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+# build-to-host.m4 serial 3
+dnl Copyright (C) 2023-2024 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Written by Bruno Haible.
+
+dnl When the build environment ($build_os) is different from the target runtime
+dnl environment ($host_os), file names may need to be converted from the build
+dnl environment syntax to the target runtime environment syntax. This is
+dnl because the Makefiles are executed (mostly) by build environment tools and
+dnl therefore expect file names in build environment syntax, whereas the runtime
+dnl expects file names in target runtime environment syntax.
+dnl
+dnl For example, if $build_os = cygwin and $host_os = mingw32, filenames need
+dnl be converted from Cygwin syntax to native Windows syntax:
+dnl /cygdrive/c/foo/bar -> C:\foo\bar
+dnl /usr/local/share -> C:\cygwin64\usr\local\share
+dnl
+dnl gl_BUILD_TO_HOST([somedir])
+dnl This macro takes as input an AC_SUBSTed variable 'somedir', which must
+dnl already have its final value assigned, and produces two additional
+dnl AC_SUBSTed variables 'somedir_c' and 'somedir_c_make', that designate the
+dnl same file name value, just in different syntax:
+dnl - somedir_c is the file name in target runtime environment syntax,
+dnl as a C string (starting and ending with a double-quote,
+dnl and with escaped backslashes and double-quotes in
+dnl between).
+dnl - somedir_c_make is the same thing, escaped for use in a Makefile.
+
+AC_DEFUN([gl_BUILD_TO_HOST],
+[
+ AC_REQUIRE([AC_CANONICAL_BUILD])
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([gl_BUILD_TO_HOST_INIT])
+
+ dnl Define somedir_c.
+ gl_final_[$1]="$[$1]"
+ dnl Translate it from build syntax to host syntax.
+ case "$build_os" in
+ cygwin*)
+ case "$host_os" in
+ mingw* | windows*)
+ gl_final_[$1]=`cygpath -w "$gl_final_[$1]"` ;;
+ esac
+ ;;
+ esac
+ dnl Convert it to C string syntax.
+ [$1]_c=`printf '%s\n' "$gl_final_[$1]" | sed -e "$gl_sed_double_backslashes" -e "$gl_sed_escape_doublequotes" | tr -d "$gl_tr_cr"`
+ [$1]_c='"'"$[$1]_c"'"'
+ AC_SUBST([$1_c])
+
+ dnl Define somedir_c_make.
+ [$1]_c_make=`printf '%s\n' "$[$1]_c" | sed -e "$gl_sed_escape_for_make_1" -e "$gl_sed_escape_for_make_2" | tr -d "$gl_tr_cr"`
+ dnl Use the substituted somedir variable, when possible, so that the user
+ dnl may adjust somedir a posteriori when there are no special characters.
+ if test "$[$1]_c_make" = '\"'"${gl_final_[$1]}"'\"'; then
+ [$1]_c_make='\"$([$1])\"'
+ fi
+ AC_SUBST([$1_c_make])
+])
+
+dnl Some initializations for gl_BUILD_TO_HOST.
+AC_DEFUN([gl_BUILD_TO_HOST_INIT],
+[
+ gl_sed_double_backslashes='s/\\/\\\\/g'
+ gl_sed_escape_doublequotes='s/"/\\"/g'
+changequote(,)dnl
+ gl_sed_escape_for_make_1="s,\\([ \"&'();<>\\\\\`|]\\),\\\\\\1,g"
+changequote([,])dnl
+ gl_sed_escape_for_make_2='s,\$,\\$$,g'
+ dnl Find out how to remove carriage returns from output. Solaris /usr/ucb/tr
+ dnl does not understand '\r'.
+ case `echo r | tr -d '\r'` in
+ '') gl_tr_cr='\015' ;;
+ *) gl_tr_cr='\r' ;;
+ esac
+])