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I tried to install mysql with mariadb-clients as provider for mysql-clients:

:: There are 2 providers available for mysql-clients:
:: Repositoryextra
    1) mariadb-clients :: Repositorycommunity
    2) percona-server-clients 

Enter a number (default=1):

Which leads to:

error: failed to commit transaction (conflicting files)
mysql: /usr/bin/mysql_upgrade exists in filesystem (owned by mariadb-clients)
mysql: /usr/bin/mysqlbinlog exists in filesystem (owned by mariadb-clients)
mysql: /usr/bin/mysqltest exists in filesystem (owned by mariadb-clients)
mysql: /usr/share/man/man1/mysql_upgrade.1.gz exists in filesystem (owned by mariadb-clients)
mysql: /usr/share/man/man1/mysqlbinlog.1.gz exists in filesystem (owned by mariadb-clients)
Errors occurred, no packages were upgraded.

I'm confused

Edit: I just removed the existing mariadb libs (without dependency check):

yay -ddR mariadb-libs

and installed the mysql-clients with libmysqlclient. After that it was possible to install mysql..

Is there a better approach?

postfix needs mariadb-libs

I think there are some incompatibilities between the last Manjaro update and this MySQL package. Do you know when it can be fixed?

Incorporated FrederickZh's fixes, Thank you

I'm also facing the error "TRUE was not declared in this scope" while compiling.

I added: export CXXFLAGS="${CXXFLAGS} -DU_DEFINE_FALSE_AND_TRUE=1"

before the:

cmake "../${pkgbase}-${pkgver}"

and now the compilation finishes

Please add FrederickZh's patch.

And for some reason I now need to patch mysqld.cc otherwise it won't compile (TRUE was not declared in this scope):

diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 51992613..0dc0c7c4 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -925,8 +925,9 @@ using std::min;
 using std::vector;

 #define mysqld_charset &my_charset_latin1
 #define mysqld_default_locale_name "en_US"
+#define TRUE (1)

 #ifdef HAVE_FPU_CONTROL_H
 #include <fpu_control.h>  // IWYU pragma: keep
 #elif defined(__i386__)

This happens under my two Arch systems as well as a clean chroot.

I don't use MySQL Router, but an error during post-upgrade caught my eye:

(2/5) Creating temporary files...
/usr/lib/tmpfiles.d/mysqlrouter.conf:23: Path 'run' not absolute.
error: command failed to execute correctly

And after digging deeper, I noticed that the default directories used by MySQL Router are obviously off as well:

$ mysqlrouter --help
MySQL Router  Ver 8.0.22 for Linux on x86_64 (Source distribution)
Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Configuration read from the following files in the given order (enclosed
in parentheses means not available for reading):
  (/usr/bin/.././mysqlrouter.conf)
  (/usr/bin/.././mysqlrouter.ini)
  (/home/frederick/.mysqlrouter.conf)
  (/home/frederick/.mysqlrouter.ini)
Plugins Path:
  /usr/lib/mysqlrouter

Default Log Directory:
  /usr

Default Persistent Data Directory:
  /usr/bin/../var/lib/mysqlrouter

Default Runtime State Directory:
  /usr/bin/../run

Here's a patch I've come up with (without .SRCINFO):

diff --git a/PKGBUILD b/PKGBUILD
index 4d305fe..9d11faa 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -25,9 +25,9 @@ sha256sums=('ba765f74367c638d7cd1c546c05c14382fd997669bcd9680278e907f8d7eb484'
             '6bc24ae510f6b6bbad6b3edda2d0028b29292937b482274a4c2fae335f4de328'
             'e1c23fa0971a13d998f2790379b68c475438d05b6d6f2691b99051dbf497567f'
             '203dcd22fea668477ac7123dbd9909fae72d3d07f8855417a669a9c94db072ae'
             '8fbedfc2c5fe271ed13217feeceeac00202d2cb135e4283eeee2f9a13d6251af'
-            '7dfc863de8ba62b31e412bdb82a2617c90b9e588db34028ab694813547dab167')
+            '0c047b18b9d40cae66be6d234d655347ee84d36420c8d70dc07334b6c960d9c7')

 build() {
   rm -rf build
   mkdir build
@@ -52,8 +52,12 @@ build() {
     -DINSTALL_SUPPORTFILESDIR=share/mysql \
     -DINSTALL_MYSQLSHAREDIR=share/mysql \
     -DINSTALL_DOCDIR=share/mysql/docs \
     -DINSTALL_SHAREDIR=share/mysql \
+    -DROUTER_INSTALL_CONFIGDIR=../etc/mysqlrouter \
+    -DROUTER_INSTALL_DATADIR=../var/lib/mysqlrouter \
+    -DROUTER_INSTALL_RUNTIMEDIR=../run \
+    -DROUTER_INSTALL_LOGDIR=../var/log/mysqlrouter \
     -DWITH_SYSTEM_LIBS=ON \
     -DWITH_SSL=system \
     -DWITH_LIBWRAP=OFF \
     -DWITH_LTO=ON \
@@ -135,8 +139,9 @@ package_mysql-clients(){

 package_mysql(){
   pkgdesc="Fast SQL database server, community edition"
   backup=("etc/mysql/my.cnf"
+          "etc/mysqlrouter/mysqlrouter.conf"
           "etc/conf.d/${pkgname}.conf")
   install="${pkgbase}.install"
   depends=('mysql-clients' 'libsasl' 'zlib' 'jemalloc' 'libaio' 'libtirpc' 'icu'
            'lz4' 'libevent' 'systemd-libs')
@@ -150,8 +155,9 @@ package_mysql(){

   install -m 644 -D "${srcdir}/my-default.cnf" "${pkgdir}/etc/mysql/my.cnf"
   install -m 755 -d "${pkgdir}/etc/ld.so.conf.d"
   install -m 644 -D "${srcdir}/mysql-ld.so.conf" "${pkgdir}/etc/ld.so.conf.d/${pkgname}.conf"
+  install -m 644 -D "${srcdir}/build/packaging/rpm-common/mysqlrouter.conf" "${pkgdir}/etc/mysqlrouter/mysqlrouter.conf"

   # provided by libmysqlclient
   rm "${pkgdir}/usr/bin/mysql_config"
   rm "${pkgdir}/usr/lib/libmysqlclient.a"
@@ -187,9 +193,9 @@ package_mysql(){
   rm "${pkgdir}/usr/share/man/man1/mysqlslap.1"

   # not needed
   rm -r "${pkgdir}/usr/mysql-test"
-  rmdir "${pkgdir}/usr/run"
+  rmdir "${pkgdir}/run"

   # Move somewhere else
   mv "${pkgdir}/usr/LICENSE.router" "${pkgdir}/usr/share/mysql/docs"
   mv "${pkgdir}/usr/README.router" "${pkgdir}/usr/share/mysql/docs"
@@ -206,11 +212,13 @@ package_mysql(){

   # Cleanup
   rmdir "${pkgdir}/usr/usr/lib"
   rmdir "${pkgdir}/usr/usr"
-  rmdir "${pkgdir}/usr/var/lib/mysqlrouter"
-  rmdir "${pkgdir}/usr/var/lib"
-  rmdir "${pkgdir}/usr/var"
+  rmdir "${pkgdir}/var/lib/mysqlrouter"
+  rmdir "${pkgdir}/var/lib"
+  rmdir "${pkgdir}/var/log/mysqlrouter"
+  rmdir "${pkgdir}/var/log"
+  rmdir "${pkgdir}/var"

   # Arch Linux specific patches:
   #  * enable PrivateTmp for a little bit more security
   #  * force preloading jemalloc for memory management
diff --git a/mysql.install b/mysql.install
index 90583a1..384c764 100644
--- a/mysql.install
+++ b/mysql.install
@@ -6,8 +6,16 @@ post_install(){
     install -dm700 "/var/lib/mysql"
     chown -R mysql:mysql "/var/lib/mysql" &>/dev/null
   fi

+  groupadd -g 88 mysqlrouter &>/dev/null
+  useradd -u 88 -g mysqlrouter -d "/var/lib/mysqlrouter" -s /bin/false mysqlrouter &>/dev/null
+
+  if [[ ! -e "/var/lib/mysqlrouter" ]]; then
+    install -dm700 "/var/lib/mysqlrouter"
+    chown -R mysqlrouter:mysqlrouter "/var/lib/mysqlrouter" &>/dev/null
+  fi
+
   echo ":: You need to initialize the MySQL data directory prior to starting"
   echo "   the service. This can be done with mysqld --initialize command, e.g.:"
   echo "   mysqld --initialize --user=mysql --basedir=/usr --datadir=/var/lib/mysql"
   echo ":: Additionally you should secure your MySQL installation using"
@@ -20,5 +28,11 @@ post_remove(){
   fi
   if getent group mysql >/dev/null 2>&1; then
     groupdel mysql
   fi
+  if getent passwd mysqlrouter >/dev/null 2>&1; then
+    userdel mysqlrouter
+  fi
+  if getent group mysqlrouter >/dev/null 2>&1; then
+    groupdel mysqlrouter
+  fi
 }
diff --git a/systemd-sysusers-tmpfiles.patch b/systemd-sysusers-tmpfiles.patch
index 6eccab1..ea21328 100644
--- a/systemd-sysusers-tmpfiles.patch
+++ b/systemd-sysusers-tmpfiles.patch
@@ -7,4 +7,14 @@
 -d /var/run/mysqld 0755 mysql mysql  -
 +d /run/mysqld 0755 mysql mysql  -
 +d /var/lib/mysql 0700 mysql mysql  -

+--- a/usr/lib/tmpfiles.d/mysqlrouter.conf  2020-12-25 21:41:47.218202248 +1100
++++ b/usr/lib/tmpfiles.d/mysqlrouter.conf  2020-12-25 21:42:07.126124043 +1100
+@@ -20,4 +20,6 @@
+ # along with this program; if not, write to the Free Software
+ # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
+ 
+-d ../run 0755 mysqlrouter mysqlrouter  -
++d /run/mysqlrouter 0755 mysqlrouter mysqlrouter  -
++d /var/lib/mysqlrouter 0700 mysqlrouter mysqlrouter  -
++d /var/log/mysqlrouter 0750 mysqlrouter mysqlrouter  -

tl;dr this patch:

1. creates mysqlrouter user & group during post-install
2. fixes the post-upgrade problem above
3. creates /var/lib/mysqlrouter & /var/log/mysqlrouter via systemd-tmpfiles
4. copies the default Router configuration to /etc/mysqlrouter/mysqlrouter.conf

Btw now mysqlrouter --help output becomes:

Configuration read from the following files in the given order (enclosed
in parentheses means not available for reading):
  /etc/mysqlrouter/mysqlrouter.conf
  (/etc/mysqlrouter/mysqlrouter.ini)
  (/home/frederick/.mysqlrouter.conf)
  (/home/frederick/.mysqlrouter.ini)
Plugins Path:
  /usr/lib/mysqlrouter

Default Log Directory:
  /var/log/mysqlrouter

Default Persistent Data Directory:
  /var/lib/mysqlrouter

Default Runtime State Directory:
  /run

PS: this might be useful https://koji.mbox.centos.org/pkgs/packages/mysql/8.0.21/1.module_el8.2.0+493+63b41e36/data/logs/x86_64/build.log

@ruidc mysqlbinlog is included in the mysql package

I'm getting shared libraries errors with latest icu package.

mysqld: error while loading shared libraries: libicuuc.so.67: cannot open shared object file: No such file or directory

can mysqlbinlog be added? the diff provided by FrederickZh over a year ago won't work on recent versions