acinclude.m4

      AC_DEFINE(HAVE_POSIX_STRERROR_R, 1, [we have a POSIX-style strerror_r()])
      AC_MSG_RESULT([yes]),
      AC_MSG_RESULT([no]) ,
      dnl cross-compiling!
      AC_MSG_NOTICE([cannot determine strerror_r() style: edit lib/config.h manually!])
    )

    fi dnl if not using glibc API

  fi dnl we have a strerror_r

])

AC_DEFUN([CURL_CHECK_INET_NTOA_R],
[
  dnl determine if function definition for inet_ntoa_r exists.
  AC_CHECK_FUNCS(inet_ntoa_r,[
    AC_MSG_CHECKING(whether inet_ntoa_r is declared)
    AC_EGREP_CPP(inet_ntoa_r,[
#include <arpa/inet.h>],[
      AC_DEFINE(HAVE_INET_NTOA_R_DECL, 1, [inet_ntoa_r() is declared])
      AC_MSG_RESULT(yes)],[
      AC_MSG_RESULT(no)
      AC_MSG_CHECKING(whether inet_ntoa_r with -D_REENTRANT is declared)
      AC_EGREP_CPP(inet_ntoa_r,[
#define _REENTRANT
#include <arpa/inet.h>],[
	AC_DEFINE(HAVE_INET_NTOA_R_DECL, 1, [inet_ntoa_r() is declared])
	AC_DEFINE(NEED_REENTRANT, 1, [need REENTRANT defined])
	AC_MSG_RESULT(yes)],
	AC_MSG_RESULT(no))])])
])

AC_DEFUN([CURL_CHECK_GETHOSTBYADDR_R],
[
  dnl check for number of arguments to gethostbyaddr_r. it might take
  dnl either 5, 7, or 8 arguments.
  AC_CHECK_FUNCS(gethostbyaddr_r,[
    AC_MSG_CHECKING(if gethostbyaddr_r takes 5 arguments)
    AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
struct hostent_data hdata;
int rc;
rc = gethostbyaddr_r(address, length, type, &h, &hdata);],[
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_GETHOSTBYADDR_R_5, 1, [gethostbyaddr_r() takes 5 args])
      ac_cv_gethostbyaddr_args=5],[
      AC_MSG_RESULT(no)
      AC_MSG_CHECKING(if gethostbyaddr_r with -D_REENTRANT takes 5 arguments)
      AC_TRY_COMPILE([
#define _REENTRANT
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
struct hostent_data hdata;
int rc;
rc = gethostbyaddr_r(address, length, type, &h, &hdata);],[
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_GETHOSTBYADDR_R_5, 1, [gethostbyaddr_r() takes 5 args])
	AC_DEFINE(NEED_REENTRANT, 1, [need REENTRANT])
	ac_cv_gethostbyaddr_args=5],[
	AC_MSG_RESULT(no)
	AC_MSG_CHECKING(if gethostbyaddr_r takes 7 arguments)
	AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
char buffer[8192];
int h_errnop;
struct hostent * hp;

hp = gethostbyaddr_r(address, length, type, &h,
                     buffer, 8192, &h_errnop);],[
	  AC_MSG_RESULT(yes)
	  AC_DEFINE(HAVE_GETHOSTBYADDR_R_7, 1, [gethostbyaddr_r() takes 7 args] )
	  ac_cv_gethostbyaddr_args=7],[
	  AC_MSG_RESULT(no)
	  AC_MSG_CHECKING(if gethostbyaddr_r takes 8 arguments)
	  AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>],[
char * address;
int length;
int type;
struct hostent h;
char buffer[8192];
int h_errnop;
struct hostent * hp;
int rc;

rc = gethostbyaddr_r(address, length, type, &h,
                     buffer, 8192, &hp, &h_errnop);],[
	    AC_MSG_RESULT(yes)
	    AC_DEFINE(HAVE_GETHOSTBYADDR_R_8, 1, [gethostbyaddr_r() takes 8 args])
	    ac_cv_gethostbyaddr_args=8],[
	    AC_MSG_RESULT(no)
	    have_missing_r_funcs="$have_missing_r_funcs gethostbyaddr_r"])])])])])
])

AC_DEFUN([CURL_CHECK_GETHOSTBYNAME_R],
[
  dnl check for number of arguments to gethostbyname_r. it might take
  dnl either 3, 5, or 6 arguments.
  AC_CHECK_FUNCS(gethostbyname_r,[
    AC_MSG_CHECKING([if gethostbyname_r takes 3 arguments])
    AC_TRY_COMPILE([
#include <string.h>
#include <sys/types.h>
#include <netdb.h>
#undef NULL
#define NULL (void *)0

int
gethostbyname_r(const char *, struct hostent *, struct hostent_data *);],[
struct hostent_data data;
gethostbyname_r(NULL, NULL, NULL);],[
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_GETHOSTBYNAME_R_3, 1, [gethostbyname_r() takes 3 args])
      ac_cv_gethostbyname_args=3],[
      AC_MSG_RESULT(no)
      AC_MSG_CHECKING([if gethostbyname_r with -D_REENTRANT takes 3 arguments])
      AC_TRY_COMPILE([
#define _REENTRANT

#include <string.h>
#include <sys/types.h>
#include <netdb.h>
#undef NULL
#define NULL (void *)0

int
gethostbyname_r(const char *,struct hostent *, struct hostent_data *);],[
struct hostent_data data;
gethostbyname_r(NULL, NULL, NULL);],[
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_GETHOSTBYNAME_R_3, 1, [gethostbyname_r() takes 3 args])
	AC_DEFINE(NEED_REENTRANT, 1, [needs REENTRANT])
	ac_cv_gethostbyname_args=3],[
	AC_MSG_RESULT(no)
	AC_MSG_CHECKING([if gethostbyname_r takes 5 arguments])
	AC_TRY_COMPILE([
#include <sys/types.h>
#include <netdb.h>
#undef NULL
#define NULL (void *)0

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 **********************************************************************
dnl CURL_DETECT_ICC ([ACTION-IF-YES])
dnl
dnl check if this is the Intel ICC compiler, and if so run the ACTION-IF-YES
dnl sets the $ICC variable to "yes" or "no"
dnl **********************************************************************
AC_DEFUN([CURL_DETECT_ICC],
[
    ICC="no"
    AC_MSG_CHECKING([for icc in use])
    if test "$GCC" = "yes"; then
       dnl check if this is icc acting as gcc 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",
         dnl the text was not found, it was replaced by the cpp
         ICC="yes"
         AC_MSG_RESULT([yes])
         [$1]
       )
    fi
    if test "$ICC" = "no"; then
        # this is not ICC
        AC_MSG_RESULT([no])
    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 "z$ICC" = "z"; then
      CURL_DETECT_ICC
    fi

    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)

       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 -Wshadow -Wno-multichar"
         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()

# This is only a temporary fix. This macro is here to replace the broken one
# delivered by the automake project (including the 1.9.6 release). As soon as
# they ship a working version we SHOULD remove this work-around.

AC_DEFUN([AM_MISSING_HAS_RUN],
[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
test x"${MISSING+set}" = xset || MISSING="\${SHELL} \"$am_aux_dir/missing\""
# Use eval to expand $SHELL
if eval "$MISSING --run true"; then
  am_missing_run="$MISSING --run "
else
  am_missing_run=
  AC_MSG_WARN([`missing' script is too old or missing])
fi
])


dnl CURL_VERIFY_RUNTIMELIBS
dnl -------------------------------------------------
dnl Verify that the shared libs found so far can be used when running
dnl programs, since otherwise the situation will create odd configure errors
dnl that are misleading people.
dnl
dnl Make sure this test is run BEFORE the first test in the script that
dnl runs anything, which at the time of this writing is the AC_CHECK_SIZEOF
dnl macro. It must also run AFTER all lib-checking macros are complete.

AC_DEFUN([CURL_VERIFY_RUNTIMELIBS], [

  dnl this test is of course not sensible if we are cross-compiling!
  if test "x$cross_compiling" != xyes; then

    dnl just run a program to verify that the libs checked for previous to this
    dnl point also is available run-time!
    AC_MSG_CHECKING([run-time libs availability])
    AC_TRY_RUN([
main()
{
  return 0;
}
],
    AC_MSG_RESULT([fine]),
    AC_MSG_RESULT([failed])
    AC_MSG_ERROR([one or more libs available at link-time are not available run-time. Libs used at link-time: $LIBS])
    )

    dnl if this test fails, configure has already stopped
  fi
])


dnl CURL_CHECK_VARIADIC_MACROS
dnl -------------------------------------------------
dnl Check compiler support of variadic macros

AC_DEFUN([CURL_CHECK_VARIADIC_MACROS], [
  AC_CACHE_CHECK([for compiler support of C99 variadic macro style],
    [curl_cv_variadic_macros_c99], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([
#define c99_vmacro3(first, ...) fun3(first, __VA_ARGS__)
#define c99_vmacro2(first, ...) fun2(first, __VA_ARGS__)
        int fun3(int arg1, int arg2, int arg3);
        int fun2(int arg1, int arg2);
        int fun3(int arg1, int arg2, int arg3)
        { return arg1 + arg2 + arg3; }
        int fun2(int arg1, int arg2)
        { return arg1 + arg2; }
      ],[
        int res3 = c99_vmacro3(1, 2, 3);
        int res2 = c99_vmacro2(1, 2);
      ])
    ],[
      curl_cv_variadic_macros_c99="yes"
    ],[
      curl_cv_variadic_macros_c99="no"
    ])
  ])
  case "$curl_cv_variadic_macros_c99" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_VARIADIC_MACROS_C99, 1,
        [Define to 1 if compiler supports C99 variadic macro style.])
      ;;
  esac
  AC_CACHE_CHECK([for compiler support of old gcc variadic macro style],
    [curl_cv_variadic_macros_gcc], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([
#define gcc_vmacro3(first, args...) fun3(first, args)
#define gcc_vmacro2(first, args...) fun2(first, args)
        int fun3(int arg1, int arg2, int arg3);
        int fun2(int arg1, int arg2);
        int fun3(int arg1, int arg2, int arg3)
        { return arg1 + arg2 + arg3; }
        int fun2(int arg1, int arg2)
        { return arg1 + arg2; }
      ],[
        int res3 = gcc_vmacro3(1, 2, 3);
        int res2 = gcc_vmacro2(1, 2);
      ])
    ],[
      curl_cv_variadic_macros_gcc="yes"
    ],[
      curl_cv_variadic_macros_gcc="no"
    ])
  ])
  case "$curl_cv_variadic_macros_gcc" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_VARIADIC_MACROS_GCC, 1,
        [Define to 1 if compiler supports old gcc variadic macro style.])
      ;;
  esac
])


dnl CURL_CHECK_NATIVE_WINDOWS
dnl -------------------------------------------------
dnl Check if building a native Windows target

AC_DEFUN([CURL_CHECK_NATIVE_WINDOWS], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([whether build target is a native Windows one], [ac_cv_native_windows], [
    if test "$ac_cv_header_windows_h" = "no"; then
      ac_cv_native_windows="no"
    else
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([
        ],[
#ifdef __MINGW32__
          int dummy=1;
#else
          Not a native Windows build target.
#endif
        ])
      ],[
        ac_cv_native_windows="yes"
      ],[
        ac_cv_native_windows="no"
      ])
    fi
  ])
  case "$ac_cv_native_windows" in
    yes)
      AC_DEFINE_UNQUOTED(NATIVE_WINDOWS, 1,
        [Define to 1 if you are building a native Windows target.])
      ;;
  esac
])