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 18
36
37AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD])
38AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl
39AC_REQUIRE([AC_PROG_CC])dnl
40AC_REQUIRE([AC_PROG_CPP])dnl
41AC_REQUIRE([AC_CANONICAL_BUILD])dnl
42
43dnl Use the standard macros, but make them use other variable names
44dnl
45pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl
46pushdef([ac_cv_prog_cc_c89], ac_cv_build_prog_cc_c89)dnl
47pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl
48pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl
49pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl
50pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl
51pushdef([ac_cv_c_compiler_gnu], ac_cv_build_c_compiler_gnu)dnl
52pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl
53pushdef([ac_cv_objext], ac_cv_build_objext)dnl
54pushdef([ac_exeext], ac_build_exeext)dnl
55pushdef([ac_objext], ac_build_objext)dnl
56pushdef([CC], CC_FOR_BUILD)dnl
57pushdef([CCDEPMODE], CCDEPMODE_FOR_BUILD)dnl
58pushdef([CPP], CPP_FOR_BUILD)dnl
59pushdef([GCC], GCC_FOR_BUILD)dnl
60pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
61pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
62pushdef([EXEEXT], BUILD_EXEEXT)dnl
63pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl
64pushdef([OBJEXT], BUILD_OBJEXT)dnl
65pushdef([host], build)dnl
66pushdef([host_alias], build_alias)dnl
67pushdef([host_cpu], build_cpu)dnl
68pushdef([host_vendor], build_vendor)dnl
69pushdef([host_os], build_os)dnl
70pushdef([ac_cv_host], ac_cv_build)dnl
71pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
72pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
73pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
74pushdef([ac_cv_host_os], ac_cv_build_os)dnl
75pushdef([ac_tool_prefix], ac_build_tool_prefix)dnl
76pushdef([am_cv_CC_dependencies_compiler_type], am_cv_build_CC_dependencies_compiler_type)dnl
77pushdef([am__fastdepCC_FALSE], am__fastdepCC_build_FALSE)dnl
78pushdef([am__fastdepCC_TRUE], am__fastdepCC_build_TRUE)dnl
79pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl
80pushdef([cross_compiling], cross_compiling_build)dnl
81
82cross_compiling_build=no
83
84ac_build_tool_prefix=
85AS_IF([test -n "$build"],      [ac_build_tool_prefix="$build-"],
86      [test -n "$build_alias"],[ac_build_tool_prefix="$build_alias-"])
87
88AC_LANG_PUSH([C])
89AC_PROG_CC
90_AC_COMPILER_EXEEXT
91_AC_COMPILER_OBJEXT
92AC_PROG_CPP
93
94dnl Restore the old definitions
95dnl
96popdef([cross_compiling])dnl
97popdef([am_cv_prog_cc_c_o])dnl
98popdef([am__fastdepCC_TRUE])dnl
99popdef([am__fastdepCC_FALSE])dnl
100popdef([am_cv_CC_dependencies_compiler_type])dnl
101popdef([ac_tool_prefix])dnl
102popdef([ac_cv_host_os])dnl
103popdef([ac_cv_host_vendor])dnl
104popdef([ac_cv_host_cpu])dnl
105popdef([ac_cv_host_alias])dnl
106popdef([ac_cv_host])dnl
107popdef([host_os])dnl
108popdef([host_vendor])dnl
109popdef([host_cpu])dnl
110popdef([host_alias])dnl
111popdef([host])dnl
112popdef([OBJEXT])dnl
113popdef([LDFLAGS])dnl
114popdef([EXEEXT])dnl
115popdef([CPPFLAGS])dnl
116popdef([CFLAGS])dnl
117popdef([GCC])dnl
118popdef([CPP])dnl
119popdef([CCDEPMODE])dnl
120popdef([CC])dnl
121popdef([ac_objext])dnl
122popdef([ac_exeext])dnl
123popdef([ac_cv_objext])dnl
124popdef([ac_cv_exeext])dnl
125popdef([ac_cv_c_compiler_gnu])dnl
126popdef([ac_cv_prog_cc_g])dnl
127popdef([ac_cv_prog_cc_cross])dnl
128popdef([ac_cv_prog_cc_works])dnl
129popdef([ac_cv_prog_cc_c89])dnl
130popdef([ac_cv_prog_gcc])dnl
131popdef([ac_cv_prog_CPP])dnl
132
133dnl restore global variables ac_ext, ac_cpp, ac_compile,
134dnl ac_link, ac_compiler_gnu (dependant on the current
135dnl language after popping):
136AC_LANG_POP([C])
137
138dnl Finally, set Makefile variables
139dnl
140AC_SUBST(BUILD_EXEEXT)dnl
141AC_SUBST(BUILD_OBJEXT)dnl
142AC_SUBST([CFLAGS_FOR_BUILD])dnl
143AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
144AC_SUBST([LDFLAGS_FOR_BUILD])dnl
145])
146