1# Autoconf M4 include file defining utility macros for complex Canadian
2# cross builds.
3
4dnl ####
5dnl # _GCC_TOPLEV_NONCANONICAL_BUILD
6dnl # $build_alias or canonical $build if blank.
7dnl # Used when we would use $build_alias, but empty is not OK.
8AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_BUILD],
9[AC_REQUIRE([AC_CANONICAL_BUILD]) []dnl
10case ${build_alias} in
11  "") build_noncanonical=${build} ;;
12  *) build_noncanonical=${build_alias} ;;
13esac
14]) []dnl # _GCC_TOPLEV_NONCANONICAL_BUILD
15
16dnl ####
17dnl # _GCC_TOPLEV_NONCANONICAL_HOST
18dnl # $host_alias, or $build_noncanonical if blank.
19dnl # Used when we would use $host_alias, but empty is not OK.
20AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_HOST],
21[AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_BUILD]) []dnl
22case ${host_alias} in
23  "") host_noncanonical=${build_noncanonical} ;;
24  *) host_noncanonical=${host_alias} ;;
25esac
26]) []dnl # _GCC_TOPLEV_NONCANONICAL_HOST
27
28dnl ####
29dnl # _GCC_TOPLEV_NONCANONICAL_TARGET
30dnl # $target_alias or $host_noncanonical if blank.
31dnl # Used when we would use $target_alias, but empty is not OK.
32AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_TARGET],
33[AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_HOST]) []dnl
34case ${target_alias} in
35  "") target_noncanonical=${host_noncanonical} ;;
36  *) target_noncanonical=${target_alias} ;;
37esac
38]) []dnl # _GCC_TOPLEV_NONCANONICAL_TARGET
39
40dnl ####
41dnl # GCC_TOPLEV_SUBDIRS
42dnl # GCC & friends build 'build', 'host', and 'target' tools.  These must
43dnl # be separated into three well-known subdirectories of the build directory:
44dnl # build_subdir, host_subdir, and target_subdir.  The values are determined
45dnl # here so that they can (theoretically) be changed in the future.  They
46dnl # were previously reproduced across many different files.
47dnl #
48dnl # This logic really amounts to very little with autoconf 2.13; it will
49dnl # amount to a lot more with autoconf 2.5x.
50AC_DEFUN([GCC_TOPLEV_SUBDIRS],
51[AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_TARGET]) []dnl
52AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_BUILD]) []dnl
53# Prefix 'build-' so this never conflicts with target_subdir.
54build_subdir="build-${build_noncanonical}"
55# Not really a subdirectory, but here for completeness.
56host_subdir=.
57# No prefix.
58target_subdir=${target_noncanonical}
59AC_SUBST([build_subdir]) []dnl
60AC_SUBST([host_subdir]) []dnl
61AC_SUBST([target_subdir]) []dnl
62]) []dnl # GCC_TOPLEV_SUBDIRS
63
64
65####
66# _NCN_TOOL_PREFIXES:  Some stuff that oughtta be done in AC_CANONICAL_SYSTEM 
67# or AC_INIT.
68# These demand that AC_CANONICAL_SYSTEM be called beforehand.
69AC_DEFUN([_NCN_TOOL_PREFIXES],
70[ncn_tool_prefix=
71test -n "$host_alias" && ncn_tool_prefix=$host_alias-
72ncn_target_tool_prefix=
73test -n "$target_alias" && ncn_target_tool_prefix=$target_alias-
74]) []dnl # _NCN_TOOL_PREFIXES
75
76####
77# NCN_CHECK_TARGET_TOOL(variable, prog-to-check-for,[value-if-not-found],[path])
78# Like AC_CHECK_TOOL, but tries a prefix of the target, not the host.
79# Code is pretty much lifted from autoconf2.53.
80
81AC_DEFUN([NCN_CHECK_TARGET_TOOL],
82[AC_REQUIRE([_NCN_TOOL_PREFIXES]) []dnl
83if test -n "$ncn_target_tool_prefix"; then
84  AC_CHECK_PROG([$1], [${ncn_target_tool_prefix}$2], 
85                [${ncn_target_tool_prefix}$2], , [$4])
86fi
87if test -z "$ac_cv_prog_$1" ; then
88  ncn_cv_$1=$$1
89  AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [$3], [$4])
90  $1=$ncn_cv_$1
91else
92  $1="$ac_cv_prog_$1"
93fi
94]) []dnl # NCN_CHECK_TARGET_TOOL
95
96
97####
98# NCN_STRICT_CHECK_TOOL(variable, prog-to-check-for,[value-if-not-found],[path])
99# Like AC_CHECK_TOOL, but requires the prefix if build!=host.
100
101AC_DEFUN([NCN_STRICT_CHECK_TOOL],
102[AC_REQUIRE([_NCN_TOOL_PREFIXES]) []dnl
103if test -n "$ncn_tool_prefix"; then
104  AC_CHECK_PROG([$1], [${ncn_tool_prefix}$2], 
105                [${ncn_tool_prefix}$2], , [$4])
106fi
107if test -z "$ac_cv_prog_$1" ; then
108  if test $build = $host ; then
109    ncn_cv_$1=$$1
110    AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [ifelse([$3],[],[$2],[$3])], [$4]) 
111    $1=$ncn_cv_$1
112  else
113    $1="ifelse([$3],[],[${ncn_tool_prefix}$2],[$3])"
114  fi
115else
116  $1="$ac_cv_prog_$1"
117fi
118]) []dnl # NCN_STRICT_CHECK_TOOL
119
120
121####
122# NCN_STRICT_CHECK_TARGET_TOOL(variable, prog-to-check-for,[value-if-not-found],[path])
123# Like NCN_CHECK_TARGET_TOOL, but requires the prefix if build!=target.
124
125AC_DEFUN([NCN_STRICT_CHECK_TARGET_TOOL],
126[AC_REQUIRE([_NCN_TOOL_PREFIXES]) []dnl
127if test -n "$ncn_target_tool_prefix"; then
128  AC_CHECK_PROG([$1], [${ncn_target_tool_prefix}$2], 
129                [${ncn_target_tool_prefix}$2], , [$4])
130fi
131if test -z "$ac_cv_prog_$1" ; then
132  if test $build = $target ; then
133    ncn_cv_$1=$$1
134    AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [ifelse([$3],[],[$2],[$3])], [$4]) 
135    $1=$ncn_cv_$1
136  else
137    $1="ifelse([$3],[],[${ncn_target_tool_prefix}$2],[$3])"
138  fi
139else
140  $1="$ac_cv_prog_$1"
141fi
142]) []dnl # NCN_STRICT_CHECK_TARGET_TOOL
143
144###
145# AC_PROG_CPP_WERROR
146# Used for autoconf 2.5x to force AC_PREPROC_IFELSE to reject code which
147# triggers warnings from the preprocessor.  Will be in autoconf 2.58.
148# For now, using this also overrides header checks to use only the
149# preprocessor (matches 2.13 behavior; matching 2.58's behavior is a
150# bit harder from here).
151# Eventually autoconf will default to checking headers with the compiler
152# instead, and we'll have to do this differently.
153
154AC_DEFUN([AC_PROG_CPP_WERROR],
155[AC_REQUIRE([AC_PROG_CPP])dnl
156m4_define([AC_CHECK_HEADER],m4_defn([_AC_CHECK_HEADER_OLD]))
157ac_c_preproc_warn_flag=yes])# AC_PROG_CPP_WERROR
158