Bump minimum CMake version to 3.11

Red Hat Enterprise Linux (RHEL) 7 has reached its end of life in 2024.
This means we can bump the minimum required version to 3.11 which is
provided in RHEL 8 [1]. We assume that other systems either have CMake
3.11 or newer available, or have a way to install a sufficently new
CMake versions.

Bumping the minimum version removes some deprecation warning (about
support for older CMake versions being dropped), and also ensures
compatibility with CMake 4.0 which has dropped support for CMake <3.5
and was rolled out to GitHub runners recently.

[1]: https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/8.0_release_notes/index#platform-tools

Author: ajaust

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.11)
 project(segyio LANGUAGES C CXX)
 
 include(CheckFunctionExists)

README.md

@@ -97,7 +97,7 @@ A copy of segyio is available both as pre-built binaries and source code:
 To build segyio you need:
  * A C99 compatible C compiler (tested mostly on gcc and clang)
  * A C++ compiler for the Python extension, and C++11 for the tests
- * [CMake](https://cmake.org/) version 2.8.12 or greater
+ * [CMake](https://cmake.org/) version 3.11 or greater
  * [Python](https://www.python.org/) 3.9 or greater
  * [numpy](http://www.numpy.org/) version 1.10 or greater
  * [setuptools](https://pypi.python.org/pypi/setuptools) version 28 or greater

external/catch2/CMakeLists.txt

@@ -1,12 +1,5 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.11)
 project(catch2 CXX)
 
-# Dummy source file added because INTERFACE type
-# library is not available in CMake 2.8.12
-# it's STATIC, because MSVC would otherwise not generate a .lib file, making
-# "linking" (for header path) fail later
-#
-# TODO: when cmake minimum version is bumped to 3.x series, replace with
-# an INTERFACE library
-add_library(catch2 STATIC dummy.cpp)
-target_include_directories(catch2 SYSTEM PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+add_library(catch2 INTERFACE)
+target_include_directories(catch2 SYSTEM INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})

external/catch2/dummy.cpp

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.11)
 project(libsegyio C CXX)
 
 set(SEGYIO_LIB_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH "")

lib/CMakeLists.txt

@@ -7,7 +7,7 @@ if (SKBUILD)
     return ()
 endif ()
 
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.11)
 project(segyio-python)
 
 if (REQUIRE_PYTHON)

python/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5.0)
+cmake_minimum_required(VERSION 3.11)
 project(segyio-python-extension LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 11)