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compiler: fix and simplify DllMainCRTStartup handling

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See: https://github.com/llvm/llvm-project/pull/171680
This commit is contained in:
Alex Rønne Petersen
2026-01-19 23:09:56 +01:00
parent a8e624d7f1
commit 1be84a39b8
3 changed files with 6 additions and 14 deletions
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lib/std/start.zig
+4 -3
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@@ -20,8 +20,9 @@ comptime {
_ = root;
if (builtin.output_mode == .Lib and builtin.link_mode == .dynamic) {
if (native_os == .windows and !@hasDecl(root, "_DllMainCRTStartup")) {
@export(&_DllMainCRTStartup, .{ .name = "_DllMainCRTStartup" });
const dll_main_crt_startup = if (builtin.abi.isGnu()) "DllMainCRTStartup" else "_DllMainCRTStartup";
if (native_os == .windows and !builtin.link_libc and !@hasDecl(root, dll_main_crt_startup)) {
@export(&DllMainCRTStartup, .{ .name = dll_main_crt_startup });
}
} else if (builtin.output_mode == .Exe or @hasDecl(root, "main")) {
if (builtin.link_libc and @hasDecl(root, "main")) {
@@ -71,7 +72,7 @@ comptime {
}
}
fn _DllMainCRTStartup(
fn DllMainCRTStartup(
hinstDLL: std.os.windows.HINSTANCE,
fdwReason: std.os.windows.DWORD,
lpReserved: std.os.windows.LPVOID,
src/codegen/llvm.zig
+1
View File
@@ -1746,6 +1746,7 @@ pub const Object = struct {
if (name.eqlSlice("WinMainCRTStartup", ip)) flags.winmain_crt_startup = true;
if (name.eqlSlice("wWinMainCRTStartup", ip)) flags.wwinmain_crt_startup = true;
if (name.eqlSlice("DllMainCRTStartup", ip)) flags.dllmain_crt_startup = true;
if (name.eqlSlice("_DllMainCRTStartup", ip)) flags.dllmain_crt_startup = true;
}
}
src/link/Lld.zig
+1 -11
View File
@@ -637,17 +637,7 @@ fn coffLink(lld: *Lld, arena: Allocator) !void {
try argv.append("-ALTERNATENAME:__image_base__=__ImageBase");
}
if (is_dyn_lib) {
try argv.append(try comp.crtFileAsString(arena, "dllcrt2.obj"));
if (target.cpu.arch == .x86) {
try argv.append("-ALTERNATENAME:__DllMainCRTStartup@12=_DllMainCRTStartup@12");
} else {
try argv.append("-ALTERNATENAME:_DllMainCRTStartup=DllMainCRTStartup");
}
} else {
try argv.append(try comp.crtFileAsString(arena, "crt2.obj"));
}
try argv.append(try comp.crtFileAsString(arena, if (is_dyn_lib) "dllcrt2.obj" else "crt2.obj"));
try argv.append(try comp.crtFileAsString(arena, "libmingw32.lib"));
} else {
try argv.append(switch (comp.config.link_mode) {