packages: Add `native-search-paths' field and honor it.

* guix/packages.scm (<search-path-specification>): New record type.
  (search-path-specification->sexp): New procedure.
  (<package>)[native-search-paths]: New field.
  (package-derivation): Accumulate the search paths, and pass them
  as #:search-paths toe BUILDER.
* guix/build-system/gnu.scm (gnu-build): Add #:search-paths.  Compute
  `implicit-search-paths'.  Pass #:search-paths in BUILDER.
* guix/build-system/perl.scm (perl-build): Add #:search-paths, pass it
  to BUILDER with the search paths of PERL.
* guix/build-system/cmake.scm (cmake-build): Add #:search-paths, pass it
  to BUILDER.
* guix/build-system/trivial.scm (trivial-build): Add #:search-paths,
  ignore it.
* guix/build/gnu-build-system.scm (set-paths): Add #:search-paths.
  Remove explicit settings of CPATH, LIBRARY_PATH, and PKG_CONFIG_PATH.
  Instead, walk SEARCH-PATHS and call `set-path-environment-variable'
  for them.
* guix/build/perl-build-system.scm (perl-build): Remove PERL5LIB setting.
* tests/packages.scm ("search paths"): New test.
* gnu/packages/bootstrap.scm (%bootstrap-guile)[raw]: Add
  #:search-paths.
  (%bootstrap-gcc): Add `native-search-paths' field.
* gnu/packages/perl.scm (perl): Likewise.
* gnu/packages/pkg-config.scm (pkg-config): Likewise.
* gnu/packages/glib.scm (intltool): Remove `arguments'.
* gnu/packages/avahi.scm (avahi): Remove #:phases.

2 files changed, 8 insertions, 16 deletions

diff --git a/guix/build/gnu-build-system.scm b/guix/build/gnu-build-system.scm
index 891c30df8f..94a7d6bca8 100644
--- a/guix/build/gnu-build-system.scm
+++ b/guix/build/gnu-build-system.scm
@@ -48,26 +48,22 @@
                     #f
                     dir))
 
-(define* (set-paths #:key inputs
+(define* (set-paths #:key inputs (search-paths '())
                     #:allow-other-keys)
   (define input-directories
     (match inputs
       (((_ . dir) ...)
        dir)))
 
-  (set-path-environment-variable "PATH" '("bin")
-                                 input-directories)
-  (set-path-environment-variable "CPATH" '("include")
-                                 input-directories)
-  (set-path-environment-variable "LIBRARY_PATH" '("lib" "lib64")
+  (set-path-environment-variable "PATH" '("bin" "sbin")
                                  input-directories)
 
-  ;; FIXME: Eventually move this to the `search-paths' field of the
-  ;; `pkg-config' package.
-  (set-path-environment-variable "PKG_CONFIG_PATH"
-                                 '("lib/pkgconfig" "lib64/pkgconfig"
-                                   "share/pkgconfig")
-                                 input-directories)
+  (for-each (match-lambda
+             ((env-var (directories ...) separator)
+              (set-path-environment-variable env-var directories
+                                             input-directories
+                                             #:separator separator)))
+            search-paths)
 
   ;; Dump the environment variables as a shell script, for handy debugging.
   (system "export > environment-variables"))
diff --git a/guix/build/perl-build-system.scm b/guix/build/perl-build-system.scm
index d625ef3ed6..793b6aacb5 100644
--- a/guix/build/perl-build-system.scm
+++ b/guix/build/perl-build-system.scm
@@ -50,10 +50,6 @@
 (define* (perl-build #:key inputs (phases %standard-phases)
                      #:allow-other-keys #:rest args)
   "Build the given Perl package, applying all of PHASES in order."
-  (set-path-environment-variable "PERL5LIB" '("lib/perl5/site_perl")
-                                 (match inputs
-                                   (((_ . path) ...)
-                                    path)))
   (apply gnu:gnu-build
          #:inputs inputs #:phases phases
          args))