c-ares/acinclude.m4

dnl We create a function for detecting which compiler we use and then set as
dnl pendantic compiler options as possible for that particular compiler. The
dnl options are only used for debug-builds.

dnl This is a copy of the original found in curl's configure script. Don't
dnl modify this one, edit the one in curl and copy it back here when that one
dnl is changed.

AC_DEFUN([CURL_CC_DEBUG_OPTS],
[
    if test "$GCC" = "yes"; then

       dnl figure out gcc version!
       AC_MSG_CHECKING([gcc version])
       gccver=`$CC -dumpversion`
       num1=`echo $gccver | cut -d . -f1`
       num2=`echo $gccver | cut -d . -f2`
       gccnum=`(expr $num1 "*" 100 + $num2) 2>/dev/null`
       AC_MSG_RESULT($gccver)

       AC_MSG_CHECKING([if this is icc in disguise])
       AC_EGREP_CPP([^__INTEL_COMPILER], [__INTEL_COMPILER],
         dnl action if the text is found, this it has not been replaced by the
         dnl cpp
         ICC="no"
         AC_MSG_RESULT([no]),
         dnl the text was not found, it was replaced by the cpp
         ICC="yes"
         AC_MSG_RESULT([yes])
       )

       if test "$ICC" = "yes"; then
         dnl this is icc, not gcc.

         dnl ICC warnings we ignore:
         dnl * 279 warns on static conditions in while expressions
         dnl * 269 warns on our "%Od" printf formatters for curl_off_t output:
         dnl   "invalid format string conversion"

         WARN="-wd279,269"

         if test "$gccnum" -gt "600"; then
            dnl icc 6.0 and older doesn't have the -Wall flag
            WARN="-Wall $WARN"
         fi
       else dnl $ICC = yes
         dnl 
         WARN="-W -Wall -Wwrite-strings -pedantic -Wno-long-long -Wundef -Wpointer-arith -Wnested-externs -Winline -Wmissing-declarations -Wmissing-prototypes -Wsign-compare"

         dnl -Wcast-align is a bit too annoying ;-)

         if test "$gccnum" -ge "296"; then
           dnl gcc 2.96 or later
           WARN="$WARN -Wfloat-equal"

           if test "$gccnum" -gt "296"; then
             dnl this option does not exist in 2.96
             WARN="$WARN -Wno-format-nonliteral"
           fi

           dnl -Wunreachable-code seems totally unreliable on my gcc 3.3.2 on
           dnl on i686-Linux as it gives us heaps with false positives
           if test "$gccnum" -ge "303"; then
             dnl gcc 3.3 and later
             WARN="$WARN -Wendif-labels -Wstrict-prototypes"
           fi
         fi

         for flag in $CPPFLAGS; do
           case "$flag" in
            -I*)
              dnl include path
              add=`echo $flag | sed 's/^-I/-isystem /g'`
              WARN="$WARN $add"
              ;;
           esac
         done

       fi dnl $ICC = no

       CFLAGS="$CFLAGS $WARN"

    fi dnl $GCC = yes

    dnl strip off optimizer flags
    NEWFLAGS=""
    for flag in $CFLAGS; do
      case "$flag" in
      -O*)
        dnl echo "cut off $flag"
        ;;
      *)
        NEWFLAGS="$NEWFLAGS $flag"
        ;;
      esac
    done
    CFLAGS=$NEWFLAGS

]) dnl end of AC_DEFUN()


dnl This macro determines if the specified struct exists in the specified file
dnl Syntax:
dnl CARES_CHECK_STRUCT(headers, struct name, if found, [if not found])

AC_DEFUN([CARES_CHECK_STRUCT], [
  AC_MSG_CHECKING([for struct $2])
  AC_TRY_COMPILE([$1], 
    [
      struct $2 struct_instance;
    ], ac_struct="yes", ac_found="no")
  if test "$ac_struct" = "yes" ; then
    AC_MSG_RESULT(yes)
    $3
  else
    AC_MSG_RESULT(no)
    $4
  fi
])

dnl This macro determines if the specified constant exists in the specified file
dnl Syntax:
dnl CARES_CHECK_CONSTANT(headers, constant name, if found, [if not found])

AC_DEFUN([CARES_CHECK_CONSTANT], [
  AC_MSG_CHECKING([for $2])
  AC_EGREP_CPP(VARIABLEWASDEFINED,
   [
      $1

      #ifdef $2
        VARIABLEWASDEFINED
      #else
        NJET
      #endif
    ], ac_constant="yes", ac_constant="no"
  )
  if test "$ac_constant" = "yes" ; then
    AC_MSG_RESULT(yes)
    $3
  else
    AC_MSG_RESULT(no)
    $4
  fi
])