jpayne@68: # build-to-host.m4 serial 3
jpayne@68: dnl Copyright (C) 2023-2024 Free Software Foundation, Inc.
jpayne@68: dnl This file is free software; the Free Software Foundation
jpayne@68: dnl gives unlimited permission to copy and/or distribute it,
jpayne@68: dnl with or without modifications, as long as this notice is preserved.
jpayne@68: 
jpayne@68: dnl Written by Bruno Haible.
jpayne@68: 
jpayne@68: dnl When the build environment ($build_os) is different from the target runtime
jpayne@68: dnl environment ($host_os), file names may need to be converted from the build
jpayne@68: dnl environment syntax to the target runtime environment syntax. This is
jpayne@68: dnl because the Makefiles are executed (mostly) by build environment tools and
jpayne@68: dnl therefore expect file names in build environment syntax, whereas the runtime
jpayne@68: dnl expects file names in target runtime environment syntax.
jpayne@68: dnl
jpayne@68: dnl For example, if $build_os = cygwin and $host_os = mingw32, filenames need
jpayne@68: dnl be converted from Cygwin syntax to native Windows syntax:
jpayne@68: dnl   /cygdrive/c/foo/bar -> C:\foo\bar
jpayne@68: dnl   /usr/local/share    -> C:\cygwin64\usr\local\share
jpayne@68: dnl
jpayne@68: dnl gl_BUILD_TO_HOST([somedir])
jpayne@68: dnl This macro takes as input an AC_SUBSTed variable 'somedir', which must
jpayne@68: dnl already have its final value assigned, and produces two additional
jpayne@68: dnl AC_SUBSTed variables 'somedir_c' and 'somedir_c_make', that designate the
jpayne@68: dnl same file name value, just in different syntax:
jpayne@68: dnl   - somedir_c       is the file name in target runtime environment syntax,
jpayne@68: dnl                     as a C string (starting and ending with a double-quote,
jpayne@68: dnl                     and with escaped backslashes and double-quotes in
jpayne@68: dnl                     between).
jpayne@68: dnl   - somedir_c_make  is the same thing, escaped for use in a Makefile.
jpayne@68: 
jpayne@68: AC_DEFUN([gl_BUILD_TO_HOST],
jpayne@68: [
jpayne@68:   AC_REQUIRE([AC_CANONICAL_BUILD])
jpayne@68:   AC_REQUIRE([AC_CANONICAL_HOST])
jpayne@68:   AC_REQUIRE([gl_BUILD_TO_HOST_INIT])
jpayne@68: 
jpayne@68:   dnl Define somedir_c.
jpayne@68:   gl_final_[$1]="$[$1]"
jpayne@68:   dnl Translate it from build syntax to host syntax.
jpayne@68:   case "$build_os" in
jpayne@68:     cygwin*)
jpayne@68:       case "$host_os" in
jpayne@68:         mingw* | windows*)
jpayne@68:           gl_final_[$1]=`cygpath -w "$gl_final_[$1]"` ;;
jpayne@68:       esac
jpayne@68:       ;;
jpayne@68:   esac
jpayne@68:   dnl Convert it to C string syntax.
jpayne@68:   [$1]_c=`printf '%s\n' "$gl_final_[$1]" | sed -e "$gl_sed_double_backslashes" -e "$gl_sed_escape_doublequotes" | tr -d "$gl_tr_cr"`
jpayne@68:   [$1]_c='"'"$[$1]_c"'"'
jpayne@68:   AC_SUBST([$1_c])
jpayne@68: 
jpayne@68:   dnl Define somedir_c_make.
jpayne@68:   [$1]_c_make=`printf '%s\n' "$[$1]_c" | sed -e "$gl_sed_escape_for_make_1" -e "$gl_sed_escape_for_make_2" | tr -d "$gl_tr_cr"`
jpayne@68:   dnl Use the substituted somedir variable, when possible, so that the user
jpayne@68:   dnl may adjust somedir a posteriori when there are no special characters.
jpayne@68:   if test "$[$1]_c_make" = '\"'"${gl_final_[$1]}"'\"'; then
jpayne@68:     [$1]_c_make='\"$([$1])\"'
jpayne@68:   fi
jpayne@68:   AC_SUBST([$1_c_make])
jpayne@68: ])
jpayne@68: 
jpayne@68: dnl Some initializations for gl_BUILD_TO_HOST.
jpayne@68: AC_DEFUN([gl_BUILD_TO_HOST_INIT],
jpayne@68: [
jpayne@68:   gl_sed_double_backslashes='s/\\/\\\\/g'
jpayne@68:   gl_sed_escape_doublequotes='s/"/\\"/g'
jpayne@68: changequote(,)dnl
jpayne@68:   gl_sed_escape_for_make_1="s,\\([ \"&'();<>\\\\\`|]\\),\\\\\\1,g"
jpayne@68: changequote([,])dnl
jpayne@68:   gl_sed_escape_for_make_2='s,\$,\\$$,g'
jpayne@68:   dnl Find out how to remove carriage returns from output. Solaris /usr/ucb/tr
jpayne@68:   dnl does not understand '\r'.
jpayne@68:   case `echo r | tr -d '\r'` in
jpayne@68:     '') gl_tr_cr='\015' ;;
jpayne@68:     *)  gl_tr_cr='\r' ;;
jpayne@68:   esac
jpayne@68: ])