[llvm-bugs] [Bug 34352] New: [cmake][modules] 'ninja clean' does not remove modules.cache directory

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34352

            Bug ID: 34352
           Summary: [cmake][modules] 'ninja clean' does not remove
                    modules.cache directory
           Product: Build scripts
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: rtrieu at google.com
                CC: llvm-bugs at lists.llvm.org

My system had an update to a library file, so it failed a modules build.  I
tried to clean out the files and build again, but that didn't work.  It
required a manual delete of the modules directory in order to get a rebuild of
Clang.

$ ninja
...
fatal error: file '/usr/include/linux/errno.h' has been modified since the
module file '<<build
directory>>/module.cache/VFOLNPBRXSUY/LLVM_IRReader-37GEUGWS2AK5A.pcm' was
built
note: please rebuild precompiled header '<<build
directory>>/module.cache/VFOLNPBRXSUY/LLVM_IRReader-37GEUGWS2AK5A.pcm'
1 error generated.

$ ninja clean

[1/1] Cleaning all built files...
Cleaning... 3806 files.

$ ninja
...
fatal error: file '/usr/include/linux/errno.h' has been modified since the
module file '<<build
directory>>/module.cache/VFOLNPBRXSUY/LLVM_IRReader-37GEUGWS2AK5A.pcm' was
built
note: please rebuild precompiled header '<<build
directory>>/module.cache/VFOLNPBRXSUY/LLVM_IRReader-37GEUGWS2AK5A.pcm'
1 error generated.

$ rm module.cache -r

$ ninja
<<build successful>>

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