[LNT] Python 3 support: don't assume order of cmake args

Summary:
runtest/test_suite-cache.shtest test assumes the order of cmake
arguments but some of these are stored in the same dictionary which does
not guarantee any specific ordering. This causes the test to fail on
Python 3.

In particular, CMAKE_C_COMPILER and CMAKE_CXX_COMPILER must come first
but can be in any particular order between each other, then cmake cache
option is expected to come next followed by other option in any
particular order. Since there is no good reason to have arguments in a
given group of option sorted, this commit adapts the testcase to accept
any order by testing each group of argument in a separate FileCheck
invocation.

Reviewers: cmatthews, hubert.reinterpretcast, kristof.beyls, leandron, PrzemekWirkus, rogfer01

Reviewed By: rogfer01

Subscribers: rogfer01, llvm-commits

Differential Revision: https://reviews.llvm.org/D68863

Author: Thomas Preud'homme

tests/runtest/test_suite-cache.shtest

@@ -14,8 +14,23 @@
 # RUN:     --cmake-define FOO=BAR \
 # RUN:     -D BAR=BAZ \
 # RUN:     &> %t.cmake-cache.log
-# RUN: FileCheck  --check-prefix CHECK-CACHE < %t.cmake-cache.log %s
-# CHECK-CACHE: Execute: {{.*}}cmake -DCMAKE_CXX_COMPILER:FILEPATH={{.*}}/FakeCompilers/clang++-r154331 -DCMAKE_C_COMPILER:FILEPATH={{.*}}FakeCompilers/clang-r154331 -C {{.*}}/Release.cmake {{.*}}-DFOO=BAR{{.*}}-DBAR=BAZ
+
+# Check CMAKE_C_COMPILER and CMAKE_CXX_COMPILER comes first, followed by cmake
+# options. This is verified by checking that:
+# 1) there's 2 cmake compiler definition followed by the -C option
+# 2) each of the cmake compiler definition only accepts the other cmake
+#    compiler definition between cmake and itself
+# RUN: FileCheck  --check-prefix CHECK-CACHE1 < %t.cmake-cache.log %s
+# CHECK-CACHE1: Execute: {{.*}}cmake -DCMAKE_C{{(XX)?}}_COMPILER:FILEPATH={{.*}}/FakeCompilers/clang{{(\+\+)?}}-r154331 -DCMAKE_C{{(XX)?}}_COMPILER:FILEPATH={{.*}}/FakeCompilers/clang{{(\+\+)?}}-r154331 -C {{.*}}/Release.cmake
+# RUN: FileCheck  --check-prefix CHECK-CACHE2 < %t.cmake-cache.log %s
+# CHECK-CACHE2: Execute: {{.*}}cmake {{(-DCMAKE_CXX_COMPILER:FILEPATH=.*/FakeCompilers/clang\+\+-r154331 )?}}-DCMAKE_C_COMPILER:FILEPATH={{.*}}/FakeCompilers/clang-r154331
+# RUN: FileCheck  --check-prefix CHECK-CACHE3 < %t.cmake-cache.log %s
+# CHECK-CACHE3: Execute: {{.*}}cmake {{(-DCMAKE_C_COMPILER:FILEPATH=.*/FakeCompilers/clang-r154331 )?}}-DCMAKE_CXX_COMPILER:FILEPATH={{.*}}/FakeCompilers/clang++-r154331
+
+# RUN: FileCheck  --check-prefix CHECK-CACHE4 < %t.cmake-cache.log %s
+# CHECK-CACHE4: Execute: {{.*}}cmake {{(.+ )?}}-DFOO=BAR
+# RUN: FileCheck  --check-prefix CHECK-CACHE5 < %t.cmake-cache.log %s
+# CHECK-CACHE5: Execute: {{.*}}cmake {{(.+ )?}}-DBAR=BAZ
 
 # RUN: rm -rf %t.SANDBOX
 # Check a run of test-suite using a invalid cmake cache
@@ -29,5 +44,5 @@
 # RUN:     --use-lit %S/Inputs/test-suite-cmake/fake-lit \
 # RUN:     --cmake-cache Debug \
 # RUN:     &> %t.cmake-cache2.err || true
-# RUN: FileCheck  --check-prefix CHECK-CACHE2 < %t.cmake-cache2.err %s
-# CHECK-CACHE2: Could not find CMake cache file
+# RUN: FileCheck  --check-prefix CHECK-CACHE6 < %t.cmake-cache2.err %s
+# CHECK-CACHE6: Could not find CMake cache file