| 1 | ## -*- Autoconf -*-
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| 2 |
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| 3 | # Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005
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| 4 | # Free Software Foundation, Inc.
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| 5 | #
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| 6 | # This file is free software; the Free Software Foundation
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| 7 | # gives unlimited permission to copy and/or distribute it,
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| 8 | # with or without modifications, as long as this notice is preserved.
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| 9 |
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| 10 | # serial 8
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| 11 |
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| 12 | # There are a few dirty hacks below to avoid letting `AC_PROG_CC' be
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| 13 | # written in clear, in which case automake, when reading aclocal.m4,
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| 14 | # will think it sees a *use*, and therefore will trigger all it's
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| 15 | # C support machinery. Also note that it means that autoscan, seeing
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| 16 | # CC etc. in the Makefile, will ask for an AC_PROG_CC use...
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| 17 |
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| 18 |
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| 19 | # _AM_DEPENDENCIES(NAME)
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| 20 | # ----------------------
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| 21 | # See how the compiler implements dependency checking.
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| 22 | # NAME is "CC", "CXX", "GCJ", or "OBJC".
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| 23 | # We try a few techniques and use that to set a single cache variable.
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| 24 | #
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| 25 | # We don't AC_REQUIRE the corresponding AC_PROG_CC since the latter was
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| 26 | # modified to invoke _AM_DEPENDENCIES(CC); we would have a circular
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| 27 | # dependency, and given that the user is not expected to run this macro,
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| 28 | # just rely on AC_PROG_CC.
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| 29 | AC_DEFUN([_AM_DEPENDENCIES],
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| 30 | [AC_REQUIRE([AM_SET_DEPDIR])dnl
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| 31 | AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])dnl
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| 32 | AC_REQUIRE([AM_MAKE_INCLUDE])dnl
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| 33 | AC_REQUIRE([AM_DEP_TRACK])dnl
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| 34 |
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| 35 | ifelse([$1], CC, [depcc="$CC" am_compiler_list=],
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| 36 | [$1], CXX, [depcc="$CXX" am_compiler_list=],
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| 37 | [$1], OBJC, [depcc="$OBJC" am_compiler_list='gcc3 gcc'],
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| 38 | [$1], GCJ, [depcc="$GCJ" am_compiler_list='gcc3 gcc'],
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| 39 | [depcc="$$1" am_compiler_list=])
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| 40 |
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| 41 | AC_CACHE_CHECK([dependency style of $depcc],
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| 42 | [am_cv_$1_dependencies_compiler_type],
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| 43 | [if test -z "$AMDEP_TRUE" && test -f "$am_depcomp"; then
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| 44 | # We make a subdir and do the tests there. Otherwise we can end up
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| 45 | # making bogus files that we don't know about and never remove. For
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| 46 | # instance it was reported that on HP-UX the gcc test will end up
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| 47 | # making a dummy file named `D' -- because `-MD' means `put the output
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| 48 | # in D'.
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| 49 | mkdir conftest.dir
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| 50 | # Copy depcomp to subdir because otherwise we won't find it if we're
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| 51 | # using a relative directory.
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| 52 | cp "$am_depcomp" conftest.dir
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| 53 | cd conftest.dir
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| 54 | # We will build objects and dependencies in a subdirectory because
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| 55 | # it helps to detect inapplicable dependency modes. For instance
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| 56 | # both Tru64's cc and ICC support -MD to output dependencies as a
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| 57 | # side effect of compilation, but ICC will put the dependencies in
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| 58 | # the current directory while Tru64 will put them in the object
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| 59 | # directory.
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| 60 | mkdir sub
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| 61 |
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| 62 | am_cv_$1_dependencies_compiler_type=none
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| 63 | if test "$am_compiler_list" = ""; then
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| 64 | am_compiler_list=`sed -n ['s/^#*\([a-zA-Z0-9]*\))$/\1/p'] < ./depcomp`
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| 65 | fi
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| 66 | for depmode in $am_compiler_list; do
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| 67 | # Setup a source with many dependencies, because some compilers
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| 68 | # like to wrap large dependency lists on column 80 (with \), and
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| 69 | # we should not choose a depcomp mode which is confused by this.
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| 70 | #
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| 71 | # We need to recreate these files for each test, as the compiler may
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| 72 | # overwrite some of them when testing with obscure command lines.
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| 73 | # This happens at least with the AIX C compiler.
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| 74 | : > sub/conftest.c
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| 75 | for i in 1 2 3 4 5 6; do
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| 76 | echo '#include "conftst'$i'.h"' >> sub/conftest.c
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| 77 | # Using `: > sub/conftst$i.h' creates only sub/conftst1.h with
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| 78 | # Solaris 8's {/usr,}/bin/sh.
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| 79 | touch sub/conftst$i.h
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| 80 | done
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| 81 | echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf
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| 82 |
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| 83 | case $depmode in
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| 84 | nosideeffect)
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| 85 | # after this tag, mechanisms are not by side-effect, so they'll
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| 86 | # only be used when explicitly requested
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| 87 | if test "x$enable_dependency_tracking" = xyes; then
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| 88 | continue
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| 89 | else
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| 90 | break
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| 91 | fi
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| 92 | ;;
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| 93 | none) break ;;
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| 94 | esac
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| 95 | # We check with `-c' and `-o' for the sake of the "dashmstdout"
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| 96 | # mode. It turns out that the SunPro C++ compiler does not properly
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| 97 | # handle `-M -o', and we need to detect this.
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| 98 | if depmode=$depmode \
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| 99 | source=sub/conftest.c object=sub/conftest.${OBJEXT-o} \
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| 100 | depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
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| 101 | $SHELL ./depcomp $depcc -c -o sub/conftest.${OBJEXT-o} sub/conftest.c \
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| 102 | >/dev/null 2>conftest.err &&
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| 103 | grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
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| 104 | grep sub/conftest.${OBJEXT-o} sub/conftest.Po > /dev/null 2>&1 &&
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| 105 | ${MAKE-make} -s -f confmf > /dev/null 2>&1; then
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| 106 | # icc doesn't choke on unknown options, it will just issue warnings
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| 107 | # or remarks (even with -Werror). So we grep stderr for any message
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| 108 | # that says an option was ignored or not supported.
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| 109 | # When given -MP, icc 7.0 and 7.1 complain thusly:
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| 110 | # icc: Command line warning: ignoring option '-M'; no argument required
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| 111 | # The diagnosis changed in icc 8.0:
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| 112 | # icc: Command line remark: option '-MP' not supported
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| 113 | if (grep 'ignoring option' conftest.err ||
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| 114 | grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
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| 115 | am_cv_$1_dependencies_compiler_type=$depmode
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| 116 | break
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| 117 | fi
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| 118 | fi
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| 119 | done
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| 120 |
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| 121 | cd ..
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| 122 | rm -rf conftest.dir
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| 123 | else
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| 124 | am_cv_$1_dependencies_compiler_type=none
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| 125 | fi
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| 126 | ])
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| 127 | AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type])
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| 128 | AM_CONDITIONAL([am__fastdep$1], [
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| 129 | test "x$enable_dependency_tracking" != xno \
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| 130 | && test "$am_cv_$1_dependencies_compiler_type" = gcc3])
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| 131 | ])
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| 132 |
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| 133 |
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| 134 | # AM_SET_DEPDIR
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| 135 | # -------------
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| 136 | # Choose a directory name for dependency files.
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| 137 | # This macro is AC_REQUIREd in _AM_DEPENDENCIES
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| 138 | AC_DEFUN([AM_SET_DEPDIR],
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| 139 | [AC_REQUIRE([AM_SET_LEADING_DOT])dnl
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| 140 | AC_SUBST([DEPDIR], ["${am__leading_dot}deps"])dnl
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| 141 | ])
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| 142 |
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| 143 |
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| 144 | # AM_DEP_TRACK
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| 145 | # ------------
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| 146 | AC_DEFUN([AM_DEP_TRACK],
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| 147 | [AC_ARG_ENABLE(dependency-tracking,
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| 148 | [ --disable-dependency-tracking speeds up one-time build
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| 149 | --enable-dependency-tracking do not reject slow dependency extractors])
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| 150 | if test "x$enable_dependency_tracking" != xno; then
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| 151 | am_depcomp="$ac_aux_dir/depcomp"
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| 152 | AMDEPBACKSLASH='\'
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| 153 | fi
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| 154 | AM_CONDITIONAL([AMDEP], [test "x$enable_dependency_tracking" != xno])
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| 155 | AC_SUBST([AMDEPBACKSLASH])
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| 156 | ])
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