cpp_sys_macro_p crashes when -ftrack-macro-expansion is on. The issue can be reproduced by running the tests: runtest --tool gcc --tool_opts="-ftrack-macro-expansion" cpp.exp=sysmac1.c runtest --tool gcc --tool_opts="-ftrack-macro-expansion" cpp.exp=sysmac2.c This is because it just doesn't support that mode. Fixed thus. Tested and bootstrapped on x86_64-unknown-linux-gnu against trunk. Note that the bootstrap with -ftrack-macro-expansion turned on exhibits other separate issues that are addressed in subsequent patches. This patch just fixes one class of problems. The patch does pass bootstrap with -ftrack-macro-expansion turned off, though. libcpp/ * macro.c (cpp_sys_macro_p): Support -ftrack-macro-expansion. From-SVN: r186965
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