Experimental support for CentOS 7

Author: stevapple

.github/workflows/CI.yaml

@@ -511,7 +511,7 @@ jobs:
         swift test.swift
         swiftc test.swift -o test && ./test
 
-  test-centos-nightly:
+  test-centos8-nightly:
     container:
       image: centos:8
     runs-on: ubuntu-latest
@@ -548,6 +548,43 @@ jobs:
         swift test.swift
         swiftc test.swift -o test && ./test
 
+  test-centos7-nightly:
+    container:
+      image: centos:7
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash --login -eo pipefail {0}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Test swiftbox version
+      run: |
+        chmod +x swiftbox.sh
+        ./swiftbox.sh -v
+
+    - name: Test swiftbox check nightly
+      run: ./swiftbox.sh check nightly
+
+    - name: Test swiftbox get nightly
+      run: ./swiftbox.sh get nightly
+
+    - name: Install which
+      run: yum install which -y
+
+    - name: Test Swift status
+      run: |
+        echo "\$PATH=$PATH"
+        ./swiftbox.sh list
+        which swift
+        swiftc -v
+
+    - name: Test Swift compiler
+      run: |
+        swift test.swift
+        swiftc test.swift -o test && ./test
+
   test-amzn-nightly:
     container:
       image: amazonlinux:2

swiftbox.sh

@@ -116,8 +116,17 @@ init-env() {
         esac
     ;;
     centos)
-        $SUDO_FLAG yum install epel-release -y
-        $SUDO_FLAG yum install --enablerepo=PowerTools binutils gcc git glibc-static libbsd-devel libedit libedit-devel libicu-devel libstdc++-static pkg-config python2 sqlite -y
+        $SUDO_FLAG yum install binutils gcc git libedit libicu-devel pkg-config python2 sqlite zlib-devel -y
+        case $SYSTEM_VERSION in
+        7)
+            $SUDO_FLAG yum install shadow-utils libbsd-devel glibc-static libstdc++-static libedit-devel -y
+            sed -i -e 's/\*__block/\*__libc_block/g' /usr/include/unistd.h
+        ;;
+        8)
+            $SUDO_FLAG yum install epel-release -y
+            $SUDO_FLAG yum install --enablerepo=PowerTools libbsd-devel glibc-static libstdc++-static libedit-devel -y
+        ;;
+        esac
     ;;
     amazonlinux)
         $SUDO_FLAG yum install binutils gcc git glibc-static gzip libbsd libcurl libedit libicu sqlite libstdc++-static libuuid libxml2 tar -y