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## -*- Autoconf -*-
# Copyright (C) 1999-2018 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# 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", "OBJC", "OBJCXX", "UPC", or "GJC".
# We try a few techniques and use that to set a single cache variable.
#
# We don't AC_REQUIRE the corresponding AC_PROG_CC since the latter was
# modified to invoke _AM_DEPENDENCIES(CC); we would have a circular
# dependency, and given that the user is not expected to run this macro,
# just rely on AC_PROG_CC.
AC_DEFUN([_AM_DEPENDENCIES],
[AC_REQUIRE([AM_SET_DEPDIR])dnl
AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])dnl
AC_REQUIRE([AM_MAKE_INCLUDE])dnl
AC_REQUIRE([AM_DEP_TRACK])dnl
m4_if([$1], [CC], [depcc="$CC" am_compiler_list=],
[$1], [CXX], [depcc="$CXX" am_compiler_list=],
[$1], [OBJC], [depcc="$OBJC" am_compiler_list='gcc3 gcc'],
[$1], [OBJCXX], [depcc="$OBJCXX" am_compiler_list='gcc3 gcc'],
[$1], [UPC], [depcc="$UPC" am_compiler_list=],
[$1], [GCJ], [depcc="$GCJ" am_compiler_list='gcc3 gcc'],
[depcc="$$1" am_compiler_list=])
AC_CACHE_CHECK([dependency style of $depcc],
[am_cv_$1_dependencies_compiler_type],
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# We make a subdir and do the tests there. Otherwise we can end up
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# side effect of compilation, but ICC will put the dependencies in
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# directory.
mkdir sub
am_cv_$1_dependencies_compiler_type=none
if test "$am_compiler_list" = ""; then
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for depmode in $am_compiler_list; do
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#
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# overwrite some of them when testing with obscure command lines.
# This happens at least with the AIX C compiler.
: > sub/conftest.c
for i in 1 2 3 4 5 6; do
echo '#include "conftst'$i'.h"' >> sub/conftest.c
# Using ": > sub/conftst$i.h" creates only sub/conftst1.h with
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gcc)
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;;
nosideeffect)
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msvc7 | msvc7msys | msvisualcpp | msvcmsys)
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;;
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if depmode=$depmode \
source=sub/conftest.c object=$am__obj \
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$SHELL ./depcomp $depcc -c $am__minus_obj sub/conftest.c \
>/dev/null 2>conftest.err &&
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${MAKE-make} -s -f confmf > /dev/null 2>&1; then
# icc doesn't choke on unknown options, it will just issue warnings
# or remarks (even with -Werror). So we grep stderr for any message
# that says an option was ignored or not supported.
# When given -MP, icc 7.0 and 7.1 complain thusly:
# icc: Command line warning: ignoring option '-M'; no argument required
# The diagnosis changed in icc 8.0:
# icc: Command line remark: option '-MP' not supported
if (grep 'ignoring option' conftest.err ||
grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
am_cv_$1_dependencies_compiler_type=$depmode
break
fi
fi
done
cd ..
rm -rf conftest.dir
else
am_cv_$1_dependencies_compiler_type=none
fi
])
AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type])
AM_CONDITIONAL([am__fastdep$1], [
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# AM_SET_DEPDIR
# -------------
# Choose a directory name for dependency files.
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AC_SUBST([DEPDIR], ["${am__leading_dot}deps"])dnl
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# AM_DEP_TRACK
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])