Fix for OS other than Windows (Linux tested) & cmake

CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.22)
+
+project(lfmf)
+
+# when the BUILD_SHARED_LIBS is ON, CMake adds a "lfmf_EXPORTS" define automatically while compiling the library
+
+option(BUILD_SHARED_LIBS "Set to ON (default) to build SHARED libraries" ON)
+
+file(GLOB_RECURSE lfmf_source_files src/*.cpp)
+file(GLOB_RECURSE lfmf_header_files include/*.h)
+
+# lfmf will be a shared library (or not) depending on the BUILD_SHARED_LIBS variable
+
+add_library(lfmf ${lfmf_source_files} ${lfmf_header_files})
+
+# for static library, add a "_STATIC_LFMF" define while compiling
+
+target_compile_definitions(lfmf PUBLIC $<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_STATIC_LFMF>)
+
+install(FILES ${lfmf_header_files} DESTINATION include)
+install(TARGETS lfmf RUNTIME DESTINATION bin LIBRARY DESTINATION lib ARCHIVE DESTINATION lib)

include/LFMF.h

@@ -2,7 +2,15 @@
 #include <complex>
 
 // Export the DLL functions as "C" and not C++
+#if defined(WIN32) && !defined(_STATIC_LFMF)
+#ifdef lfmf_EXPORTS
 #define DLLEXPORT extern "C" __declspec(dllexport)
+#else
+#define DLLEXPORT extern "C" __declspec(dllimport)
+#endif
+#else
+#define DLLEXPORT extern "C"
+#endif
 #define MAX(x, y) (((x) > (y)) ? (x) : (y))
 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
 #define DIM(x, y) (((x) > (y)) ? (x - y) : (0))

src/Airy.cpp

@@ -1,4 +1,9 @@
-#include "..\include\LFMF.h"
+#include "../include/LFMF.h"
+
+#ifndef WIN32
+#define _copysign copysign
+#define abs fabs
+#endif
 
 /*=============================================================================
  |
@@ -815,4 +820,4 @@ complex<double> Airy(complex<double> Z, int kind, int scaling)
 
     return Ai;
 
-};
+};

src/FlatEarthCurveCorrection.cpp

@@ -1,4 +1,8 @@
-#include "..\include\LFMF.h"
+#include "../include/LFMF.h"
+
+#ifndef WIN32
+#define abs fabs
+#endif
 
 /*=============================================================================
  |

src/LFMF.cpp

@@ -1,4 +1,4 @@
-#include "..\include\LFMF.h"
+#include "../include/LFMF.h"
 
 /*=============================================================================
  |
@@ -102,4 +102,4 @@ int LFMF(double h_tx__meter, double h_rx__meter, double f__mhz, double P_tx__wat
     result->P_rx__dbm = result->E_dBuVm + G_rx__dbi - 20.0*log10(f__hz) + 42.8;
 
     return SUCCESS;
-}
+}

src/ResidueSeries.cpp

@@ -1,4 +1,8 @@
-#include "..\include\LFMF.h"
+#include "../include/LFMF.h"
+
+#ifndef WIN32
+#define abs fabs
+#endif
 
 /*=============================================================================
  |
@@ -80,4 +84,4 @@ double ResidueSeries(double d__km, double k, double h_1__km, double h_2__km, dou
 
     return E_gw;
 
-};
+};

src/ValidateInputs.cpp

@@ -1,4 +1,4 @@
-#include "..\include\LFMF.h"
+#include "../include/LFMF.h"
 
 /*=============================================================================
  |
@@ -53,4 +53,4 @@ int ValidateInput(double h_tx__meter, double h_rx__meter, double f__mhz, double
         return ERROR__POLARIZATION;
 
     return SUCCESS;
-}
+}

src/WiRoot.cpp

@@ -1,4 +1,8 @@
-#include "..\include\LFMF.h"
+#include "../include/LFMF.h"
+
+#ifndef WIN32
+#define abs fabs
+#endif
 
 /*=============================================================================
  |
@@ -238,4 +242,4 @@ complex<double> WiRoot(int i, complex<double> *DWi, complex<double> q, complex<d
     };
 
     return tw;
-};
+};

src/wofz.cpp

@@ -1,4 +1,8 @@
-#include "..\include\LFMF.h"
+#include "../include/LFMF.h"
+
+#ifndef WIN32
+#define abs fabs
+#endif
 
 complex<double> wofz(complex<double> z) 
 {