[llvm-bugs] [Bug 50330] New: -ansi is not equivalent to -std=c89 when it comes to linking

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50330

            Bug ID: 50330
           Summary: -ansi is not equivalent to -std=c89 when it comes to
                    linking
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: public at timruffing.de
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Test case:

Setup:
# echo "int main(void){return 0;}" > test.c
# clang -c -o test.o test.c

Now this just works fine:
# clang -std=c89 -o test test.o

But this outputs a warning:
# clang -ansi -o test test.o

clang-11: warning: argument unused during compilation: '-ansi'
[-Wunused-command-line-argument]

The man page describes -ansi as "Same as -std=c89."

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