvisibility=hidden $CFLAGS"

platform/unix/cpp14.m4

@@ -22,47 +22,47 @@ AC_DEFUN([ACLOVE_GET_CLANG_VERSION], [
 	AC_COMPUTE_INT(aclove_clang_version_patch, __clang_patchlevel__,, aclove_clang_version_found="no")
 ])
 
-AC_DEFUN([ACLOVE_CPP14_TEST_FLAG], [
-	aclove_cpp14_test_cxx14name="no"
-	ACLOVE_CXX_FLAG_TEST([-std=c++14], aclove_cpp14_test_cxx14name="c++14", [])
-	AS_VAR_IF([aclove_cpp14_test_cxx14name], [no],
-		[AC_MSG_ERROR([LÖVE needs a C++ compiler with C++14 support])],
-		[CXXFLAGS="$CXXFLAGS -std=$aclove_cpp14_test_cxx14name"])
+AC_DEFUN([ACLOVE_CPP17_TEST_FLAG], [
+	aclove_cpp17_test_cxx17name="no"
+	ACLOVE_CXX_FLAG_TEST([-std=c++17], aclove_cpp17_test_cxx14name="c++17", [])
+	AS_VAR_IF([aclove_cpp17_test_cxx17name], [no],
+		[AC_MSG_ERROR([LÖVE needs a C++ compiler with C++17 support])],
+		[CXXFLAGS="$CXXFLAGS -std=$aclove_cpp17_test_cxx17name"])
 ])
 
-AC_DEFUN([ACLOVE_CPP14_CHECK_VERSION], [ dnl compiler, targetmajor, targetminor, on-failure
-	aclove_cpp14_check_version_status="no"
+AC_DEFUN([ACLOVE_CPP17_CHECK_VERSION], [ dnl compiler, targetmajor, targetminor, on-failure
+	aclove_cpp17_check_version_status="no"
 	AC_MSG_CHECKING([whether $1 version is at least $2.$3])
-	AS_IF([test "$aclove_[]$1[]_version_major" -gt $2], aclove_cpp14_check_version_status="yes")
-	AS_IF([test "$aclove_[]$1[]_version_major" -eq $2 && test "$aclove_[]$1[]_version_minor" -ge $3], aclove_cpp14_check_version_status="yes")
-	AC_MSG_RESULT([$aclove_cpp14_check_version_status])
-	AS_VAR_IF([aclove_cpp14_check_version_status], [no],
+	AS_IF([test "$aclove_[]$1[]_version_major" -gt $2], aclove_cpp17_check_version_status="yes")
+	AS_IF([test "$aclove_[]$1[]_version_major" -eq $2 && test "$aclove_[]$1[]_version_minor" -ge $3], aclove_cpp17_check_version_status="yes")
+	AC_MSG_RESULT([$aclove_cpp17_check_version_status])
+	AS_VAR_IF([aclove_cpp17_check_version_status], [no],
 		[$4])
 ])
 
-AC_DEFUN([ACLOVE_CPP14_TEST_VERSION_GCC], [
-	ACLOVE_CPP14_CHECK_VERSION([gcc], 4, 9,
-		[AC_MSG_ERROR([LÖVE needs a GCC version of at least 4.9])])
+AC_DEFUN([ACLOVE_CPP17_TEST_VERSION_GCC], [
+	ACLOVE_CPP17_CHECK_VERSION([gcc], 9, 0,
+		[AC_MSG_ERROR([LÖVE needs a GCC version of at least 9.0])])
 ])
 
-AC_DEFUN([ACLOVE_CPP14_TEST_VERSION_CLANG], [
-	ACLOVE_CPP14_CHECK_VERSION([clang], 3, 4,
-		[AC_MSG_ERROR([LÖVE needs a clang version of at least 3.4])])
+AC_DEFUN([ACLOVE_CPP17_TEST_VERSION_CLANG], [
+	ACLOVE_CPP17_CHECK_VERSION([clang], 5, 0,
+		[AC_MSG_ERROR([LÖVE needs a clang version of at least 5.0])])
 ])
 
-AC_DEFUN([ACLOVE_CPP14_TEST], [
-	ACLOVE_CPP14_TEST_FLAG
+AC_DEFUN([ACLOVE_CPP17_TEST], [
+	ACLOVE_CPP17_TEST_FLAG
 
 	ACLOVE_GET_GCC_VERSION
 	ACLOVE_GET_CLANG_VERSION
 
 	# Since clang also sets gcc headers, check clang after
-	aclove_cpp14_test_compiler="unknown"
-	AS_VAR_IF([aclove_gcc_version_found], [yes], aclove_cpp14_test_compiler="gcc")
-	AS_VAR_IF([aclove_clang_version_found], [yes], aclove_cpp14_test_compiler="clang")
+	aclove_cpp17_test_compiler="unknown"
+	AS_VAR_IF([aclove_gcc_version_found], [yes], aclove_cpp17_test_compiler="gcc")
+	AS_VAR_IF([aclove_clang_version_found], [yes], aclove_cpp17_test_compiler="clang")
 
-	AS_CASE([$aclove_cpp14_test_compiler],
-		[gcc], [ACLOVE_CPP14_TEST_VERSION_GCC],
-		[clang], [ACLOVE_CPP14_TEST_VERSION_CLANG],
+	AS_CASE([$aclove_cpp17_test_compiler],
+		[gcc], [ACLOVE_CPP17_TEST_VERSION_GCC],
+		[clang], [ACLOVE_CPP17_TEST_VERSION_CLANG],
 		[AC_MSG_WARN([Could not determine compiler version])])
 ])