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This patch fixes an issue where on systems that are HAVE_TARGET_EXECUTABLE_SUFFIX the driver calls convert_filename in order to add the suffix to the filename. However while it excludes `-` it doesn't exclude the null device. This patches changes the check to exclude anything that is not a file by calling not_actual_file_p instead. This also fixes a bug in not_actual_file_p which was accidentally testing a the global variable output_file instead of the supplied argument. This hasn't been an issue so far because because not_actual_file_p was only used on output_file till now. This fixes the adding of an extension to the nul device which is against the recommendations on msdn[0] and makes it harder for the next tool in line to detect it. Bootstrapped Regtested on x86_64-w64-mingw32 and no issues. Did do a bootstrap on x86_64-pc-linux-gnu but no regtest as it's not a HAVE_TARGET_EXECUTABLE_SUFFIX system. [0] https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file gcc/ChangeLog: PR driver/97574 * gcc.c (convert_filename): Don't add suffix to things that are not files. (not_actual_file_p): Use supplied argument.
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