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CMake: Throw a clear error when config.h in top-level source directory

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This causes weird, difficult to debug compilation errors. Usually
caused by trying to run CMake against a source that had an
in-tree autoconfig build.

Note that you're able to do out-of-tree autoconfig builds and
they can obviously mix with out-of-tree cmake builds.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20230703153925.48990-1-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26809.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
This commit is contained in:
Frank Lichtenheld 2023-07-03 17:39:25 +02:00 committed by Gert Doering
parent eb3cd5ea36
commit 0652ae84f4
1 changed files with 4 additions and 0 deletions
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4
CMakeLists.txt
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@ -26,6 +26,10 @@ if (NOT WIN32 AND NOT ${UNSUPPORTED_BUILDS})
message(FATAL_ERROR "Note: on Unix platform the official and supported build method is using autoconfig. CMake based build should be only used for Windows and internal testing/development.")
endif()
if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/config.h")
message(FATAL_ERROR "The top level source directory has a config.h file. Note that you can't mix in-tree autoconfig builds with out-of-tree cmake builds.")
endif ()
option(MBED "BUILD with mbed" OFF)
option(WOLFSSL "BUILD with wolfSSL" OFF)
option(ENABLE_LZ4 "BUILD with lz4" ON)