cmake: set cpp17 standard

CMakeLists.txt

@@ -96,7 +96,7 @@ enable_language(C ASM)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 set(CMAKE_C_EXTENSIONS OFF)
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 

README.md

@@ -166,7 +166,7 @@ library archives (`.a`).
 
 | Dep          | Min. version  | Vendored | Debian/Ubuntu pkg    | Arch pkg     | Void pkg           | Fedora pkg          | Optional | Purpose         |
 | ------------ | ------------- | -------- | -------------------- | ------------ | ------------------ | ------------------- | -------- | --------------- |
-| GCC          | 5             | NO       | `build-essential`    | `base-devel` | `base-devel`       | `gcc`               | NO       |                 |
+| GCC          | 7             | NO       | `build-essential`    | `base-devel` | `base-devel`       | `gcc`               | NO       |                 |
 | CMake        | 3.5           | NO       | `cmake`              | `cmake`      | `cmake`            | `cmake`             | NO       |                 |
 | pkg-config   | any           | NO       | `pkg-config`         | `base-devel` | `base-devel`       | `pkgconf`           | NO       |                 |
 | Boost        | 1.58          | NO       | `libboost-all-dev`   | `boost`      | `boost-devel`      | `boost-devel`       | NO       | C++ libraries   |

contrib/depends/toolchain.cmake.in

@@ -92,7 +92,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   SET(PORT OFF)
   SET(CMAKE_OSX_SYSROOT "@prefix@/native/SDK/")
   SET(CMAKE_OSX_DEPLOYMENT_TARGET "10.13")
-  SET(CMAKE_CXX_STANDARD 14)
+  SET(CMAKE_CXX_STANDARD 17)
   SET(LLVM_ENABLE_PIC OFF)
   SET(LLVM_ENABLE_PIE OFF)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Android")