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For Linux/gnu compatibility, preinclude <stdc-predef.h> if the file is available

Description

For Linux/gnu compatibility, preinclude <stdc-predef.h> if the file is available

As reported in llvm bugzilla 32377.
Here’s a patch to add preinclude of stdc-predef.h.

The gcc documentation says “On GNU/Linux, <stdc-predef.h> is pre-included.”
See https://gcc.gnu.org/gcc-4.8/porting_to.html;

The preinclude is inhibited with –ffreestanding.

Basically I fixed the failing test cases by adding –ffreestanding which inhibits
this behavior.

I fixed all the failing tests, including some in extra/test, there's a separate
patch for that which is linked here

Patch By: mibintc

Differential Revision: https://reviews.llvm.org/D34158

Details

Event Timeline

This patch did cause a buildbot failure which i could reproduce on my local system.

The corresponding error message is:

-- Testing: 34968 tests, 4 threads --
Testing: 0 .. 10.. 20.. 30.. 
FAIL: Clang-Unit :: libclang/./libclangTests/LibclangParseTest.AllSkippedRanges (14620 of 34968)
******************** TEST 'Clang-Unit :: libclang/./libclangTests/LibclangParseTest.AllSkippedRanges' FAILED ********************
Note: Google Test filter = LibclangParseTest.AllSkippedRanges
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from LibclangParseTest
[ RUN      ] LibclangParseTest.AllSkippedRanges
/home/buildslave/buildslave/clang-cmake-thumbv7-a15/llvm/tools/clang/unittests/libclang/LibclangTest.cpp:442: Failure
      Expected: 2U
      Which is: 2
To be equal to: Ranges->count
      Which is: 4
/home/buildslave/buildslave/clang-cmake-thumbv7-a15/llvm/tools/clang/unittests/libclang/LibclangTest.cpp:448: Failure
      Expected: 1U
      Which is: 1
To be equal to: line
      Which is: 36
/home/buildslave/buildslave/clang-cmake-thumbv7-a15/llvm/tools/clang/unittests/libclang/LibclangTest.cpp:451: Failure
      Expected: 3U
      Which is: 3
To be equal to: line
      Which is: 40
/home/buildslave/buildslave/clang-cmake-thumbv7-a15/llvm/tools/clang/unittests/libclang/LibclangTest.cpp:455: Failure
      Expected: 2U
      Which is: 2
To be equal to: line
      Which is: 44
/home/buildslave/buildslave/clang-cmake-thumbv7-a15/llvm/tools/clang/unittests/libclang/LibclangTest.cpp:458: Failure
      Expected: 4U
      Which is: 4
To be equal to: line
      Which is: 48
[  FAILED  ] LibclangParseTest.AllSkippedRanges (18 ms)
[----------] 1 test from LibclangParseTest (18 ms total)

The error messages seem to be representative on all failing builders (it where quite a few, but not all).

After looking at the codechanges and the failing tests (i have no clue about libclang stuff and the internals):

  • the test checks how many ranges were skipped (probably by preprocessor #ifdef ).
  • because the patch introduces preprocessor conditionals (cfe/trunk/lib/Frontend/InitPreprocessor.cpp 73-81) the values in the testcase get wrong.

speculative patch that will just change the test values. i did not check if the result that changed actually makes sense.

D40265 could be applied to silence the warnings. Do on your own will, i dont seem to be able to commit the patch in clang.