Support WINDOWS_EXPORT_ALL_SYMBOLS with `.def` files

The `WINDOWS_EXPORT_ALL_SYMBOLS` target property exports all symbols
found in object files explicitly given to the linker.  However, the
linker may also find additional symbols in dependencies and copy them
into the linked binary (e.g. from `msvcrt.lib`).  Provide a way to
export an explicit list of such symbols by adding a `.def` file as a
source file.

Fixes: #16473

1 files changed, 5 insertions, 1 deletions

diff --git a/Tests/ModuleDefinition/example_exe.c b/Tests/ModuleDefinition/example_exe.c
index dff566f..8e86fc4 100644
--- a/Tests/ModuleDefinition/example_exe.c
+++ b/Tests/ModuleDefinition/example_exe.c
@@ -3,15 +3,19 @@ extern int __declspec(dllimport) example_dll_gen_function(void);
 #ifdef EXAMPLE_DLL_2
 extern int __declspec(dllimport) example_dll_2_function(void);
 #endif
+extern int __declspec(dllimport) split_dll_1(void);
+extern int __declspec(dllimport) split_dll_2(void);
+
 int example_exe_function(void)
 {
   return 0;
 }
+
 int main(void)
 {
   return example_dll_function() + example_dll_gen_function() +
 #ifdef EXAMPLE_DLL_2
     example_dll_2_function() +
 #endif
-    example_exe_function();
+    split_dll_1() + split_dll_2() + example_exe_function();
 }