From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-patches-return-487529-listarch-gcc-patches=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 1438 invoked by alias); 15 Oct 2018 08:13:25 -0000
Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-patches.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-patches/>
List-Post: <mailto:gcc-patches@gcc.gnu.org>
List-Help: <mailto:gcc-patches-help@gcc.gnu.org>
Sender: gcc-patches-owner@gcc.gnu.org
Received: (qmail 79750 invoked by uid 89); 15 Oct 2018 08:12:32 -0000
Authentication-Results: sourceware.org; auth=none
X-Spam-SWARE-Status: No, score=-25.2 required=5.0 tests=AWL,BAYES_00,GIT_PATCH_0,GIT_PATCH_1,GIT_PATCH_2,GIT_PATCH_3,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.2 spammy=59, kai, config.host, arm-linux-gnueabi*
X-HELO: mail-vs1-f67.google.com
Received: from mail-vs1-f67.google.com (HELO mail-vs1-f67.google.com) (209.85.217.67) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Mon, 15 Oct 2018 08:12:24 +0000
Received: by mail-vs1-f67.google.com with SMTP id w85so15732262vsa.10        for <gcc-patches@gcc.gnu.org>; Mon, 15 Oct 2018 01:12:24 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;        d=linaro.org; s=google;        h=mime-version:references:in-reply-to:from:date:message-id:subject:to         :cc;        bh=XpKJMPtt2+aZ0Tn4Yhika3guEbu9Mw7hVMCosGxX32A=;        b=YPWGFEjjEAczDPN8ZeikO37xFCksGeAIdDUDHWaKFHxQXh897iFSYRoPPad1g+gJHQ         6ugJEJjNfnOzXFjIJRR5/K0JfzI4rCNm6bopbY6ey32tFnDtKWYdT50AJ43Tpp6HFz9A         tWoNlrW2qsjzwA9EAtnaw52b309xAkMHdZkQQ=
MIME-Version: 1.0
References: <20181011133518.17258-1-christophe.lyon@st.com> <20181011133518.17258-3-christophe.lyon@st.com> <e21de2b9-fe39-83e8-6814-e0f001ae629a@arm.com>
In-Reply-To: <e21de2b9-fe39-83e8-6814-e0f001ae629a@arm.com>
From: Christophe Lyon <christophe.lyon@linaro.org>
Date: Mon, 15 Oct 2018 08:46:00 -0000
Message-ID: <CAKdteOaqi6T6Qtj3ENRtKyYhAp7h7vOt0eZKmbaeBRVG=r-YsQ@mail.gmail.com>
Subject: Re: [ARM/FDPIC v3 02/21] [ARM] FDPIC: Handle arm*-*-uclinuxfdpiceabi in configure scripts
To: Richard Earnshaw <Richard.Earnshaw@arm.com>
Cc: christophe lyon St <christophe.lyon@st.com>, gcc Patches <gcc-patches@gcc.gnu.org>
Content-Type: text/plain; charset="UTF-8"
X-IsSubscribed: yes
X-SW-Source: 2018-10/txt/msg00833.txt.bz2

On Fri, 12 Oct 2018 at 11:54, Richard Earnshaw (lists) <
Richard.Earnshaw@arm.com> wrote:

> On 11/10/18 14:34, Christophe Lyon wrote:
> > The new arm-uclinuxfdpiceabi target behaves pretty much like
> > arm-linux-gnueabi. In order the enable the same set of features, we
> > have to update several configure scripts that generally match targets
> > like *-*-linux*: in most places, we add *-uclinux* where there is
> > already *-linux*, or uclinux* when there is already linux*.
> >
> > In gcc/config.gcc and libgcc/config.host we use *-*-uclinuxfdpiceabi
> > because there is already a different behaviour for *-*uclinux* target.
> >
> > In libtool.m4, we use uclinuxfdpiceabi in cases where ELF shared
> > libraries support is required, as uclinux does not guarantee that.
> >
> > 2018-XX-XX  Christophe Lyon  <christophe.lyon@st.com>
> >
> >       config/
> >       * futex.m4: Handle *-uclinux*.
> >       * tls.m4 (GCC_CHECK_TLS): Likewise.
> >
> >       gcc/
> >       * config.gcc: Handle *-*-uclinuxfdpiceabi.
> >
> >       libatomic/
> >       * configure.tgt: Handle arm*-*-uclinux*.
> >       * configure: Regenerate.
> >
> >       libgcc/
> >       * config.host: Handle *-*-uclinuxfdpiceabi.
> >
> >       libitm/
> >       * configure.tgt: Handle *-*-uclinux*.
> >       * configure: Regenerate.
> >
> >       libstdc++-v3/
> >       * acinclude.m4: Handle uclinux*.
> >       * configure: Regenerate.
> >       * configure.host: Handle uclinux*
> >
> >       * libtool.m4: Handle uclinux*.
>
> What testing have you done to ensure that these new uclinux* changes
> have not affected existing uclinux configurations?
>
> Also, do you really need to use uclinuxfdpiceabi (which is quite
> Arm-specific) everywhere, or would uclinuxfdpic* be better and ease work
> for other fdpic targets?
>
>
This patch became necessary when I was asked to change the target name
from  arm-linux-uclibceabi to arm-uclinuxfdpiceabi.
Changing it implied that many features were disabled and tests regressed
because the new target name didn't match the regexps in configure scripts.

I iterated over the regressions to see which features were now missing, and
I updated the configure scripts accordingly.

When the feature being tested was generic, I used the general *-*-uclinux*
form, because it seemed reasonable that it was OK for other targets.
When the test was arm-related, I used the stricter uclinuxfdpiceabi form,
and specifically not uclinuxfdpic* to avoid breaking other fdpic targets.
When in doubt, I preferred to stay on the safe side.

To answer you first question, I do not have the setup to test other uclinux
configs, I'm not even sure of the list.
So I tested arm-uclinuxfdpiceabi, made sure I got the same results as with
our previous target name, and that
the whole series didn't regress on arm-linux-gnueabi*.

I hope other uclinux/fdpic target maintainers comment on this patch if
something looks wrong to them.

Christophe

R.
> >
> > Change-Id: I6a1fdcd9847d8a82179a214612a3474c1f492916
> >
> > diff --git a/config/futex.m4 b/config/futex.m4
> > index e95144d..4dffe15 100644
> > --- a/config/futex.m4
> > +++ b/config/futex.m4
> > @@ -9,7 +9,7 @@ AC_DEFUN([GCC_LINUX_FUTEX],[dnl
> >  GCC_ENABLE(linux-futex,default, ,[use the Linux futex system call],
> >          permit yes|no|default)
> >  case "$target" in
> > -  *-linux*)
> > +  *-linux* | *-uclinux*)
> >      case "$enable_linux_futex" in
> >        default)
> >       # If headers don't have gettid/futex syscalls definition, then
> > diff --git a/config/tls.m4 b/config/tls.m4
> > index 4e170c8..5a8676e 100644
> > --- a/config/tls.m4
> > +++ b/config/tls.m4
> > @@ -76,7 +76,7 @@ AC_DEFUN([GCC_CHECK_TLS], [
> >         dnl Shared library options may depend on the host; this check
> >         dnl is only known to be needed for GNU/Linux.
> >         case $host in
> > -         *-*-linux*)
> > +         *-*-linux* | -*-uclinux*)
> >             LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS"
> >             ;;
> >         esac
> > diff --git a/gcc/config.gcc b/gcc/config.gcc
> > index 0c579d1..793fc69 100644
> > --- a/gcc/config.gcc
> > +++ b/gcc/config.gcc
> > @@ -753,7 +753,7 @@ case ${target} in
> >  *-*-fuchsia*)
> >    native_system_header_dir=/include
> >    ;;
> > -*-*-linux* | frv-*-*linux* | *-*-kfreebsd*-gnu | *-*-gnu* |
> *-*-kopensolaris*-gnu)
> > +*-*-linux* | frv-*-*linux* | *-*-kfreebsd*-gnu | *-*-gnu* |
> *-*-kopensolaris*-gnu | *-*-uclinuxfdpiceabi)
> >    extra_options="$extra_options gnu-user.opt"
> >    gas=yes
> >    gnu_ld=yes
> > @@ -762,7 +762,7 @@ case ${target} in
> >    esac
> >    tmake_file="t-slibgcc"
> >    case $target in
> > -    *-*-linux* | frv-*-*linux* | *-*-kfreebsd*-gnu |
> *-*-kopensolaris*-gnu)
> > +    *-*-linux* | frv-*-*linux* | *-*-kfreebsd*-gnu |
> *-*-kopensolaris*-gnu  | *-*-uclinuxfdpiceabi)
> >        :;;
> >      *-*-gnu*)
> >        native_system_header_dir=/include
> > @@ -782,7 +782,7 @@ case ${target} in
> >      *-*-*android*)
> >        tm_defines="$tm_defines DEFAULT_LIBC=LIBC_BIONIC"
> >        ;;
> > -    *-*-*uclibc*)
> > +    *-*-*uclibc* | *-*-uclinuxfdpiceabi)
> >        tm_defines="$tm_defines DEFAULT_LIBC=LIBC_UCLIBC"
> >        ;;
> >      *-*-*musl*)
> > @@ -1134,7 +1134,7 @@ arm*-*-netbsdelf*)
> >       tmake_file="${tmake_file} arm/t-arm"
> >       target_cpu_cname="arm6"
> >       ;;
> > -arm*-*-linux-*)                      # ARM GNU/Linux with ELF
> > +arm*-*-linux-* | arm*-*-uclinuxfdpiceabi)                    # ARM
> GNU/Linux with ELF
> >       tm_file="dbxelf.h elfos.h gnu-user.h linux.h linux-android.h
> glibc-stdint.h arm/elf.h arm/linux-gas.h arm/linux-elf.h"
> >       extra_options="${extra_options} linux-android.opt"
> >       case $target in
> > diff --git a/libatomic/configure b/libatomic/configure
> > index b902e2c..5b3ef8e 100755
> > --- a/libatomic/configure
> > +++ b/libatomic/configure
> > @@ -5819,7 +5819,7 @@ irix5* | irix6* | nonstopux*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    lt_cv_deplibs_check_method=pass_all
> >    ;;
> >
> > @@ -8305,7 +8305,7 @@ $as_echo_n "checking for $compiler option to
> produce PIC... " >&6; }
> >        lt_prog_compiler_static='-non_shared'
> >        ;;
> >
> > -    linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinux*)
> >        case $cc_basename in
> >        # old Intel for x86_64 which still supported -KPIC.
> >        ecc*)
> > @@ -8900,7 +8900,7 @@ _LT_EOF
> >        archive_expsym_cmds='sed "s,^,_," $export_symbols
> >$output_objdir/$soname.expsym~$CC -shared $pic_flag $libobjs $deplibs
> $compiler_flags ${wl}-h,$soname
> ${wl}--retain-symbols-file,$output_objdir/$soname.expsym
> ${wl}--image-base,`expr ${RANDOM-$$} % 4096 / 2 \* 262144 + 1342177280` -o
> $lib'
> >        ;;
> >
> > -    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu |
> uclinuxfdpiceabi)
> >        tmp_diet=no
> >        if test "$host_os" = linux-dietlibc; then
> >       case $cc_basename in
> > @@ -10431,7 +10431,7 @@ linux*oldld* | linux*aout* | linux*coff*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    version_type=linux
> >    need_lib_prefix=no
> >    need_version=no
> > diff --git a/libatomic/configure.tgt b/libatomic/configure.tgt
> > index ea8c34f..c1a608f 100644
> > --- a/libatomic/configure.tgt
> > +++ b/libatomic/configure.tgt
> > @@ -124,7 +124,7 @@ case "${target}" in
> >       config_path="${config_path} linux/aarch64 posix"
> >       ;;
> >
> > -  arm*-*-linux*)
> > +  arm*-*-linux* | arm*-*-uclinux*)
> >       # OS support for atomic primitives.
> >       config_path="${config_path} linux/arm posix"
> >       ;;
> > diff --git a/libgcc/config.host b/libgcc/config.host
> > index 029f656..28f3c14 100644
> > --- a/libgcc/config.host
> > +++ b/libgcc/config.host
> > @@ -238,7 +238,7 @@ case ${host} in
> >    tmake_file="$tmake_file t-crtstuff-pic t-libgcc-pic t-eh-dw2-dip
> t-slibgcc t-slibgcc-fuchsia"
> >    extra_parts="crtbegin.o crtend.o"
> >    ;;
> > -*-*-linux* | frv-*-*linux* | *-*-kfreebsd*-gnu | *-*-gnu* |
> *-*-kopensolaris*-gnu)
> > +*-*-linux* | frv-*-*linux* | *-*-kfreebsd*-gnu | *-*-gnu* |
> *-*-kopensolaris*-gnu | *-*-uclinuxfdpiceabi)
> >    tmake_file="$tmake_file t-crtstuff-pic t-libgcc-pic t-eh-dw2-dip
> t-slibgcc t-slibgcc-gld t-slibgcc-elf-ver t-linux"
> >    extra_parts="crtbegin.o crtbeginS.o crtbeginT.o crtend.o crtendS.o"
> >    if test x$enable_vtable_verify = xyes; then
> > @@ -424,7 +424,7 @@ arm*-*-fuchsia*)
> >  arm*-*-netbsdelf*)
> >       tmake_file="$tmake_file arm/t-arm arm/t-netbsd t-slibgcc-gld-nover"
> >       ;;
> > -arm*-*-linux*)                       # ARM GNU/Linux with ELF
> > +arm*-*-linux* | arm*-*-uclinuxfdpiceabi)                     # ARM
> GNU/Linux with ELF
> >       tmake_file="${tmake_file} arm/t-arm t-fixedpoint-gnu-prefix
> t-crtfm"
> >       tmake_file="${tmake_file} arm/t-elf arm/t-bpabi arm/t-linux-eabi
> t-slibgcc-libgcc"
> >       tm_file="$tm_file arm/bpabi-lib.h"
> > diff --git a/libitm/configure b/libitm/configure
> > index dbf386d..fd82500 100644
> > --- a/libitm/configure
> > +++ b/libitm/configure
> > @@ -6494,7 +6494,7 @@ irix5* | irix6* | nonstopux*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    lt_cv_deplibs_check_method=pass_all
> >    ;;
> >
> > @@ -8981,7 +8981,7 @@ $as_echo_n "checking for $compiler option to
> produce PIC... " >&6; }
> >        lt_prog_compiler_static='-non_shared'
> >        ;;
> >
> > -    linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinux*)
> >        case $cc_basename in
> >        # old Intel for x86_64 which still supported -KPIC.
> >        ecc*)
> > @@ -9576,7 +9576,7 @@ _LT_EOF
> >        archive_expsym_cmds='sed "s,^,_," $export_symbols
> >$output_objdir/$soname.expsym~$CC -shared $pic_flag $libobjs $deplibs
> $compiler_flags ${wl}-h,$soname
> ${wl}--retain-symbols-file,$output_objdir/$soname.expsym
> ${wl}--image-base,`expr ${RANDOM-$$} % 4096 / 2 \* 262144 + 1342177280` -o
> $lib'
> >        ;;
> >
> > -    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu |
> uclinuxfdpiceabi)
> >        tmp_diet=no
> >        if test "$host_os" = linux-dietlibc; then
> >       case $cc_basename in
> > @@ -11107,7 +11107,7 @@ linux*oldld* | linux*aout* | linux*coff*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    version_type=linux
> >    need_lib_prefix=no
> >    need_version=no
> > @@ -13008,7 +13008,7 @@ if test -z "$aix_libpath"; then
> aix_libpath="/usr/lib:/lib"; fi
> >          inherit_rpath_CXX=yes
> >          ;;
> >
> > -      linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +      linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >          case $cc_basename in
> >            KCC*)
> >           # Kuck and Associates, Inc. (KAI) C++ Compiler
> > @@ -13595,7 +13595,7 @@ interix[3-9]*)
> >    postdeps_CXX=
> >    ;;
> >
> > -linux*)
> > +linux* | uclinux*)
> >    case `$CC -V 2>&1 | sed 5q` in
> >    *Sun\ C*)
> >      # Sun C++ 5.9
> > @@ -13846,7 +13846,7 @@ $as_echo_n "checking for $compiler option to
> produce PIC... " >&6; }
> >           ;;
> >       esac
> >       ;;
> > -      linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +      linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinux*)
> >       case $cc_basename in
> >         KCC*)
> >           # KAI C++ Compiler
> > @@ -14767,7 +14767,7 @@ linux*oldld* | linux*aout* | linux*coff*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    version_type=linux
> >    need_lib_prefix=no
> >    need_version=no
> > @@ -16239,7 +16239,7 @@ fi
> >
> >
> >  case "$target" in
> > -  *-linux*)
> > +  *-linux* | *-uclinux*)
> >      case "$enable_linux_futex" in
> >        default)
> >       # If headers don't have gettid/futex syscalls definition, then
> > @@ -16362,7 +16362,7 @@ _ACEOF
> >  if ac_fn_c_try_link "$LINENO"; then :
> >    chktls_save_LDFLAGS="$LDFLAGS"
> >                         case $host in
> > -         *-*-linux*)
> > +         *-*-linux* | -*-uclinux*)
> >             LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS"
> >             ;;
> >         esac
> > diff --git a/libitm/configure.tgt b/libitm/configure.tgt
> > index 0cbb097..bc6c3ca 100644
> > --- a/libitm/configure.tgt
> > +++ b/libitm/configure.tgt
> > @@ -127,7 +127,7 @@ config_path="$ARCH posix generic"
> >
> >  # Other system configury
> >  case "${target}" in
> > -  *-*-linux*)
> > +  *-*-linux* | *-*-uclinux*)
> >       if test "$enable_linux_futex" = yes; then
> >         config_path="linux/$ARCH linux $config_path"
> >       fi
> > diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
> > index 6d68e90..2e18049 100644
> > --- a/libstdc++-v3/acinclude.m4
> > +++ b/libstdc++-v3/acinclude.m4
> > @@ -1395,7 +1395,7 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
> >          ac_has_nanosleep=yes
> >          ac_has_sched_yield=yes
> >          ;;
> > -      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >          AC_MSG_CHECKING([for at least GNU libc 2.17])
> >          AC_TRY_COMPILE(
> >            [#include <features.h>],
> > @@ -1517,7 +1517,7 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
> >
> >    if test x"$ac_has_clock_monotonic" != x"yes"; then
> >      case ${target_os} in
> > -      linux*)
> > +      linux* | uclinux*)
> >       AC_MSG_CHECKING([for clock_gettime syscall])
> >       AC_TRY_COMPILE(
> >         [#include <unistd.h>
> > @@ -2402,7 +2402,7 @@ AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
> >    # Default to "generic".
> >    if test $enable_clocale_flag = auto; then
> >      case ${target_os} in
> > -      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >       enable_clocale_flag=gnu
> >       ;;
> >        darwin*)
> > @@ -2648,7 +2648,7 @@ AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
> >    # Default to "new".
> >    if test $enable_libstdcxx_allocator_flag = auto; then
> >      case ${target_os} in
> > -      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >       enable_libstdcxx_allocator_flag=new
> >       ;;
> >        *)
> > @@ -4282,7 +4282,7 @@ AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
> >        freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
> >          enable_libstdcxx_filesystem_ts=yes
> >          ;;
> > -      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >          enable_libstdcxx_filesystem_ts=yes
> >          ;;
> >        rtems*)
> > @@ -4430,7 +4430,7 @@ dnl
> >      AC_MSG_CHECKING([for sendfile that can copy files])
> >      AC_CACHE_VAL(glibcxx_cv_sendfile, [dnl
> >        case "${target_os}" in
> > -        gnu* | linux* | solaris*)
> > +        gnu* | linux* | solaris* | uclinux*)
> >            GCC_TRY_COMPILE_OR_LINK(
> >              [#include <sys/sendfile.h>],
> >              [sendfile(1, 2, (off_t*)0, sizeof 1);],
> > diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
> > index d33081d..7780679 100755
> > --- a/libstdc++-v3/configure
> > +++ b/libstdc++-v3/configure
> > @@ -6413,7 +6413,7 @@ irix5* | irix6* | nonstopux*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    lt_cv_deplibs_check_method=pass_all
> >    ;;
> >
> > @@ -8765,7 +8765,7 @@ $as_echo_n "checking for $compiler option to
> produce PIC... " >&6; }
> >        lt_prog_compiler_static='-non_shared'
> >        ;;
> >
> > -    linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinux*)
> >        case $cc_basename in
> >        # old Intel for x86_64 which still supported -KPIC.
> >        ecc*)
> > @@ -9360,7 +9360,7 @@ _LT_EOF
> >        archive_expsym_cmds='sed "s,^,_," $export_symbols
> >$output_objdir/$soname.expsym~$CC -shared $pic_flag $libobjs $deplibs
> $compiler_flags ${wl}-h,$soname
> ${wl}--retain-symbols-file,$output_objdir/$soname.expsym
> ${wl}--image-base,`expr ${RANDOM-$$} % 4096 / 2 \* 262144 + 1342177280` -o
> $lib'
> >        ;;
> >
> > -    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu |
> uclinuxfdpiceabi)
> >        tmp_diet=no
> >        if test "$host_os" = linux-dietlibc; then
> >       case $cc_basename in
> > @@ -10900,7 +10900,7 @@ linux*oldld* | linux*aout* | linux*coff*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    version_type=linux
> >    need_lib_prefix=no
> >    need_version=no
> > @@ -12825,7 +12825,7 @@ if test -z "$aix_libpath"; then
> aix_libpath="/usr/lib:/lib"; fi
> >          inherit_rpath_CXX=yes
> >          ;;
> >
> > -      linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +      linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >          case $cc_basename in
> >            KCC*)
> >           # Kuck and Associates, Inc. (KAI) C++ Compiler
> > @@ -13412,7 +13412,7 @@ interix[3-9]*)
> >    postdeps_CXX=
> >    ;;
> >
> > -linux*)
> > +linux* | uclinux*)
> >    case `$CC -V 2>&1 | sed 5q` in
> >    *Sun\ C*)
> >      # Sun C++ 5.9
> > @@ -13663,7 +13663,7 @@ $as_echo_n "checking for $compiler option to
> produce PIC... " >&6; }
> >           ;;
> >       esac
> >       ;;
> > -      linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +      linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinux*)
> >       case $cc_basename in
> >         KCC*)
> >           # KAI C++ Compiler
> > @@ -14584,7 +14584,7 @@ linux*oldld* | linux*aout* | linux*coff*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    version_type=linux
> >    need_lib_prefix=no
> >    need_version=no
> > @@ -15833,7 +15833,7 @@ fi
> >    # Default to "generic".
> >    if test $enable_clocale_flag = auto; then
> >      case ${target_os} in
> > -      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >       enable_clocale_flag=gnu
> >       ;;
> >        darwin*)
> > @@ -16250,7 +16250,7 @@ fi
> >    # Default to "new".
> >    if test $enable_libstdcxx_allocator_flag = auto; then
> >      case ${target_os} in
> > -      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >       enable_libstdcxx_allocator_flag=new
> >       ;;
> >        *)
> > @@ -20526,7 +20526,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
> >          ac_has_nanosleep=yes
> >          ac_has_sched_yield=yes
> >          ;;
> > -      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >          { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at least
> GNU libc 2.17" >&5
> >  $as_echo_n "checking for at least GNU libc 2.17... " >&6; }
> >          cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> > @@ -21026,7 +21026,7 @@ $as_echo "$ac_has_nanosleep" >&6; }
> >
> >    if test x"$ac_has_clock_monotonic" != x"yes"; then
> >      case ${target_os} in
> > -      linux*)
> > +      linux* | uclinux*)
> >       { $as_echo "$as_me:${as_lineno-$LINENO}: checking for
> clock_gettime syscall" >&5
> >  $as_echo_n "checking for clock_gettime syscall... " >&6; }
> >       cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> > @@ -27918,7 +27918,7 @@ _ACEOF
> >  if ac_fn_c_try_link "$LINENO"; then :
> >    chktls_save_LDFLAGS="$LDFLAGS"
> >                         case $host in
> > -         *-*-linux*)
> > +         *-*-linux* | -*-uclinux*)
> >             LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS"
> >             ;;
> >         esac
> > @@ -53578,7 +53578,7 @@ _ACEOF
> >  if ac_fn_c_try_link "$LINENO"; then :
> >    chktls_save_LDFLAGS="$LDFLAGS"
> >                         case $host in
> > -         *-*-linux*)
> > +         *-*-linux* | -*-uclinux*)
> >             LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS"
> >             ;;
> >         esac
> > @@ -59771,7 +59771,7 @@ _ACEOF
> >  if ac_fn_c_try_link "$LINENO"; then :
> >    chktls_save_LDFLAGS="$LDFLAGS"
> >                         case $host in
> > -         *-*-linux*)
> > +         *-*-linux* | -*-uclinux*)
> >             LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS"
> >             ;;
> >         esac
> > @@ -78397,7 +78397,7 @@ fi
> >
> >
> >  case "$target" in
> > -  *-linux*)
> > +  *-linux* | *-uclinux*)
> >      case "$enable_linux_futex" in
> >        default)
> >       # If headers don't have gettid/futex syscalls definition, then
> > @@ -80033,7 +80033,7 @@ $as_echo_n "checking whether to build Filesystem
> TS support... " >&6; }
> >        freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
> >          enable_libstdcxx_filesystem_ts=yes
> >          ;;
> > -      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
> > +      gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
> >          enable_libstdcxx_filesystem_ts=yes
> >          ;;
> >        rtems*)
> > @@ -80457,7 +80457,7 @@ $as_echo_n "checking for sendfile that can copy
> files... " >&6; }
> >    $as_echo_n "(cached) " >&6
> >  else
> >          case "${target_os}" in
> > -        gnu* | linux* | solaris*)
> > +        gnu* | linux* | solaris* | uclinux*)
> >            if test x$gcc_no_link = xyes; then
> >    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> >  /* end confdefs.h.  */
> > diff --git a/libstdc++-v3/configure.host b/libstdc++-v3/configure.host
> > index 155a3cd..1c298ab 100644
> > --- a/libstdc++-v3/configure.host
> > +++ b/libstdc++-v3/configure.host
> > @@ -264,7 +264,7 @@ case "${host_os}" in
> >    linux-musl*)
> >      os_include_dir="os/generic"
> >      ;;
> > -  gnu* | linux* | kfreebsd*-gnu)
> > +  gnu* | linux* | kfreebsd*-gnu | uclinux*)
> >      if [ "$uclibc" = "yes" ]; then
> >        os_include_dir="os/uclibc"
> >      elif [ "$bionic" = "yes" ]; then
> > @@ -327,7 +327,7 @@ esac
> >  # Set any OS-dependent and CPU-dependent bits.
> >  # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
> >  case "${host}" in
> > -  *-*-linux*)
> > +  *-*-linux* | *-*-uclinux*)
> >      case "${host_cpu}" in
> >        i[567]86)
> >          abi_baseline_pair=i486-linux-gnu
> > @@ -358,7 +358,7 @@ case "${host}" in
> >          fi
> >      esac
> >      case "${host}" in
> > -      arm*-*-linux-*)
> > +      arm*-*-linux-* | arm*-*-uclinuxfdpiceabi)
> >
>  port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
> >       ;;
> >      esac
> > diff --git a/libtool.m4 b/libtool.m4
> > index 940faaa..49ab293 100644
> > --- a/libtool.m4
> > +++ b/libtool.m4
> > @@ -2449,7 +2449,7 @@ linux*oldld* | linux*aout* | linux*coff*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    version_type=linux
> >    need_lib_prefix=no
> >    need_version=no
> > @@ -3089,7 +3089,7 @@ irix5* | irix6* | nonstopux*)
> >    ;;
> >
> >  # This must be Linux ELF.
> > -linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >    lt_cv_deplibs_check_method=pass_all
> >    ;;
> >
> > @@ -3734,7 +3734,7 @@ m4_if([$1], [CXX], [
> >           ;;
> >       esac
> >       ;;
> > -      linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +      linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinux*)
> >       case $cc_basename in
> >         KCC*)
> >           # KAI C++ Compiler
> > @@ -4032,7 +4032,7 @@ m4_if([$1], [CXX], [
> >        _LT_TAGVAR(lt_prog_compiler_static, $1)='-non_shared'
> >        ;;
> >
> > -    linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinux*)
> >        case $cc_basename in
> >        # old Intel for x86_64 which still supported -KPIC.
> >        ecc*)
> > @@ -4449,7 +4449,7 @@ _LT_EOF
> >        _LT_TAGVAR(archive_expsym_cmds, $1)='sed "s,^,_," $export_symbols
> >$output_objdir/$soname.expsym~$CC -shared $pic_flag $libobjs $deplibs
> $compiler_flags ${wl}-h,$soname
> ${wl}--retain-symbols-file,$output_objdir/$soname.expsym
> ${wl}--image-base,`expr ${RANDOM-$$} % 4096 / 2 \* 262144 + 1342177280` -o
> $lib'
> >        ;;
> >
> > -    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu)
> > +    gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu |
> uclinuxfdpiceabi)
> >        tmp_diet=no
> >        if test "$host_os" = linux-dietlibc; then
> >       case $cc_basename in
> > @@ -5946,7 +5946,7 @@ if test "$_lt_caught_CXX_error" != yes; then
> >          _LT_TAGVAR(inherit_rpath, $1)=yes
> >          ;;
> >
> > -      linux* | k*bsd*-gnu | kopensolaris*-gnu)
> > +      linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
> >          case $cc_basename in
> >            KCC*)
> >           # Kuck and Associates, Inc. (KAI) C++ Compiler
> > @@ -6598,7 +6598,7 @@ interix[[3-9]]*)
> >    _LT_TAGVAR(postdeps,$1)=
> >    ;;
> >
> > -linux*)
> > +linux* | uclinux*)
> >    case `$CC -V 2>&1 | sed 5q` in
> >    *Sun\ C*)
> >      # Sun C++ 5.9
> >
>
>