[Buildroot] [PATCH 1/1] libcurl: fix building against libressl

[Adam Duskett <aduskett@gmail.com>]

LibreSSL 2.7.x breaks libcurl 7.59.0 with the error:
error: static declaration of ?OpenSSL_version_num? follows non-static
declaration

This failure has since been fixed upstream with commit:
https://github.com/curl/curl/commit/7c90c93c0b061da81f69fabdd57125b2783c15fb

Signed-off-by: Adam Duskett <aduskett@gmail.com>
---
 ...-curl-fix-building-against-libressl-2.7.2.patch | 91 ++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 package/libcurl/0001-curl-fix-building-against-libressl-2.7.2.patch

diff --git a/package/libcurl/0001-curl-fix-building-against-libressl-2.7.2.patch b/package/libcurl/0001-curl-fix-building-against-libressl-2.7.2.patch
new file mode 100644
index 0000000000..e5d6f686e8
--- /dev/null
+++ b/package/libcurl/0001-curl-fix-building-against-libressl-2.7.2.patch
@@ -0,0 +1,91 @@
+From 7a67b6561da8e42505e09014a5c97b19e1a93532 Mon Sep 17 00:00:00 2001
+From: Adam Duskett <aduskett@gmail.com>
+Date: Fri, 13 Apr 2018 08:31:37 -0400
+Subject: [PATCH] curl: fix building against libressl 2.7.2
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+LibreSSL 2.7.x breaks libcurl 7.59.0 with the error:
+error: static declaration of ?OpenSSL_version_num? follows non-static
+declaration
+
+This failure has since been fixed upstream with commit:
+https://github.com/curl/curl/commit/7c90c93c0b061da81f69fabdd57125b2783c15fb
+
+Signed-off-by: Adam Duskett <aduskett@gmail.com>
+---
+ lib/vtls/openssl.c | 23 +++++++++++++++++------
+ 1 file changed, 17 insertions(+), 6 deletions(-)
+
+diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
+index 2a6b3cf..09b4ea6 100644
+--- a/lib/vtls/openssl.c
++++ b/lib/vtls/openssl.c
+@@ -104,13 +104,22 @@
+ #endif
+ 
+ #if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && /* OpenSSL 1.1.0+ */ \
+-  !defined(LIBRESSL_VERSION_NUMBER)
++    !(defined(LIBRESSL_VERSION_NUMBER) && \
++      LIBRESSL_VERSION_NUMBER < 0x20700000L)
+ #define SSLEAY_VERSION_NUMBER OPENSSL_VERSION_NUMBER
+ #define HAVE_X509_GET0_EXTENSIONS 1 /* added in 1.1.0 -pre1 */
+ #define HAVE_OPAQUE_EVP_PKEY 1 /* since 1.1.0 -pre3 */
+ #define HAVE_OPAQUE_RSA_DSA_DH 1 /* since 1.1.0 -pre5 */
+ #define CONST_EXTS const
+ #define HAVE_ERR_REMOVE_THREAD_STATE_DEPRECATED 1
++
++/* funny typecast define due to difference in API */
++#ifdef LIBRESSL_VERSION_NUMBER
++#define ARG2_X509_signature_print (X509_ALGOR *)
++#else
++#define ARG2_X509_signature_print
++#endif
++
+ #else
+ /* For OpenSSL before 1.1.0 */
+ #define ASN1_STRING_get0_data(x) ASN1_STRING_data(x)
+@@ -128,7 +137,8 @@ static unsigned long OpenSSL_version_num(void)
+ #endif
+ 
+ #if (OPENSSL_VERSION_NUMBER >= 0x1000200fL) && /* 1.0.2 or later */ \
+-  !defined(LIBRESSL_VERSION_NUMBER)
++    !(defined(LIBRESSL_VERSION_NUMBER) && \
++      LIBRESSL_VERSION_NUMBER < 0x20700000L)
+ #define HAVE_X509_GET0_SIGNATURE 1
+ #endif
+ 
+@@ -147,7 +157,7 @@ static unsigned long OpenSSL_version_num(void)
+  * Whether SSL_CTX_set_keylog_callback is available.
+  * OpenSSL: supported since 1.1.1 https://github.com/openssl/openssl/pull/2287
+  * BoringSSL: supported since d28f59c27bac (committed 2015-11-19)
+- * LibreSSL: unsupported in at least 2.5.1 (explicitly check for it since it
++ * LibreSSL: unsupported in@least 2.7.2 (explicitly check for it since it
+  *           lies and pretends to be OpenSSL 2.0.0).
+  */
+ #if (OPENSSL_VERSION_NUMBER >= 0x10101000L && \
+@@ -259,7 +269,9 @@ static void tap_ssl_key(const SSL *ssl, ssl_tap_state_t *state)
+   if(!session || !keylog_file_fp)
+     return;
+ 
+-#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
++#if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
++    !(defined(LIBRESSL_VERSION_NUMBER) && \
++      LIBRESSL_VERSION_NUMBER < 0x20700000L)
+   /* ssl->s3 is not checked in openssl 1.1.0-pre6, but let's assume that
+    * we have a valid SSL context if we have a non-NULL session. */
+   SSL_get_client_random(ssl, client_random, SSL3_RANDOM_SIZE);
+@@ -2082,8 +2094,7 @@ static CURLcode ossl_connect_step1(struct connectdata *conn, int sockindex)
+   case CURL_SSLVERSION_TLSv1_2:
+   case CURL_SSLVERSION_TLSv1_3:
+     /* it will be handled later with the context options */
+-#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && \
+-    !defined(LIBRESSL_VERSION_NUMBER)
++#if (OPENSSL_VERSION_NUMBER >= 0x10100000L)
+     req_method = TLS_client_method();
+ #else
+     req_method = SSLv23_client_method();
+-- 
+2.14.3
+
-- 
2.14.3