Bug 19266 – Some source files names are no longer accepted

dmd can no longer read files from a network share: dmd \\network\share\test.d ... Error: module `test` is in file '\\network\share\test.d' which cannot be read You can also no longer pass in file names with the extension long file prefix: dmd \\?\c:\tmp\test.d ... Error: module `test` is in file '\\?\c:\tmp\test.d' which cannot be read Redirecting some output to special devices fails, too: dmd \\?\c:\tmp\test.d -deps nul: ... Error: invalid file name 'nul:' Introduced in dmd 2.078 by adding prefix \\?\ to filenames unconditionally. This can also confuse generic file tracking for dependency generation as used by msbuild.

Closing as it has been merged in stable

Commit pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/ac9272cd42a3a2c10639217abf98b166f9b12baf fix issue 19266 - Some source files names are no longer accepted only add the \\?\ prefix if the filename is actually long and does not start with \\ already.