curl-1-fixes.patch

This file is part of mingw-cross-env.
See doc/index.html for further information.

Commits backported (cherry-picked) from upstream.
http://github.com/bagder/curl
Also contains mingw-cross-env specific fixes.

From 017b42a86ec4cac8a4cd71cc607d0a4d201ff4fd Mon Sep 17 00:00:00 2001
From: Volker Grabsch <vog@notjusthosting.com>
Date: Fri, 28 Oct 2011 13:48:04 +0200
Subject: [PATCH 1/7] static linking for mingw-cross-env

---
 include/curl/curlbuild.h.in |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/curl/curlbuild.h.in b/include/curl/curlbuild.h.in
index fe348f4..c428273 100644
--- a/include/curl/curlbuild.h.in
+++ b/include/curl/curlbuild.h.in
@@ -111,6 +111,9 @@
 /*  EXTERNAL INTERFACE SETTINGS FOR CONFIGURE CAPABLE SYSTEMS ONLY  */
 /* ================================================================ */
 
+/* Configure process defines this to 1 when static linking is requested. */
+#undef CURL_STATICLIB
+
 /* Configure process defines this to 1 when it finds out that system  */
 /* header file ws2tcpip.h must be included by the external interface. */
 #undef CURL_PULL_WS2TCPIP_H
-- 
1.7.7.3


From 1ce66d38f2696a25aeac411beaf9e291c8775fe5 Mon Sep 17 00:00:00 2001
From: Martin Storsjo <martin@martin.st>
Date: Tue, 15 Nov 2011 11:52:32 +0200
Subject: [PATCH 2/7] Add support for using nettle instead of gcrypt as gnutls
 backend (cherry picked from commit
 64f328c787ab763cc994eadd6b82f32490d37ebb)

---
 configure.ac         |   29 +++++++++++++++++++++--------
 lib/curl_ntlm_core.c |   36 +++++++++++++++++++++++++++++++++++-
 lib/curl_ntlm_msgs.c |   14 ++++++++++++++
 lib/gtls.c           |    4 ++++
 lib/md5.c            |   26 ++++++++++++++++++++++++++
 5 files changed, 100 insertions(+), 9 deletions(-)

diff --git a/configure.ac b/configure.ac
index 64ee1b7..2ba6625 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1799,17 +1799,30 @@ if test "$OPENSSL_ENABLED" != "1"; then
 fi dnl OPENSSL != 1
 
 dnl ---
-dnl If GnuTLS is enabled, we MUST verify that it uses libgcrypt since
-dnl curl code relies on that but recent GnuTLS versions can in fact build
-dnl with different crypto libraries which curl right now cannot handle
+dnl Check which crypto backend GnuTLS uses
 dnl ---
 
 if test "$GNUTLS_ENABLED" = "1"; then
-  AC_CHECK_LIB(gcrypt,
-               gcry_control, ,
-    [
-      AC_MSG_ERROR([need GnuTLS built with gcrypt to function with GnuTLS])
-    ])
+  USE_GNUTLS_NETTLE=
+  # First check if we can detect either crypto library via transitive linking
+  AC_CHECK_LIB(gnutls, nettle_MD5Init, [ USE_GNUTLS_NETTLE=1 ])
+  if test "$USE_GNUTLS_NETTLE" = ""; then
+    AC_CHECK_LIB(gnutls, gcry_control, [ USE_GNUTLS_NETTLE=0 ])
+  fi
+  # If not, try linking directly to both of them to see if they are available
+  if test "$USE_GNUTLS_NETTLE" = ""; then
+    AC_CHECK_LIB(nettle, nettle_MD5Init, [ USE_GNUTLS_NETTLE=1 ])
+  fi
+  if test "$USE_GNUTLS_NETTLE" = ""; then
+    AC_CHECK_LIB(gcrypt, gcry_control, [ USE_GNUTLS_NETTLE=0 ])
+  fi
+  if test "$USE_GNUTLS_NETTLE" = ""; then
+    AC_MSG_ERROR([GnuTLS found, but neither gcrypt nor nettle found])
+  fi
+  if test "$USE_GNUTLS_NETTLE" = "1"; then
+    AC_DEFINE(USE_GNUTLS_NETTLE, 1, [if GnuTLS uses nettle as crypto backend])
+    AC_SUBST(USE_GNUTLS_NETTLE, [1])
+  fi
 fi
 
 dnl ---
diff --git a/lib/curl_ntlm_core.c b/lib/curl_ntlm_core.c
index 0be16b4..39952d2 100644
--- a/lib/curl_ntlm_core.c
+++ b/lib/curl_ntlm_core.c
@@ -63,6 +63,11 @@
 #    define DESKEY(x) &x
 #  endif
 
+#elif defined(USE_GNUTLS_NETTLE)
+
+#  include <nettle/des.h>
+#  include <nettle/md4.h>
+
 #elif defined(USE_GNUTLS)
 
 #  include <gcrypt.h>
@@ -133,7 +138,17 @@ static void extend_key_56_to_64(const unsigned char *key_56, char *key)
   key[7] = (unsigned char) ((key_56[6] << 1) & 0xFF);
 }
 
-#if defined(USE_GNUTLS)
+#if defined(USE_GNUTLS_NETTLE)
+
+static void setup_des_key(const unsigned char *key_56,
+                          struct des_ctx *des)
+{
+  char key[8];
+  extend_key_56_to_64(key_56, key);
+  des_set_key(des, key);
+}
+
+#elif defined(USE_GNUTLS)
 
 /*
  * Turns a 56 bit key into the 64 bit, odd parity key and sets the key.
@@ -233,6 +248,14 @@ void Curl_ntlm_core_lm_resp(const unsigned char *keys,
   setup_des_key(keys + 14, DESKEY(ks));
   DES_ecb_encrypt((DES_cblock*) plaintext, (DES_cblock*) (results + 16),
                   DESKEY(ks), DES_ENCRYPT);
+#elif defined(USE_GNUTLS_NETTLE)
+  struct des_ctx des;
+  setup_des_key(keys, &des);
+  des_encrypt(&des, 8, results, plaintext);
+  setup_des_key(keys + 7, &des);
+  des_encrypt(&des, 8, results + 8, plaintext);
+  setup_des_key(keys + 14, &des);
+  des_encrypt(&des, 8, results + 16, plaintext);
 #elif defined(USE_GNUTLS)
   gcry_cipher_hd_t des;
 
@@ -295,6 +318,12 @@ void Curl_ntlm_core_mk_lm_hash(struct SessionHandle *data,
     setup_des_key(pw + 7, DESKEY(ks));
     DES_ecb_encrypt((DES_cblock *)magic, (DES_cblock *)(lmbuffer + 8),
                     DESKEY(ks), DES_ENCRYPT);
+#elif defined(USE_GNUTLS_NETTLE)
+    struct des_ctx des;
+    setup_des_key(pw, &des);
+    des_encrypt(&des, 8, lmbuffer, magic);
+    setup_des_key(pw + 7, &des);
+    des_encrypt(&des, 8, lmbuffer + 8, magic);
 #elif defined(USE_GNUTLS)
     gcry_cipher_hd_t des;
 
@@ -357,6 +386,11 @@ CURLcode Curl_ntlm_core_mk_nt_hash(struct SessionHandle *data,
     MD4_Init(&MD4pw);
     MD4_Update(&MD4pw, pw, 2 * len);
     MD4_Final(ntbuffer, &MD4pw);
+#elif defined(USE_GNUTLS_NETTLE)
+    struct md4_ctx MD4pw;
+    md4_init(&MD4pw);
+    md4_update(&MD4pw, 2 * len, pw);
+    md4_digest(&MD4pw, MD4_DIGEST_SIZE, ntbuffer);
 #elif defined(USE_GNUTLS)
     gcry_md_hd_t MD4pw;
     gcry_md_open(&MD4pw, GCRY_MD_MD4, 0);
diff --git a/lib/curl_ntlm_msgs.c b/lib/curl_ntlm_msgs.c
index bfd3e28..712c4b4 100644
--- a/lib/curl_ntlm_msgs.c
+++ b/lib/curl_ntlm_msgs.c
@@ -54,6 +54,13 @@
 #  endif
 #  include "ssluse.h"
 
+#elif defined(USE_GNUTLS_NETTLE)
+
+#  include <nettle/md5.h>
+#  include <gnutls/gnutls.h>
+#  include <gnutls/crypto.h>
+#  define MD5_DIGEST_LENGTH 16
+
 #elif defined(USE_GNUTLS)
 
 #  include <gcrypt.h>
@@ -714,6 +721,9 @@ CURLcode Curl_ntlm_create_type3_message(struct SessionHandle *data,
     MD5_CTX MD5pw;
     Curl_ossl_seed(data); /* Initiate the seed if not already done */
     RAND_bytes(entropy, 8);
+#elif defined(USE_GNUTLS_NETTLE)
+    struct md5_ctx MD5pw;
+    gnutls_rnd(GNUTLS_RND_RANDOM, entropy, 8);
 #elif defined(USE_GNUTLS)
     gcry_md_hd_t MD5pw;
     Curl_gtls_seed(data); /* Initiate the seed if not already done */
@@ -739,6 +749,10 @@ CURLcode Curl_ntlm_create_type3_message(struct SessionHandle *data,
     MD5_Init(&MD5pw);
     MD5_Update(&MD5pw, tmp, 16);
     MD5_Final(md5sum, &MD5pw);
+#elif defined(USE_GNUTLS_NETTLE)
+    md5_init(&MD5pw);
+    md5_update(&MD5pw, 16, tmp);
+    md5_digest(&MD5pw, 16, md5sum);
 #elif defined(USE_GNUTLS)
     gcry_md_open(&MD5pw, GCRY_MD_MD5, 0);
     gcry_md_write(MD5pw, tmp, MD5_DIGEST_LENGTH);
diff --git a/lib/gtls.c b/lib/gtls.c
index ed79313..a98a7e8 100644
--- a/lib/gtls.c
+++ b/lib/gtls.c
@@ -34,7 +34,9 @@
 
 #include <gnutls/gnutls.h>
 #include <gnutls/x509.h>
+#ifndef USE_GNUTLS_NETTLE
 #include <gcrypt.h>
+#endif
 
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
@@ -1032,7 +1034,9 @@ int Curl_gtls_seed(struct SessionHandle *data)
   static bool ssl_seeded = FALSE;
 
   /* Quickly add a bit of entropy */
+#ifndef USE_GNUTLS_NETTLE
   gcry_fast_random_poll();
+#endif
 
   if(!ssl_seeded || data->set.str[STRING_SSL_RANDOM_FILE] ||
      data->set.str[STRING_SSL_EGDSOCKET]) {
diff --git a/lib/md5.c b/lib/md5.c
index f26e027..cf8e053 100644
--- a/lib/md5.c
+++ b/lib/md5.c
@@ -27,6 +27,30 @@
 #include "curl_md5.h"
 #include "curl_hmac.h"
 
+#ifdef USE_GNUTLS_NETTLE
+
+#include <nettle/md5.h>
+
+typedef struct md5_ctx MD5_CTX;
+
+static void MD5_Init(MD5_CTX * ctx)
+{
+  md5_init(ctx);
+}
+
+static void MD5_Update(MD5_CTX * ctx,
+                       const unsigned char * input,
+                       unsigned int inputLen)
+{
+  md5_update(ctx, inputLen, input);
+}
+
+static void MD5_Final(unsigned char digest[16], MD5_CTX * ctx)
+{
+  md5_digest(ctx, 16, digest);
+}
+#else
+
 #ifdef USE_GNUTLS
 
 #include <gcrypt.h>
@@ -369,6 +393,8 @@ static void Decode (UINT4 *output,
 
 #endif /* USE_GNUTLS */
 
+#endif /* USE_GNUTLS_NETTLE */
+
 const HMAC_params Curl_HMAC_MD5[] = {
   {
     (HMAC_hinit_func) MD5_Init,           /* Hash initialization function. */
-- 
1.7.7.3


From 380fb5054be1ccd85a80220fafbfcb33e1010f05 Mon Sep 17 00:00:00 2001
From: Mark Brand <mabrand@mabrand.nl>
Date: Tue, 22 Nov 2011 22:48:15 +0100
Subject: [PATCH 3/7] gnutls: only translate winsock errors for old versions

Bugfix: https handshake fails using gnutls 3 on windows
http://sourceforge.net/tracker/index.php?func=detail&aid=3441084&group_id=976&atid=100976

New gnutls versions have an error handler that knows about Winsock
errors, which is why gnutls_transport_set_global_errno() was deprecated
and then removed.

This is a correction of commit f5bb370 (blame me) which meant to
reimplement gnutls_transport_set_global_errno(), which is not necessary.
(cherry picked from commit 28bac99674f199898f3e803fcfc4167a56a4c058)
---
 lib/gtls.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/gtls.c b/lib/gtls.c
index a98a7e8..c64c8c4 100644
--- a/lib/gtls.c
+++ b/lib/gtls.c
@@ -80,15 +80,17 @@ static void tls_log_func(int level, const char *str)
 #endif
 static bool gtls_inited = FALSE;
 
+#undef MAP_WINSOCK_ERRORS
 #if defined(GNUTLS_VERSION_NUMBER)
 #  if (GNUTLS_VERSION_NUMBER >= 0x020c00)
 #    undef gnutls_transport_set_lowat
 #    define gnutls_transport_set_lowat(A,B) Curl_nop_stmt
 #    define USE_GNUTLS_PRIORITY_SET_DIRECT 1
 #  endif
-#  if (GNUTLS_VERSION_NUMBER >= 0x020c03)
-#    undef gnutls_transport_set_global_errno
-#    define gnutls_transport_set_global_errno(A) SET_ERRNO((A))
+#  if (GNUTLS_VERSION_NUMBER < 0x020c03)
+#    ifdef USE_WINSOCK
+#      define MAP_WINSOCK_ERRORS
+#    endif
 #  endif
 #endif
 
@@ -100,6 +102,7 @@ static bool gtls_inited = FALSE;
  * us to get specific about the fourth "flags" argument, and to use arbitrary
  * private data with gnutls_transport_set_ptr if we wish.
  *
+ * For old gnutls versions, curl must translate Winsock errors:
  * When these custom push and pull callbacks fail, GNU TLS checks its own
  * session-specific error variable, and when not set also its own global
  * errno variable, in order to take appropriate action. GNU TLS does not
@@ -111,7 +114,7 @@ static bool gtls_inited = FALSE;
  * error translation must take place in these callbacks.
  */
 
-#ifdef USE_WINSOCK
+#ifdef MAP_WINSOCK_ERRORS
 #  define gtls_EINTR  4
 #  define gtls_EIO    5
 #  define gtls_EAGAIN 11
@@ -132,7 +135,7 @@ static int gtls_mapped_sockerrno(void)
 static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
 {
   ssize_t ret = swrite(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
-#ifdef USE_WINSOCK
+#ifdef MAP_WINSOCK_ERRORS
   if(ret < 0)
     gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
 #endif
@@ -142,7 +145,7 @@ static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
 static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
 {
   ssize_t ret = sread(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
-#ifdef USE_WINSOCK
+#ifdef MAP_WINSOCK_ERRORS
   if(ret < 0)
     gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
 #endif
-- 
1.7.7.3


From 53b8a80e2e1d3a9a51ed461210a5244abdb0edfb Mon Sep 17 00:00:00 2001
From: Yang Tse <yangsita@gmail.com>
Date: Thu, 24 Nov 2011 12:11:52 +0100
Subject: [PATCH 4/7] Fix unreleased regression when using windows gnutls
 versions older than 2.8 (cherry picked from commit
 78feaff9d800efb5d1f97f8653721718a6cf00c8)

---
 lib/gtls.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/lib/gtls.c b/lib/gtls.c
index c64c8c4..a2e8d99 100644
--- a/lib/gtls.c
+++ b/lib/gtls.c
@@ -80,17 +80,14 @@ static void tls_log_func(int level, const char *str)
 #endif
 static bool gtls_inited = FALSE;
 
-#undef MAP_WINSOCK_ERRORS
 #if defined(GNUTLS_VERSION_NUMBER)
 #  if (GNUTLS_VERSION_NUMBER >= 0x020c00)
 #    undef gnutls_transport_set_lowat
 #    define gnutls_transport_set_lowat(A,B) Curl_nop_stmt
 #    define USE_GNUTLS_PRIORITY_SET_DIRECT 1
 #  endif
-#  if (GNUTLS_VERSION_NUMBER < 0x020c03)
-#    ifdef USE_WINSOCK
-#      define MAP_WINSOCK_ERRORS
-#    endif
+#  if (GNUTLS_VERSION_NUMBER >= 0x020c03)
+#    define GNUTLS_MAPS_WINSOCK_ERRORS 1
 #  endif
 #endif
 
@@ -102,7 +99,6 @@ static bool gtls_inited = FALSE;
  * us to get specific about the fourth "flags" argument, and to use arbitrary
  * private data with gnutls_transport_set_ptr if we wish.
  *
- * For old gnutls versions, curl must translate Winsock errors:
  * When these custom push and pull callbacks fail, GNU TLS checks its own
  * session-specific error variable, and when not set also its own global
  * errno variable, in order to take appropriate action. GNU TLS does not
@@ -112,9 +108,13 @@ static bool gtls_inited = FALSE;
  * resort global errno variable using gnutls_transport_set_global_errno,
  * with a transport agnostic error value. This implies that some winsock
  * error translation must take place in these callbacks.
+ *
+ * Paragraph above applies to GNU TLS versions older than 2.12.3, since
+ * this version GNU TLS does its own internal winsock error translation
+ * using system_errno() function.
  */
 
-#ifdef MAP_WINSOCK_ERRORS
+#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
 #  define gtls_EINTR  4
 #  define gtls_EIO    5
 #  define gtls_EAGAIN 11
@@ -135,7 +135,7 @@ static int gtls_mapped_sockerrno(void)
 static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
 {
   ssize_t ret = swrite(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
-#ifdef MAP_WINSOCK_ERRORS
+#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
   if(ret < 0)
     gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
 #endif
@@ -145,7 +145,7 @@ static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
 static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
 {
   ssize_t ret = sread(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
-#ifdef MAP_WINSOCK_ERRORS
+#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
   if(ret < 0)
     gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
 #endif
-- 
1.7.7.3


From 8cd4aa2718f67e50a72bb34c9d8ede803c86b287 Mon Sep 17 00:00:00 2001
From: Mark Brand <mabrand@mabrand.nl>
Date: Fri, 25 Nov 2011 23:00:16 +0100
Subject: [PATCH 5/7] configure: add support for pkg-config detection of
 libidn (cherry picked from commit
 874855b743bd7e9bbbaebe2834dd281d2b2cea80)

---
 configure.ac |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2ba6625..52158f1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2377,6 +2377,15 @@ case "$LIBIDN" in
        fi
 
        if test "x$idn" != "xyes"; then
+         dnl check with pkg-config
+         PKG_CHECK_MODULES(LIBIDN_PC, libidn >= 0.0.0, [idn=yes], [idn=no])
+         if test "x$idn" = "xyes"; then
+            LIBS="$LIBS $LIBIDN_PC_LIBS"
+            CPPFLAGS="$CPPFLAGS $LIBIDN_PC_CFLAGS"
+         fi
+       fi
+
+       if test "x$idn" != "xyes"; then
           dnl check with default paths
           idn="yes"
           AC_CHECK_LIB(idn, idna_to_ascii_lz, ,
-- 
1.7.7.3


From e5d7e688946a01c4c24568981fa7252aadf818b4 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 27 Nov 2011 20:00:30 +0100
Subject: [PATCH 6/7] configure: fix to make older pkg-config play well

configure.ac:1349: error: possibly undefined macro: PKG_CONFIG_LIBDIR

Obviously this is not a problem with pkg-config 0.26 but older versions
seem to show this.

Fix suggested by: Kamil Dudka
Reported by: Guenter
Bug: http://curl.haxx.se/mail/lib-2011-11/0298.html
(cherry picked from commit 11e52ef0a157acd6a6711b7635cda50467e606ae)
---
 configure.ac |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 52158f1..7d2c7e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2377,6 +2377,10 @@ case "$LIBIDN" in
        fi
 
        if test "x$idn" != "xyes"; then
+
+         dnl to prevent errors with pkg-config < 0.26
+         m4_pattern_allow(PKG_CONFIG_LIBDIR)
+
          dnl check with pkg-config
          PKG_CHECK_MODULES(LIBIDN_PC, libidn >= 0.0.0, [idn=yes], [idn=no])
          if test "x$idn" = "xyes"; then
-- 
1.7.7.3


From 69772182aa9e08e39f42d17abb5af553b493a90c Mon Sep 17 00:00:00 2001
From: Yang Tse <yangsita@gmail.com>
Date: Tue, 29 Nov 2011 19:11:34 +0100
Subject: [PATCH 7/7] configure: avoid usage of macro PKG_CHECK_MODULES

libidn option adjusted in order to use pkg-config info when available
in a similar way as we already do for other libraries.
(cherry picked from commit f80a508297e7ece911bbb833436985070e17e6a8)
---
 configure.ac |  183 +++++++++++++++++++++++++++++++++++++++++----------------
 1 files changed, 131 insertions(+), 52 deletions(-)

diff --git a/configure.ac b/configure.ac
index 7d2c7e4..94cdd83 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2349,64 +2349,143 @@ dnl Check for the presence of IDN libraries and headers
 dnl **********************************************************************
 
 AC_MSG_CHECKING([whether to build with libidn])
+OPT_IDN="default"
 AC_ARG_WITH(libidn,
 AC_HELP_STRING([--with-libidn=PATH],[Enable libidn usage])
 AC_HELP_STRING([--without-libidn],[Disable libidn usage]),
-  [LIBIDN="$withval"])
-
-case "$LIBIDN" in
+  [OPT_IDN=$withval])
+case "$OPT_IDN" in
   no)
-       AC_MSG_RESULT(no)
-       ;;
-  *)   AC_MSG_RESULT(yes)
-
-       idn=""
-       dnl if there is a given path, check that FIRST
-       if test -n "$LIBIDN"; then
-         if test "x$LIBIDN" != "xyes"; then
-            oldLDFLAGS=$LDFLAGS
-            oldCPPFLAGS=$CPPFLAGS
-            LDFLAGS="$LDFLAGS -L$LIBIDN/lib"
-            CPPFLAGS="$CPPFLAGS -I$LIBIDN/include"
-            idn="yes"
-            AC_CHECK_LIB(idn, idna_to_ascii_4i, ,
-                         idn=""
-                         LDFLAGS=$oldLDFLAGS
-                         CPPFLAGS=$oldCPPFLAGS)
-         fi
-       fi
-
-       if test "x$idn" != "xyes"; then
-
-         dnl to prevent errors with pkg-config < 0.26
-         m4_pattern_allow(PKG_CONFIG_LIBDIR)
-
-         dnl check with pkg-config
-         PKG_CHECK_MODULES(LIBIDN_PC, libidn >= 0.0.0, [idn=yes], [idn=no])
-         if test "x$idn" = "xyes"; then
-            LIBS="$LIBS $LIBIDN_PC_LIBS"
-            CPPFLAGS="$CPPFLAGS $LIBIDN_PC_CFLAGS"
-         fi
-       fi
-
-       if test "x$idn" != "xyes"; then
-          dnl check with default paths
-          idn="yes"
-          AC_CHECK_LIB(idn, idna_to_ascii_lz, ,
-                       idn="")
-       fi
-
-       if test "x$idn" = "xyes"; then
-         curl_idn_msg="enabled"
-         AC_SUBST(IDN_ENABLED, [1])
-         dnl different versions of libidn have different setups of these:
-         AC_CHECK_FUNCS( idn_free idna_strerror tld_strerror)
-         AC_CHECK_HEADERS( idn-free.h tld.h )
-       fi
-
-       ;;
+    dnl --without-libidn option used
+    want_idn="no"
+    AC_MSG_RESULT([no])
+    ;;
+  default)
+    dnl configure option not specified
+    want_idn="yes"
+    want_idn_path="default"
+    AC_MSG_RESULT([(assumed) yes])
+    ;;
+  yes)
+    dnl --with-libidn option used without path
+    want_idn="yes"
+    want_idn_path="default"
+    AC_MSG_RESULT([yes])
+    ;;
+  *)
+    dnl --with-libidn option used with path
+    want_idn="yes"
+    want_idn_path="$withval"
+    AC_MSG_RESULT([yes ($withval)])
+    ;;
 esac
 
+if test "$want_idn" = "yes"; then
+  dnl idn library support has been requested
+  clean_CPPFLAGS="$CPPFLAGS"
+  clean_LDFLAGS="$LDFLAGS"
+  clean_LIBS="$LIBS"
+  PKGCONFIG="no"
+  #
+  if test "$want_idn_path" != "default"; then
+    dnl path has been specified
+    IDN_PCDIR="$want_idn_path/lib$libsuff/pkgconfig"
+    CURL_CHECK_PKGCONFIG(libidn, [$IDN_PCDIR])
+    if test "$PKGCONFIG" != "no"; then
+      IDN_LIBS=`CURL_EXPORT_PCDIR([$IDN_PCDIR]) dnl
+        $PKGCONFIG --libs-only-l libidn 2>/dev/null`
+      IDN_LDFLAGS=`CURL_EXPORT_PCDIR([$IDN_PCDIR]) dnl
+        $PKGCONFIG --libs-only-L libidn 2>/dev/null`
+      IDN_CPPFLAGS=`CURL_EXPORT_PCDIR([$IDN_PCDIR]) dnl
+        $PKGCONFIG --cflags-only-I libidn 2>/dev/null`
+      IDN_DIR=`echo $IDN_LDFLAGS | $SED -e 's/-L//'`
+    else
+      dnl pkg-config not available or provides no info
+      IDN_LIBS="-lidn"
+      IDN_LDFLAGS="-L$want_idn_path/lib$libsuff"
+      IDN_CPPFLAGS="-I$want_idn_path/include"
+      IDN_DIR="$want_idn_path/lib$libsuff"
+    fi
+  else
+    dnl path not specified
+    CURL_CHECK_PKGCONFIG(libidn)
+    if test "$PKGCONFIG" != "no"; then
+      IDN_LIBS=`$PKGCONFIG --libs-only-l libidn 2>/dev/null`
+      IDN_LDFLAGS=`$PKGCONFIG --libs-only-L libidn 2>/dev/null`
+      IDN_CPPFLAGS=`$PKGCONFIG --cflags-only-I libidn 2>/dev/null`
+      IDN_DIR=`echo $IDN_LDFLAGS | $SED -e 's/-L//'`
+    else
+      dnl pkg-config not available or provides no info
+      IDN_LIBS="-lidn"
+    fi
+  fi
+  #
+  if test "$PKGCONFIG" != "no"; then
+    AC_MSG_NOTICE([pkg-config: IDN_LIBS: "$IDN_LIBS"])
+    AC_MSG_NOTICE([pkg-config: IDN_LDFLAGS: "$IDN_LDFLAGS"])
+    AC_MSG_NOTICE([pkg-config: IDN_CPPFLAGS: "$IDN_CPPFLAGS"])
+    AC_MSG_NOTICE([pkg-config: IDN_DIR: "$IDN_DIR"])
+  else
+    AC_MSG_NOTICE([IDN_LIBS: "$IDN_LIBS"])
+    AC_MSG_NOTICE([IDN_LDFLAGS: "$IDN_LDFLAGS"])
+    AC_MSG_NOTICE([IDN_CPPFLAGS: "$IDN_CPPFLAGS"])
+    AC_MSG_NOTICE([IDN_DIR: "$IDN_DIR"])
+  fi
+  #
+  CPPFLAGS="$IDN_CPPFLAGS $CPPFLAGS"
+  LDFLAGS="$IDN_LDFLAGS $LDFLAGS"
+  LIBS="$IDN_LIBS $LIBS"
+  #
+  AC_MSG_CHECKING([if idna_to_ascii_4i can be linked])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([idna_to_ascii_4i])
+  ],[
+    AC_MSG_RESULT([yes])
+    tst_links_libidn="yes"
+  ],[
+    AC_MSG_RESULT([no])
+    tst_links_libidn="no"
+  ])
+  if test "$tst_links_libidn" = "no"; then
+    AC_MSG_CHECKING([if idna_to_ascii_lz can be linked])
+    AC_LINK_IFELSE([
+      AC_LANG_FUNC_LINK_TRY([idna_to_ascii_lz])
+    ],[
+      AC_MSG_RESULT([yes])
+      tst_links_libidn="yes"
+    ],[
+      AC_MSG_RESULT([no])
+      tst_links_libidn="no"
+    ])
+  fi
+  #
+  if test "$tst_links_libidn" = "yes"; then
+    AC_DEFINE(HAVE_LIBIDN, 1, [Define to 1 if you have the `idn' library (-lidn).])
+    dnl different versions of libidn have different setups of these:
+    AC_CHECK_FUNCS( idn_free idna_strerror tld_strerror )
+    AC_CHECK_HEADERS( idn-free.h tld.h )
+    if test "x$ac_cv_header_tld_h" = "xyes"; then
+      AC_SUBST([IDN_ENABLED], [1])
+      curl_idn_msg="enabled"
+      if test -n "$IDN_DIR"; then
+        LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$IDN_DIR"
+        export LD_LIBRARY_PATH
+        AC_MSG_NOTICE([Added $IDN_DIR to LD_LIBRARY_PATH])
+      fi
+    else
+      AC_MSG_WARN([Libraries for IDN support too old: IDN disabled])
+      CPPFLAGS="$clean_CPPFLAGS"
+      LDFLAGS="$clean_LDFLAGS"
+      LIBS="$clean_LIBS"
+    fi
+  else
+    AC_MSG_WARN([Cannot find libraries for IDN support: IDN disabled])
+    CPPFLAGS="$clean_CPPFLAGS"
+    LDFLAGS="$clean_LDFLAGS"
+    LIBS="$clean_LIBS"
+  fi
+fi
+
 
 dnl Let's hope this split URL remains working:
 dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \
-- 
1.7.7.3