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1 # build-to-host.m4 serial 3
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2 dnl Copyright (C) 2023-2024 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl Written by Bruno Haible.
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8
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9 dnl When the build environment ($build_os) is different from the target runtime
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10 dnl environment ($host_os), file names may need to be converted from the build
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11 dnl environment syntax to the target runtime environment syntax. This is
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12 dnl because the Makefiles are executed (mostly) by build environment tools and
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13 dnl therefore expect file names in build environment syntax, whereas the runtime
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14 dnl expects file names in target runtime environment syntax.
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15 dnl
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16 dnl For example, if $build_os = cygwin and $host_os = mingw32, filenames need
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17 dnl be converted from Cygwin syntax to native Windows syntax:
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18 dnl /cygdrive/c/foo/bar -> C:\foo\bar
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19 dnl /usr/local/share -> C:\cygwin64\usr\local\share
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20 dnl
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21 dnl gl_BUILD_TO_HOST([somedir])
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22 dnl This macro takes as input an AC_SUBSTed variable 'somedir', which must
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23 dnl already have its final value assigned, and produces two additional
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24 dnl AC_SUBSTed variables 'somedir_c' and 'somedir_c_make', that designate the
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25 dnl same file name value, just in different syntax:
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26 dnl - somedir_c is the file name in target runtime environment syntax,
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27 dnl as a C string (starting and ending with a double-quote,
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28 dnl and with escaped backslashes and double-quotes in
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29 dnl between).
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30 dnl - somedir_c_make is the same thing, escaped for use in a Makefile.
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31
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32 AC_DEFUN([gl_BUILD_TO_HOST],
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33 [
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34 AC_REQUIRE([AC_CANONICAL_BUILD])
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35 AC_REQUIRE([AC_CANONICAL_HOST])
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36 AC_REQUIRE([gl_BUILD_TO_HOST_INIT])
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37
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38 dnl Define somedir_c.
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39 gl_final_[$1]="$[$1]"
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40 dnl Translate it from build syntax to host syntax.
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41 case "$build_os" in
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42 cygwin*)
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43 case "$host_os" in
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44 mingw* | windows*)
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45 gl_final_[$1]=`cygpath -w "$gl_final_[$1]"` ;;
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46 esac
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47 ;;
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48 esac
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49 dnl Convert it to C string syntax.
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50 [$1]_c=`printf '%s\n' "$gl_final_[$1]" | sed -e "$gl_sed_double_backslashes" -e "$gl_sed_escape_doublequotes" | tr -d "$gl_tr_cr"`
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51 [$1]_c='"'"$[$1]_c"'"'
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52 AC_SUBST([$1_c])
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53
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54 dnl Define somedir_c_make.
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55 [$1]_c_make=`printf '%s\n' "$[$1]_c" | sed -e "$gl_sed_escape_for_make_1" -e "$gl_sed_escape_for_make_2" | tr -d "$gl_tr_cr"`
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56 dnl Use the substituted somedir variable, when possible, so that the user
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57 dnl may adjust somedir a posteriori when there are no special characters.
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58 if test "$[$1]_c_make" = '\"'"${gl_final_[$1]}"'\"'; then
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59 [$1]_c_make='\"$([$1])\"'
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60 fi
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61 AC_SUBST([$1_c_make])
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62 ])
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63
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64 dnl Some initializations for gl_BUILD_TO_HOST.
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65 AC_DEFUN([gl_BUILD_TO_HOST_INIT],
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66 [
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67 gl_sed_double_backslashes='s/\\/\\\\/g'
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68 gl_sed_escape_doublequotes='s/"/\\"/g'
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69 changequote(,)dnl
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70 gl_sed_escape_for_make_1="s,\\([ \"&'();<>\\\\\`|]\\),\\\\\\1,g"
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71 changequote([,])dnl
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72 gl_sed_escape_for_make_2='s,\$,\\$$,g'
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73 dnl Find out how to remove carriage returns from output. Solaris /usr/ucb/tr
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74 dnl does not understand '\r'.
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75 case `echo r | tr -d '\r'` in
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76 '') gl_tr_cr='\015' ;;
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77 *) gl_tr_cr='\r' ;;
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78 esac
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79 ])
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