Test static linking with LINK_SEARCH_START_STATIC

Add "LinkStatic" test that links a static executable against "libm.a".
Pass both "/usr/lib/libm.a" and "-lm" to target_link_libraries to
trigger the link type logic for both cases.  If CMake incorrectly
switches the link type to shared for "-lm" then the link will fail.
This commit is contained in:
Brad King 2011-03-03 18:02:53 -05:00
parent 5abfb57184
commit 077954d4cb
3 changed files with 48 additions and 0 deletions

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@ -999,6 +999,22 @@ ${CMake_BINARY_DIR}/bin/cmake -DVERSION=master -P ${CMake_SOURCE_DIR}/Utilities/
SET_TESTS_PROPERTIES ( linkorder2 PROPERTIES DEPENDS linkorder1)
SET_TESTS_PROPERTIES ( SimpleInstall-Stage2 PROPERTIES DEPENDS SimpleInstall)
# Test static linking on toolchains known to support it.
IF("${CMAKE_C_COMPILER_ID}" MATCHES "^(GNU)$"
AND NOT APPLE AND NOT WIN32 AND NOT CYGWIN
AND EXISTS "/usr/lib/libm.a")
ADD_TEST(LinkStatic ${CMAKE_CTEST_COMMAND}
--build-and-test
"${CMake_SOURCE_DIR}/Tests/LinkStatic"
"${CMake_BINARY_DIR}/Tests/LinkStatic"
--build-generator ${CMAKE_TEST_GENERATOR}
--build-makeprogram ${CMAKE_TEST_MAKEPROGRAM}
--build-project LinkStatic
--build-options -DMATH_LIBRARY:FILEPATH=/usr/lib/libm.a
--test-command LinkStatic
)
ENDIF()
IF(NOT CMAKE_TEST_DIFFERENT_GENERATOR)
ADD_TEST(kwsys ${CMAKE_CTEST_COMMAND}
--build-and-test

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@ -0,0 +1,27 @@
cmake_minimum_required(VERSION 2.8.4.20110303 FATAL_ERROR)
project(LinkStatic C)
if(NOT "${CMAKE_C_COMPILER_ID}" MATCHES "^(GNU)$")
message(FATAL_ERROR "This test works only with the GNU compiler!")
endif()
find_library(MATH_LIBRARY NAMES libm.a)
if(MATH_LIBRARY)
get_filename_component(MATH_LIB_DIR ${MATH_LIBRARY} PATH)
link_directories(${MATH_LIB_DIR})
# Name the library both with a full path and as "-lm" to
# activate the link type switching code for both cases.
# If the second one links shared then the link will fail.
set(MATH_LIBRARIES ${MATH_LIBRARY} -lm)
else()
message(FATAL_ERROR "Cannot find libm.a needed for this test")
endif()
add_executable(LinkStatic LinkStatic.c)
target_link_libraries(LinkStatic ${MATH_LIBRARIES})
# Enable static linking.
set(LinkStatic_FLAG "-static" CACHE STRING "Flag to link statically")
set_property(TARGET LinkStatic PROPERTY LINK_FLAGS "${LinkStatic_FLAG}")
set_property(TARGET LinkStatic PROPERTY LINK_SEARCH_START_STATIC 1)
#set_property(TARGET LinkStatic PROPERTY LINK_SEARCH_END_STATIC 1) # insufficient

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@ -0,0 +1,5 @@
#include <math.h>
int main(void)
{
return (int)sin(0);
}