[bug#35054] [PATCH core-updates] guix: cmake-build-system: Add option '#:glib-or-gtk?'.

[Timo Eisenmann <eisenmann@fn.de>]

* guix/build-system/cmake.scm (%cmake-build-system-modules): Use
%gnu-build-system-modules instead of %glib-or-gtk-build-system-modules.
(lower): Add key 'glib-or-gtk?', defaulting to #f.
(cmake-build): Same.
[builder]: If 'glib-or-gtk?' is #f, remove phases 'glib-or-gtk-compile-schemas'
and 'glib-or-gtk-wrap'.
* guix/build/cmake-build-system.scm (%standard-phases): Use %standard-phases
from 'glib-or-gtk-build-system' instead of 'gnu-build-system'.
* doc/guix.texi (Build Systems): Document it.
---
 doc/guix.texi                     |  5 +++++
 guix/build-system/cmake.scm       | 16 ++++++++++++----
 guix/build/cmake-build-system.scm |  7 +++++--
 3 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 3afdccac75..3025c3c1e1 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -58,6 +58,7 @@ Copyright @copyright{} 2018 Gábor Boskovits@*
 Copyright @copyright{} 2018 Florian Pelz@*
 Copyright @copyright{} 2018 Laura Lazzati@*
 Copyright @copyright{} 2018 Alex Vong@*
+Copyright @copyright{} 2019 Timo Eisenmann@*
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -5795,6 +5796,10 @@ 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.
+
+The @code{#:glib-or-gtk?} parameter, when set to @code{#t}, adds the phases
+@code{glib-or-gtk-wrap} and @code{glib-or-gtk-compile-schemas} for packages
+making use of GLib or GTK+.  It defaults to @code{#f}.
 @end defvr
 
 @defvr {Scheme Variable} dune-build-system
diff --git a/guix/build-system/cmake.scm b/guix/build-system/cmake.scm
index ca88fadddf..f9aee3a46e 100644
--- a/guix/build-system/cmake.scm
+++ b/guix/build-system/cmake.scm
@@ -25,6 +25,7 @@
   #:use-module (guix search-paths)
   #:use-module (guix build-system)
   #:use-module (guix build-system gnu)
+  #:use-module (guix build-system glib-or-gtk)
   #:use-module (guix packages)
   #:use-module (ice-9 match)
   #:export (%cmake-build-system-modules
@@ -34,14 +35,15 @@
 ;; Commentary:
 ;;
 ;; Standard build procedure for packages using CMake. This is implemented as an
-;; extension of `gnu-build-system'.
+;; extension of `gnu-build-system', with the option to turn on the glib/gtk
+;; phases from `glib-or-gtk-build-system'.
 ;;
 ;; Code:
 
 (define %cmake-build-system-modules
   ;; Build-side modules imported by default.
   `((guix build cmake-build-system)
-    ,@%gnu-build-system-modules))
+    ,@%glib-or-gtk-build-system-modules))
 
 (define (default-cmake)
   "Return the default CMake package."
@@ -53,6 +55,7 @@
 (define* (lower name
                 #:key source inputs native-inputs outputs system target
                 (cmake (default-cmake))
+                (glib-or-gtk? #f)
                 #:allow-other-keys
                 #:rest arguments)
   "Return a bag for NAME."
@@ -99,6 +102,7 @@
                       (build-type "RelWithDebInfo")
                       (tests? #t)
                       (test-target "test")
+                      (glib-or-gtk? #f)
                       (parallel-build? #t) (parallel-tests? #f)
                       (validate-runpath? #t)
                       (patch-shebangs? #t)
@@ -115,7 +119,11 @@
   "Build SOURCE using CMAKE, and with INPUTS. This assumes that SOURCE
 provides a 'CMakeLists.txt' file as its build system."
   (define builder
-    `(begin
+    `(let ((build-phases (if ,glib-or-gtk?
+                             ,phases
+                             (modify-phases ,phases
+                               (delete 'glib-or-gtk-compile-schemas)
+                               (delete 'glib-or-gtk-wrap)))))
        (use-modules ,@modules)
        (cmake-build #:source ,(match (assoc-ref inputs "source")
                                 (((? derivation? source))
@@ -129,7 +137,7 @@ provides a 'CMakeLists.txt' file as its build system."
                     #:inputs %build-inputs
                     #:search-paths ',(map search-path-specification->sexp
                                           search-paths)
-                    #:phases ,phases
+                    #:phases build-phases
                     #:configure-flags ,configure-flags
                     #:make-flags ,make-flags
                     #:out-of-source? ,out-of-source?
diff --git a/guix/build/cmake-build-system.scm b/guix/build/cmake-build-system.scm
index 9b1112f2d6..17b671fc70 100644
--- a/guix/build/cmake-build-system.scm
+++ b/guix/build/cmake-build-system.scm
@@ -21,6 +21,7 @@
 
 (define-module (guix build cmake-build-system)
   #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module ((guix build glib-or-gtk-build-system) #:prefix glib-or-gtk:)
   #:use-module (guix build utils)
   #:use-module (ice-9 match)
   #:export (%standard-phases
@@ -84,8 +85,10 @@
 
 (define %standard-phases
   ;; Everything is as with the GNU Build System except for the `configure'
-  ;; and 'check' phases.
-  (modify-phases gnu:%standard-phases
+  ;; and 'check' phases.  Also, there are some extra phases for packages
+  ;; making use of GLib or GTK+, which will be removed if the glib-or-gtk? key
+  ;; is #f (the default).
+  (modify-phases glib-or-gtk:%standard-phases
     (delete 'bootstrap)
     (replace 'check check)
     (replace 'configure configure)))
-- 
2.21.0