#14214: Users guide lies about default optimization level -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Documentation | Unknown/Multiple bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Description changed by bgamari: Old description:

#14208 points out that the users guide claims that the default optimization level is `-O0`. However this apparently isn't true. We should decide whether this should be the default and, if so, identify and fix the differences.

New description: ticket:14208#comment:5 points out that the users guide claims that the default optimization level is `-O0`. However this apparently isn't true. We should decide whether this should be the default and, if so, identify and fix the differences. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14214#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#14214: Users guide lies about default optimization level -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Documentation | Unknown/Multiple bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * owner: (none) => bgamari -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14214#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#14214: Users guide lies about default optimization level -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Documentation | Unknown/Multiple bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): In response to comment:2: Regarding (2): It would be great to have the documentation specify precisely which flags each of the optimisation levels implies. However, I think we would ideally like to have these lists generated from the implementation; otherwise it's only a matter of time until they fall out- of-date. Regarding (3): I believe that as of b2b416014e4276ebb660d85c3a612f7ca45ade78 there is now such a mention. Regarding (4): Indeed, it looks like this has been out-of-date for quite a long time; I don't remember a time when `-v` told you anything about which optimisation flags were used. Regarding (5): I absolutely agree. The documentation for some of these flags is incredibly confusing. What makes things complicated is that `-fopt-coercion` doesn't currently exist. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14214#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#14214: Users guide lies about default optimization level -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Documentation | Unknown/Multiple bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4098 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari ): In [changeset:"2c23fff2e03e77187dc4d01f325f5f43a0e7cad2/ghc" 2c23fff2/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="2c23fff2e03e77187dc4d01f325f5f43a0e7cad2" user-guide: Clarify default optimization flags Begins to fix #14214. [skip ci] Test Plan: Read it. Reviewers: austin Subscribers: rwbarton, thomie GHC Trac Issues: #14214 Differential Revision: https://phabricator.haskell.org/D4098 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14214#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler