Disable mangling for msvc stack builtins
This prevents linker errors in test builds due to the `jmp` instruction in __alloca
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@ -2,9 +2,13 @@ use core::intrinsics;
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// NOTE These functions are implemented using assembly because they using a custom
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// calling convention which can't be implemented using a normal Rust function
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// NOTE These functions are never mangled as they are not tested against compiler-rt
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// and mangling ___chkstk would break the `jmp ___chkstk` instruction in __alloca
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#[cfg(windows)]
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#[naked]
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#[cfg_attr(not(test), no_mangle)]
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#[no_mangle]
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pub unsafe fn ___chkstk_ms() {
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asm!("push %rcx
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push %rax
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@ -28,7 +32,7 @@ pub unsafe fn ___chkstk_ms() {
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#[cfg(windows)]
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#[naked]
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#[cfg_attr(not(test), no_mangle)]
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#[no_mangle]
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pub unsafe fn __alloca() {
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asm!("mov %rcx,%rax // x64 _alloca is a normal function with parameter in rcx
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jmp ___chkstk // Jump to ___chkstk since fallthrough may be unreliable");
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@ -37,7 +41,7 @@ pub unsafe fn __alloca() {
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#[cfg(windows)]
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#[naked]
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#[cfg_attr(not(test), no_mangle)]
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#[no_mangle]
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pub unsafe fn ___chkstk() {
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asm!("push %rcx
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cmp $$0x1000,%rax
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