diff options
Diffstat (limited to 'contrib/libarchive/build/cmake/CheckFuncs.cmake')
-rw-r--r-- | contrib/libarchive/build/cmake/CheckFuncs.cmake | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/contrib/libarchive/build/cmake/CheckFuncs.cmake b/contrib/libarchive/build/cmake/CheckFuncs.cmake new file mode 100644 index 0000000..0670df9 --- /dev/null +++ b/contrib/libarchive/build/cmake/CheckFuncs.cmake @@ -0,0 +1,49 @@ +# Check if the system has the specified function; treat glibc "stub" +# functions as nonexistent: +# CHECK_FUNCTION_EXISTS_GLIBC (FUNCTION FUNCVAR) +# +# FUNCTION - the function(s) where the prototype should be declared +# FUNCVAR - variable to define if the function does exist +# +# In particular, this understands the glibc convention of +# defining macros __stub_XXXX or __stub___XXXX if the function +# does appear in the library but is merely a stub that does nothing. +# By detecting this case, we can select alternate behavior on +# platforms that don't support this functionality. +# +# The following variables may be set before calling this macro to +# modify the way the check is run: +# +# CMAKE_REQUIRED_FLAGS = string of compile command line flags +# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) +# CMAKE_REQUIRED_INCLUDES = list of include directories +# Copyright (c) 2009, Michihiro NAKAJIMA +# +# Redistribution and use is allowed according to the terms of the BSD license. +# For details see the accompanying COPYING-CMAKE-SCRIPTS file. + +INCLUDE(CheckFunctionExists) +GET_FILENAME_COMPONENT(_selfdir_CheckFunctionExistsGlibc + "${CMAKE_CURRENT_LIST_FILE}" PATH) + +MACRO (CHECK_FUNCTION_EXISTS_GLIBC _FUNC _FUNCVAR) + IF(NOT DEFINED ${_FUNCVAR}) + SET(CHECK_STUB_FUNC_1 "__stub_${_FUNC}") + SET(CHECK_STUB_FUNC_2 "__stub___${_FUNC}") + CONFIGURE_FILE( ${_selfdir_CheckFunctionExistsGlibc}/CheckFuncs_stub.c.in + ${CMAKE_CURRENT_BINARY_DIR}/cmake.tmp/CheckFuncs_stub.c IMMEDIATE) + TRY_COMPILE(__stub + ${CMAKE_CURRENT_BINARY_DIR} + ${CMAKE_CURRENT_BINARY_DIR}/cmake.tmp/CheckFuncs_stub.c + COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} + CMAKE_FLAGS + -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS} + "${CHECK_INCLUDE_FILE_C_INCLUDE_DIRS}") + IF (__stub) + SET("${_FUNCVAR}" "" CACHE INTERNAL "Have function ${_FUNC}") + ELSE (__stub) + CHECK_FUNCTION_EXISTS("${_FUNC}" "${_FUNCVAR}") + ENDIF (__stub) + ENDIF(NOT DEFINED ${_FUNCVAR}) +ENDMACRO (CHECK_FUNCTION_EXISTS_GLIBC) + |