dnl

dnl PAC_RUN_LOG mimics _AC_RUN_LOG which is autoconf internal routine.

dnl We also make sure PAC_RUN_LOG can be used in AS_IF, so the last

dnl test command should have terminating ]), i.e. without newline before ]).

dnl

AC_DEFUN([PAC_RUNLOG],[

{ AS_ECHO(["$as_me:$LINENO: $1"]) >&AS_MESSAGE_LOG_FD

  (eval $1) 2>&AS_MESSAGE_LOG_FD

  ac_status=$?

  AS_ECHO(["$as_me:$LINENO: \$? = $ac_status"]) >&AS_MESSAGE_LOG_FD

  test $ac_status = 0; }])

dnl

dnl PAC_COMMAND_IFELSE is written to replace AC_TRY_EVAL with added logging

dnl to config.log, i.e. AC_TRY_EVAL does not log anything to config.log.

dnl If autoconf provides AC_COMMAND_IFELSE or AC_EVAL_IFELSE,

dnl AC_COMMAND_IFELSE dnl should be replaced by the official autoconf macros.

dnl

dnl PAC_COMMAND_IFELSE(COMMMAND,[ACTION-IF-RUN-OK],[ACTION-IF-RUN-FAIL])

dnl

AC_DEFUN([PAC_COMMAND_IFELSE],[

AS_IF([PAC_RUNLOG([$1])],[

    $2

],[

    AS_ECHO(["$as_me: program exited with status $ac_status"]) >&AS_MESSAGE_LOG_FD

    m4_ifvaln([$3],[

        (exit $ac_status)

        $3

    ])

])

])

AC_DEFUN([PAC_RUNLOG_IFELSE],[

dnl pac_TESTLOG is the internal temporary logfile for this macro.

pac_TESTLOG="pac_test.log"

rm -f $pac_TESTLOG

PAC_COMMAND_IFELSE([$1 > $pac_TESTLOG],[

    ifelse([$2],[],[],[$2])

],[

    AS_ECHO(["*** $1 :"]) >&AS_MESSAGE_LOG_FD

    cat $pac_TESTLOG >&AS_MESSAGE_LOG_FD

    ifelse([$3],[],[],[$3])

])

rm -f $pac_TESTLOG

])

dnl PAC_VAR_PUSHVAL(VARNAME, [LastSavedValue]))

dnl

dnl Save the content of the shell variable, VARNAME, onto a stack.

dnl The saved value of VARNAME is restorable with respect to the nesting

dnl of the macro.

dnl

dnl The Last saved value of VARNAME on the stack is stored in shell variable

dnl pac_LastSavedValueOf_$VARNAME if the 2nd argument is NOT supplied.

dnl If the 2nd argument is present, the last saved value will be stored

dnl in the 2nd argument instead.

dnl

dnl The First saved value of VARNAME on the stack is stored in shell variable

dnl dnl pac_FirstSavedValueOf_$VARNAME.

dnl

AC_DEFUN([PAC_VAR_PUSHVAL],[

# START of PUSHVAL

dnl define local m4-name pac_stk_level.

AS_VAR_PUSHDEF([pac_stk_level], [pac_stk_$1_level])

AS_VAR_SET_IF([pac_stk_level],[

    AS_VAR_ARITH([pac_stk_level], [$pac_stk_level + 1])

],[

    AS_VAR_SET([pac_stk_level], [0])

])

dnl AS_ECHO_N(["PUSHVAL: pac_stk_level = $pac_stk_level, "])

dnl Save the content of VARNAME, i.e. $VARNAME, onto the stack.

AS_VAR_SET([pac_stk_$1_$pac_stk_level],[$$1])

AS_VAR_IF([pac_stk_level], [0], [

    dnl Save the 1st pushed value of VARNAME as pac_FirstSavedValueOf_$VARNAME

    AS_VAR_COPY([pac_FirstSavedValueOf_$1],[pac_stk_$1_$pac_stk_level])

])

ifelse([$2],[],[

    dnl Save the last pushed value of VARNAME as pac_LastSavedValueOf_$VARNAME

    AS_VAR_COPY([pac_LastSavedValueOf_$1],[pac_stk_$1_$pac_stk_level])

    dnl AS_ECHO(["pac_LastSavedValueOf_$1 = $pac_LastSavedValueOf_$1"])

],[

    dnl Save the last pushed value of VARNAME as $2

    AS_VAR_COPY([$2],[pac_stk_$1_$pac_stk_level])

    dnl AS_ECHO(["$2 = $$2"])

])

AS_VAR_POPDEF([pac_stk_level])

# END of PUSHVAL

])

dnl

dnl

dnl

dnl PAC_VAR_POPVAL(VARNAME)

dnl

dnl Restore variable, VARNAME, from the stack.

dnl This macro is safe with respect to the nesting.

dnl Some minimal checking of nesting balance of PAC_VAR_PUSH[POP]VAL()

dnl is done here.

dnl

AC_DEFUN([PAC_VAR_POPVAL],[

# START of POPVAL

dnl define local m4-name pac_stk_level.

AS_VAR_PUSHDEF([pac_stk_level], [pac_stk_$1_level])

AS_VAR_SET_IF([pac_stk_level],[

    AS_VAR_IF([pac_stk_level],[-1],[

        AC_MSG_WARN(["Imbalance of PUSHVAL/POPVAL of $1"])

    ],[

        dnl AS_ECHO_N(["POPVAL: pac_stk_level = $pac_stk_level, "])

        AS_VAR_COPY([$1],[pac_stk_$1_$pac_stk_level])

        dnl AS_ECHO(["popped_val = $$1"])

        AS_VAR_ARITH([pac_stk_level], [ $pac_stk_level - 1 ])

    ])

],[

    AC_MSG_WARN(["Uninitialized PUSHVAL/POPVAL of $1"])

])

AS_VAR_POPDEF([pac_stk_level])

# END of POPVAL

])

dnl

dnl

dnl

dnl PAC_COMPILE_IFELSE_LOG is a wrapper around AC_COMPILE_IFELSE with the

dnl output of ac_compile to a specified logfile instead of AS_MESSAGE_LOG_FD

dnl

dnl PAC_COMPILE_IFELSE_LOG(logfilename, input,

dnl                        [action-if-true], [action-if-false])

dnl

dnl where input, [action-if-true] and [action-if-false] are used

dnl in AC_COMPILE_IFELSE(input, [action-if-true], [action-if-false]).

dnl This macro is nesting safe.

dnl

AC_DEFUN([PAC_COMPILE_IFELSE_LOG],[

dnl

dnl Instead of defining our own ac_compile and do AC_TRY_EVAL

dnl on these variables.  We modify ac_compile used by AC_*_IFELSE

dnl by piping the output of the command to a logfile.  The reason is that

dnl 1) AC_TRY_EVAL is discouraged by Autoconf. 2) defining our ac_compile

dnl could mess up the usage and order of *CFLAGS, LDFLAGS and LIBS in

dnl these commands, i.e. deviate from how GNU standard uses these variables.

dnl

dnl Replace ">&AS_MESSAGE_LOG_FD" by "> FILE 2>&1" in ac_compile.

dnl Save a copy of ac_compile on a stack

dnl which is safe through nested invocations of this macro.

PAC_VAR_PUSHVAL([ac_compile])

dnl Modify ac_compile based on the unmodified ac_compile.

ac_compile="`echo $pac_FirstSavedValueOf_ac_compile | sed -e 's|>.*$|> $1 2>\&1|g'`"

AC_COMPILE_IFELSE([$2],[

    ifelse([$3],[],[:],[$3])

],[

    ifelse([$4],[],[:],[$4])

])

dnl Restore the original ac_compile from the stack.

PAC_VAR_POPVAL([ac_compile])

])

dnl

dnl

dnl

dnl PAC_LINK_IFELSE_LOG is a wrapper around AC_LINK_IFELSE with the

dnl output of ac_link to a specified logfile instead of AS_MESSAGE_LOG_FD

dnl

dnl PAC_LINK_IFELSE_LOG(logfilename, input,

dnl                     [action-if-true], [action-if-false])

dnl

dnl where input, [action-if-true] and [action-if-false] are used

dnl in AC_LINK_IFELSE(input, [action-if-true], [action-if-false]).

dnl This macro is nesting safe.

dnl

AC_DEFUN([PAC_LINK_IFELSE_LOG],[

dnl

dnl Instead of defining our own ac_link and do AC_TRY_EVAL

dnl on these variables.  We modify ac_link used by AC_*_IFELSE

dnl by piping the output of the command to a logfile.  The reason is that

dnl 1) AC_TRY_EVAL is discouraged by Autoconf. 2) defining our ac_link

dnl could mess up the usage and order of *CFLAGS, LDFLAGS and LIBS in

dnl these commands, i.e. deviate from how GNU standard uses these variables.

dnl

dnl Replace ">&AS_MESSAGE_LOG_FD" by "> FILE 2>&1" in ac_link.

dnl Save a copy of ac_link on a stack

dnl which is safe through nested invocations of this macro.

PAC_VAR_PUSHVAL([ac_link])

dnl Modify ac_link based on the unmodified ac_link.

ac_link="`echo $pac_FirstSavedValueOf_ac_link | sed -e 's|>.*$|> $1 2>\&1|g'`"

dnl

AC_LINK_IFELSE([$2],[

    ifelse([$3],[],[:],[$3])

],[

    ifelse([$4],[],[:],[$4])

])

dnl Restore the original ac_link from the stack.

PAC_VAR_POPVAL([ac_link])

])

dnl

dnl

dnl

dnl PAC_COMPLINK_IFELSE (input1, input2, [action-if-true], [action-if-false])

dnl

dnl where input1 and input2 are either AC_LANG_SOURCE or AC_LANG_PROGRAM

dnl enclosed input programs.

dnl

dnl The macro first compiles input1 and uses the object file created

dnl as part of LIBS during linking.  This macro is nesting safe.

dnl

AC_DEFUN([PAC_COMPLINK_IFELSE],[

AC_COMPILE_IFELSE([$1],[

    PAC_RUNLOG([mv conftest.$OBJEXT pac_conftest.$OBJEXT])

    PAC_VAR_PUSHVAL([LIBS])

    LIBS="pac_conftest.$OBJEXT $pac_FirstSavedValueOf_LIBS"

    AC_LINK_IFELSE([$2],[

        ifelse([$3],[],[:],[$3])

    ],[

        ifelse([$4],[],[:],[$4])

    ])

    PAC_VAR_POPVAL([LIBS])

    rm -f pac_conftest.$OBJEXT

],[

    ifelse([$4],[],[:],[$4])

])

])