error: undefined symbol: bgfx::Init::Init()

[ghost]

I've been trying for a long time to get bgfx running, but everytime i try, i get these errors:

g++ main.cxx  -o main.exe -w -fuse-ld=lld -lglfw3 -lbgfxRelease -lbxRelease -lbimgRelease -Ibgfx/include -Ibx/include/compat/mingw -Ibx/include -Ibimg/include
ld.lld: error: undefined symbol: bgfx::Init::Init()
>>> referenced by D:\MSYS2\tmp\ccTelFz3.o:(.text)

ld.lld: error: undefined symbol: bgfx::init(bgfx::Init const&)
>>> referenced by D:\MSYS2\tmp\ccTelFz3.o:(.text)
collect2.exe: error: ld returned 1 exit status
make: *** [Makefile:9: all] Error 1

Here is my directory tree:

include/
   bgfx/
   bx/
   bimg/

Makefile
main.cxx

Makefile:

CC = g++

COMPILER_FLAGS = -o main.exe -w -fuse-ld=lld

BGFX_HEADERS =  -Ibgfx/include -Ibx/include/compat/mingw -Ibx/include -Ibimg/include
LINKER_FLAGS = -lglfw3 -lbgfxRelease -lbxRelease -lbimgRelease

all : main.cxx
	$(CC) main.cxx  $(COMPILER_FLAGS) $(LINKER_FLAGS) $(BGFX_HEADERS)

main.cxx:

#include "bgfx/bgfx.h"
#include "GLFW/glfw3.h"

#define WNDW_WIDTH 1600
#define WNDW_HEIGHT 900

int main(void)
{
    glfwInit();
    GLFWwindow* window = glfwCreateWindow(WNDW_WIDTH, WNDW_HEIGHT, "Hello, bgfx!", NULL, NULL);
    bgfx::init();
    return 0;
}

I am using MSYS2 mingw-w64, and i built bgfx with mingw-gcc-release64.

[bkaradzic]

Try with examples first, and then if you want to change build system try to understand what provided build system does.

[ghost]

I tried to build examples, here is what i got:

...
[fs_sms_mesh.sc]
[fs_sms_mesh_pd.sc]
[fs_sms_shadow.sc]
[fs_sms_shadow_pd.sc]
Target 15-shadowmaps-simple / shaders/dx11
[vs_sms_mesh.sc]
[vs_sms_shadow.sc]
[vs_sms_shadow_pd.sc]
[fs_sms_mesh.sc]
[fs_sms_mesh_pd.sc]
[fs_sms_shadow.sc]
[fs_sms_shadow_pd.sc]
Target 15-shadowmaps-simple / shaders/essl
[vs_sms_mesh.sc]
[vs_sms_shadow.sc]
[vs_sms_shadow_pd.sc]
[fs_sms_mesh.sc]
Code:
---
    386: {
    387: float ndotl = dot(_n, _ld);
    388: vec3 r = 2.0*ndotl*_n - _ld;
    389: float rdotv = dot(r, _vd);
    390: float spec = step(0.0, ndotl) * pow(max(0.0, rdotv), _exp) * (2.0 + _exp)/8.0;
    391: return max(vec2(ndotl, spec), 0.0);
    392: }
    393: float hardShadow(sampler2DShadow _sampler, vec4 _shadowCoord, float _bias)
    394: {
    395: vec3 texCoord = _shadowCoord.xyz/_shadowCoord.w;

>>> 396: return bgfxShadow2D(_sampler, vec3(texCoord.xy, texCoord.z-_bias) ).x;
>>>  19:                   ^

    397: }
    398: float PCF(sampler2DShadow _sampler, vec4 _shadowCoord, float _bias, vec2 _texelSize)
    399: {
    400: vec2 texCoord = _shadowCoord.xy/_shadowCoord.w;
    401: bool outside = any(greaterThan(texCoord, vec2_splat(1.0)))
    402: || any(lessThan (texCoord, vec2_splat(0.0)))
    403: ;
    404: if (outside)
    405: {
---
Error: (396,19): error: no matching function for call to `texture(sampler2DShadow, vec3)'; candidates are:
(396,8): error: no matching function for call to `vec4_splat(error)'; candidates are:
(396,8): error:    vec4 vec4_splat(float)
(396,8): error: type mismatch
(396,1): error: `return' with wrong type error, in function `hardShadow' returning float

Failed to build shader.
make[2]: *** [../../scripts/shader.mk:145: ../../.build/shaders/glsl/fs_sms_mesh.bin] Error 1
make[1]: *** [../../scripts/shader.mk:32: build] Error 2
make: *** [makefile:18: all] Error 2