acinclude.m4

struct hostent *
gethostbyname_r(const char *, struct hostent *, char *, int, int *);],[
gethostbyname_r(NULL, NULL, NULL, 0, NULL);],[
	  AC_MSG_RESULT(yes)
	  AC_DEFINE(HAVE_GETHOSTBYNAME_R_5, 1, [gethostbyname_r() takes 5 args])
          ac_cv_gethostbyname_args=5],[
	  AC_MSG_RESULT(no)
	  AC_MSG_CHECKING([if gethostbyname_r takes 6 arguments])
	  AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>
#undef NULL
#define NULL (void *)0

int
gethostbyname_r(const char *, struct hostent *, char *, size_t,
struct hostent **, int *);],[
gethostbyname_r(NULL, NULL, NULL, 0, NULL, NULL);],[
	    AC_MSG_RESULT(yes)
	    AC_DEFINE(HAVE_GETHOSTBYNAME_R_6, 1, [gethostbyname_r() takes 6 args])
            ac_cv_gethostbyname_args=6],[
	    AC_MSG_RESULT(no)
	    have_missing_r_funcs="$have_missing_r_funcs gethostbyname_r"],
	    [ac_cv_gethostbyname_args=0])],
	  [ac_cv_gethostbyname_args=0])],
	[ac_cv_gethostbyname_args=0])],
      [ac_cv_gethostbyname_args=0])])

if test "$ac_cv_func_gethostbyname_r" = "yes"; then
  if test "$ac_cv_gethostbyname_args" = "0"; then
    dnl there's a gethostbyname_r() function, but we don't know how
    dnl many arguments it wants!
    AC_MSG_ERROR([couldn't figure out how to use gethostbyname_r()])
  fi
fi
])


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.

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         dnl action if the text is found, this it has not been replaced by the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 * 269 warns on our "%Od" printf formatters for curl_off_t output:
         dnl   "invalid format string conversion"
         dnl * 279 warns on static conditions in while expressions
         dnl * 981 warns on "operands are evaluated in unspecified order"
         dnl * 1418 "external definition with no prior declaration"
         dnl * 1419 warns on "external declaration in primary source file"
         dnl   which we know and do on purpose.

         WARN="-wd279,269,981,1418,1419"

         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 this is a set of options we believe *ALL* gcc versions support:
         WARN="-W -Wall -Wwrite-strings -pedantic -Wpointer-arith -Wnested-externs -Winline -Wmissing-prototypes"

         dnl -Wcast-align is a bit too annoying on all gcc versions ;-)

         if test "$gccnum" -ge "207"; then
           dnl gcc 2.7 or later
           WARN="$WARN -Wmissing-declarations"
         fi

         if test "$gccnum" -gt "295"; then
           dnl only if the compiler is newer than 2.95 since we got lots of
           dnl "`_POSIX_C_SOURCE' is not defined" in system headers with
           dnl gcc 2.95.4 on FreeBSD 4.9!
           WARN="$WARN -Wundef -Wno-long-long -Wsign-compare"
         fi

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

         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.
         dnl Also, on gcc 4.0.X it is totally unbearable and complains all
         dnl over making it unusable for generic purposes. Let's not use it.

         if test "$gccnum" -ge "303"; then
           dnl gcc 3.3 and later
           WARN="$WARN -Wendif-labels -Wstrict-prototypes"
         fi

         if test "$gccnum" -ge "304"; then
           # try these on gcc 3.4
           WARN="$WARN -Wdeclaration-after-statement"
         fi

         for flag in $CPPFLAGS; do
           case "$flag" in
            -I*)
              dnl Include path, provide a -isystem option for the same dir
              dnl to prevent warnings in those dirs. The -isystem was not very
              dnl reliable on earlier gcc versions.
              add=`echo $flag | sed 's/^-I/-isystem /g'`
              WARN="$WARN $add"
              ;;
           esac
         done

       fi dnl $ICC = no

       CFLAGS="$CFLAGS $WARN"

      AC_MSG_NOTICE([Added this set of compiler options: $WARN])

    else dnl $GCC = yes

      AC_MSG_NOTICE([Added no extra compiler options])

    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 Determine the name of the library to pass to dlopen() based on the name
dnl that would normally be given to AC_CHECK_LIB.  The preprocessor symbol
dnl given is set to the quoted library file name. 
dnl The standard dynamic library file name is first generated, based on the
dnl current system type, then a search is performed for that file on the
dnl standard dynamic library path.  If it is a symbolic link, the destination
dnl of the link is used as the file name, after stripping off any minor
dnl version numbers. If a library file can't be found, a guess is made.
dnl This macro assumes AC_PROG_LIBTOOL has been called and requires perl
dnl to be available in the PATH, or $PERL to be set to its location.
dnl
dnl CURL_DLLIB_NAME(VARIABLE, library_name)
dnl e.g. CURL_DLLIB_NAME(LDAP_NAME, ldap) on a Linux system might result
dnl in LDAP_NAME holding the string "libldap.so.2".

AC_DEFUN([CURL_DLLIB_NAME],
[
AC_MSG_CHECKING([name of dynamic library $2])
dnl The shared library extension variable name changes from version to
dnl version of libtool.  Try a few names then just set one statically.
test -z "$shared_ext" && shared_ext="$shrext_cmds"
test -z "$shared_ext" && shared_ext="$shrext"
test -z "$shared_ext" && shared_ext=".so"

dnl Create the library link name of the correct form for this platform
LIBNAME_LINK_SPEC=`echo "$library_names_spec" | $SED 's/^.* //'`
DLGUESSLIB=`name=$2 eval echo "$libname_spec"`
DLGUESSFILE=`libname="$DLGUESSLIB" release="" major="" versuffix="" eval echo "$LIBNAME_LINK_SPEC"`

dnl Synthesize a likely dynamic library name in case we can't find an actual one
SO_NAME_SPEC="$soname_spec"
dnl soname_spec undefined when identical to the 1st entry in library_names_spec
test -z "$SO_NAME_SPEC" && SO_NAME_SPEC=`echo "$library_names_spec" | $SED 's/ .*$//'`
DLGUESSSOFILE=`libname="$DLGUESSLIB" release="" major="" versuffix="" eval echo "$SO_NAME_SPEC"`

if test "$cross_compiling" = yes; then
  dnl Can't look at filesystem when cross-compiling
  AC_DEFINE_UNQUOTED($1, "$DLGUESSSOFILE", [$2 dynamic library file])
  AC_MSG_RESULT([$DLGUESSSOFILE (guess while cross-compiling)])
else

  DLFOUNDFILE=""
  if test "$sys_lib_dlsearch_path_spec" ; then
    dnl Search for the link library name and see what it points to.
    for direc in $sys_lib_dlsearch_path_spec ; do
      DLTRYFILE="$direc/$DLGUESSFILE"
      dnl Find where the symbolic link for this name points
      changequote(<<, >>)dnl
      <<
      DLFOUNDFILE=`${PERL:-perl} -e 'use File::Basename; (basename(readlink($ARGV[0])) =~ /^(.*[^\d]\.\d+)[\d\.]*$/ && print ${1}) || exit 1;' "$DLTRYFILE" 2>&5`
      >>
      changequote([, ])dnl
      if test "$?" -eq "0"; then
        dnl Found the file link
        break
      fi
    done
  fi

  if test -z "$DLFOUNDFILE" ; then
    dnl Couldn't find a link library, so guess at a name.
    DLFOUNDFILE="$DLGUESSSOFILE"
  fi

  AC_DEFINE_UNQUOTED($1, "$DLFOUNDFILE", [$2 dynamic library file])
  AC_MSG_RESULT($DLFOUNDFILE)
fi
])