On Wed, 22 Apr 2020 23:05:38 +0100
Sergei Trofimovich <sly...@inbox.ru> wrote:

> From: Sergei Trofimovich <siarh...@google.com>
> 
> On system with 'ar' and '${CHOST}-ar' the latter is preferred.
> as it might not match default 'ar'.
> 
> Bug is initially reported downstream as https://bugs.gentoo.org/718004.
> 
> libcpp/ChangeLog:
> 
>       PR libcpp/94657
>       * Makefile.in: use @AR@ placeholder
>       * configure.ac: use AC_CHECK_TOOL to find 'ar'
>       * configure: regenerate
> ---
>  libcpp/ChangeLog    |  7 ++++
>  libcpp/Makefile.in  |  2 +-
>  libcpp/configure    | 94 +++++++++++++++++++++++++++++++++++++++++++++
>  libcpp/configure.ac |  1 +
>  4 files changed, 103 insertions(+), 1 deletion(-)
> 
> diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
> index 307cf3add94..77145768a3d 100644
> --- a/libcpp/ChangeLog
> +++ b/libcpp/ChangeLog
> @@ -1,3 +1,10 @@
> +2020-04-22  Sergei Trofimovich  <siarh...@google.com>
> +
> +     PR preprocessor/94657: use $AR, not 'ar'
> +     * Makefile.in: use @AR@ placeholder
> +     * configure.ac: use AC_CHECK_TOOL to find 'ar'
> +     * configure: regenerate
> +
>  2020-02-14  Jakub Jelinek  <ja...@redhat.com>
>  
>       Partially implement P1042R1: __VA_OPT__ wording clarifications
> diff --git a/libcpp/Makefile.in b/libcpp/Makefile.in
> index 8f8c8f65eb3..af7a0c6f73e 100644
> --- a/libcpp/Makefile.in
> +++ b/libcpp/Makefile.in
> @@ -25,7 +25,7 @@ srcdir = @srcdir@
>  top_builddir = .
>  VPATH = @srcdir@
>  INSTALL = @INSTALL@
> -AR = ar
> +AR = @AR@
>  ARFLAGS = cru
>  ACLOCAL = @ACLOCAL@
>  AUTOCONF = @AUTOCONF@
> diff --git a/libcpp/configure b/libcpp/configure
> index 11da199083b..a6dcf5dcb61 100755
> --- a/libcpp/configure
> +++ b/libcpp/configure
> @@ -657,6 +657,7 @@ ACLOCAL
>  EGREP
>  GREP
>  CPP
> +AR
>  RANLIB
>  ac_ct_CXX
>  CXXFLAGS
> @@ -1039,6 +1040,7 @@ do
>    | -silent | --silent | --silen | --sile | --sil)
>      silent=yes ;;
>  
> +
>    -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
>      ac_prev=sbindir ;;
>    -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
> @@ -4008,6 +4010,98 @@ else
>    RANLIB="$ac_cv_prog_RANLIB"
>  fi
>  
> +if test -n "$ac_tool_prefix"; then
> +  # Extract the first word of "${ac_tool_prefix}ar", so it can be a program 
> name with args.
> +set dummy ${ac_tool_prefix}ar; ac_word=$2
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
> +$as_echo_n "checking for $ac_word... " >&6; }
> +if ${ac_cv_prog_AR+:} false; then :
> +  $as_echo_n "(cached) " >&6
> +else
> +  if test -n "$AR"; then
> +  ac_cv_prog_AR="$AR" # Let the user override the test.
> +else
> +as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
> +for as_dir in $PATH
> +do
> +  IFS=$as_save_IFS
> +  test -z "$as_dir" && as_dir=.
> +    for ac_exec_ext in '' $ac_executable_extensions; do
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
> +    ac_cv_prog_AR="${ac_tool_prefix}ar"
> +    $as_echo "$as_me:${as_lineno-$LINENO}: found 
> $as_dir/$ac_word$ac_exec_ext" >&5
> +    break 2
> +  fi
> +done
> +  done
> +IFS=$as_save_IFS
> +
> +fi
> +fi
> +AR=$ac_cv_prog_AR
> +if test -n "$AR"; then
> +  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $AR" >&5
> +$as_echo "$AR" >&6; }
> +else
> +  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
> +$as_echo "no" >&6; }
> +fi
> +
> +
> +fi
> +if test -z "$ac_cv_prog_AR"; then
> +  ac_ct_AR=$AR
> +  # Extract the first word of "ar", so it can be a program name with args.
> +set dummy ar; ac_word=$2
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
> +$as_echo_n "checking for $ac_word... " >&6; }
> +if ${ac_cv_prog_ac_ct_AR+:} false; then :
> +  $as_echo_n "(cached) " >&6
> +else
> +  if test -n "$ac_ct_AR"; then
> +  ac_cv_prog_ac_ct_AR="$ac_ct_AR" # Let the user override the test.
> +else
> +as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
> +for as_dir in $PATH
> +do
> +  IFS=$as_save_IFS
> +  test -z "$as_dir" && as_dir=.
> +    for ac_exec_ext in '' $ac_executable_extensions; do
> +  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
> +    ac_cv_prog_ac_ct_AR="ar"
> +    $as_echo "$as_me:${as_lineno-$LINENO}: found 
> $as_dir/$ac_word$ac_exec_ext" >&5
> +    break 2
> +  fi
> +done
> +  done
> +IFS=$as_save_IFS
> +
> +fi
> +fi
> +ac_ct_AR=$ac_cv_prog_ac_ct_AR
> +if test -n "$ac_ct_AR"; then
> +  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_AR" >&5
> +$as_echo "$ac_ct_AR" >&6; }
> +else
> +  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
> +$as_echo "no" >&6; }
> +fi
> +
> +  if test "x$ac_ct_AR" = x; then
> +    AR=""
> +  else
> +    case $cross_compiling:$ac_tool_warned in
> +yes:)
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not 
> prefixed with host triplet" >&5
> +$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" 
> >&2;}
> +ac_tool_warned=yes ;;
> +esac
> +    AR=$ac_ct_AR
> +  fi
> +else
> +  AR="$ac_cv_prog_AR"
> +fi
> +
>  
>  
>  ac_ext=c
> diff --git a/libcpp/configure.ac b/libcpp/configure.ac
> index 1779562a3a7..9ccfb02aa13 100644
> --- a/libcpp/configure.ac
> +++ b/libcpp/configure.ac
> @@ -12,6 +12,7 @@ AC_PROG_INSTALL
>  AC_PROG_CC
>  AC_PROG_CXX
>  AC_PROG_RANLIB
> +AC_CHECK_TOOL(AR, ar)
>  
>  AC_USE_SYSTEM_EXTENSIONS
>  AC_SYS_LARGEFILE
> -- 
> 2.26.2
> 

Ping.

-- 

  Sergei

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