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# serial 3
# There are a few dirty hacks below to avoid letting `AC_PROG_CC' be
# written in clear, in which case automake, when reading aclocal.m4,
# will think it sees a *use*, and therefore will trigger all it's
# C support machinery. Also note that it means that autoscan, seeing
# CC etc. in the Makefile, will ask for an AC_PROG_CC use...
# AM_DEPENDENCIES(NAME)
# ---------------------
# See how the compiler implements dependency checking.
# NAME is "CC", "CXX" or "OBJC".
# We try a few techniques and use that to set a single cache variable.
AC_DEFUN([AM_DEPENDENCIES],
[AC_REQUIRE([AM_SET_DEPDIR])dnl
AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])dnl
ifelse([$1], CC,
[AC_REQUIRE([AC_PROG_][CC])dnl
AC_REQUIRE([AC_PROG_][CPP])
depcc="$CC"
depcpp="$CPP"],
[$1], CXX, [AC_REQUIRE([AC_PROG_][CXX])dnl
AC_REQUIRE([AC_PROG_][CXXCPP])
depcc="$CXX"
depcpp="$CXXCPP"],
[$1], OBJC, [am_cv_OBJC_dependencies_compiler_type=gcc],
[AC_REQUIRE([AC_PROG_][$1])dnl
depcc="$$1"
depcpp=""])
AC_REQUIRE([AM_MAKE_INCLUDE])
AC_CACHE_CHECK([dependency style of $depcc],
[am_cv_$1_dependencies_compiler_type],
[if test -z "$AMDEP"; then
# We make a subdir and do the tests there. Otherwise we can end up
# making bogus files that we don't know about and never remove. For
# instance it was reported that on HP-UX the gcc test will end up
# making a dummy file named `D' -- because `-MD' means `put the output
# in D'.
mkdir confdir
# Copy depcomp to subdir because otherwise we won't find it if we're
# using a relative directory.
cp "$am_depcomp" confdir
cd confdir
am_cv_$1_dependencies_compiler_type=none
for depmode in `sed -n ['s/^#*\([a-zA-Z0-9]*\))$/\1/p'] < "./depcomp"`; do
# We need to recreate these files for each test, as the compiler may
# overwrite some of them when testing with obscure command lines.
# This happens at least with the AIX C compiler.
echo '#include "conftest.h"' > conftest.c
echo 'int i;' > conftest.h
case "$depmode" in
nosideeffect)
# after this tag, mechanisms are not by side-effect, so they'll
# only be used when explicitly requested
if test "x$enable_dependency_tracking" = xyes; then
continue
else
break
fi
;;
none) break ;;
esac
# We check with `-c' and `-o' for the sake of the "dashmstdout"
# mode. It turns out that the SunPro C++ compiler does not properly
# handle `-M -o', and we need to detect this.
if depmode="$depmode" \
source=conftest.c object=conftest.o \
depfile=conftest.Po tmpdepfile=conftest.TPo \
$SHELL ./depcomp $depcc -c conftest.c -o conftest.o >/dev/null 2>&1 &&
grep conftest.h conftest.Po > /dev/null 2>&1; then
am_cv_$1_dependencies_compiler_type="$depmode"
break
fi
done
cd ..
rm -rf confdir
else
am_cv_$1_dependencies_compiler_type=none
fi
])
$1DEPMODE="depmode=$am_cv_$1_dependencies_compiler_type"
AC_SUBST([$1DEPMODE])
])
# AM_SET_DEPDIR
# -------------
# Choose a directory name for dependency files.
# This macro is AC_REQUIREd in AM_DEPENDENCIES
AC_DEFUN([AM_SET_DEPDIR],
[if test -d .deps || mkdir .deps 2> /dev/null || test -d .deps; then
DEPDIR=.deps
# We redirect because .deps might already exist and be populated.
# In this situation we don't want to see an error.
rmdir .deps > /dev/null 2>&1
else
DEPDIR=_deps
fi
AC_SUBST(DEPDIR)
])
# AM_DEP_TRACK
# ------------
AC_DEFUN([AM_DEP_TRACK],
[AC_ARG_ENABLE(dependency-tracking,
[ --disable-dependency-tracking Speeds up one-time builds
--enable-dependency-tracking Do not reject slow dependency extractors])
if test "x$enable_dependency_tracking" != xno; then
am_depcomp="$ac_aux_dir/depcomp"
AMDEPBACKSLASH='\'
fi
AM_CONDITIONAL([AMDEP], [test "x$enable_dependency_tracking" != xno])
pushdef([subst], defn([AC_SUBST]))
subst(AMDEPBACKSLASH)
popdef([subst])
])
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