Use older GCC/G++ compiler for compatibility with MATLAB libs

Instead of trying to ship our own newer libs. I believe that was not working
because MATLAB already dynamically loads its own libs at start up, and multiple
versions of the same library cannot be loaded at the same time because that
would lead to multiple definitions of the same symbols. This means the RPATH
cannot ensure the libraries we won't will be loaded.

Actually fixes #2.

.github/workflows/build.yaml

@@ -14,6 +14,9 @@ jobs:
   build-linux:
     name: Build Linux toolbox
     runs-on: ubuntu-latest
+    env:
+      CC: gcc-10
+      CXX: g++-10
 
     steps:
       - uses: actions/checkout@v4
@@ -24,7 +27,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt update && sudo apt upgrade
-          sudo apt install cmake ninja-build gcc g++ libxml2-dev libbison-dev libfl-dev
+          sudo apt install cmake ninja-build gcc-10 g++-10 libxml2-dev libbison-dev libfl-dev
 
       - name: Set up MATLAB
         uses: matlab-actions/setup-matlab@v1

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.8] 2024-02-06
+
+### Fixed
+
+- Compile with older versions gcc/g++ on Linux to fix GLIBCXX version issue.
+
 ## [0.1.7] 2024-02-06
 
 Fake update to try to get File Exchange to change the toolbox file it grabs.

CMakeLists.txt

@@ -18,7 +18,6 @@ endif()
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(BUILD_SHARED_LIBS OFF)
 
@@ -88,11 +87,6 @@ if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
     PRE_EXCLUDE_REGEXES "api-ms-*" "libmx" "libmex" "ext-ms-*"
     DESTINATION matlab-igraph/toolbox/+igraph/private
     COMPONENT toolbox)
-elseif ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
-  install(RUNTIME_DEPENDENCY_SET toolbox_deps
-    DESTINATION matlab-igraph/toolbox/+igraph/private/lib
-    PRE_EXCLUDE_REGEXES "libmex" "libmx" "libicuuc.so.69" "libz.so.1"
-    COMPONENT toolbox)
 endif()
 
 # Packaging

flake.nix

@@ -14,25 +14,26 @@
       system = "x86_64-linux";
       pkgs = nixpkgs.legacyPackages.${system};
     in {
-      devShells.${system}.default = pkgs.mkShell {
-        buildInputs = (with nix-matlab.packages.${system}; [
-          matlab
-          matlab-mlint
-          matlab-mex
-        ]) ++ (with pkgs; [
-          astyle
-          cmake
-          ninja
-          gdb
-          hugo
-          # igraph dependencies
-          bison
-          flex
-          libxml2
-        ]);
-        shellHook = ''
-          export OMP_NUM_THREADS=16
-        '';
-      };
+      devShells.${system}.default =
+        (pkgs.mkShell.override { stdenv = pkgs.gcc10Stdenv; }) {
+          packages = (with nix-matlab.packages.${system}; [
+            matlab
+            matlab-mlint
+            matlab-mex
+          ]) ++ (with pkgs; [
+            astyle
+            cmake
+            ninja
+            gdb
+            hugo
+            # igraph dependencies
+            bison
+            flex
+            libxml2
+          ]);
+          shellHook = ''
+            export OMP_NUM_THREADS=16
+          '';
+        };
     };
 }

mex/CMakeLists.txt

@@ -8,10 +8,6 @@ foreach(source ${src_files})
     R2018a
   )
 
-  if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
-    target_link_options(${mex_name} PRIVATE LINKER:--disable-new-dtags)
-  endif()
-
   target_include_directories(${mex_name}
     PRIVATE ${Matlab_INCLUDE_DIRS} ${CMAKE_CURRENT_SOURCE_DIR}
   )

toolbox/+igraph/postinstall.m

@@ -22,11 +22,6 @@ function postinstall()
         if ~startsWith(currentSystem, 'win')
             delete(fullfile(path{1}, "*.dll"));
         end
-
-        if exist(fullfile(path{1}, 'lib'), 'dir') && ...
-             ~startsWith(currentSystem, 'gln')
-            rmdir(fullfile(path{1}, "lib"), "s");
-        end
     end
 
     self = mfilename('fullpath') + ".m";