我尝试将我的旧openGl代码（用c++编写）转换为c，当我尝试使用glCompileShader（）时，我总是遇到关于不兼容指针类型的奇怪警告

char *buffer = 0;
long length;
FILE *f = fopen(vertexPath, "rb");
if(f) {
    fseek(f, 0, SEEK_END);
    length = ftell(f);
    fseek(f, 0, SEEK_SET);
    buffer = malloc(length);
    if(buffer) {
        fread(buffer, 1, length, f);
    }
    fclose(f);
}
if(buffer) {
    unsigned int vertex;
    int success;
    vertex = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(vertex, 1, &buffer, NULL);
    glCompileShader(vertex);
    glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
    if(!success) {
        char *infoLog;
        infoLog = malloc(512);
        glGetShaderInfoLog(vertex, 512, NULL, infoLog);
        printf("%s%s", "Error Fragment\n", infoLog);
        free(infoLog);
    }
}

下面是我收到的警告消息：

..\src.\shader.c: In function 'compileShader':
..\src.\shader.c:29:35: warning: passing argument 3 of 'glad_glShaderSource' from 
incompatible pointer type [-Wincompatible-pointer-types]
   29 |         glShaderSource(vertex, 1, &buffer, NULL);
      |                                   ^~~~~~~
      |                                   |
      |                                   char**
..\src.\shader.c:29:35: note: expected 'const GLchar * const*' {aka 'const char * 
const*'} but argument is of type 'char**'

我不知道这个警告是什么意思，如果它是重要的，或者如果我可以忽略它。谢谢4帮助。