win32 before main example

win32_before_main/build.bat

@@ -0,0 +1,15 @@
+@echo off
+
+REM: Path setup
+
+SET src=%cd%
+cd ..
+if not exist "build\" mkdir build
+cd build
+
+
+
+REM: Build
+cl /nologo /GL /O2 %src%\win32_before_main.c
+
+

win32_before_main/win32_before_main.c

@@ -0,0 +1,24 @@
+// this specific section contains before-main function pointers
+// this pragma ensures the compilation unit will generate this section
+#pragma section(".CRT$XCU", read)
+
+// declare the "before main" function
+static void run_before_main_func(void);
+
+// set the before-main execution function pointer
+__declspec(allocate(".CRT$XCU"))
+__pragma(comment(linker, "/INCLUDE:run_before_main_ptr"))
+void (*run_before_main_ptr)(void) = run_before_main_func;
+
+// define the "before main" function
+int x = 0;
+static void run_before_main_func(void){
+  x = 100;
+}
+
+// main
+#include <stdio.h>
+int main(){
+  printf("x = %d\n", x);
+  return(0);
+}

xlist/base.h

@@ -31,9 +31,11 @@
 
 # pragma section(".CRT$XCU", read)
 
-# define BEFORE_MAIN(n) extern void n(void);                   \
+# define BEFORE_MAIN(n) static  void n(void);    \
-__declspec(allocate(".CRT$XCU")) void (*n##__)(void) = n;     \
+__declspec(allocate(".CRT$XCU"))               \
-__pragma(comment(linker, "/include:" #n)) extern void n(void)
+__pragma(comment(linker, "/INCLUDE:" #n "__")) \
+void (*n##__)(void) = n;                       \
+static void n(void)
 
 #elif OS_LINUX