go back to C++-11, as newer libprotobuf version actually require C++-17, which is too big of a jump for me. future versions will replace libprotobuf by a native protocol buffers implementation, which will fix this issue

Author: patrickbr

.github/workflows/build.yml

@@ -142,21 +142,6 @@ jobs:
         run: cd build && make
       - name: tests
         run: cd build && ctest --output-on-failure
-  macos-15-protobuf-build:
-    runs-on: macos-15
-    steps:
-      - name: Checkout repository code
-        uses: actions/checkout@v2
-      - name: Checkout submodules
-        run: git submodule update --init --recursive
-      - name: install dependencies
-        run: brew install --force --overwrite cmake && brew install --force --overwrite glpk && brew tap coin-or-tools/coinor && brew install --force --overwrite coin-or-tools/coinor/cbc && brew install protobuf
-      - name: cmake
-        run: mkdir build && cd build && cmake ..
-      - name: make
-        run: cd build && make
-      - name: tests
-        run: cd build && ctest --output-on-failure
   macos-15-intel-build:
     runs-on: macos-15-intel
     steps:
@@ -187,18 +172,3 @@ jobs:
         run: cd build && make
       - name: tests
         run: cd build && ctest --output-on-failure
-  macos-26-protobuf-build:
-    runs-on: macos-26
-    steps:
-      - name: Checkout repository code
-        uses: actions/checkout@v2
-      - name: Checkout submodules
-        run: git submodule update --init --recursive
-      - name: install dependencies
-        run: brew install --force --overwrite cmake && brew install --force --overwrite glpk && brew tap coin-or-tools/coinor && brew install --force --overwrite coin-or-tools/coinor/cbc && brew install protobuf
-      - name: cmake
-        run: mkdir build && cd build && cmake ..
-      - name: make
-        run: cd build && make
-      - name: tests
-        run: cd build && ctest --output-on-failure

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required (VERSION 3.5)
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 11)
 
 project (loom)
 

README.md

@@ -24,6 +24,8 @@ Requirements
  * `gcc >= 5.1` (or `clang >= 3.9`)
  * Optional: `libglpk-dev` (ILP solver), `coinor-libcbc-dev` (ILP solver), `gurobi` (ILP solver), `libzip-dev`, `libprotobuf-dev` + `protobuf-compiler` (for vector tile output)
 
+Note: for compilation with newest versions of `libprotobuf` (as shipped e.g. with newer versions of MacOS), you might have to change the line `set(CMAKE_CXX_STANDARD 11)` in `CMakeLists.txt` to `set(CMAKE_CXX_STANDARD 17)`. The `libprotobuf` dependency will be removed with native protocul buffer writing some time in the future, which will resolve this issue.
+
 
 Building and Installation
 -------------------------