https://bugs.llvm.org/show_bug.cgi?id=47617
Bug ID: 47617
Summary: Delay load stubs are not marked as CFG targets
Product: new-bugs
Version: 10.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: dma...@mozilla.com
CC: andrew.pav...@microsoft.com, htmldevelo...@gmail.com,
llvm-bugs@lists.llvm.org, r...@google.com,
sylves...@debian.org, t...@ritter.vg
test.cpp:
#include <windows.h>
#include <wininet.h>
int main(int, char**)
{
decltype(InternetOpenA)* volatile ptr = &InternetOpenA;
ptr(nullptr, 0, nullptr, nullptr, 0);
return 0;
}
With MSVC, it runs OK:
cl -c -O2 test.cpp -guard:cf -nologo test.cpp && link test.obj -debug
wininet.lib -guard:cf -delayload:wininet.dll delayimp.lib -nologo && test.exe
With LLVM, this reports a CFG failure:
clang-cl -c -O2 test.cpp -guard:cf -nologo && lld-link test.obj -debug
wininet.lib -guard:cf -delayload:wininet.dll delayimp.lib -nologo && test.exe
It happens because the following stub is not marked for CFG:
0:000> u @rax
test!_imp_load_InternetOpenA:
00007ff6`7a6b38a0 488d05f9470800 lea rax,[test!_imp_InternetOpenA
(00007ff6`7a7380a0)]
00007ff6`7a6b38a7 e906000000 jmp test!_tailMerge_wininet_dll
(00007ff6`7a6b38b2)
Seen in clang 10, 11, trunk 12.
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