[llvm-bugs] [Bug 45449] New: -C requires -E

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45449

            Bug ID: 45449
           Summary: -C requires -E
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: enh at google.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk,
                    sguelton at redhat.com, srhines at google.com,
                    tstellar at redhat.com

Upgrading Android's checkout of GNU Make to version 3.4
(https://android-review.googlesource.com/c/toolchain/make/+/1278571) exposed a
build failure due to the error: invalid argument '-C' only allowed with '-E'.

Documented here:
https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#Preprocessor-Options

I suspect it's just a slight papercut, and that we should just have `-C` imply
`-E` which I think would match GCC's behavior.  Otherwise we should submit a
patch to GNU Make to use `-C -E` together for portability to Clang.

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