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DLL Export settings in imconfig.h #7806

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DLL Export settings in imconfig.h #7806

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26 changes: 20 additions & 6 deletions imconfig.h
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Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,26 @@
//#define IM_ASSERT(_EXPR) MyAssert(_EXPR)
//#define IM_ASSERT(_EXPR) ((void)(_EXPR)) // Disable asserts

//---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
// Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
// DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
// for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
//#define IMGUI_API __declspec( dllexport )
//#define IMGUI_API __declspec( dllimport )
//---- Define the target platform. This will select the appropriate code path for your operating system.
// You can define one of the following manually:
// #define _IMGUI_WINDOWS // Use this for compiling on Windows platforms.
// #define _IMGUI_LINUX // Use this for compiling on Linux platforms.
// #define _IMGUI_MACOS // Use this for compiling on macOS platforms.
//
// Alternatively, you can use automatic detection by defining:
// #define _IMGUI_AUTO // Automatically detect the platform.
//
// Ensure that only one of these macros is defined at any time to avoid conflicts.
//#define _IMGUI_WINDOWS
//#define _IMGUI_LINUX
//#define _IMGUI_MACOS
//#define _IMGUI_AUTO

//---- Define attributes for all API symbols declarations
// Using Dear ImGui through a shared library is generally not recommended due to the overhead of function calls and the lack of guaranteed backward or forward ABI compatibility.
// If you are using a DLL, keep in mind that heaps and globals are not shared across DLL boundaries. Therefore, you need to call SetCurrentContext() and SetAllocatorFunctions()
// for each static/DLL boundary you are working across. Refer to the "Context and Memory Allocators" section in imgui.cpp for further details.
// #define _IMGUI_DLL

//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to clean your code of obsolete function/names.
//#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
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38 changes: 35 additions & 3 deletions imgui.h
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Expand Up @@ -74,12 +74,44 @@ Index of this file:
#include <stddef.h> // ptrdiff_t, NULL
#include <string.h> // memset, memmove, memcpy, strlen, strchr, strcpy, strcmp

// Define attributes of all API symbols declarations (e.g. for DLL under Windows)
// IMGUI_API is used for core imgui functions, IMGUI_IMPL_API is used for the default backends files (imgui_impl_xxx.h)
// Using dear imgui via a shared library is not recommended: we don't guarantee backward nor forward ABI compatibility + this is a call-heavy library and function call overhead adds up.
// Automatically select the ImGui platform if `_IMGUI_AUTO` is defined
#ifdef _IMGUI_AUTO
#if !defined(_IMGUI_WINDOWS) && (defined(__WIN32__) || defined(WIN32) || defined(__MINGW32__))
#define _IMGUI_WINDOWS
#elif !defined(_IMGUI_LINUX) && defined(__GNUC__)
#define _IMGUI_LINUX
#endif
#endif

// Define DLL_EXPORT to export symbols (for example, Windows DLL)
// IMGUI_API is used for core ImGui functions, IMGUI_IMPL_API is used for the default backends files (imgui_impl_xxx.h)
// Using Dear ImGui via a shared library is not recommended: we don't guarantee backward nor forward ABI compatibility and function call overhead adds up.
#ifndef IMGUI_API
#ifndef IMGUI_API
#ifdef _IMGUI_DLL
#ifdef _IMGUI_WINDOWS
#ifdef _IMGUI_DLL_EXPORT
#define IMGUI_API __declspec(dllexport)
#else
#define IMGUI_API __declspec(dllimport)
#endif
#elif defined(_IMGUI_LINUX)
#ifdef _IMGUI_DLL_EXPORT
#define IMGUI_API __attribute__((visibility("default")))
#endif
#elif defined(_IMGUI_MACOS)
#ifdef _IMGUI_DLL_EXPORT
#define IMGUI_API __attribute__((visibility("default")))
#else
#define IMGUI_API
#endif
#else
#error DLL (Shared Library) is not supported on this platform
#endif
#else
#define IMGUI_API
#endif
#endif
#ifndef IMGUI_IMPL_API
#define IMGUI_IMPL_API IMGUI_API
#endif
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