190 lines
7.1 KiB
Plaintext
190 lines
7.1 KiB
Plaintext
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## -*- Autoconf -*-
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# Copyright (C) 1999-2013 Free Software Foundation, Inc.
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#
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# There are a few dirty hacks below to avoid letting 'AC_PROG_CC' be
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# written in clear, in which case automake, when reading aclocal.m4,
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# will think it sees a *use*, and therefore will trigger all it's
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# C support machinery. Also note that it means that autoscan, seeing
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# CC etc. in the Makefile, will ask for an AC_PROG_CC use...
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# _AM_DEPENDENCIES(NAME)
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# ----------------------
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# See how the compiler implements dependency checking.
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# NAME is "CC", "CXX", "OBJC", "OBJCXX", "UPC", or "GJC".
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# We try a few techniques and use that to set a single cache variable.
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#
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# We don't AC_REQUIRE the corresponding AC_PROG_CC since the latter was
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# modified to invoke _AM_DEPENDENCIES(CC); we would have a circular
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# dependency, and given that the user is not expected to run this macro,
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# just rely on AC_PROG_CC.
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AC_DEFUN([_AM_DEPENDENCIES],
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[AC_REQUIRE([AM_SET_DEPDIR])dnl
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AC_REQUIRE([AM_OUTPUT_DEPENDENCY_COMMANDS])dnl
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AC_REQUIRE([AM_MAKE_INCLUDE])dnl
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AC_REQUIRE([AM_DEP_TRACK])dnl
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m4_if([$1], [CC], [depcc="$CC" am_compiler_list=],
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[$1], [CXX], [depcc="$CXX" am_compiler_list=],
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[$1], [OBJC], [depcc="$OBJC" am_compiler_list='gcc3 gcc'],
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[$1], [OBJCXX], [depcc="$OBJCXX" am_compiler_list='gcc3 gcc'],
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[$1], [UPC], [depcc="$UPC" am_compiler_list=],
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[$1], [GCJ], [depcc="$GCJ" am_compiler_list='gcc3 gcc'],
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[depcc="$$1" am_compiler_list=])
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AC_CACHE_CHECK([dependency style of $depcc],
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[am_cv_$1_dependencies_compiler_type],
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[if test -z "$AMDEP_TRUE" && test -f "$am_depcomp"; then
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# We make a subdir and do the tests there. Otherwise we can end up
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# making bogus files that we don't know about and never remove. For
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# instance it was reported that on HP-UX the gcc test will end up
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# making a dummy file named 'D' -- because '-MD' means "put the output
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# in D".
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rm -rf conftest.dir
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mkdir conftest.dir
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# Copy depcomp to subdir because otherwise we won't find it if we're
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# using a relative directory.
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cp "$am_depcomp" conftest.dir
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cd conftest.dir
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# We will build objects and dependencies in a subdirectory because
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# it helps to detect inapplicable dependency modes. For instance
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# both Tru64's cc and ICC support -MD to output dependencies as a
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# side effect of compilation, but ICC will put the dependencies in
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# the current directory while Tru64 will put them in the object
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# directory.
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mkdir sub
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am_cv_$1_dependencies_compiler_type=none
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if test "$am_compiler_list" = ""; then
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am_compiler_list=`sed -n ['s/^#*\([a-zA-Z0-9]*\))$/\1/p'] < ./depcomp`
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fi
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am__universal=false
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m4_case([$1], [CC],
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[case " $depcc " in #(
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*\ -arch\ *\ -arch\ *) am__universal=true ;;
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esac],
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[CXX],
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[case " $depcc " in #(
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*\ -arch\ *\ -arch\ *) am__universal=true ;;
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esac])
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for depmode in $am_compiler_list; do
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# Setup a source with many dependencies, because some compilers
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# like to wrap large dependency lists on column 80 (with \), and
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# we should not choose a depcomp mode which is confused by this.
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#
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# We need to recreate these files for each test, as the compiler may
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# overwrite some of them when testing with obscure command lines.
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# This happens at least with the AIX C compiler.
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: > sub/conftest.c
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for i in 1 2 3 4 5 6; do
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echo '#include "conftst'$i'.h"' >> sub/conftest.c
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# Using ": > sub/conftst$i.h" creates only sub/conftst1.h with
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# Solaris 10 /bin/sh.
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echo '/* dummy */' > sub/conftst$i.h
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done
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echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf
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# We check with '-c' and '-o' for the sake of the "dashmstdout"
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# mode. It turns out that the SunPro C++ compiler does not properly
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# handle '-M -o', and we need to detect this. Also, some Intel
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# versions had trouble with output in subdirs.
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am__obj=sub/conftest.${OBJEXT-o}
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am__minus_obj="-o $am__obj"
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case $depmode in
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gcc)
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# This depmode causes a compiler race in universal mode.
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test "$am__universal" = false || continue
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;;
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nosideeffect)
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# After this tag, mechanisms are not by side-effect, so they'll
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# only be used when explicitly requested.
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if test "x$enable_dependency_tracking" = xyes; then
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continue
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else
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break
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fi
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;;
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msvc7 | msvc7msys | msvisualcpp | msvcmsys)
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# This compiler won't grok '-c -o', but also, the minuso test has
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# not run yet. These depmodes are late enough in the game, and
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# so weak that their functioning should not be impacted.
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am__obj=conftest.${OBJEXT-o}
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am__minus_obj=
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;;
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none) break ;;
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esac
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if depmode=$depmode \
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source=sub/conftest.c object=$am__obj \
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depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
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$SHELL ./depcomp $depcc -c $am__minus_obj sub/conftest.c \
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>/dev/null 2>conftest.err &&
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grep sub/conftst1.h sub/conftest.Po > /dev/null 2>&1 &&
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grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
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grep $am__obj sub/conftest.Po > /dev/null 2>&1 &&
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${MAKE-make} -s -f confmf > /dev/null 2>&1; then
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# icc doesn't choke on unknown options, it will just issue warnings
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# or remarks (even with -Werror). So we grep stderr for any message
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# that says an option was ignored or not supported.
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# When given -MP, icc 7.0 and 7.1 complain thusly:
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# icc: Command line warning: ignoring option '-M'; no argument required
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# The diagnosis changed in icc 8.0:
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# icc: Command line remark: option '-MP' not supported
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if (grep 'ignoring option' conftest.err ||
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grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
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am_cv_$1_dependencies_compiler_type=$depmode
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break
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fi
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fi
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done
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cd ..
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rm -rf conftest.dir
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else
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am_cv_$1_dependencies_compiler_type=none
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fi
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])
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AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type])
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AM_CONDITIONAL([am__fastdep$1], [
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test "x$enable_dependency_tracking" != xno \
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&& test "$am_cv_$1_dependencies_compiler_type" = gcc3])
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])
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# AM_SET_DEPDIR
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# -------------
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# Choose a directory name for dependency files.
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# This macro is AC_REQUIREd in _AM_DEPENDENCIES.
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AC_DEFUN([AM_SET_DEPDIR],
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[AC_REQUIRE([AM_SET_LEADING_DOT])dnl
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AC_SUBST([DEPDIR], ["${am__leading_dot}deps"])dnl
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])
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# AM_DEP_TRACK
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# ------------
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AC_DEFUN([AM_DEP_TRACK],
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[AC_ARG_ENABLE([dependency-tracking], [dnl
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AS_HELP_STRING(
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[--enable-dependency-tracking],
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[do not reject slow dependency extractors])
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AS_HELP_STRING(
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[--disable-dependency-tracking],
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[speeds up one-time build])])
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if test "x$enable_dependency_tracking" != xno; then
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am_depcomp="$ac_aux_dir/depcomp"
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AMDEPBACKSLASH='\'
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am__nodep='_no'
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fi
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AM_CONDITIONAL([AMDEP], [test "x$enable_dependency_tracking" != xno])
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AC_SUBST([AMDEPBACKSLASH])dnl
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_AM_SUBST_NOTMAKE([AMDEPBACKSLASH])dnl
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AC_SUBST([am__nodep])dnl
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_AM_SUBST_NOTMAKE([am__nodep])dnl
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])
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