From 81ab0a3bbdf131dc214b3e11a26b167963252d85 Mon Sep 17 00:00:00 2001
From: Allen Webster <allenw@mr4th.com>
Date: Wed, 24 Apr 2024 06:31:59 -0700
Subject: [PATCH] win32 before main example

---
 win32_before_main/build.bat           | 15 +++++++++++++++
 win32_before_main/win32_before_main.c | 24 ++++++++++++++++++++++++
 xlist/base.h                          |  8 +++++---
 3 files changed, 44 insertions(+), 3 deletions(-)
 create mode 100644 win32_before_main/build.bat
 create mode 100644 win32_before_main/win32_before_main.c

diff --git a/win32_before_main/build.bat b/win32_before_main/build.bat
new file mode 100644
index 0000000..c64fe26
--- /dev/null
+++ b/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
+
+
diff --git a/win32_before_main/win32_before_main.c b/win32_before_main/win32_before_main.c
new file mode 100644
index 0000000..481afbd
--- /dev/null
+++ b/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);
+}
\ No newline at end of file
diff --git a/xlist/base.h b/xlist/base.h
index 801e6d2..064656c 100644
--- a/xlist/base.h
+++ b/xlist/base.h
@@ -31,9 +31,11 @@
 
 # pragma section(".CRT$XCU", read)
 
-# define BEFORE_MAIN(n) extern void n(void);                   \
-__declspec(allocate(".CRT$XCU")) void (*n##__)(void) = n;     \
-__pragma(comment(linker, "/include:" #n)) extern void n(void)
+# define BEFORE_MAIN(n) static  void n(void);    \
+__declspec(allocate(".CRT$XCU"))               \
+__pragma(comment(linker, "/INCLUDE:" #n "__")) \
+void (*n##__)(void) = n;                       \
+static void n(void)
 
 #elif OS_LINUX