travis: add an extra dmake job which will not fail the entire build if the makefile needs to be regenerated

.travis.yml

@@ -18,6 +18,7 @@ env:
     - CXXFLAGS="${CXXFLAGS} -DCHECK_INTERNAL" MAKEFLAGS="HAVE_RULES=yes" SRCDIR=build VERIFY=1
     - SRCDIR=build CHECK_CLANG=yes VERIFY=1
     - SRCDIR=build CHECK_LLVM=yes VERIFY=1
+    - CHECK_MAKEFILE_REGEN=true
 
 matrix:
 # do notify immediately about it when a job of a build fails.
@@ -28,6 +29,11 @@ matrix:
       env: SRCDIR=build CHECK_CLANG=yes VERIFY=1
     - compiler: gcc
       env: SRCDIR=build CHECK_LLVM=yes VERIFY=1
+    - compiler: gcc
+      env: CHECK_MAKEFILE_REGEN=true
+  allow_failures:
+    - compiler: clang
+      env: CHECK_MAKEFILE_REGEN=true
 
 before_install:
 # install needed deps
@@ -41,6 +47,10 @@ script:
   - if [[ "$CHECK_CLANG" == "yes" ]] && [[ "$CC" == "clang" ]]; then wget "https://github.com/llvm-mirror/clang/archive/bcaf7f2abe47b0dab055f1a0ec011ed9c2a3d3ea.zip" & make -j 4 & wait; unzip bcaf7f2abe47b0dab055f1a0ec011ed9c2a3d3ea.zip > /dev/null; touch /tmp/clang.cppcheck; cd ./clang-bcaf7f2abe47b0dab055f1a0ec011ed9c2a3d3ea ; ../cppcheck . --max-configs=1 --enable=all --inconclusive --exception-handling --template="{callstack} ({severity}) {message} [{id}]" -iINPUTS -itest/Driver/Inputs/gen-response.c -itest/Index/index-many-logical-ops.c -itest/Sema/many-logical-ops.c -j 2 |& tee /tmp/clang.cppcheck; cd ../ ; echo "CLANG" ; ! grep "process crashed with signal\|Internal error\. compiled" /tmp/clang.cppcheck; exit; fi
 # check llvm as well
   - if [[  "$CHECK_LLVM" == "yes" ]] && [[ "$CC" == "clang" ]]; then wget "https://github.com/llvm-mirror/llvm/archive/7733e74e5454d6f18da28c06be917c1e73d12d01.zip"  & make -j 4 & wait; unzip 7733e74e5454d6f18da28c06be917c1e73d12d01.zip > /dev/null;  touch /tmp/llvm.cppcheck;  cd ./llvm-7733e74e5454d6f18da28c06be917c1e73d12d01 ; ../cppcheck . --max-configs=1 --enable=all --inconclusive --exception-handling --template="{callstack} ({severity}) {message} [{id}]" -j 2 |& tee /tmp/llvm.cppcheck; cd ../ ; echo "LLVM"  ; ! grep "process crashed with signal\|Internal error\. compiled" /tmp/llvm.cppcheck; exit; fi
+# check if dmake needs to be rerun but if yes, don't fail the build but notify us.
+# to update dmake: "make dmake; ./dmake; and commit
+  - echo "If the following commmand fails, run 'make dmake; make run-dmake' and commit the resulting change."
+  - if [[ "$CHECK_MAKEFILE_REGEN" == "true" ]]; then make -s dmake; make -s run-dmake ; git diff --exit-code; exit; fi
 # check with TEST_MATHLIB_VALUE enabled
   - touch lib/mathlib.cpp test/testmathlib.cpp
   - echo $CXXFLAGS
@@ -110,13 +120,6 @@ script:
 # check addons/misra.py
 #  - ./cppcheck --dump addons/misra-test.c
 #  - python addons/misra.py -verify addons/misra-test.c.dump
-# check if Makefile needs to be regenerated
-  - git clean -dfx
-  - echo $CXXFLAGS
-  - make -s dmake
-  - make -s run-dmake
-# now, if dmake modified the makefile, return false!
-  - git diff --exit-code
 
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