Respect features when building CMake examples

.github/ci/cmake-example-feature-smoke.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+source_dir="${GITHUB_WORKSPACE:-$(pwd)}"
+build_root="${RUNNER_TEMP:-/tmp}/gecode-example-features"
+
+rm -rf "$build_root"
+
+cmake -S "$source_dir" -B "$build_root/int" -G Ninja \
+  -DGECODE_ENABLE_EXAMPLES=ON \
+  -DGECODE_ENABLE_SET_VARS=OFF \
+  -DGECODE_ENABLE_FLOAT_VARS=OFF \
+  -DGECODE_ENABLE_FLATZINC=OFF \
+  -DGECODE_ENABLE_QT=OFF \
+  -DGECODE_ENABLE_GIST=OFF
+
+grep -q '^GECODE_ENABLE_SET_VARS:BOOL=OFF$' "$build_root/int/CMakeCache.txt"
+grep -q '^GECODE_ENABLE_FLOAT_VARS:BOOL=OFF$' "$build_root/int/CMakeCache.txt"
+cmake --build "$build_root/int" --target help > "$build_root/int-targets.txt"
+grep -q '^tsp:' "$build_root/int-targets.txt"
+! grep -q '^crew:' "$build_root/int-targets.txt"
+! grep -q '^cartesian-heart:' "$build_root/int-targets.txt"
+! grep -q '^archimedean-spiral:' "$build_root/int-targets.txt"
+cmake --build "$build_root/int" --target tsp
+
+cmake -S "$source_dir" -B "$build_root/optional" -G Ninja \
+  -DGECODE_ENABLE_EXAMPLES=ON \
+  -DGECODE_ENABLE_SET_VARS=ON \
+  -DGECODE_ENABLE_FLOAT_VARS=ON \
+  -DGECODE_ENABLE_MPFR=OFF \
+  -DGECODE_ENABLE_FLATZINC=OFF \
+  -DGECODE_ENABLE_QT=OFF \
+  -DGECODE_ENABLE_GIST=OFF
+
+cmake --build "$build_root/optional" --target help > "$build_root/optional-targets.txt"
+grep -q '^crew:' "$build_root/optional-targets.txt"
+grep -q '^cartesian-heart:' "$build_root/optional-targets.txt"
+! grep -q '^archimedean-spiral:' "$build_root/optional-targets.txt"

.github/workflows/build.yml

@@ -224,6 +224,10 @@ jobs:
       shell: bash
       run: cmake --build "$GITHUB_WORKSPACE/build-ninja"
 
+    - name: Example feature selection
+      shell: bash
+      run: bash .github/ci/cmake-example-feature-smoke.sh
+
     - name: Check
       shell: bash
       run: >

CMakeLists.txt

@@ -250,7 +250,6 @@ endif()
 if(GECODE_ENABLE_MINIMODEL)
   gecode_force_option_on(GECODE_ENABLE_SEARCH "Minimodel requires search")
   gecode_force_option_on(GECODE_ENABLE_INT_VARS "Minimodel requires int variables")
-  gecode_force_option_on(GECODE_ENABLE_SET_VARS "Minimodel requires set variables")
 endif()
 if(GECODE_ENABLE_DRIVER)
   gecode_force_option_on(GECODE_ENABLE_SEARCH "Driver requires search")
@@ -267,8 +266,6 @@ endif()
 if(GECODE_ENABLE_EXAMPLES)
   gecode_force_option_on(GECODE_ENABLE_SEARCH "Examples require search")
   gecode_force_option_on(GECODE_ENABLE_INT_VARS "Examples require int variables")
-  gecode_force_option_on(GECODE_ENABLE_SET_VARS "Examples require set variables")
-  gecode_force_option_on(GECODE_ENABLE_FLOAT_VARS "Examples require float variables")
   gecode_force_option_on(GECODE_ENABLE_MINIMODEL "Examples require minimodel")
   gecode_force_option_on(GECODE_ENABLE_DRIVER "Examples require driver")
 endif()
@@ -1271,7 +1268,10 @@ if(GECODE_ENABLE_FLOAT_VARS)
   endif()
 endif()
 if(GECODE_ENABLE_MINIMODEL)
-  set(mm_deps int set search)
+  set(mm_deps int search)
+  if(GECODE_ENABLE_SET_VARS)
+    list(APPEND mm_deps set)
+  endif()
   if(GECODE_ENABLE_FLOAT_VARS)
     list(APPEND mm_deps float)
   endif()

changelog.in

@@ -126,6 +126,15 @@ Thanks: Ioannis Papatsoris
 Treat zero entries in the TSP example as valid zero-cost edges. This lets the
 br17 instance reach its optimum.
 
+[ENTRY]
+Module: example
+What: bug
+Rank: minor
+Issue: 83
+[DESCRIPTION]
+Build CMake examples only when their required variable modules and MPFR support
+are enabled.
+
 [ENTRY]
 Module: flatzinc
 What:   new

examples/CMakeLists.txt

@@ -61,14 +61,35 @@ set(GECODE_EXAMPLE_SOURCES
   warehouses.cpp
   word-square.cpp)
 
-set(GECODE_MPFR_EXAMPLES
+set(GECODE_SET_EXAMPLES
+  crew
+  golf
+  hamming
+  queen-armies
+  steiner)
+
+set(GECODE_FLOAT_EXAMPLES
+  cartesian-heart
+  descartes-folium)
+
+set(GECODE_MPFR_FLOAT_EXAMPLES
   archimedean-spiral
   golden-spiral)
 
 function(gecode_add_example source_file)
   get_filename_component(example_name "${source_file}" NAME_WE)
 
-  if(example_name IN_LIST GECODE_MPFR_EXAMPLES AND
+  if(example_name IN_LIST GECODE_SET_EXAMPLES AND NOT GECODE_ENABLE_SET_VARS)
+    message(STATUS "Skipping example: ${example_name} (requires set variables)")
+    return()
+  endif()
+
+  if(example_name IN_LIST GECODE_FLOAT_EXAMPLES AND NOT GECODE_ENABLE_FLOAT_VARS)
+    message(STATUS "Skipping example: ${example_name} (requires float variables)")
+    return()
+  endif()
+
+  if(example_name IN_LIST GECODE_MPFR_FLOAT_EXAMPLES AND
      (NOT GECODE_ENABLE_FLOAT_VARS OR NOT GECODE_ENABLE_MPFR OR NOT MPFR_FOUND))
     message(STATUS "Skipping example: ${example_name} (requires MPFR float support)")
     return()