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1 # ===========================================================================
2 # https://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html
3 # ===========================================================================
4 #
5 # SYNOPSIS
6 #
7 # AX_PROG_CC_FOR_BUILD
8 #
9 # DESCRIPTION
10 #
11 # This macro searches for a C compiler that generates native executables,
12 # that is a C compiler that surely is not a cross-compiler. This can be
13 # useful if you have to generate source code at compile-time like for
14 # example GCC does.
15 #
16 # The macro sets the CC_FOR_BUILD and CPP_FOR_BUILD macros to anything
17 # needed to compile or link (CC_FOR_BUILD) and preprocess (CPP_FOR_BUILD).
18 # The value of these variables can be overridden by the user by specifying
19 # a compiler with an environment variable (like you do for standard CC).
20 #
21 # It also sets BUILD_EXEEXT and BUILD_OBJEXT to the executable and object
22 # file extensions for the build platform, and GCC_FOR_BUILD to `yes' if
23 # the compiler we found is GCC. All these variables but GCC_FOR_BUILD are
24 # substituted in the Makefile.
25 #
26 # LICENSE
27 #
28 # Copyright (c) 2008 Paolo Bonzini <bonzini@gnu.org>
29 #
30 # Copying and distribution of this file, with or without modification, are
31 # permitted in any medium without royalty provided the copyright notice
32 # and this notice are preserved. This file is offered as-is, without any
33 # warranty.
34
35 #serial 20
36
37 AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD])
38 AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl
39 AC_REQUIRE([AC_PROG_CC])dnl
40 AC_REQUIRE([AC_PROG_CPP])dnl
41 AC_REQUIRE([AC_CANONICAL_BUILD])dnl
42
43 dnl Use the standard macros, but make them use other variable names
44 dnl
45 pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl
46 pushdef([ac_cv_prog_cc_c89], ac_cv_build_prog_cc_c89)dnl
47 pushdef([ac_cv_prog_cc_c99], ac_cv_build_prog_cc_c99)dnl
48 pushdef([ac_cv_prog_cc_c11], ac_cv_build_prog_cc_c11)dnl
49 pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl
50 pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl
51 pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl
52 pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl
53 pushdef([ac_cv_c_compiler_gnu], ac_cv_build_c_compiler_gnu)dnl
54 pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl
55 pushdef([ac_cv_objext], ac_cv_build_objext)dnl
56 pushdef([ac_exeext], ac_build_exeext)dnl
57 pushdef([ac_objext], ac_build_objext)dnl
58 pushdef([CC], CC_FOR_BUILD)dnl
59 pushdef([CPP], CPP_FOR_BUILD)dnl
60 pushdef([GCC], GCC_FOR_BUILD)dnl
61 pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
62 pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
63 pushdef([EXEEXT], BUILD_EXEEXT)dnl
64 pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl
65 pushdef([OBJEXT], BUILD_OBJEXT)dnl
66 pushdef([host], build)dnl
67 pushdef([host_alias], build_alias)dnl
68 pushdef([host_cpu], build_cpu)dnl
69 pushdef([host_vendor], build_vendor)dnl
70 pushdef([host_os], build_os)dnl
71 pushdef([ac_cv_host], ac_cv_build)dnl
72 pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
73 pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
74 pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
75 pushdef([ac_cv_host_os], ac_cv_build_os)dnl
76 pushdef([ac_tool_prefix], ac_build_tool_prefix)dnl
77 pushdef([am_cv_CC_dependencies_compiler_type], am_cv_build_CC_dependencies_compiler_type)dnl
78 pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl
79 pushdef([cross_compiling], cross_compiling_build)dnl
80
81 cross_compiling_build=no
82
83 ac_build_tool_prefix=
84 AS_IF([test -n "$build"], [ac_build_tool_prefix="$build-"],
85 [test -n "$build_alias"],[ac_build_tool_prefix="$build_alias-"])
86
87 AC_LANG_PUSH([C])
88
89 dnl The pushdef([ac_cv_c_compiler_gnu], ...) currently does not cover
90 dnl the use of this variable in _AC_LANG_COMPILER_GNU called by
91 dnl AC_PROG_CC. Unset this cache variable temporarily as a workaround.
92 was_set_ac_cv_c_compiler_gnu=${[ac_cv_c_compiler_gnu]+y}
93 AS_IF([test ${was_set_ac_cv_c_compiler_gnu}],
94 [saved_ac_cv_c_compiler_gnu=$[ac_cv_c_compiler_gnu]
95 AS_UNSET([[ac_cv_c_compiler_gnu]])])
96
97 AC_PROG_CC
98
99 dnl Restore ac_cv_c_compiler_gnu
100 AS_IF([test ${was_set_ac_cv_c_compiler_gnu}],
101 [[ac_cv_c_compiler_gnu]=saved_ac_cv_c_compiler_gnu])
102
103 _AC_COMPILER_EXEEXT
104 _AC_COMPILER_OBJEXT
105 AC_PROG_CPP
106
107 dnl Restore the old definitions
108 dnl
109 popdef([cross_compiling])dnl
110 popdef([am_cv_prog_cc_c_o])dnl
111 popdef([am_cv_CC_dependencies_compiler_type])dnl
112 popdef([ac_tool_prefix])dnl
113 popdef([ac_cv_host_os])dnl
114 popdef([ac_cv_host_vendor])dnl
115 popdef([ac_cv_host_cpu])dnl
116 popdef([ac_cv_host_alias])dnl
117 popdef([ac_cv_host])dnl
118 popdef([host_os])dnl
119 popdef([host_vendor])dnl
120 popdef([host_cpu])dnl
121 popdef([host_alias])dnl
122 popdef([host])dnl
123 popdef([OBJEXT])dnl
124 popdef([LDFLAGS])dnl
125 popdef([EXEEXT])dnl
126 popdef([CPPFLAGS])dnl
127 popdef([CFLAGS])dnl
128 popdef([GCC])dnl
129 popdef([CPP])dnl
130 popdef([CC])dnl
131 popdef([ac_objext])dnl
132 popdef([ac_exeext])dnl
133 popdef([ac_cv_objext])dnl
134 popdef([ac_cv_exeext])dnl
135 popdef([ac_cv_c_compiler_gnu])dnl
136 popdef([ac_cv_prog_cc_g])dnl
137 popdef([ac_cv_prog_cc_cross])dnl
138 popdef([ac_cv_prog_cc_works])dnl
139 popdef([ac_cv_prog_cc_c89])dnl
140 popdef([ac_cv_prog_gcc])dnl
141 popdef([ac_cv_prog_CPP])dnl
142
143 dnl restore global variables ac_ext, ac_cpp, ac_compile,
144 dnl ac_link, ac_compiler_gnu (dependent on the current
145 dnl language after popping):
146 AC_LANG_POP([C])
147
148 dnl Finally, set Makefile variables
149 dnl
150 AC_SUBST(BUILD_EXEEXT)dnl
151 AC_SUBST(BUILD_OBJEXT)dnl
152 AC_SUBST([CFLAGS_FOR_BUILD])dnl
153 AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
154 AC_SUBST([LDFLAGS_FOR_BUILD])dnl
155 ])