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FindBacktrace: Search and report only when not already found 

Avoid saying "... detected in default set..." each time CMake is run.

Prompted by Rolf Eike Beer on cmake-developers@.
This commit is contained in:
Vadim Zhukov 2013-12-10 15:05:02 +04:00 committed by Brad King
parent 2a384e08cc
commit 9650c09b95
1 changed files with 10 additions and 7 deletions
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17
Modules/FindBacktrace.cmake
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@ -58,17 +58,20 @@ endif(Backtrace_HEADER)
find_path(Backtrace_INCLUDE_DIR "${_Backtrace_HEADER_TRY}")
set(Backtrace_INCLUDE_DIRS ${Backtrace_INCLUDE_DIR})
# First, check if we already have backtrace(), e.g., in libc
cmake_push_check_state(RESET)
set(CMAKE_REQUIRED_INCLUDES ${Backtrace_INCLUDE_DIRS})
check_symbol_exists("backtrace" "${_Backtrace_HEADER_TRY}" _Backtrace_SYM_FOUND)
cmake_pop_check_state()
if (NOT DEFINED Backtrace_LIBRARY)
# First, check if we already have backtrace(), e.g., in libc
cmake_push_check_state(RESET)
set(CMAKE_REQUIRED_INCLUDES ${Backtrace_INCLUDE_DIRS})
check_symbol_exists("backtrace" "${_Backtrace_HEADER_TRY}" _Backtrace_SYM_FOUND)
cmake_pop_check_state()
endif()
if(_Backtrace_SYM_FOUND)
set(Backtrace_LIBRARY)
if(NOT Backtrace_FIND_QUIETLY)
# Avoid repeating the message() call below each time CMake is run.
if(NOT Backtrace_FIND_QUIETLY AND NOT DEFINED Backtrace_LIBRARY)
message(STATUS "backtrace facility detected in default set of libraries")
endif()
set(Backtrace_LIBRARY "" CACHE FILEPATH "Library providing backtrace(3), empty for default set of libraries")
else()
# Check for external library, for non-glibc systems
if(Backtrace_INCLUDE_DIR)