make flags analysis: use simpler variable names

[platform/upstream/automake.git] / lib / am / header-vars.am

diff --git a/lib/am/header-vars.am b/lib/am/header-vars.am
index 59d8661..8698cd2 100644 (file)
--- a/lib/am/header-vars.am
+++ b/lib/am/header-vars.am
@@ -1,10 +1,9 @@
 ## automake - create Makefile.in from Makefile.am
-## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2003, 2005
-## Free Software Foundation, Inc.
+## Copyright (C) 1994-2013 Free Software Foundation, Inc.
 
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; either version 3, or (at your option)
+## the Free Software Foundation; either version 2, or (at your option)
 ## any later version.
 
 ## This program is distributed in the hope that it will be useful,
@@ -13,9 +12,7 @@
 ## GNU General Public License for more details.
 
 ## You should have received a copy of the GNU General Public License
-## along with this program; if not, write to the Free Software
-## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-## 02110-1301, USA.
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 VPATH = @srcdir@
 
@@ -29,6 +26,80 @@ VPATH = @srcdir@
 ## a vendor make.
 ## DESTDIR =
 
+## Shell code that determines whether we are running under GNU make.
+## This is somewhat of an hack, and might be improved, but is good
+## enough for now.
+am__is_gnu_make = test -n '$(MAKEFILE_LIST)' && test -n '$(MAKELEVEL)'
+
+## Shell code that determines whether the current make instance is
+## running with a given one-letter option (e.g., -k, -n) that takes
+## no argument.  Actually, the only supported option at the moment
+## is '-n' (support for '-k' will be added soon).
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+## The format of $(MAKEFLAGS) is quite tricky with GNU make; the
+## variable $(MFLAGS) behaves much better in that regard.  So use it.
+    sane_makeflags=$$MFLAGS; \
+  else \
+## Non-GNU make: we must rely on $(MAKEFLAGS).  This is tricker and more
+## brittle, but is the best we can do.
+    case $$MAKEFLAGS in \
+## If we run "make TESTS='snooze nap'", FreeBSD make will export MAKEFLAGS
+## to " TESTS=foo\ nap", so that the simpler loop below (on word-splitted
+## $$MAKEFLAGS) would see a "make flag" equal to "nap", and would wrongly
+## misinterpret that as and indication that make is running in dry mode.
+## This has already happened in practice.  So we need this hack.
+      *\\[\ \  ]*) \
+## Extra indirection with ${bs} required by FreeBSD 8.x make.
+## Not sure why (so sorry for the cargo-cult programming here).
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs  ]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+## GNU make 3.83 has changed the format of $MFLAGS, and removed the space
+## between an option and its argument (e.g., from "-I dir" to "-Idir").
+## So we need to handle both formats.
+## TODO: we might need to handle similar other cases as well; but let's
+##       wait until the need arises.
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+
+## Shell code that determines whether make is running in "dry mode"
+## ("make -n") or not.  Useful in rules that invoke make recursively,
+## and are thus executed also with "make -n" -- either because they
+## are declared as dependencies to '.MAKE' (NetBSD make), or because
+## their recipes contain the "$(MAKE)" string (GNU and Solaris make).
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+
+## Shell code that determines whether make is running in "keep-going mode"
+## ("make -k") or not.  Useful in rules that must recursively descend into
+## subdirectories, and decide whther to stop at the first error or not.
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+
 ## Some derived variables that have been found to be useful.
 pkgdatadir = $(datadir)/@PACKAGE@
 pkgincludedir = $(includedir)/@PACKAGE@