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-rw-r--r--Modules/CMakeDetermineCCompiler.cmake4
-rw-r--r--Modules/CMakeDetermineCXXCompiler.cmake4
2 files changed, 8 insertions, 0 deletions
diff --git a/Modules/CMakeDetermineCCompiler.cmake b/Modules/CMakeDetermineCCompiler.cmake
index cd07ba9..ca497f1 100644
--- a/Modules/CMakeDetermineCCompiler.cmake
+++ b/Modules/CMakeDetermineCCompiler.cmake
@@ -85,6 +85,10 @@ 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.
+ "-I__does_not_exist__"
)
endif()
if(CMAKE_C_COMPILER_TARGET)
diff --git a/Modules/CMakeDetermineCXXCompiler.cmake b/Modules/CMakeDetermineCXXCompiler.cmake
index 3d1a7bb..e297f90 100644
--- a/Modules/CMakeDetermineCXXCompiler.cmake
+++ b/Modules/CMakeDetermineCXXCompiler.cmake
@@ -80,6 +80,10 @@ 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.
+ "-I__does_not_exist__"
)
endif()