ci: Combine 32-bit build with CentOS 7 build

Author: theStack

.travis.yml

@@ -101,14 +101,9 @@ jobs:
         FILE_ENV="./ci/test/00_setup_env_win64.sh"
 
     - stage: test
-      name: '32-bit + dash  [GOAL: install]  [gui]'
+      name: '32-bit + dash  [GOAL: install]  [CentOS 7]  [gui]'
       env: >-
-        FILE_ENV="./ci/test/00_setup_env_i686.sh"
-
-    - stage: test
-      name: 'x86_64 Linux  [GOAL: install]  [CentOS 7]  [no depends, only system libs]'
-      env: >-
-        FILE_ENV="./ci/test/00_setup_env_native_centos.sh"
+        FILE_ENV="./ci/test/00_setup_env_i686_centos.sh"
 
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [bionic]  [uses qt5 dev package and some depends packages] [unsigned char]'

ci/test/00_setup_env_i686.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+export HOST=i686-pc-linux-gnu
+export DOCKER_NAME_TAG=centos:7
+export DOCKER_PACKAGES="gcc-c++ glibc-devel.x86_64 libstdc++-devel.x86_64 glibc-devel.i686 libstdc++-devel.i686 ccache libtool make git python3 python36-zmq which patch lbzip2 dash"
+export GOAL="install"
+export BITCOIN_CONFIG="--enable-zmq --with-gui=qt5 --enable-reduce-exports"
+export CONFIG_SHELL="/bin/dash"

ci/test/00_setup_env_i686_centos.sh

@@ -25,5 +25,13 @@ if [[ $HOST = *-mingw32 ]]; then
   DOCKER_EXEC update-alternatives --set $HOST-g++ \$\(which $HOST-g++-posix\)
 fi
 if [ -z "$NO_DEPENDS" ]; then
-  DOCKER_EXEC CONFIG_SHELL= make $MAKEJOBS -C depends HOST=$HOST $DEP_OPTS
+  if [[ $DOCKER_NAME_TAG == centos* ]]; then
+    # CentOS has problems building the depends if the config shell is not explicitely set
+    # (i.e. for libevent a Makefile with an empty SHELL variable is generated, leading to
+    #  an error as the first command is executed)
+    SHELL_OPTS="CONFIG_SHELL=/bin/bash"
+  else
+    SHELL_OPTS="CONFIG_SHELL="
+  fi
+  DOCKER_EXEC $SHELL_OPTS make $MAKEJOBS -C depends HOST=$HOST $DEP_OPTS
 fi