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https://github.com/libevent/libevent.git
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a0bfe2c451
Fixes in cmake, to make it more like configure and support some cross-compiling. * cmake-configure-fixes-v2: cmake: fix extracting of the version from git (check for number of matches) Detect arch4random_addrandom() existence Use off_t instead of ev_off_t for sendfile() (fixes android build) cmake: detect _GNU_SOURCE not by __GNU_LIBRARY__ only (fallback to _GNU_SOURCE) Check for WNOWAIT in waitpid() in runtime (not in cmake/configure) cmake: add <pthread.h> into CMAKE_REQUIRED_INCLUDES for sizeof(pthread_t) cmake: fix values for #cmakedefine cmake: drop duplicates from event-config template cmake: add value for the #cmakedefine macros (like autoconf) cmake: Fix checking of enum values from sysctl.h (cherry picked from commit 5aade2d30b6c5eff226cbf7b63fda5a01987ba4f)
24 lines
740 B
CMake
24 lines
740 B
CMake
include(CheckCSourceCompiles)
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macro(check_const_exists CONST FILES VARIABLE)
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set(check_const_exists_source "")
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foreach(file ${FILES})
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set(check_const_exists_source
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"${check_const_exists_source}
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#include <${file}>")
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endforeach()
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set(check_const_exists_source
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"${check_const_exists_source}
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int main() { (void)${CONST}; return 0; }")
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check_c_source_compiles("${check_const_exists_source}" ${VARIABLE})
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if (${${VARIABLE}})
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set(${VARIABLE} 1 CACHE INTERNAL "Have const ${CONST}")
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message(STATUS "Looking for ${CONST} - found")
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else()
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set(${VARIABLE} 0 CACHE INTERNAL "Have const ${CONST}")
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message(STATUS "Looking for ${CONST} - not found")
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endif()
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endmacro(check_const_exists)
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