Add sometimes needed Eigen link

Author: julien-michot

.github/workflows/build.yml

@@ -15,9 +15,10 @@ jobs:
 
       - name: Build Tinyopt-example
         run: |-
-              cmake ./ -B build -DBUILD_TINYOPT_TESTS=OFF
+              cmake ./ -B build -DTINYOPT_BUILD_TESTS=OFF
               cmake --build build -j 4
-  linux-build-apk:
+
+  linux-build-deb:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository code
@@ -37,5 +38,5 @@ jobs:
 
       - name: Build Tinyopt-example
         run: |-
-              cmake ./ -B build -DBUILD_TINYOPT_TESTS=OFF
+              cmake ./ -B build
               cmake --build build -j 4

CMakeLists.txt

@@ -7,6 +7,8 @@ project(tinyopt-example VERSION 0.0.1
 # Compiler flags
 set(CMAKE_CXX_STANDARD 20)
 
+find_package(Eigen3) # Only needed if Tinyopt is not found locally
+
 # Find Tinyopt, fetch it if not found
 find_package(Tinyopt)
 
@@ -20,10 +22,13 @@ if (NOT Tinyopt_FOUND)
       GIT_SHALLOW     TRUE
       GIT_PROGRESS    TRUE
   )
-  set(BUILD_TINYOPT_TESTS OFF)
+  set(TINYOPT_BUILD_TESTS OFF)
   FetchContent_MakeAvailable(tinyopt)
+else()
+  message("Tinyopt found at ${Tinyopt_INCLUDE_DIRS}")
 endif()
 
 # Header-only library
 add_executable(example src/example.cpp)
-target_link_libraries(example PUBLIC tinyopt)
+target_link_libraries(example PUBLIC tinyopt) # PULIC when Fetched, INTERFACE otherwise...
+target_link_libraries(example PUBLIC Eigen3::Eigen)

README.md

@@ -10,9 +10,11 @@ Minimal Tinyopt project
 set(CMAKE_CXX_STANDARD 20) # Minimum is c++17
 
 find_package(Tinyopt)
+find_package(Eigen3) # Only needed if Tinyopt is not found locally
 
 add_executable(example src/example.cpp)
 target_link_libraries(example PUBLIC tinyopt)
+target_link_libraries(example PUBLIC Eigen3::Eigen) # needed, sometimes...
 ```
 
 ### Alternative using `git submodule`