Revert "Disable erroring TravisCI build" (#1960)

* Revert "Disable erroring TravisCI build"

This reverts commit b59d78c.

Signed-off-by: Basil Hess <bhe@zurich.ibm.com>

* disable cross on s390x

Signed-off-by: Basil Hess <bhe@zurich.ibm.com>

* remove status badge

Signed-off-by: Basil Hess <bhe@zurich.ibm.com>

---------

Signed-off-by: Basil Hess <bhe@zurich.ibm.com>

.travis.yml

@@ -0,0 +1,21 @@
+language: c
+before_script:
+  - sudo apt update && sudo apt -y install astyle cmake gcc ninja-build libssl-dev python3-pytest python3-pytest-xdist unzip xsltproc doxygen graphviz valgrind
+jobs:
+  include:
+    - arch: ppc64le         # The IBM Power LXD container based build for OSS only
+      os: linux             # required for arch different than amd64
+      dist: focal           # or bionic | xenial with xenial as default
+      compiler: gcc
+      if: NOT branch =~ /^ghactionsonly-/
+      script:
+        - mkdir build && cd build && cmake -GNinja -DOQS_ENABLE_SIG_STFL_LMS=ON -DOQS_ENABLE_SIG_STFL_XMSS=ON -DOQS_HAZARDOUS_EXPERIMENTAL_ENABLE_STFL_SIG_KEY_SIG_GEN=ON .. && cmake -LA -N .. && ninja
+        - cd build & ninja run_tests
+    - arch: s390x
+      os: linux
+      dist: focal
+      compiler: gcc
+      if: NOT branch =~ /^ghactionsonly-/
+      script:
+        - mkdir build && cd build && cmake -GNinja -DOQS_ENABLE_SIG_STFL_LMS=ON -DOQS_ENABLE_SIG_STFL_XMSS=ON -DOQS_HAZARDOUS_EXPERIMENTAL_ENABLE_STFL_SIG_KEY_SIG_GEN=ON .. && cmake -LA -N .. && ninja
+        - cd build & ninja run_tests

CMakeLists.txt

@@ -118,6 +118,8 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(ppc|powerpc)")
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "s390x")
     set(ARCH "s390x")
     set(ARCH_S390X ON)
+    # CROSS not supported on big-endian (https://github.com/open-quantum-safe/liboqs/issues/1961)
+    set(OQS_ENABLE_SIG_CROSS OFF)
     if(${OQS_DIST_BUILD})
         set(OQS_DIST_S390X_BUILD ON)
     endif()