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[CMake] Get rid of LLVM_DYLIB_EXPORT_ALL, and make it the default, add libLLVM-C on darwin to cover the C API needs.

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Summary:
We've had a lot of discussion in the past about the meaningful and useful default behaviors for the llvm-shlib tool. The original implementation was heavily geared toward Apple's use, and I think that was wrong. This patch seeks to correct that.

I've removed the LLVM_DYLIB_EXPORT_ALL variable and made libLLVM export everything by default.

I've also added a new target that is only built on Darwin for libLLVM-C as a library that re-exports the LLVM-C API. This library is not built on Linux because ELF doesn't support re-export libraries in the same way MachO does.

Reviewers: chapuni, resistor, bogner, axw

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13842

llvm-svn: 251411
This commit is contained in:
Chris Bieneman 2015-10-27 16:02:04 +00:00
parent 2110df5fda
commit d3dd2855e4
2 changed files with 48 additions and 43 deletions
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8
CMakeLists.txt
View File

@ -374,8 +374,12 @@ if(NOT DEFINED LLVM_DYLIB_COMPONENTS)
"Semicolon-separated list of components to include in libLLVM, or \"all\".")
endif()
option(LLVM_LINK_LLVM_DYLIB "Link tools against the libllvm dynamic library" OFF)
option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" ${LLVM_LINK_LLVM_DYLIB})
option(LLVM_DYLIB_EXPORT_ALL "Export all symbols from libLLVM.dylib (default is C API only" ${LLVM_LINK_LLVM_DYLIB})
option(LLVM_BUILD_LLVM_C_DYLIB "Build libllvm-c re-export library (Darwin Only)" OFF)
set(LLVM_BUILD_LLVM_DYLIB_default OFF)
if(LLVM_LINK_LLVM_DYLIB OR LLVM_BUILD_LLVM_C_DYLIB)
set(LLVM_BUILD_LLVM_DYLIB_default ON)
endif()
option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" ${LLVM_BUILD_LLVM_DYLIB_default})
set(LLVM_DISABLE_LLVM_DYLIB_ATEXIT_DEFAULT ON)
if (LLVM_LINK_LLVM_DYLIB)
set(LLVM_DISABLE_LLVM_DYLIB_ATEXIT_DEFAULT OFF)

83
tools/llvm-shlib/CMakeLists.txt
View File

@ -11,8 +11,8 @@ set(SOURCES
llvm_map_components_to_libnames(LIB_NAMES ${LLVM_DYLIB_COMPONENTS})
if(LLVM_LINK_LLVM_DYLIB)
if(NOT LLVM_DYLIB_EXPORT_ALL)
message(FATAL_ERROR "LLVM_DYLIB_EXPORT_ALL must be ON when LLVM_LINK_LLVM_DYLIB is ON")
if(LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
message(WARNING "Using LLVM_LINK_LLVM_DYLIB with LLVM_DYLIB_EXPORTED_SYMBOL_FILE may not work. Use at your own risk.")
endif()
# libLLVM.so should not have any dependencies on any other LLVM
@ -33,41 +33,7 @@ if(LLVM_LINK_LLVM_DYLIB)
set(LIB_NAMES ${FILTERED_LIB_NAMES})
endif()
if(NOT DEFINED LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
# To get the export list for a single llvm library:
# nm ${LIB_PATH} | awk "/T _LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LIB_PATH}.exports
if (NOT LLVM_DYLIB_EXPORT_ALL)
if( WIN32 AND NOT CYGWIN )
message(FATAL_ERROR "Auto-generation not implemented for Win32 without GNU utils. Please specify LLVM_EXPORTED_SYMBOL_FILE.")
endif()
set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_BINARY_DIR}/libllvm.exports)
foreach (lib ${LIB_NAMES})
set(LIB_DIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
set(LIB_NAME ${LIB_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}${lib})
set(LIB_PATH ${LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
set(LIB_EXPORTS_PATH ${LIB_NAME}.exports)
list(APPEND LLVM_DYLIB_REQUIRED_EXPORTS ${LIB_EXPORTS_PATH})
add_custom_command(OUTPUT ${LIB_EXPORTS_PATH}
COMMAND nm ${LIB_PATH} | awk "/T _LLVM/ || /T LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LIB_EXPORTS_PATH}
WORKING_DIRECTORY ${LIB_DIR}
DEPENDS ${lib}
COMMENT "Generating Export list for ${lib}..."
VERBATIM )
endforeach ()
add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
COMMAND cat ${LLVM_DYLIB_REQUIRED_EXPORTS} > ${LLVM_EXPORTED_SYMBOL_FILE}
WORKING_DIRECTORY ${LIB_DIR}
DEPENDS ${LLVM_DYLIB_REQUIRED_EXPORTS}
COMMENT "Generating combined export list...")
add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
endif()
else()
if(LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
set(LLVM_EXPORTED_SYMBOL_FILE ${LLVM_DYLIB_EXPORTED_SYMBOL_FILE})
add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
endif()
@ -84,13 +50,48 @@ endif()
target_link_libraries(LLVM PRIVATE ${LIB_NAMES})
if(TARGET libLLVMExports)
add_dependencies(LLVM libLLVMExports)
endif()
if (APPLE)
set_property(TARGET LLVM APPEND_STRING PROPERTY
LINK_FLAGS
" -compatibility_version 1 -current_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}")
endif()
if(TARGET libLLVMExports)
add_dependencies(LLVM libLLVMExports)
endif()
if(LLVM_BUILD_LLVM_C_DYLIB)
# To get the export list for a single llvm library:
# nm ${LIB_PATH} | awk "/T _LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LIB_PATH}.exports
if(NOT APPLE)
message(FATAL_ERROR "Generating libLLVM-c is only supported on Darwin")
endif()
set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_BINARY_DIR}/libllvm-c.exports)
set(LIB_DIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
set(LIB_NAME ${LIB_DIR}/${CMAKE_SHARED_LIBRARY_PREFIX}LLVM)
set(LIB_PATH ${LIB_NAME}${CMAKE_SHARED_LIBRARY_SUFFIX})
set(LIB_EXPORTS_PATH ${LIB_NAME}.exports)
list(APPEND LLVM_DYLIB_REQUIRED_EXPORTS ${LIB_EXPORTS_PATH})
add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
COMMAND nm ${LIB_PATH} | awk "/T _LLVM/ || /T LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" > ${LLVM_EXPORTED_SYMBOL_FILE}
WORKING_DIRECTORY ${LIB_DIR}
DEPENDS LLVM
COMMENT "Generating Export list for LLVM..."
VERBATIM )
add_custom_target(libLLVMCExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
add_llvm_library(LLVM-C SHARED ${SOURCES})
target_link_libraries(LLVM-C PUBLIC LLVM)
add_dependencies(LLVM-C libLLVMCExports)
set_property(TARGET LLVM-C APPEND_STRING PROPERTY
LINK_FLAGS
" -compatibility_version 1 -current_version ${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH} -Wl,-reexport_library ${LIB_PATH}")
endif()