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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="../Issues/iss066_w.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="../Issues/iss067.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="../Issues/iss068_w.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>Issue COMPILER-VERBOSITY Writeup</H2>
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<PRE><B>Forum:</B> Compiler<P>
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<B>Issue:</B> <A HREF="iss067.htm">COMPILER-VERBOSITY</A><P>
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<B>References:</B> CLtL p. 438-329; 426<P>
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issue <A HREF="iss065.htm">COMPILER-DIAGNOSTICS</A><P>
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<B>Category:</B> ENHANCEMENT<P>
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<B>Edit History:</B> V1, 25 Oct 1988, Sandra Loosemore<P>
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V2, 12 Dec 1988, Dan L. Pierson (add USE-CONDITIONS)<P>
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V3, 15 Dec 1988, Dan L. Pierson (expand on conditions)<P>
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V4, 21 Dec 1988, Dan L. Pierson (reword and clarify)<P>
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V5, 06 Jan 1989, Sandra Loosemore (update discussion)<P>
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V6, 26 Jan 1989, Sandra Loosemore (remove USE-CONDITIONS)<P>
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<B>Status:</B> Ready for release<P>
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<P>
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<P>
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<B>Problem Description:<P>
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</B><P>
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Implementations vary widely in the amount of information that is printed<P>
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out by <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A>. In some situations, it would be useful to control<P>
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how much information is printed.<P>
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<P>
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<P>
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<B>Proposal COMPILER-VERBOSITY:LIKE-LOAD:<P>
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</B><P>
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Introduce special variables, <A REL=DEFINITION HREF="../Body/v_cmp_pr.htm#STcompile-verboseST"><B>*COMPILE-VERBOSE*</B></A> and <A REL=DEFINITION HREF="../Body/v_cmp_pr.htm#STcompile-printST"><B>*COMPILE-PRINT*</B></A>,<P>
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with implementation-dependent initial values.<P>
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<P>
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Add :VERBOSE and :PRINT keyword arguments to the function<P>
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<A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A>, analogous to those for the function <A REL=DEFINITION HREF="../Body/f_load.htm#load"><B>LOAD</B></A>.<P>
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<P>
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The :VERBOSE argument (which defaults to the value of<P>
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<A REL=DEFINITION HREF="../Body/v_cmp_pr.htm#STcompile-verboseST"><B>*COMPILE-VERBOSE*</B></A>), if true, permits <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A> to print a message<P>
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in the form of a comment to <A REL=DEFINITION HREF="../Body/v_debug_.htm#STstandard-outputST"><B>*STANDARD-OUTPUT*</B></A> indicating what file is<P>
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being compiled and other useful information.<P>
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<P>
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The :PRINT argument (which defaults to the value of <A REL=DEFINITION HREF="../Body/v_cmp_pr.htm#STcompile-printST"><B>*COMPILE-PRINT*</B></A>),<P>
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if true, causes information about top-level forms in the file being<P>
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compiled to be printed to <A REL=DEFINITION HREF="../Body/v_debug_.htm#STstandard-outputST"><B>*STANDARD-OUTPUT*</B></A>. Exactly what is printed<P>
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will vary from implementation to implementation, but nevertheless some<P>
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information will be printed.<P>
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<P>
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Introduce a special variable <A REL=DEFINITION HREF="../Body/v_ld_prs.htm#STload-printST"><B>*LOAD-PRINT*</B></A>, which has an initial value of<P>
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<A REL=DEFINITION HREF="../Body/a_nil.htm#nil"><B>NIL</B></A>. State that the default value of the :PRINT argument to <A REL=DEFINITION HREF="../Body/f_load.htm#load"><B>LOAD</B></A> is<P>
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<A REL=DEFINITION HREF="../Body/v_ld_prs.htm#STload-printST"><B>*LOAD-PRINT*</B></A> (rather than <A REL=DEFINITION HREF="../Body/a_nil.htm#nil"><B>NIL</B></A>).<P>
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<P>
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<P>
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<B>Rationale:<P>
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</B><P>
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This proposal makes <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A> behave like <A REL=DEFINITION HREF="../Body/f_load.htm#load"><B>LOAD</B></A>. There is already<P>
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some precedent for doing this (for example, issue <A HREF="iss061.htm">COMPILE-FILE-PACKAGE</A>,<P>
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which makes <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A> as well as <A REL=DEFINITION HREF="../Body/f_load.htm#load"><B>LOAD</B></A> rebind <A REL=DEFINITION HREF="../Body/v_pkg.htm#STpackageST"><B>*PACKAGE*</B></A>).<P>
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<P>
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Adding the <A REL=DEFINITION HREF="../Body/v_ld_prs.htm#STload-printST"><B>*LOAD-PRINT*</B></A> variable allows the printing of messages by<P>
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<A REL=DEFINITION HREF="../Body/f_load.htm#load"><B>LOAD</B></A> to be controlled either on a global or a per-call basis.<P>
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<P>
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<P>
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<B>Current Practice:<P>
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</B><P>
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<A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A> prints out progress messages in nearly all<P>
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implementations.<P>
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<P>
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Lucid provides a :MESSAGES keyword argument to <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A>, which can<P>
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either be a stream to send messages to, or <A REL=DEFINITION HREF="../Body/a_nil.htm#nil"><B>NIL</B></A> to suppress messages.<P>
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The default value is T, which sends messages to "the <A REL=DEFINITION HREF="../Body/07_ffb.htm#standard"><B>standard</B></A> terminal<P>
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device".<P>
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<P>
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On the TI Explorer, <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A> displays the name of the function<P>
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being compiled when the option :VERBOSE T is given or special variable<P>
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COMPILER:COMPILER-VERBOSE is true. (In other words, they use :VERBOSE<P>
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to mean what this proposal says to use :PRINT for.)<P>
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<P>
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Symbolics Cloe already has a <A REL=DEFINITION HREF="../Body/v_ld_prs.htm#STload-printST"><B>*LOAD-PRINT*</B></A> variable.<P>
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<P>
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<P>
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<B>Cost to implementors:<P>
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</B><P>
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This is an incompatible change for some implementations. While the<P>
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changes required should be conceptually simple, their implementation<P>
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may involve a significant amount of grunt work. At least two<P>
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implementations already <A REL=DEFINITION HREF="../Body/f_provid.htm#provide"><B>provide</B></A> some similar mechanism for suppressing<P>
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messages.<P>
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<P>
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<P>
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<B>Cost to users:<P>
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</B><P>
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Some (non-portable) user code may break in implementations where this<P>
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is an incompatible change.<P>
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<P>
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No user code should be broken by the addition of the <A REL=DEFINITION HREF="../Body/v_ld_prs.htm#STload-printST"><B>*LOAD-PRINT*</B></A><P>
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variable, since the default behavior for the :PRINT keyword to <A REL=DEFINITION HREF="../Body/f_load.htm#load"><B>LOAD</B></A> <P>
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is unchanged.<P>
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<P>
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<P>
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<B>Benefits:<P>
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</B><P>
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Users are given a portable way to control how much information is printed<P>
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by <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A>.<P>
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<P>
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<P>
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<B>Discussion:<P>
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</B><P>
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This issue addresses an extension to the language. If this proposal<P>
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is not accepted, the <A REL=DEFINITION HREF="../Body/07_ffb.htm#standard"><B>standard</B></A> will simply continue not to say anything<P>
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about whether <A REL=DEFINITION HREF="../Body/f_cmp_fi.htm#compile-file"><B>COMPILE-FILE</B></A> can print progress messages, or what stream<P>
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such messages are directed to.<P>
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<P>
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</PRE>
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