[Buildroot] [PATCH v4 3/3] package/drogon: new package

Dario Binacchi <[email protected]>
Newsgroups net.busybox.buildroot
Message-ID <[email protected]> 
Drogon is a C++17/20 based HTTP application framework. It can be used to
easily build various types of web application server programs using C++.

Project page: https://github.com/drogonframework/drogon

Signed-off-by: Dario Binacchi <[email protected]>

---

Changes v3 -> v4:
- Add dependency on BR2_USE_MMU for libuuid
- Update version to 1.9.13.
- Add hash file for drogon-v1.9.13-git4.tar.gz and LICENSE.
- Drop patches already merged in version v1.9.13
- Fix typo EXMPLES -> EXAMPLES
- Fix building failure on SPARC/SPARC64

Changes v2 -> v3:
- The PRs related to the patches have all been merged. The first PR was
  merged by combining the three patches into a single one. Replace all
  Upstream: links with the link to the final commit.
- Add help text to the added KConfig options.
- Select external libraries for BROTLI and YAML_CONFIG options.
- Drop the host configurations. Files too.
- Always add -DBUILD_CTL=ON to HOST_DROGON_CONF_OPTS (together with
  -DBUILD_TESTS=OFF and -DBUILD_EXAMPLES=OFF).

Changes v1 -> v2:
- Drop BR2_ARCH_IS_64 dependency. It has been tested on imx6ull platform.
- Add DROGON_INSTALL_STAGING
- Add 0004-Fix-building-error-for-Werror-unused-value.patch for trantor
  submodule.

 DEVELOPERS                                    |  1 +
 package/Config.in                             |  1 +
 ...OLLRDHUP-mismatch-on-Linux-SPARC-SPA.patch | 93 +++++++++++++++++++
 package/drogon/Config.in                      | 52 +++++++++++
 package/drogon/drogon.hash                    |  3 +
 package/drogon/drogon.mk                      | 63 +++++++++++++
 6 files changed, 213 insertions(+)
 create mode 100644 package/drogon/0001-Fix-EPOLLRDHUP-POLLRDHUP-mismatch-on-Linux-SPARC-SPA.patch
 create mode 100644 package/drogon/Config.in
 create mode 100644 package/drogon/drogon.hash
 create mode 100644 package/drogon/drogon.mk

diff --git a/DEVELOPERS b/DEVELOPERS
index 75fcdbef2ee7..9057629b46db 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -816,6 +816,7 @@ F:	package/babeld/
 F:	package/bc/
 F:	package/cmocka/
 F:	package/connman/
+F:	package/drogon/
 F:	package/empty/
 F:	package/iana-assignments/
 F:	package/inih/
diff --git a/package/Config.in b/package/Config.in
index 015f635ad16c..acb9b49273e3 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -1991,6 +1991,7 @@ menu "Networking"
 	source "package/davici/Config.in"
 	source "package/dht/Config.in"
 	source "package/dpdk/Config.in"
+	source "package/drogon/Config.in"
 	source "package/enet/Config.in"
 	source "package/filemq/Config.in"
 	source "package/fmlib/Config.in"
diff --git a/package/drogon/0001-Fix-EPOLLRDHUP-POLLRDHUP-mismatch-on-Linux-SPARC-SPA.patch b/package/drogon/0001-Fix-EPOLLRDHUP-POLLRDHUP-mismatch-on-Linux-SPARC-SPA.patch
new file mode 100644
index 000000000000..7a9fab389fec
--- /dev/null
+++ b/package/drogon/0001-Fix-EPOLLRDHUP-POLLRDHUP-mismatch-on-Linux-SPARC-SPA.patch
@@ -0,0 +1,93 @@
+From 9ecfb965e6ea02583874e534f8936ebb43a9db29 Mon Sep 17 00:00:00 2001
+From: Dario Binacchi <[email protected]>
+Date: Mon, 20 Jul 2026 16:16:22 +0200
+Subject: [PATCH] Fix EPOLLRDHUP/POLLRDHUP mismatch on Linux SPARC/SPARC64
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Fix a build failure reported by Buildroot autobuild for the
+bootlin-sparc64-glibc configuration:
+
+  EpollPoller.cc:41:26: error: static assertion failed:
+  EPOLLRDHUP != POLLRDHUP
+
+On SPARC/SPARC64, EPOLLRDHUP (0x2000) and POLLRDHUP (0x0800) are
+different bits, breaking the assumption elsewhere in this file that
+epoll and poll flags are interchangeable.
+
+Introduce a combined RDHUP value for this architecture and translate
+it before epoll_ctl() and after epoll_wait(), since revents_ is later
+tested against POLLRDHUP in Channel::handleEvent() — otherwise
+half-close detection would silently break at runtime.
+
+This patch is inspired by the equivalent fix in lighttpd:
+https://redmine.lighttpd.net/issues/3251
+
+Signed-off-by: Dario Binacchi <[email protected]>
+Upstream: https://github.com/an-tao/trantor/pull/407
+---
+ trantor/trantor/net/inner/poller/EpollPoller.cc | 25 ++++++++++++++++++++++++-
+ 1 file changed, 24 insertions(+), 1 deletion(-)
+
+diff --git a/trantor/trantor/net/inner/poller/EpollPoller.cc b/trantor/trantor/net/inner/poller/EpollPoller.cc
+index c9c4f7d481b4..812b48c30d79 100644
+--- a/trantor/trantor/net/inner/poller/EpollPoller.cc
++++ b/trantor/trantor/net/inner/poller/EpollPoller.cc
+@@ -22,6 +22,9 @@
+ #include <assert.h>
+ #include <strings.h>
+ #include <iostream>
++#if (defined(__sparc__) || defined(__sparc))
++#define TRANTOR_RDHUP 0x2800 /* EPOLLRDHUP | POLLRDHUP */
++#endif
+ #elif defined _WIN32
+ #include "Wepoll.h"
+ #include <assert.h>
+@@ -38,7 +41,12 @@ namespace trantor
+ static_assert(EPOLLIN == POLLIN, "EPOLLIN != POLLIN");
+ static_assert(EPOLLPRI == POLLPRI, "EPOLLPRI != POLLPRI");
+ static_assert(EPOLLOUT == POLLOUT, "EPOLLOUT != POLLOUT");
++#if (defined(__sparc__) || defined(__sparc))
++static_assert(EPOLLRDHUP & TRANTOR_RDHUP,
++              "EPOLLRDHUP not included in TRANTOR_RDHUP");
++#else
+ static_assert(EPOLLRDHUP == POLLRDHUP, "EPOLLRDHUP != POLLRDHUP");
++#endif
+ static_assert(EPOLLERR == POLLERR, "EPOLLERR != POLLERR");
+ static_assert(EPOLLHUP == POLLHUP, "EPOLLHUP != POLLHUP");
+ #endif
+@@ -127,7 +135,15 @@ void EpollPoller::fillActiveChannels(int numEvents,
+         assert(it != channels_.end());
+         assert(it->second == channel);
+ #endif
+-        channel->setRevents(events_[i].events);
++        int revents = events_[i].events;
++#if defined(__linux__) && (defined(__sparc__) || defined(__sparc))
++        if (revents & EPOLLRDHUP)
++        {
++            revents &= ~EPOLLRDHUP;
++            revents |= POLLRDHUP;
++        }
++#endif
++        channel->setRevents(revents);
+         activeChannels->push_back(channel);
+     }
+     // LOG_TRACE<<"active Channels num:"<<activeChannels->size();
+@@ -205,6 +221,13 @@ void EpollPoller::update(int operation, Channel *channel)
+     struct epoll_event event;
+     memset(&event, 0, sizeof(event));
+     event.events = channel->events();
++#if defined(__linux__) && (defined(__sparc__) || defined(__sparc))
++    if (event.events & TRANTOR_RDHUP)
++    {
++        event.events &= ~TRANTOR_RDHUP;
++        event.events |= EPOLLRDHUP;
++    }
++#endif
+     event.data.ptr = channel;
+     int fd = channel->fd();
+     if (::epoll_ctl(epollfd_, operation, fd, &event) < 0)
+-- 
+2.43.0
+
diff --git a/package/drogon/Config.in b/package/drogon/Config.in
new file mode 100644
index 000000000000..cbb44197e418
--- /dev/null
+++ b/package/drogon/Config.in
@@ -0,0 +1,52 @@
+config BR2_PACKAGE_DROGON
+	bool "drogon"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_11 # C++17/20
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU # util-linux (libuuid)
+	select BR2_PACKAGE_JSONCPP
+	select BR2_PACKAGE_UTIL_LINUX
+	select BR2_PACKAGE_UTIL_LINUX_LIBUUID
+	select BR2_PACKAGE_ZLIB
+	help
+	  Drogon is a C++17/20 based HTTP application framework.
+	  Drogon can be used to easily build various types of web
+	  application server programs using C++.
+
+	  https://github.com/drogonframework/drogon
+
+if BR2_PACKAGE_DROGON
+
+config BR2_PACKAGE_DROGON_BROTLI
+	bool "build Brotli"
+	select BR2_PACKAGE_BROTLI
+	help
+	  Add support for brotli compression.
+
+config BR2_PACKAGE_DROGON_CTL
+	bool "build drogon_ctl"
+	help
+	  drogon_ctl is a command-line tool used to generate
+	  project skeletons and source code.
+
+config BR2_PACKAGE_DROGON_EXAMPLES
+	bool "build examples"
+
+config BR2_PACKAGE_DROGON_ORM
+	bool "build orm"
+	help
+	  Enable the ORM module for typed database access.
+
+config BR2_PACKAGE_DROGON_YAML_CONFIG
+	bool "build yaml config"
+	select BR2_PACKAGE_YAML_CPP
+	help
+	  Add support for YAML configuration via yaml-cpp.
+
+endif
+
+comment "drogon needs a toolchain w/ C++, threads, gcc >= 11"
+	depends on BR2_USE_MMU
+	depends on !BR2_INSTALL_LIBSTDCPP || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_11 || \
+		!BR2_TOOLCHAIN_HAS_THREADS
diff --git a/package/drogon/drogon.hash b/package/drogon/drogon.hash
new file mode 100644
index 000000000000..997fd519e1d6
--- /dev/null
+++ b/package/drogon/drogon.hash
@@ -0,0 +1,3 @@
+# Locally calculated
+sha256  1d7dc4591b61c34903362209e58a3f92903c76ce6514ffba5ccfaa86a2e3227c  drogon-v1.9.13-git4.tar.gz
+sha256  7e1ed2ca339c384279f1e195e99916eb0145a0d87659969c7e22f8fdd53e11fd  LICENSE
diff --git a/package/drogon/drogon.mk b/package/drogon/drogon.mk
new file mode 100644
index 000000000000..89b1b2720c7d
--- /dev/null
+++ b/package/drogon/drogon.mk
@@ -0,0 +1,63 @@
+################################################################################
+#
+# drogon
+#
+################################################################################
+
+DROGON_VERSION = v1.9.13
+DROGON_SITE = https://github.com/drogonframework/drogon
+DROGON_SITE_METHOD = git
+DROGON_GIT_SUBMODULES = YES
+DROGON_LICENSE = MIT
+DROGON_LICENSE_FILES = LICENSE
+DROGON_INSTALL_STAGING = YES
+
+DROGON_DEPENDENCIES = jsoncpp util-linux zlib
+HOST_DROGON_DEPENDENCIES = host-jsoncpp host-util-linux host-zlib
+
+DROGON_CONF_OPTS = \
+	-DBUILD_TESTS=OFF
+
+HOST_DROGON_CONF_OPTS = \
+	-DBUILD_CTL=ON \
+	-DBUILD_EXAMPLES=OFF \
+	-DBUILD_TESTS=OFF
+
+ifeq ($(BR2_PACKAGE_DROGON_BROTLI),y)
+DROGON_DEPENDENCIES += brotli
+DROGON_CONF_OPTS += -DBUILD_BROTLI=ON
+else
+DROGON_CONF_OPTS += -DBUILD_BROTLI=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_DROGON_CTL),y)
+# When we have drogon_ctl for the target, we need to build the
+# _drogon_ctl tool with host-drogon support so that it can be
+# run during the building process
+DROGON_DEPENDENCIES += host-drogon
+DROGON_CONF_OPTS += -DBUILD_CTL=ON
+else
+DROGON_CONF_OPTS += -DBUILD_CTL=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_DROGON_EXAMPLES),y)
+DROGON_CONF_OPTS += -DBUILD_EXAMPLES=ON
+else
+DROGON_CONF_OPTS += -DBUILD_EXAMPLES=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_DROGON_ORM),y)
+DROGON_CONF_OPTS += -DBUILD_ORM=ON
+else
+DROGON_CONF_OPTS += -DBUILD_ORM=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_DROGON_YAML_CONFIG),y)
+DROGON_DEPENDENCIES += yaml-cpp
+DROGON_CONF_OPTS += -DBUILD_YAML_CONFIG=ON
+else
+DROGON_CONF_OPTS += -DBUILD_YAML_CONFIG=OFF
+endif
+
+$(eval $(cmake-package))
+$(eval $(host-cmake-package))
-- 
2.43.0

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