build-system/cmake: Add #:build-type parameter, default to "RelWithDebInfo".

* guix/build-system/cmake.scm (cmake-build): Add #:build-type.  Pass it
  in BUILDER.
* guix/build/cmake-build-system.scm (configure): Add #:build-type
  parameter and honor it.
* doc/guix.texi (Build Systems): Document #:configure-flags and
  #:build-type for CMake.

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 5e8f8e6eb5..c75ca0c2c8 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -1621,6 +1621,13 @@ implements the build procedure for packages using the
 It automatically adds the @code{cmake} package to the set of inputs.
 Which package is used can be specified with the @code{#:cmake}
 parameter.
+
+The @code{#:configure-flags} parameter is taken as a list of flags
+passed to the @command{cmake} command.  The @code{#:build-type}
+parameter specifies in abstract terms the flags passed to the compiler;
+it defaults to @code{"RelWithDebInfo"} (short for ``release mode with
+debugging information''), which roughly means that code is compiled with
+@code{-O2 -g}, as is the case for Autoconf-based packages by default.
 @end defvr
 
 @defvr {Scheme Variable} python-build-system