Merge pull request #12950 from bwbarrett/cleanup/jenkins-retire-old-stuff

ci: Remove Ubuntu 18.04 (and gcc 5 / 6)

Author: bwbarrett

.ci/community-jenkins/Jenkinsfile

@@ -53,8 +53,8 @@ println('Tests Completed')
 // build stage is a map of different configurations to test.
 def prepare_check_stages() {
     def configure_options = ["--disable-dlopen", "--disable-oshmem", "--enable-builtin-atomic", "--enable-ipv6"]
-    def compilers = ["clang10", "gcc5", "gcc6", "gcc7", "gcc8", "gcc9", "gcc10"]
-    def platforms = ["amazon_linux_2", "amazon_linux_2-arm64", "rhel8", "ubuntu_18.04"]
+    def compilers = ["clang10", "gcc7", "gcc8", "gcc9", "gcc10"]
+    def platforms = ["amazon_linux_2", "amazon_linux_2-arm64", "rhel8"]
     def check_stages_list = []
 
     // Build everything stage

docs/release-notes/platform.rst

@@ -27,11 +27,10 @@ that a release of Open MPI supports.
 * Systems that have been tested are:
 
   * Linux (various flavors/distros), 64 bit (x86, ppc, aarch64),
-    with gcc (>=4.8.x+), clang (>=3.6.0), Absoft (fortran), Intel,
+    with gcc/gfortran (>=7.x+), clang (>=10.x), Intel,
     and Portland (be sure to also see :ref:`the Compiler Notes
     section <compiler-notes-section-label>`)
-  * macOS (10.14-10.15, 11.x, 12.x), 64 bit (x86_64) with XCode
-    compilers
+  * macOS (14.x, 15.x), 64 bit (x86_64) with XCode compilers
 
 * Other systems have been lightly (but not fully) tested: