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INCLUDE (CheckCSourceRuns)
SET(WITH_PCRE "auto" CACHE STRING
"Which pcre to use (possible values are 'bundled', 'system', or 'auto')")
MACRO (CHECK_PCRE)
IF(WITH_PCRE STREQUAL "system" OR WITH_PCRE STREQUAL "auto")
CHECK_LIBRARY_EXISTS(pcre pcre_stack_guard "" HAVE_PCRE_STACK_GUARD)
IF(NOT CMAKE_CROSSCOMPILING)
SET(CMAKE_REQUIRED_LIBRARIES "pcre")
CHECK_C_SOURCE_RUNS("
#include <pcre.h>
int main() {
return -pcre_exec(NULL, NULL, NULL, -999, -999, 0, NULL, 0) < 256;
}" PCRE_STACK_SIZE_OK)
SET(CMAKE_REQUIRED_LIBRARIES)
ENDIF()
ENDIF()
IF(NOT HAVE_PCRE_STACK_GUARD OR NOT PCRE_STACK_SIZE_OK OR
WITH_PCRE STREQUAL "bundled")
IF (WITH_PCRE STREQUAL "system")
MESSAGE(FATAL_ERROR "system pcre is not found or unusable")
ENDIF()
SET(PCRE_INCLUDES ${CMAKE_BINARY_DIR}/pcre ${CMAKE_SOURCE_DIR}/pcre)
ADD_SUBDIRECTORY(pcre)
ENDIF()
ENDMACRO()
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