2 # Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2009,
3 # 2010, 2011 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
11 # There are a few dirty hacks below to avoid letting `AC_PROG_CC' be
12 # written in clear, in which case automake, when reading aclocal.m4,
13 # will think it sees a *use*, and therefore will trigger all it's
14 # C support machinery. Also note that it means that autoscan, seeing
15 # CC etc. in the Makefile, will ask for an AC_PROG_CC use...
18 # _AM_DEPENDENCIES(NAME)
19 # ----------------------
20 # See how the compiler implements dependency checking.
21 # NAME is "CC", "CXX", "GCJ", or "OBJC".
22 # We try a few techniques and use that to set a single cache variable.
24 # We don't AC_REQUIRE the corresponding AC_PROG_CC since the latter was
25 # modified to invoke _AM_DEPENDENCIES(CC); we would have a circular
26 # dependency, and given that the user is not expected to run this macro,
27 # just rely on AC_PROG_CC.
28 AC_DEFUN([_AM_DEPENDENCIES],
29 [AC_REQUIRE([AM_SET_DEPDIR])dnl
30 AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])dnl
31 AC_REQUIRE([AM_MAKE_INCLUDE])dnl
32 AC_REQUIRE([AM_DEP_TRACK])dnl
34 ifelse([$1], CC, [depcc="$CC" am_compiler_list=],
35 [$1], CXX, [depcc="$CXX" am_compiler_list=],
36 [$1], OBJC, [depcc="$OBJC" am_compiler_list='gcc3 gcc'],
37 [$1], UPC, [depcc="$UPC" am_compiler_list=],
38 [$1], GCJ, [depcc="$GCJ" am_compiler_list='gcc3 gcc'],
39 [depcc="$$1" am_compiler_list=])
41 AC_CACHE_CHECK([dependency style of $depcc],
42 [am_cv_$1_dependencies_compiler_type],
43 [if test -z "$AMDEP_TRUE" && test -f "$am_depcomp"; then
44 # We make a subdir and do the tests there. Otherwise we can end up
45 # making bogus files that we don't know about and never remove. For
46 # instance it was reported that on HP-UX the gcc test will end up
47 # making a dummy file named `D' -- because `-MD' means `put the output
51 # Copy depcomp to subdir because otherwise we won't find it if we're
52 # using a relative directory.
53 cp "$am_depcomp" conftest.dir
55 # We will build objects and dependencies in a subdirectory because
56 # it helps to detect inapplicable dependency modes. For instance
57 # both Tru64's cc and ICC support -MD to output dependencies as a
58 # side effect of compilation, but ICC will put the dependencies in
59 # the current directory while Tru64 will put them in the object
63 am_cv_$1_dependencies_compiler_type=none
64 if test "$am_compiler_list" = ""; then
65 am_compiler_list=`sed -n ['s/^#*\([a-zA-Z0-9]*\))$/\1/p'] < ./depcomp`
69 [case " $depcc " in #(
70 *\ -arch\ *\ -arch\ *) am__universal=true ;;
73 [case " $depcc " in #(
74 *\ -arch\ *\ -arch\ *) am__universal=true ;;
77 for depmode in $am_compiler_list; do
78 # Setup a source with many dependencies, because some compilers
79 # like to wrap large dependency lists on column 80 (with \), and
80 # we should not choose a depcomp mode which is confused by this.
82 # We need to recreate these files for each test, as the compiler may
83 # overwrite some of them when testing with obscure command lines.
84 # This happens at least with the AIX C compiler.
86 for i in 1 2 3 4 5 6; do
87 echo '#include "conftst'$i'.h"' >> sub/conftest.c
88 # Using `: > sub/conftst$i.h' creates only sub/conftst1.h with
89 # Solaris 8's {/usr,}/bin/sh.
92 echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf
94 # We check with `-c' and `-o' for the sake of the "dashmstdout"
95 # mode. It turns out that the SunPro C++ compiler does not properly
96 # handle `-M -o', and we need to detect this. Also, some Intel
97 # versions had trouble with output in subdirs
98 am__obj=sub/conftest.${OBJEXT-o}
99 am__minus_obj="-o $am__obj"
102 # This depmode causes a compiler race in universal mode.
103 test "$am__universal" = false || continue
106 # after this tag, mechanisms are not by side-effect, so they'll
107 # only be used when explicitly requested
108 if test "x$enable_dependency_tracking" = xyes; then
114 msvisualcpp | msvcmsys)
115 # This compiler won't grok `-c -o', but also, the minuso test has
116 # not run yet. These depmodes are late enough in the game, and
117 # so weak that their functioning should not be impacted.
118 am__obj=conftest.${OBJEXT-o}
123 if depmode=$depmode \
124 source=sub/conftest.c object=$am__obj \
125 depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
126 $SHELL ./depcomp $depcc -c $am__minus_obj sub/conftest.c \
127 >/dev/null 2>conftest.err &&
128 grep sub/conftst1.h sub/conftest.Po > /dev/null 2>&1 &&
129 grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
130 grep $am__obj sub/conftest.Po > /dev/null 2>&1 &&
131 ${MAKE-make} -s -f confmf > /dev/null 2>&1; then
132 # icc doesn't choke on unknown options, it will just issue warnings
133 # or remarks (even with -Werror). So we grep stderr for any message
134 # that says an option was ignored or not supported.
135 # When given -MP, icc 7.0 and 7.1 complain thusly:
136 # icc: Command line warning: ignoring option '-M'; no argument required
137 # The diagnosis changed in icc 8.0:
138 # icc: Command line remark: option '-MP' not supported
139 if (grep 'ignoring option' conftest.err ||
140 grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
141 am_cv_$1_dependencies_compiler_type=$depmode
150 am_cv_$1_dependencies_compiler_type=none
153 AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type])
154 AM_CONDITIONAL([am__fastdep$1], [
155 test "x$enable_dependency_tracking" != xno \
156 && test "$am_cv_$1_dependencies_compiler_type" = gcc3])
162 # Choose a directory name for dependency files.
163 # This macro is AC_REQUIREd in _AM_DEPENDENCIES
164 AC_DEFUN([AM_SET_DEPDIR],
165 [AC_REQUIRE([AM_SET_LEADING_DOT])dnl
166 AC_SUBST([DEPDIR], ["${am__leading_dot}deps"])dnl
172 AC_DEFUN([AM_DEP_TRACK],
173 [AC_ARG_ENABLE(dependency-tracking,
174 [ --disable-dependency-tracking speeds up one-time build
175 --enable-dependency-tracking do not reject slow dependency extractors])
176 if test "x$enable_dependency_tracking" != xno; then
177 am_depcomp="$ac_aux_dir/depcomp"
181 AM_CONDITIONAL([AMDEP], [test "x$enable_dependency_tracking" != xno])
182 AC_SUBST([AMDEPBACKSLASH])dnl
183 _AM_SUBST_NOTMAKE([AMDEPBACKSLASH])dnl
184 AC_SUBST([am__nodep])dnl
185 _AM_SUBST_NOTMAKE([am__nodep])dnl