Bug 9680 – Include entry point location in "dmd -v -o-" output

This is an enhancement request. I would like it if dmd would print a line on the standard output when it encounters an entry point function ("main" or "WinMain"). Optionally, the module name where it was found should be printed as well. This will allow build tools, like rdmd, to react intelligently based on what is specified on the command-line. If there is no entry point defined, the build tool may select to skip linking, or build a library, instead of attempting to link an executable (which will likely fail due to lack of an entry point). In my case, it would allow creating a file manager association with .d files, such that executing the association on a main program file would compile and link the program, and executing the association on a component module would merely check the code for compilation errors.

From what I can tell there's 3 types of main functions: main WinMain DllMain So how would you like the output to be? It could be: binary E:\dmd-git\dmd2\windows\bin\dmd.exe version v2.063 config E:\dmd-git\dmd2\windows\bin\sc.ini parse Fix9680 importall test import object (E:\dmd-git\dmd2\windows\bin\..\..\src\druntime\import\object.di) import foo.bar (foo\bar.d) semantic test main foo\bar.d <- winmain foo\bar.d <- dllmain foo\bar.d <- semantic2 test semantic3 test code test Either one of the 3 marked with the arrow would show up, or perhaps you want some other way of marking them? I can have a pull ready soon.

Oh, good point about printing the entry point kind (winmain/dllmain)! Then the build tool could also do the right thing and build a DLL, or pass "/SUBSYSTEM:WINDOWS" to the linker. How about this format: entry main foo\bar.d "entry" is constant, "main" is the entry point kind (main/winmain/dllmain), and the third field is the path name. This leaves room for detecting other kinds of entry points if that's something that might happen (extern(C) main?)

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/4ca8a034c89c7c2bc8fe083d3770c0d17a176fcc Fixes Issue 9680 - Print main function and location in verbose mode. Add test-case script by Kenji Hara. https://github.com/D-Programming-Language/dmd/commit/39ffb26b35a9645a543331ab06fb2d8f68420cf7 Merge pull request #1732 from AndrejMitrovic/Fix9680 Issue 9680 - Print main function and location in verbose mode.

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/12c8c9d2500008ecb54d10500c69b10f9c0a685f Fixup test case for Issue 9680. https://github.com/D-Programming-Language/dmd/commit/2d8d2abbe5757c49a7ac08a0165822dc2bd29051 Merge pull request #1862 from AndrejMitrovic/Fixup9680 Fixup test case for Issue 9680.