1##                                                          -*- Autoconf -*-
2# Copyright (C) 1999-2013 Free Software Foundation, Inc.
3#
4# This file is free software; the Free Software Foundation
5# gives unlimited permission to copy and/or distribute it,
6# with or without modifications, as long as this notice is preserved.
7
8
9# There are a few dirty hacks below to avoid letting 'AC_PROG_CC' be
10# written in clear, in which case automake, when reading aclocal.m4,
11# will think it sees a *use*, and therefore will trigger all it's
12# C support machinery.  Also note that it means that autoscan, seeing
13# CC etc. in the Makefile, will ask for an AC_PROG_CC use...
14
15
16# _AM_DEPENDENCIES(NAME)
17# ----------------------
18# See how the compiler implements dependency checking.
19# NAME is "CC", "CXX", "OBJC", "OBJCXX", "UPC", or "GJC".
20# We try a few techniques and use that to set a single cache variable.
21#
22# We don't AC_REQUIRE the corresponding AC_PROG_CC since the latter was
23# modified to invoke _AM_DEPENDENCIES(CC); we would have a circular
24# dependency, and given that the user is not expected to run this macro,
25# just rely on AC_PROG_CC.
26AC_DEFUN([_AM_DEPENDENCIES],
27[AC_REQUIRE([AM_SET_DEPDIR])dnl
28AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])dnl
29AC_REQUIRE([AM_MAKE_INCLUDE])dnl
30AC_REQUIRE([AM_DEP_TRACK])dnl
31
32m4_if([$1], [CC],   [depcc="$CC"   am_compiler_list=],
33      [$1], [CXX],  [depcc="$CXX"  am_compiler_list=],
34      [$1], [OBJC], [depcc="$OBJC" am_compiler_list='gcc3 gcc'],
35      [$1], [OBJCXX], [depcc="$OBJCXX" am_compiler_list='gcc3 gcc'],
36      [$1], [UPC],  [depcc="$UPC"  am_compiler_list=],
37      [$1], [GCJ],  [depcc="$GCJ"  am_compiler_list='gcc3 gcc'],
38                    [depcc="$$1"   am_compiler_list=])
39
40AC_CACHE_CHECK([dependency style of $depcc],
41               [am_cv_$1_dependencies_compiler_type],
42[if test -z "$AMDEP_TRUE" && test -f "$am_depcomp"; then
43  # We make a subdir and do the tests there.  Otherwise we can end up
44  # making bogus files that we don't know about and never remove.  For
45  # instance it was reported that on HP-UX the gcc test will end up
46  # making a dummy file named 'D' -- because '-MD' means "put the output
47  # in D".
48  rm -rf conftest.dir
49  mkdir conftest.dir
50  # Copy depcomp to subdir because otherwise we won't find it if we're
51  # using a relative directory.
52  cp "$am_depcomp" conftest.dir
53  cd conftest.dir
54  # We will build objects and dependencies in a subdirectory because
55  # it helps to detect inapplicable dependency modes.  For instance
56  # both Tru64's cc and ICC support -MD to output dependencies as a
57  # side effect of compilation, but ICC will put the dependencies in
58  # the current directory while Tru64 will put them in the object
59  # directory.
60  mkdir sub
61
62  am_cv_$1_dependencies_compiler_type=none
63  if test "$am_compiler_list" = ""; then
64     am_compiler_list=`sed -n ['s/^#*\([a-zA-Z0-9]*\))$/\1/p'] < ./depcomp`
65  fi
66  am__universal=false
67  m4_case([$1], [CC],
68    [case " $depcc " in #(
69     *\ -arch\ *\ -arch\ *) am__universal=true ;;
70     esac],
71    [CXX],
72    [case " $depcc " in #(
73     *\ -arch\ *\ -arch\ *) am__universal=true ;;
74     esac])
75
76  for depmode in $am_compiler_list; do
77    # Setup a source with many dependencies, because some compilers
78    # like to wrap large dependency lists on column 80 (with \), and
79    # we should not choose a depcomp mode which is confused by this.
80    #
81    # We need to recreate these files for each test, as the compiler may
82    # overwrite some of them when testing with obscure command lines.
83    # This happens at least with the AIX C compiler.
84    : > sub/conftest.c
85    for i in 1 2 3 4 5 6; do
86      echo '#include "conftst'$i'.h"' >> sub/conftest.c
87      # Using ": > sub/conftst$i.h" creates only sub/conftst1.h with
88      # Solaris 10 /bin/sh.
89      echo '/* dummy */' > sub/conftst$i.h
90    done
91    echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf
92
93    # We check with '-c' and '-o' for the sake of the "dashmstdout"
94    # mode.  It turns out that the SunPro C++ compiler does not properly
95    # handle '-M -o', and we need to detect this.  Also, some Intel
96    # versions had trouble with output in subdirs.
97    am__obj=sub/conftest.${OBJEXT-o}
98    am__minus_obj="-o $am__obj"
99    case $depmode in
100    gcc)
101      # This depmode causes a compiler race in universal mode.
102      test "$am__universal" = false || continue
103      ;;
104    nosideeffect)
105      # After this tag, mechanisms are not by side-effect, so they'll
106      # only be used when explicitly requested.
107      if test "x$enable_dependency_tracking" = xyes; then
108	continue
109      else
110	break
111      fi
112      ;;
113    msvc7 | msvc7msys | msvisualcpp | msvcmsys)
114      # This compiler won't grok '-c -o', but also, the minuso test has
115      # not run yet.  These depmodes are late enough in the game, and
116      # so weak that their functioning should not be impacted.
117      am__obj=conftest.${OBJEXT-o}
118      am__minus_obj=
119      ;;
120    none) break ;;
121    esac
122    if depmode=$depmode \
123       source=sub/conftest.c object=$am__obj \
124       depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
125       $SHELL ./depcomp $depcc -c $am__minus_obj sub/conftest.c \
126         >/dev/null 2>conftest.err &&
127       grep sub/conftst1.h sub/conftest.Po > /dev/null 2>&1 &&
128       grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
129       grep $am__obj sub/conftest.Po > /dev/null 2>&1 &&
130       ${MAKE-make} -s -f confmf > /dev/null 2>&1; then
131      # icc doesn't choke on unknown options, it will just issue warnings
132      # or remarks (even with -Werror).  So we grep stderr for any message
133      # that says an option was ignored or not supported.
134      # When given -MP, icc 7.0 and 7.1 complain thusly:
135      #   icc: Command line warning: ignoring option '-M'; no argument required
136      # The diagnosis changed in icc 8.0:
137      #   icc: Command line remark: option '-MP' not supported
138      if (grep 'ignoring option' conftest.err ||
139          grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
140        am_cv_$1_dependencies_compiler_type=$depmode
141        break
142      fi
143    fi
144  done
145
146  cd ..
147  rm -rf conftest.dir
148else
149  am_cv_$1_dependencies_compiler_type=none
150fi
151])
152AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type])
153AM_CONDITIONAL([am__fastdep$1], [
154  test "x$enable_dependency_tracking" != xno \
155  && test "$am_cv_$1_dependencies_compiler_type" = gcc3])
156])
157
158
159# AM_SET_DEPDIR
160# -------------
161# Choose a directory name for dependency files.
162# This macro is AC_REQUIREd in _AM_DEPENDENCIES.
163AC_DEFUN([AM_SET_DEPDIR],
164[AC_REQUIRE([AM_SET_LEADING_DOT])dnl
165AC_SUBST([DEPDIR], ["${am__leading_dot}deps"])dnl
166])
167
168
169# AM_DEP_TRACK
170# ------------
171AC_DEFUN([AM_DEP_TRACK],
172[AC_ARG_ENABLE([dependency-tracking], [dnl
173AS_HELP_STRING(
174  [--enable-dependency-tracking],
175  [do not reject slow dependency extractors])
176AS_HELP_STRING(
177  [--disable-dependency-tracking],
178  [speeds up one-time build])])
179if test "x$enable_dependency_tracking" != xno; then
180  am_depcomp="$ac_aux_dir/depcomp"
181  AMDEPBACKSLASH='\'
182  am__nodep='_no'
183fi
184AM_CONDITIONAL([AMDEP], [test "x$enable_dependency_tracking" != xno])
185AC_SUBST([AMDEPBACKSLASH])dnl
186_AM_SUBST_NOTMAKE([AMDEPBACKSLASH])dnl
187AC_SUBST([am__nodep])dnl
188_AM_SUBST_NOTMAKE([am__nodep])dnl
189])
190