add cxx flags and use existing libs if possible

Author: bhatiaharsh

CMakeLists.txt

@@ -2,44 +2,81 @@
 cmake_minimum_required(VERSION 3.20)
 project(AdaptiveMultigridSolvers)
 
-
 set(CMAKE_VERBOSE_MAKEFILE ON)
 
 ## -----------------------------------------------------------------------------
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-set(CMAKE_CXX_FLAGS         "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS} -std=c++14 -pthread -Wno-invalid-offsetof -fPIC -Wno-deprecated")
-set(CMAKE_CXX_FLAGS_DEBUG   "${CMAKE_CXX_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS} -g")
-set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS} -Ofast -DRELEASE -funroll-loops -ffast-math")
+# set custom compiler flags
+if(CMAKE_COMPILER_IS_GNUCXX)
+    set(CFLAGS "-std=c++14 -pthread -Wno-deprecated -Wno-invalid-offsetof")
+    set(LFLAGS "-lstdc++ -lpthread")
+else()
+    set(CFLAGS, "-std=c++14 -pthread -Wno-deprecated -Wno-invalid-offsetof -Wno-dangling-else")
+    set(LFLAGS, "-lstdc++")
+endif()
 
 
-## -----------------------------------------------------------------------------
-find_package(OpenMP)
+set(CMAKE_CXX_FLAGS_DEBUG   "${CMAKE_CXX_FLAGS_DEBUG} ${CFLAGS} -g3")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${CFLAGS} -Ofast -DRELEASE -funroll-loops -ffast-math")
+set(CMAKE_EXE_LINKER_FLAGS_DEBUG   "${CMAKE_EXE_LINKER_FLAGS_DEBUG} ${LFLAGS}")
+set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} ${LFLAGS} -Ofast")
 
+## -----------------------------------------------------------------------------
+find_package(OpenMP REQUIRED)
 
 ## -----------------------------------------------------------------------------
-# all include paths
-include_directories(${PROJECT_SOURCE_DIR})
-include_directories(${PROJECT_SOURCE_DIR}/Src)
-include_directories(${PROJECT_SOURCE_DIR}/PNG)
-include_directories(${PROJECT_SOURCE_DIR}/JPEG)
-include_directories(${PROJECT_SOURCE_DIR}/ZLIB)
+find_package(PNG)        # PNG depends on zlib and adds zlib to path already
+if(PNG_FOUND)
+    #message("-- png lib found: include_dir=(${PNG_INCLUDE_DIRS}), libs=(${PNG_LIBRARIES})")
+else()
+
+    set(PNG_PATH "${PROJECT_SOURCE_DIR}/PNG")
+    message("-- png lib not found: will build from (${PNG_PATH})")
+
+    set(PNG_INCLUDE_DIRS ${PNG_PATH})
+    set(PNG_LIBRARIES    "png")  # will result in libpng
+
+    file(GLOB_RECURSE SRCS_PNG "${PNG_PATH}/*.c")
+    add_library(${PNG_LIBRARIES} SHARED ${SRCS_PNG})
+endif()
 
 ## -----------------------------------------------------------------------------
-## build dependencies as libraries
+find_package(ZLIB)      # dont really need to check for zlib if png was success
+if(ZLIB_FOUND)
+    #message("-- zlib found: include_dir=(${ZLIB_INCLUDE_DIRS}), libs=(${ZLIB_LIBRARIES})")
+else()
+    set(ZLIB_PATH "${PROJECT_SOURCE_DIR}/ZLIB")
+    message("-- zlib not found: will build from (${ZLIB_PATH})")
+
+    set(ZLIB_INCLUDE_DIRS ${ZLIB_PATH})
+    set(ZLIB_LIBRARIES    "z")  # will result in libz
+
+    file(GLOB_RECURSE SRCS_ZLIB "${ZLIB_PATH}/*.c")
+    add_library(${ZLIB_LIBRARIES} SHARED ${SRCS_ZLIB})
+endif()
+
 ## -----------------------------------------------------------------------------
-set(TRG_PNG  pr_png)
-set(TRG_JPEG pr_jpeg)
-set(TRG_ZLIB pr_zlib)
+find_package(JPEG)
+if(JPEG_FOUND)
+    #message("-- jpeg lib found: include_dir=(${JPEG_INCLUDE_DIRS}), libs=(${JPEG_LIBRARIES})")
+else()
+    set(JPEG_PATH "${PROJECT_SOURCE_DIR}/JPEG")
+    message("-- jpeg lib not found: will build from (${JPEG_PATH})")
 
-file(GLOB_RECURSE SRCS_PNG "PNG/*.c")
-file(GLOB_RECURSE SRCS_JPEG "JPEG/*.cpp")
-file(GLOB_RECURSE SRCS_ZLIB "ZLIB/*.c")
+    set(JPEG_INCLUDE_DIRS ${JPEG})
+    set(JPEG_LIBRARIES    "jpeg")  # will result in libjpeg
 
-add_library(${TRG_PNG}  STATIC ${SRCS_PNG})
-add_library(${TRG_JPEG} SHARED ${SRCS_JPEG})
-add_library(${TRG_ZLIB} SHARED ${SRCS_ZLIB})
+    file(GLOB_RECURSE SRCS_JPEG "${JPEG_PATH}/*.c")
+    add_library(${JPEG_LIBRARIES} SHARED ${SRCS_JPEG})
+endif()
+
+
+## -----------------------------------------------------------------------------
+# all include paths
+include_directories(${PROJECT_SOURCE_DIR} ${PROJECT_SOURCE_DIR}/Src)
+include_directories(${PNG_INCLUDE_DIRS} ${ZLIB_INCLUDE_DIRS} ${JPEG_INCLUDE_DIRS})
 
 
 ## -----------------------------------------------------------------------------
@@ -50,12 +87,14 @@ add_library(poisson_recon_lib SHARED
             ${PROJECT_SOURCE_DIR}/Src/PoissonReconLib.cpp)
 
 target_link_libraries(poisson_recon_lib
-                      ${TRG_PNG} ${TRG_JPEG} ${TRG_ZLIB})
+                      ${PNG_LIBRARIES} ${ZLIB_LIBRARIES} ${JPEG_LIBRARIES})
+
 
 add_executable(poisson_recon
                ${PROJECT_SOURCE_DIR}/Src/PoissonRecon.cpp)
 
 target_link_libraries(poisson_recon
-                      poisson_recon_lib ${TRG_PNG} ${TRG_JPEG} ${TRG_ZLIB})
+                      poisson_recon_lib
+                      ${PNG_LIBRARIES} ${ZLIB_LIBRARIES} ${JPEG_LIBRARIES})
 
 ## -----------------------------------------------------------------------------