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-rw-r--r--Modules/CMakeDetermineCCompiler.cmake5
1 files changed, 5 insertions, 0 deletions
diff --git a/Modules/CMakeDetermineCCompiler.cmake b/Modules/CMakeDetermineCCompiler.cmake
index cd07ba9..0f80f9c 100644
--- a/Modules/CMakeDetermineCCompiler.cmake
+++ b/Modules/CMakeDetermineCCompiler.cmake
@@ -85,6 +85,11 @@ else()
# ARMClang need target options
"--target=arm-arm-none-eabi -mcpu=cortex-m3"
+
+ # MSVC needs at least one include directory for __has_include to function,
+ # but custom toolchains may run MSVC with no INCLUDE env var and no -I flags.
+ # Also avoid linking so this works with no LIB env var.
+ "-c -I__does_not_exist__"
)
endif()
if(CMAKE_C_COMPILER_TARGET)