msvc c++ build failing to compile

[Skytrias]

hey ive been looking into ui's and your library looks pretty nice. However im getting weird link errors and error: LNK2019 unresolved symbol ""void __cdecl mu_init(struct mu_Context *)" or when i inserted extern "C" myself in your files i got it to "mu_init" being unresolved.

my build.bat uses these libs gdi32.lib opengl32.lib winmm.lib

just wondering if anyone usese windows with msvc c++ here and got this figured out

[AregevDev]

Have the same issue, not sure how to fix it...

[inkydragon]

1. initial empty vs2019 project
2. set /SUBSYSTEM:WINDOWS flag
3. add _CRT_SECURE_NO_WARNINGS flag
4. put everything in the root folder of your project, or you may Configure Include Directories to include src and demo folder.
5. use NuGet add SDL2 and nupengl.core (windows already has opengl) Or you may add those dependences by hand like: How do I link SDL with Visual Studio 2019 - Stack Overflow
6. change include: In main.c: #include <SDL2/SDL.h> => #include "SDL.h" In renderer.c:
   • #include <SDL2/SDL.h> => #include "SDL.h";
   • #include <SDL2/SDL_opengl.h> => #include "SDL_opengl.h"
7. add opengl32.lib to Additional Dependencies
8. build and run!

[gvanem]

just wondering if anyone usese windows with msvc c++ here and got this figured out

You probably compiled your project as C++. Look, there's no:

#ifdef __cplusplus
extern "C" {
#endif

inside microui.h

[immortalx74]

I tried @inkydragon 's suggestion but no luck. I'm not using VS, just invoking the compiler from a developer command prompt. Any ideas?

[gvanem]

Your project is C++, right? Apply this simple patch:

--- a/src/microui.h 2021-10-09 12:10:12
+++ b/src/microui.h 2021-10-09 12:14:10
@@ -8,6 +8,10 @@
 #ifndef MICROUI_H
 #define MICROUI_H

+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define MU_VERSION "2.01"

 #define MU_COMMANDLIST_SIZE     (256 * 1024)
@@ -293,4 +297,8 @@
 void mu_begin_panel_ex(mu_Context *ctx, const char *name, int opt);
 void mu_end_panel(mu_Context *ctx);

+#ifdef __cplusplus
+};
+#endif
+
 #endif

[immortalx74]

@gvanem I don't have a "project" as I'm not actually using Visual Studio. I invoke the compiler from the command line, and the default behavior with .c extensions is to compile as C. Even if I force C compilation with /Tc or /TC compiler flags, I always get the error:

LINK : fatal error LNK1561: entry point must be defined

I also tried with your fix and forcing C++ compilation, in which case I get several C4576 errors.

[g012]

You don’t have a main / winmain function.

Le sam. 9 oct. 2021 à 16:54, immortalx74 @.***> a écrit :

@gvanem https://github.com/gvanem I don't have a "project" as I'm not actually using Visual Studio. I invoke the compiler from the command line, and the default behavior with .c extensions is to compile as C. Even if I force C compilation with /Tc or /TC compiler flags, I always get the error:

LINK : fatal error LNK1561: entry point must be defined

I also tried with your fix and forcing C++ compilation, in which case I get several C4576 errors.

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[immortalx74]

Problem fixed. I was only compiling main.c and microui.c. I assumed that renderer.c was included in main.c