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[TravisCI][CMake] Add Z3_C_EXAMPLES_FORCE_CXX_LINKER CMake option

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and propagate its value into the C API examples.

This flag forces the C API examples to use the C++ compiler as the
linker rather than the C compiler. This a workaround to avoid linking
errors when building with UBSan.
This commit is contained in:
Dan Liew 2017-10-06 15:25:41 +01:00
parent 64ee9f168d
commit a9fcfc531b
5 changed files with 52 additions and 2 deletions
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21
examples/CMakeLists.txt
View file

@ -7,6 +7,19 @@ else()
set(EXTERNAL_PROJECT_BUILD_ALWAYS_ARG "")
endif()
option(Z3_C_EXAMPLES_FORCE_CXX_LINKER
"Force C++ linker when building C example projects" OFF)
if (Z3_C_EXAMPLES_FORCE_CXX_LINKER)
# HACK: This is a workaround for UBSan.
message(STATUS "Forcing C++ linker to be used when building example C projects")
set(EXTERNAL_C_PROJ_USE_CXX_LINKER_ARG
"-DFORCE_CXX_LINKER=ON"
)
else()
set(EXTERNAL_C_PROJ_USE_CXX_LINKER_ARG "")
endif()
################################################################################
# Build example project using libz3's C API as an external project
################################################################################
@ -14,7 +27,9 @@ ExternalProject_Add(c_example
DEPENDS libz3
# Configure step
SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/c"
CMAKE_ARGS "-DZ3_DIR=${CMAKE_BINARY_DIR}"
CMAKE_ARGS
"-DZ3_DIR=${CMAKE_BINARY_DIR}"
"${EXTERNAL_C_PROJ_USE_CXX_LINKER_ARG}"
# Build step
${EXTERNAL_PROJECT_BUILD_ALWAYS_ARG}
BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/c_example_build_dir"
@ -30,7 +45,9 @@ ExternalProject_Add(c_maxsat_example
DEPENDS libz3
# Configure step
SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/maxsat"
CMAKE_ARGS "-DZ3_DIR=${CMAKE_BINARY_DIR}"
CMAKE_ARGS
"-DZ3_DIR=${CMAKE_BINARY_DIR}"
"${EXTERNAL_C_PROJ_USE_CXX_LINKER_ARG}"
# Build step
${EXTERNAL_PROJECT_BUILD_ALWAYS_ARG}
BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/c_maxsat_example_build_dir"

11
examples/c/CMakeLists.txt
View file

@ -22,6 +22,17 @@ message(STATUS "Found Z3 ${Z3_VERSION_STRING}")
message(STATUS "Z3_DIR: ${Z3_DIR}")
add_executable(c_example test_capi.c)
option(FORCE_CXX_LINKER "Force linker with C++ linker" OFF)
if (FORCE_CXX_LINKER)
# This is a hack for avoiding UBSan linking errors
message(STATUS "Forcing use of C++ linker")
set_target_properties(c_example
PROPERTIES
LINKER_LANGUAGE CXX
)
endif()
target_include_directories(c_example PRIVATE ${Z3_C_INCLUDE_DIRS})
target_link_libraries(c_example PRIVATE ${Z3_LIBRARIES})

10
examples/maxsat/CMakeLists.txt
View file

@ -25,6 +25,16 @@ add_executable(c_maxsat_example maxsat.c)
target_include_directories(c_maxsat_example PRIVATE ${Z3_C_INCLUDE_DIRS})
target_link_libraries(c_maxsat_example PRIVATE ${Z3_LIBRARIES})
option(FORCE_CXX_LINKER "Force linker with C++ linker" OFF)
if (FORCE_CXX_LINKER)
# This is a hack for avoiding UBSan linking errors
message(STATUS "Forcing use of C++ linker")
set_target_properties(c_maxsat_example
PROPERTIES
LINKER_LANGUAGE CXX
)
endif()
if ("${CMAKE_SYSTEM_NAME}" MATCHES "[Ww]indows")
# On Windows we need to copy the Z3 libraries
# into the same directory as the executable