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Remove TLS configure tests.

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There seemed to be support in response to
<https://sourceware.org/ml/libc-alpha/2015-10/msg00510.html> for
removing configure tests that exist only to produce errors, where we
expect that tool versions failing the tests would also fail the tests
of minimum GCC / binutils versions.

This patch removes the tests for TLS support as one instance of such
tests.  Since the addition of TLS emulation support in GCC 4.3, I
don't think these tests would have failed even if proper TLS support
(as required by glibc) was missing in that architecture's GCC back
end, so any new glibc ports wanting a substantive test (if there are
actual GCC or binutils versions for those architectures, with
supported version numbers, missing TLS support) would have needed an
architecture-specific test anyway.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).

	* configure.ac (libc_cv_gcc___thread): Remove configure test.
	(libc_cv_gcc_tls_model_attr): Likewise.
	* configure: Regenerated.
This commit is contained in:
Joseph Myers 2015-10-27 10:48:05 +00:00
parent e4f5eae8f0
commit 7a4cb4ad11
3 changed files with 4 additions and 82 deletions
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4
ChangeLog
View File

@ -1,5 +1,9 @@
2015-10-27 Joseph Myers <joseph@codesourcery.com>
* configure.ac (libc_cv_gcc___thread): Remove configure test.
(libc_cv_gcc_tls_model_attr): Likewise.
* configure: Regenerated.
* configure.ac (libc_cv_need_minus_P): Remove configure test.
* configure: Regenerated.
* Makeconfig (asm-CPPFLAGS): Remove reference to -P in comment.

52
configure vendored
View File

@ -6142,58 +6142,6 @@ if test "$libc_cv_gcc_builtin_redirection" = no; then
as_fn_error $? "support for the symbol redirection needed" "$LINENO" 5
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __thread" >&5
$as_echo_n "checking for __thread... " >&6; }
if ${libc_cv_gcc___thread+:} false; then :
$as_echo_n "(cached) " >&6
else
cat > conftest.c <<\EOF
__thread int a = 42;
EOF
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then
libc_cv_gcc___thread=yes
else
libc_cv_gcc___thread=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc___thread" >&5
$as_echo "$libc_cv_gcc___thread" >&6; }
if test "$libc_cv_gcc___thread" = no; then
as_fn_error $? "support for the __thread keyword is required" "$LINENO" 5
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for tls_model attribute" >&5
$as_echo_n "checking for tls_model attribute... " >&6; }
if ${libc_cv_gcc_tls_model_attr+:} false; then :
$as_echo_n "(cached) " >&6
else
cat > conftest.c <<\EOF
extern __thread int a __attribute__((tls_model ("initial-exec")));
EOF
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then
libc_cv_gcc_tls_model_attr=yes
else
libc_cv_gcc_tls_model_attr=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_tls_model_attr" >&5
$as_echo "$libc_cv_gcc_tls_model_attr" >&6; }
if test "$libc_cv_gcc_tls_model_attr" = no; then
as_fn_error $? "support for the tls_model attribute is required" "$LINENO" 5
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for compiler option to disable generation of FMA instructions" >&5
$as_echo_n "checking for compiler option to disable generation of FMA instructions... " >&6; }
if ${libc_cv_cc_nofma+:} false; then :

30
configure.ac
View File

@ -1564,36 +1564,6 @@ if test "$libc_cv_gcc_builtin_redirection" = no; then
AC_MSG_ERROR([support for the symbol redirection needed])
fi
dnl Check whether the compiler supports the __thread keyword.
AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
[cat > conftest.c <<\EOF
__thread int a = 42;
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
libc_cv_gcc___thread=yes
else
libc_cv_gcc___thread=no
fi
rm -f conftest*])
if test "$libc_cv_gcc___thread" = no; then
AC_MSG_ERROR([support for the __thread keyword is required])
fi
dnl Check whether the compiler supports the tls_model attribute.
AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
cat > conftest.c <<\EOF
extern __thread int a __attribute__((tls_model ("initial-exec")));
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
libc_cv_gcc_tls_model_attr=yes
else
libc_cv_gcc_tls_model_attr=no
fi
rm -f conftest*])
if test "$libc_cv_gcc_tls_model_attr" = no; then
AC_MSG_ERROR([support for the tls_model attribute is required])
fi
dnl Determine how to disable generation of FMA instructions.
AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
libc_cv_cc_nofma, [dnl