08/11: build: Add 'HELP2MAN' silent rule.

[Mathieu Lirzin]

mthl pushed a commit to branch master
in repository guix.

commit 8dddedf778f85c3356466ed028ff3c2c6fedb44f
Author: Mathieu Lirzin <address@hidden>
Date:   Sun Jan 24 19:00:27 2016 +0100

    build: Add 'HELP2MAN' silent rule.
    
    * Makefile.am (AM_V_HELP2MAN, AM_V_HELP2MAN_, AM_V_HELP2MAN_0): New
    variables.
    * doc.am (subcommand-manual-target, doc/guix.1, doc/guix-daemon.1): Use
    $(AM_V_HELP2MAN).
---
 Makefile.am |    4 ++++
 doc.am      |    6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 2fa1269..bc015e2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -488,3 +488,7 @@ AM_V_DOT_0 = @echo "  DOT     " $@;
 AM_V_EMACS = $(AM_V_EMACS_$(V))
 AM_V_EMACS_ = $(AM_V_EMACS_$(AM_DEFAULT_VERBOSITY))
 AM_V_EMACS_0 = @echo "  EMACS   " $@;
+
+AM_V_HELP2MAN = $(AM_V_HELP2MAN_$(V))
+AM_V_HELP2MAN_ = $(AM_V_HELP2MAN_$(AM_DEFAULT_VERBOSITY))
+AM_V_HELP2MAN_0 = @echo "  HELP2MAN" $@;
diff --git a/doc.am b/doc.am
index 045e930..8b8ecc7 100644
--- a/doc.am
+++ b/doc.am
@@ -95,19 +95,19 @@ dvi-local: ps-local
 # Manual pages.
 
 doc/guix.1: $(SUBCOMMANDS:%=guix/scripts/%.scm)
-       -LANGUAGE= $(top_builddir)/pre-inst-env \
+       -$(AM_V_HELP2MAN)LANGUAGE= $(top_builddir)/pre-inst-env         \
          $(HELP2MAN) --output="$@" guix
 
 # Note: Do not depend on 'guix-daemon' since that would trigger a rebuild even
 # for people building from a tarball.
 doc/guix-daemon.1: nix/nix-daemon/guix-daemon.cc
-       -LANGUAGE= $(top_builddir)/pre-inst-env \
+       -$(AM_V_HELP2MAN)LANGUAGE= $(top_builddir)/pre-inst-env         \
          $(HELP2MAN) --output="$@" guix-daemon
 
 define subcommand-manual-target
 
 doc/guix-$(1).1: guix/scripts/$(1).scm
-       -LANGUAGE= $(top_builddir)/pre-inst-env         \
+       -$$(AM_V_HELP2MAN)LANGUAGE= $(top_builddir)/pre-inst-env        \
          $(HELP2MAN) --output="$$@" "guix $(1)"
 
 endef