CPack/RPM test for Suggests tag

Suggests tag was not present in older versions
of rpmbuild so we test that the rpm package is
always generated either with Suggests tag present
or skipped if not supported.

Tests/RunCMake/CPack/RPM/RPM_SUGGESTS-ExpectedFiles.cmake

@@ -0,0 +1,5 @@
+set(whitespaces_ "[\t\n\r ]*")
+
+set(EXPECTED_FILES_COUNT "1")
+set(EXPECTED_FILE_1 "rpm_suggests*.rpm")
+set(EXPECTED_FILE_CONTENT_1 "^/usr/foo${whitespaces_}/usr/foo/CMakeLists.txt$")

Tests/RunCMake/CPack/RPM/RPM_SUGGESTS-VerifyResult.cmake

@@ -0,0 +1,31 @@
+execute_process(COMMAND ${RPMBUILD_EXECUTABLE} --querytags
+                OUTPUT_VARIABLE RPMBUILD_CAPS
+                RESULT_VARIABLE RPMBUILD_CAPS_RESULT)
+
+if(NOT RPMBUILD_CAPS_RESULT)
+  string(REPLACE "\n" ";" RPMBUILD_CAPS "${RPMBUILD_CAPS}")
+  cmake_policy(PUSH)
+    cmake_policy(SET CMP0057 NEW)
+    if(SUGGESTS IN_LIST RPMBUILD_CAPS)
+      set(should_contain_suggests_tag_ true)
+    endif()
+  cmake_policy(POP)
+endif()
+
+# Only verify that suggests tag is present only if that tag is supported.
+# If it is not supported the rpm package was corretly generated by ignoring
+# that tag and that was already checked by expected files test.
+if(should_contain_suggests_tag_)
+  execute_process(COMMAND ${RPM_EXECUTABLE} -q --suggests -p "${FOUND_FILE_1}"
+                  WORKING_DIRECTORY "${CPACK_TEMPORARY_DIRECTORY}"
+                  RESULT_VARIABLE rpm_result_
+                  OUTPUT_VARIABLE rpm_output_
+                  ERROR_VARIABLE error_variable_
+                  OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+  if(rpm_result_ OR NOT rpm_output_ STREQUAL "libsuggested")
+    message(FATAL_ERROR "RPM_SUGGESTED package error: no suggested packages"
+        " (result: '${rpm_result_}'; output: '${rpm_output_}';"
+        " error: '${error_variable_}')")
+  endif()
+endif()

Tests/RunCMake/CPack/RPM_SUGGESTS.cmake

@@ -0,0 +1,4 @@
+install(FILES CMakeLists.txt DESTINATION foo)
+
+set(CPACK_RPM_PACKAGE_SUGGESTS "libsuggested")
+set(CPACK_PACKAGE_NAME "rpm_suggests")

Tests/RunCMake/CPack/RunCMakeTest.cmake

@@ -15,6 +15,7 @@ run_cpack_test(CUSTOM_NAMES "RPM;DEB" true)
 run_cpack_test_subtests(MAIN_COMPONENT "invalid;found" "RPM" false)
 run_cpack_test(PER_COMPONENT_FIELDS "RPM;DEB" false)
 run_cpack_test(RPM_DIST "RPM" false)
+run_cpack_test(RPM_SUGGESTS "RPM" false)
 run_cpack_test(INSTALL_SCRIPTS "RPM" false)
 run_cpack_test(DEB_GENERATE_SHLIBS "DEB" true)
 run_cpack_test(DEB_GENERATE_SHLIBS_LDCONFIG "DEB" true)