188 lines
6.6 KiB
Plaintext
188 lines
6.6 KiB
Plaintext
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dnl Check for LIBMODBUS compiler flags. On success, set nut_have_libmodbus="yes"
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dnl and set LIBMODBUS_CFLAGS and LIBMODBUS_LIBS. On failure, set
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dnl nut_have_libmodbus="no". This macro can be run multiple times, but will
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dnl do the checking only once.
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AC_DEFUN([NUT_CHECK_LIBMODBUS],
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[
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if test -z "${nut_have_libmodbus_seen}"; then
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nut_have_libmodbus_seen=yes
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dnl save CFLAGS and LIBS
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CFLAGS_ORIG="${CFLAGS}"
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LIBS_ORIG="${LIBS}"
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NUT_CHECK_PKGCONFIG
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AS_IF([test x"$have_PKG_CONFIG" = xyes],
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[AC_MSG_CHECKING(for libmodbus version via pkg-config)
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LIBMODBUS_VERSION="`$PKG_CONFIG --silence-errors --modversion libmodbus 2>/dev/null`"
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if test "$?" != "0" -o -z "${LIBMODBUS_VERSION}"; then
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LIBMODBUS_VERSION="none"
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fi
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AC_MSG_RESULT(${LIBMODBUS_VERSION} found)
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],
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[LIBMODBUS_VERSION="none"
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AC_MSG_NOTICE([can not check libmodbus settings via pkg-config])
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]
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)
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AS_IF([test x"$LIBMODBUS_VERSION" != xnone],
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[CFLAGS="`$PKG_CONFIG --silence-errors --cflags libmodbus 2>/dev/null`"
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LIBS="`$PKG_CONFIG --silence-errors --libs libmodbus 2>/dev/null`"
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],
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[CFLAGS="-I/usr/include/modbus"
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LIBS="-lmodbus"
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]
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)
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AC_MSG_CHECKING(for libmodbus cflags)
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AC_ARG_WITH(modbus-includes,
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AS_HELP_STRING([@<:@--with-modbus-includes=CFLAGS@:>@], [include flags for the libmodbus library]),
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[
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case "${withval}" in
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yes|no)
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AC_MSG_ERROR(invalid option --with(out)-modbus-includes - see docs/configure.txt)
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;;
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*)
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CFLAGS="${withval}"
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;;
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esac
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], [])
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AC_MSG_RESULT([${CFLAGS}])
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AC_MSG_CHECKING(for libmodbus ldflags)
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AC_ARG_WITH(modbus-libs,
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AS_HELP_STRING([@<:@--with-modbus-libs=LIBS@:>@], [linker flags for the libmodbus library]),
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[
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case "${withval}" in
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yes|no)
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AC_MSG_ERROR(invalid option --with(out)-modbus-libs - see docs/configure.txt)
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;;
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*)
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LIBS="${withval}"
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;;
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esac
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], [])
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AC_MSG_RESULT([${LIBS}])
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dnl check if libmodbus is usable
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AC_CHECK_HEADERS(modbus.h, [nut_have_libmodbus=yes], [nut_have_libmodbus=no], [AC_INCLUDES_DEFAULT])
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AC_CHECK_FUNCS(modbus_new_rtu, [], [nut_have_libmodbus=no])
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AC_CHECK_FUNCS(modbus_new_tcp, [], [nut_have_libmodbus=no])
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AC_CHECK_FUNCS(modbus_set_byte_timeout, [], [nut_have_libmodbus=no])
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AC_CHECK_FUNCS(modbus_set_response_timeout, [], [nut_have_libmodbus=no])
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dnl modbus_set_byte_timeout() and modbus_set_response_timeout()
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dnl in 3.0.x and 3.1.x have different args (since ~2013): the
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dnl older version used to accept timeout as a struct timeval
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dnl instead of seconds and microseconds. Detect which we use?..
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AS_IF([test x"$nut_have_libmodbus" = xyes],
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[dnl Do not rely on versions if we can test actual API
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AX_C_PRAGMAS
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AC_LANG_PUSH([C])
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AC_CACHE_CHECK([types of arguments for modbus_set_byte_timeout],
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[nut_cv_func_modbus_set_byte_timeout_args],
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[nut_cv_func_modbus_set_byte_timeout_args="unknown"
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AC_COMPILE_IFELSE(
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[dnl Try purely the old API (timeval)
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AC_LANG_PROGRAM([
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#include <time.h>
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#include <modbus.h>
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], [modbus_t *ctx; struct timeval to = (struct timeval){0};
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modbus_set_byte_timeout(ctx, &to);])
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], [nut_cv_func_modbus_set_byte_timeout_args="timeval"
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dnl Try the old API in more detail: check
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dnl if we can just assign uint32's for new
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dnl code into timeval fields (exist+numeric)?
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([
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#include <time.h>
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#include <stdint.h>
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#include <modbus.h>
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], [modbus_t *ctx; uint32_t to_sec = 10, to_usec = 50;
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struct timeval to = (struct timeval){0};
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/* TODO: Clarify and detect warning names and
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* so pragmas for signed/unsigned assignment (e.g.
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* for timeval definitions that have "long" fields)
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*/
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#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_SIGN_COMPARE
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# pragma GCC diagnostic ignored "-Wsign-compare"
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#endif
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#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_SIGN_CONVERSION
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# pragma GCC diagnostic ignored "-Wsign-conversion"
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#endif
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to.tv_sec = to_sec;
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to.tv_usec = to_usec;
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modbus_set_byte_timeout(ctx, &to);
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])
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], [nut_cv_func_modbus_set_byte_timeout_args="timeval_numeric_fields"])
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],
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[dnl Try another API variant: new API with
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dnl fields of struct timeval as numbers
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dnl (checks they exist, and are compatible
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dnl numeric types so compiler can convert)
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([
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#include <time.h>
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#include <stdint.h>
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#include <modbus.h>
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], [modbus_t *ctx; struct timeval to = (struct timeval){0};
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/* TODO: Clarify and detect warning names and
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* so pragmas for signed/unsigned assignment (e.g.
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* for timeval definitions that have "long" fields)
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*/
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#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_SIGN_COMPARE
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# pragma GCC diagnostic ignored "-Wsign-compare"
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#endif
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#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_SIGN_CONVERSION
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# pragma GCC diagnostic ignored "-Wsign-conversion"
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#endif
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uint32_t to_sec = to.tv_sec, to_usec = to.tv_usec;
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modbus_set_byte_timeout(ctx, to_sec, to_usec);
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])
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], [nut_cv_func_modbus_set_byte_timeout_args="sec_usec_uint32_cast_timeval_fields"],
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[dnl Try another API variant: new API purely (two uint32's)
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([
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#include <stdint.h>
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#include <modbus.h>
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], [modbus_t *ctx; uint32_t to_sec = 0, to_usec = 0;
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modbus_set_byte_timeout(ctx, to_sec, to_usec);])
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], [nut_cv_func_modbus_set_byte_timeout_args="sec_usec_uint32"])
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])
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])
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])
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dnl NOTE: We could add similar tests to above for
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dnl other time-related methods, but for now keep
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dnl it simple -- and assume some same approach
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dnl applies to the same generation of the library.
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AC_LANG_POP([C])
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AC_MSG_RESULT([Found types to use for modbus_set_byte_timeout: ${nut_cv_func_modbus_set_byte_timeout_args}])
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dnl NOTE: code should check for having a token name defined e.g.:
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dnl #ifdef NUT_MODBUS_TIMEOUT_ARG_sec_usec_uint32
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dnl Alas, we can't pass variables as macro name to AC_DEFINE
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COMMENT="Define to specify timeout method args approach for libmodbus"
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AS_CASE(["${nut_cv_func_modbus_set_byte_timeout_args}"],
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[timeval_numeric_fields], [AC_DEFINE([NUT_MODBUS_TIMEOUT_ARG_timeval_numeric_fields], 1, [${COMMENT}])],
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[timeval], [AC_DEFINE([NUT_MODBUS_TIMEOUT_ARG_timeval], 1, [${COMMENT}])],
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[sec_usec_uint32_cast_timeval_fields], [AC_DEFINE([NUT_MODBUS_TIMEOUT_ARG_sec_usec_uint32_cast_timeval_fields], 1, [${COMMENT}])],
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[sec_usec_uint32], [AC_DEFINE([NUT_MODBUS_TIMEOUT_ARG_sec_usec_uint32], 1, [${COMMENT}])],
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[dnl default
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AC_MSG_WARN([Cannot find proper types to use for modbus_set_byte_timeout])
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nut_have_libmodbus=no]
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)
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])
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AS_IF([test x"${nut_have_libmodbus}" = x"yes"],
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[LIBMODBUS_CFLAGS="${CFLAGS}"
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LIBMODBUS_LIBS="${LIBS}"]
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)
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dnl restore original CFLAGS and LIBS
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CFLAGS="${CFLAGS_ORIG}"
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LIBS="${LIBS_ORIG}"
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fi
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])
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