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Summary: While the backend code of FileCheck relies on definition of variable from the command-line to have an equal sign '=' and a variable name before that, the frontend does not actually enforce it. This leads to FileCheck crashing when invoked with invalid syntax for the -D option. This patch adds the missing validation in the frontend. It also makes the -D option an AlwaysPrefix option to be able to detect -D=FOO as being a define without variable and -D as missing its value. Copyright: - Linaro (changes in version 2 of revision D55940) - GraphCore (changes in later versions) Reviewers: jdenny Subscribers: JonChesterfield, hiraditya, kristina, probinson, llvm-commits Differential Revision: https://reviews.llvm.org/D55940 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353173 91177308-0d34-0410-b5e6-96231b3b80d8