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[host] windows: trick MinGW into not using memcpy from ntdll

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MinGW seems to decide at random whether it wants to use memcpy from
mscvrt.dll or ntdll.dll. Currently, on Debian buster, ntdll.dll is chosen,
while on sid, mscvrt.dll is chosen.

This commit declares a new .def file for ntdll containing only the
functions we want to link from ntdll.dll, and generates ntdll.a from it
with dlltool. This way, MinGW will never be tempted to link functions
like memcpy from ntdll.dll.
This commit is contained in:
Quantum 2021-07-21 01:30:13 -04:00 committed by Geoffrey McRae
parent 8a70efafb5
commit f5dfc264ba
2 changed files with 23 additions and 0 deletions
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16
host/platform/Windows/CMakeLists.txt
View File

@ -18,6 +18,22 @@ add_compile_definitions(WINVER=0x0601 _WIN32_WINNT=0x0601)
add_subdirectory("capture")
if (MINGW)
# Build our own ntdll.dll import library
# This tricks MinGW into not linking stuff like memcpy from ntdll.dll instead of mscvrt.dll
find_program(DLLTOOL_EXECUTABLE NAMES "x86_64-w64-mingw32-dlltool" "dlltool.exe" DOC "dlltool executable")
add_custom_command(OUTPUT "${PROJECT_BINARY_DIR}/ntdll.a"
COMMAND "${DLLTOOL_EXECUTABLE}" -d "${PROJECT_SOURCE_DIR}/ntdll.def" -l "${PROJECT_BINARY_DIR}/ntdll.a"
MAIN_DEPENDENCY "${PROJECT_SOURCE_DIR}/ntdll.def"
COMMENT "Building import library ntdll.a"
VERBATIM
)
add_custom_target(ntdll_target DEPENDS "${PROJECT_BINARY_DIR}/ntdll.a")
add_library(ntdll STATIC IMPORTED GLOBAL)
add_dependencies(ntdll ntdll_target)
set_target_properties(ntdll PROPERTIES IMPORTED_LOCATION "${PROJECT_BINARY_DIR}/ntdll.a")
endif()
target_link_libraries(platform_Windows
lg_common
capture

7
host/platform/Windows/ntdll.def Normal file
View File

@ -0,0 +1,7 @@
; This file is used to trick MinGW to not like stuff like memcpy from ntdll.dll.
; See CMakeLists.txt for how this is compiled.
LIBRARY "ntdll.dll"
EXPORTS
NtDelayExecution
NtSetTimerResolution