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Re: CC=cc ./configure or ./configure CC=cc

From: Bruno Haible
Subject: Re: CC=cc ./configure or ./configure CC=cc
Date: Thu, 10 Aug 2006 14:14:39 +0200
User-agent: KMail/1.9.1

Ralf Wildenhues wrote:
>       * standards.texi (Configuration): Document that `configure'
>       should accept arguments of the form `VARIABLE=VALUE' and why
>       they are preferable over environment variables.
>       Suggested by Bruno Haible.

Looks quite good. Just two proposed further changes:

---   2006-08-10 14:03:50.000000000 +0200
+++        2006-08-10 14:08:28.000000000 +0200
@@ -3761,9 +3761,8 @@
 @cindex optional features, configure-time
 Other options are permitted to specify in more detail the software
-or hardware present on the machine, adjust the name of some tools
-or arguments to them, and include or exclude optional parts of the
+or hardware present on the machine, to include or exclude optional parts
+of the package, or to adjust the name of some tools or arguments to them:
 @table @samp
 @item address@hidden@address@hidden@r{]}
@@ -3801,7 +3800,9 @@
 Set the value of the variable @var{variable} to @var{value}.  This may
 be used to override some commands or arguments to values differing from
 the ones the build process would use otherwise.  For example, the user
-could issue @samp{configure CFLAGS=-g} to build with debugging symbols.
+could issue @samp{configure CFLAGS=-g CXXFLAGS=-g} to build with
+debugging information and without the default optimization.
 Specifying variables as arguments to @code{configure}:
 ./configure CC=gcc

The first one is to mention the options in the same order as they
appear in the table (otherwise it can be confusing).

The second one is because
  - -g not only adds symbols, but also line number information to an
  - CFLAGS=-g will have no effect if you happen to be compiling a C++
  - the default CFLAGS (when using gcc) being "-g -O2", one of the effects
    of CFLAGS=-g is to disable the optimisations which make debugging a
    big pain.


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