option to build project using cpp compiler if c not working/available

.gitignore

@@ -8,6 +8,7 @@
 *.exe
 *.dll
 *.lib
+*.dylib
 mnist/
 data/
 caffe/
@@ -31,6 +32,7 @@ build/CMakeFiles/
 build/detect_cuda_compute_capabilities.cu
 build/.ninja_deps
 build/.ninja_log
+build/Makefile
 
 # OS Generated #
 .DS_Store*

.travis.yml

@@ -44,6 +44,13 @@ matrix:
         - additional_defines=""
         - MATRIX_EVAL=""
 
+    - os: osx
+      compiler: clang
+      name: macOS - native clang - C++ mode
+      env:
+        - additional_defines="-DBUILD_AS_CPP:BOOL=TRUE"
+        - MATRIX_EVAL=""
+
     - os: osx
       compiler: clang
       name: macOS - native clang - opencv@2
@@ -179,6 +186,16 @@ matrix:
         - additional_defines=""
         - MATRIX_EVAL=""
 
+    - os: linux
+      compiler: gcc
+      name: ubuntu 14.04 - native gcc - C++ mode
+      addons:
+        apt:
+          update: true
+      env:
+        - additional_defines="-DBUILD_AS_CPP:BOOL=TRUE"
+        - MATRIX_EVAL=""
+
     - os: linux
       compiler: gcc
       name: ubuntu 14.04 - gcc@4.9
@@ -942,7 +959,6 @@ install:
   - popd
 
 before_script:
-  - echo ${additional_defines}
   - mkdir build_debug
   - cd build_debug
   - cmake .. -DCMAKE_BUILD_TYPE="Debug" ${VCPKG_DEFINES} ${additional_defines}

CMakeLists.txt

@@ -7,6 +7,7 @@ set(Darknet_VERSION ${Darknet_MAJOR_VERSION}.${Darknet_MINOR_VERSION}.${Darknet_
 
 set(CMAKE_VERBOSE_MAKEFILE "FALSE" CACHE BOOL "Create verbose makefile")
 set(BUILD_SHARED_LIBS "TRUE" CACHE BOOL "Create dark as a shared library")
+set(BUILD_AS_CPP "FALSE" CACHE BOOL "Build Darknet using C++ compiler also for C files")
 
 if(DEFINED ENV{VCPKG_ROOT} AND NOT DEFINED CMAKE_TOOLCHAIN_FILE)
   set(CMAKE_TOOLCHAIN_FILE "$ENV{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake" CACHE STRING "")
@@ -265,7 +266,9 @@ if(ENABLE_CUDA)
   file(GLOB cuda_sources "${CMAKE_CURRENT_LIST_DIR}/src/*.cu")
 endif()
 
-#set_source_files_properties(${sources} PROPERTIES LANGUAGE CXX)
+if(BUILD_AS_CPP)
+  set_source_files_properties(${sources} PROPERTIES LANGUAGE CXX)
+endif()
 
 add_library(dark ${CMAKE_CURRENT_LIST_DIR}/include/yolo_v2_class.hpp ${CMAKE_CURRENT_LIST_DIR}/src/yolo_v2_class.cpp ${sources} ${headers} ${cuda_sources})
 set_target_properties(dark PROPERTIES POSITION_INDEPENDENT_CODE ON)
@@ -275,18 +278,24 @@ endif()
 if(BUILD_SHARED_LIBS)
   target_compile_definitions(dark PRIVATE LIB_EXPORTS=1)
 endif()
-#set_target_properties(dark PROPERTIES LINKER_LANGUAGE CXX)
+if(BUILD_AS_CPP)
+  set_target_properties(dark PROPERTIES LINKER_LANGUAGE CXX)
+endif()
 
 if(OpenCV_FOUND AND OpenCV_VERSION VERSION_GREATER "3.0" AND NOT SKIP_USELIB_TRACK)
   add_executable(uselib_track ${CMAKE_CURRENT_LIST_DIR}/src/yolo_console_dll.cpp)
 endif()
 
 add_executable(uselib ${CMAKE_CURRENT_LIST_DIR}/src/yolo_console_dll.cpp)
-#set_target_properties(uselib PROPERTIES LINKER_LANGUAGE CXX)
+if(BUILD_AS_CPP)
+  set_target_properties(uselib PROPERTIES LINKER_LANGUAGE CXX)
+endif()
 
 add_executable(darknet ${CMAKE_CURRENT_LIST_DIR}/src/darknet.c ${sources} ${headers} ${cuda_sources})
-#set_source_files_properties(${CMAKE_CURRENT_LIST_DIR}/src/darknet.c PROPERTIES LANGUAGE CXX)
-#set_target_properties(darknet PROPERTIES LINKER_LANGUAGE CXX)
+if(BUILD_AS_CPP)
+  set_source_files_properties(${CMAKE_CURRENT_LIST_DIR}/src/darknet.c PROPERTIES LANGUAGE CXX)
+  set_target_properties(darknet PROPERTIES LINKER_LANGUAGE CXX)
+endif()
 
 target_include_directories(darknet PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include> $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/src> $<INSTALL_INTERFACE:${DARKNET_INSTALL_INCLUDE_DIR}> $<BUILD_INTERFACE:${Stb_INCLUDE_DIR}>)
 target_include_directories(dark PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include> $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/src> $<INSTALL_INTERFACE:${DARKNET_INSTALL_INCLUDE_DIR}> $<BUILD_INTERFACE:${Stb_INCLUDE_DIR}>)
@@ -369,7 +378,9 @@ if(OpenCV_FOUND AND OpenCV_VERSION VERSION_GREATER "3.0" AND NOT SKIP_USELIB_TRA
   target_link_libraries(uselib_track PRIVATE dark)
   target_compile_definitions(uselib_track PRIVATE TRACK_OPTFLOW=1)
   target_compile_definitions(uselib_track PRIVATE -DUSE_CMAKE_LIBS)
-  #set_target_properties(uselib_track PROPERTIES LINKER_LANGUAGE CXX)
+  if(BUILD_AS_CPP)
+    set_target_properties(uselib_track PROPERTIES LINKER_LANGUAGE CXX)
+  endif()
   target_include_directories(uselib_track PRIVATE ${CMAKE_CURRENT_LIST_DIR}/include)
   target_link_libraries(uselib_track PRIVATE ${OpenCV_LINKED_COMPONENTS})
   if(ENABLE_ZED_CAMERA)

appveyor.yml

@@ -37,6 +37,11 @@ environment:
       COMPILER: vs
       configuration: Release
       USE_INTEGRATED_LIBS: yes
+    - platform: Win64
+      COMPILER: vs
+      configuration: Release
+      USE_INTEGRATED_LIBS: yes
+      FORCE_CPP: yes
 
 install:
   - if [%COMPILER%]==[vs] cinst cmake ninja
@@ -77,7 +82,8 @@ install:
   - mkdir build_release && cd build_release
   - if [%COMPILER%]==[cygwin] %CYGSH% 'cmake .. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Release"'
   - if [%COMPILER%]==[vs] if NOT [%USE_INTEGRATED_LIBS%]==[yes] if [%configuration%]==[Release] cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" "-DCMAKE_TOOLCHAIN_FILE=%VCPKG_ROOT%\scripts\buildsystems\vcpkg.cmake" "-DVCPKG_TARGET_TRIPLET=%VCPKG_DEFAULT_TRIPLET%" -DCMAKE_BUILD_TYPE="Release" ..
-  - if [%COMPILER%]==[vs] if     [%USE_INTEGRATED_LIBS%]==[yes] cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" -DCMAKE_BUILD_TYPE="Release" ..
+  - if [%COMPILER%]==[vs] if     [%USE_INTEGRATED_LIBS%]==[yes] if [%FORCE_CPP%]==[yes]         cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" -DCMAKE_BUILD_TYPE="Release" "-DBUILD_AS_CPP:BOOL=TRUE" ..
+  - if [%COMPILER%]==[vs] if     [%USE_INTEGRATED_LIBS%]==[yes]                                 cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" -DCMAKE_BUILD_TYPE="Release" ..
   - cd ..
 
 build_script:

build.ps1

@@ -3,6 +3,7 @@
 $number_of_build_workers=8
 $use_vcpkg=$true
 $use_ninja=$false
+$force_cpp_build=$false
 
 function getProgramFiles32bit() {
   $out = ${env:PROGRAMFILES(X86)}
@@ -149,6 +150,9 @@ if (Test-Path env:CUDA_PATH) {
   }
 }
 
+if($force_cpp_build) {
+  $additional_build_setup="-DBUILD_AS_CPP:BOOL=TRUE"
+}
 
 if ($use_vcpkg) {
   ## DEBUG

build.sh

@@ -2,12 +2,9 @@
 
 number_of_build_workers=8
 bypass_vcpkg=true
+force_cpp_build=false
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
-  if [[ "$1" == "gcc" ]]; then
-    export CC="/usr/local/bin/gcc-8"
-    export CXX="/usr/local/bin/g++-8"
-  fi
   vcpkg_triplet="x64-osx"
 else
   vcpkg_triplet="x64-linux"
@@ -30,6 +27,11 @@ then
   (>&2 echo "darknet is unsupported without vcpkg, use at your own risk!")
 fi
 
+if [ "$force_cpp_build" = true ]
+then
+  additional_build_setup="-DBUILD_AS_CPP:BOOL=TRUE"
+fi
+
 ## DEBUG
 #mkdir -p build_debug
 #cd build_debug

src/col2im.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <math.h>
+#include <string.h>
 #include "col2im.h"
 void col2im_add_pixel(float *im, int height, int width, int channels,
                         int row, int col, int channel, int pad, float val)

src/data.c

@@ -937,7 +937,7 @@ data load_data_detection(int n, char **paths, int m, int w, int h, int c, int bo
             {
                 image tmp_ai = copy_image(ai);
                 char buff[1000];
-                sprintf(buff, "aug_%d_%d_%s_%d", random_index, i, basecfg(filename), random_gen());
+                sprintf(buff, "aug_%d_%d_%s_%d", random_index, i, basecfg((char*)filename), random_gen());
                 int t;
                 for (t = 0; t < boxes; ++t) {
                     box b = float_to_box_stride(d.y.vals[i] + t*(4 + 1), 1);

src/gemm.c

@@ -1120,8 +1120,10 @@ void convolution_2d(int w, int h, int ksize, int n, int c, int pad, int stride,
 
 static inline int popcnt128(__m128i n) {
     const __m128i n_hi = _mm_unpackhi_epi64(n, n);
-#ifdef _MSC_VER
+#if defined(_MSC_VER)
     return __popcnt64(_mm_cvtsi128_si64(n)) + __popcnt64(_mm_cvtsi128_si64(n_hi));
+#elif defined(__APPLE__) && defined(__clang__)
+    return _mm_popcnt_u64(_mm_cvtsi128_si64(n)) + _mm_popcnt_u64(_mm_cvtsi128_si64(n_hi));
 #else
     return __popcntq(_mm_cvtsi128_si64(n)) + __popcntq(_mm_cvtsi128_si64(n_hi));
 #endif

src/parser.c

@@ -167,7 +167,7 @@ convolutional_layer parse_convolutional(list *options, size_params params, netwo
 
     int share_index = option_find_int_quiet(options, "share_index", -1);
     convolutional_layer *share_layer = NULL;
-    if(share_layer > -1) share_layer = &net.layers[share_index];
+    if((long long int)share_layer > -1) share_layer = &net.layers[share_index];
 
     int batch,h,w,c;
     h = params.h;