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libstdc++: Remove _GLIBCXX_USE_INT128 autoconf macro 

We don't need to decide whether to use __int128 when running configure,
we can do so at compilation time by seeing if __SIZEOF_INT128__ is
defined and if it's greater than __SIZEOF_LONG_LONG__.

This removes another unnecessary architecture-specific config macro in
<bits/c++config.h>, so the same header can work for 32-bit or 64-bit
compilation on AIX.

libstdc++-v3/ChangeLog:

	* acinclude.m4 (GLIBCXX_ENABLE_INT128_FLOAT128): Remove
	checks for __int128 and rename to GLIBCXX_ENABLE_FLOAT128.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Adjust to use GLIBCXX_ENABLE_FLOAT128.
	* include/bits/random.h (_Select_uint_least_t<s, 1>):
	Use __SIZEOF_INT128__ to decide whether to use __int128.
	* include/std/charconv (__to_chars_unsigned_type): Likewise.
This commit is contained in:
Jonathan Wakely 2021-05-04 12:07:09 +01:00
parent 93f8cb4965
commit ad0a3be4df
6 changed files with 8 additions and 73 deletions
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36
libstdc++-v3/acinclude.m4
View File

@ -3049,15 +3049,14 @@ EOF
])
dnl
dnl Check for GNU 128-bit integer and floating point types.
dnl Check for GNU 128-bit floating point type.
dnl
dnl Note: also checks that the types aren't standard types.
dnl Note: also checks that the type isn't a standard types.
dnl
dnl Defines:
dnl _GLIBCXX_USE_INT128
dnl ENABLE_FLOAT128
dnl
AC_DEFUN([GLIBCXX_ENABLE_INT128_FLOAT128], [
AC_DEFUN([GLIBCXX_ENABLE_FLOAT128], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
@ -3065,34 +3064,7 @@ AC_DEFUN([GLIBCXX_ENABLE_INT128_FLOAT128], [
# Fake what AC_TRY_COMPILE does, without linking as this is
# unnecessary for this test.
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
template<typename T1, typename T2>
struct same
{ typedef T2 type; };
template<typename T>
struct same<T, T>;
int main()
{
typename same<long, __int128>::type i1;
typename same<long long, __int128>::type i2;
}
EOF
AC_MSG_CHECKING([for __int128])
if AC_TRY_EVAL(ac_compile); then
AC_DEFINE(_GLIBCXX_USE_INT128, 1,
[Define if __int128 is supported on this host.])
enable_int128=yes
else
enable_int128=no
fi
AC_MSG_RESULT($enable_int128)
rm -f conftest*
cat > conftest.$ac_ext << EOF
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
template<typename T1, typename T2>
struct same

3
libstdc++-v3/config.h.in
View File

@ -929,9 +929,6 @@
/* Define if get_nprocs is available in <sys/sysinfo.h>. */
#undef _GLIBCXX_USE_GET_NPROCS
/* Define if __int128 is supported on this host. */
#undef _GLIBCXX_USE_INT128
/* Define if LFS support is available. */
#undef _GLIBCXX_USE_LFS

36
libstdc++-v3/configure vendored
View File

@ -16218,7 +16218,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
# Fake what AC_TRY_COMPILE does, without linking as this is
# unnecessary for this test.
cat > conftest.$ac_ext << EOF
cat > conftest.$ac_ext << EOF
#line 16222 "configure"
template<typename T1, typename T2>
struct same
@ -16227,40 +16227,6 @@ template<typename T1, typename T2>
template<typename T>
struct same<T, T>;
int main()
{
typename same<long, __int128>::type i1;
typename same<long long, __int128>::type i2;
}
EOF
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __int128" >&5
$as_echo_n "checking for __int128... " >&6; }
if { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_compile\""; } >&5
(eval $ac_compile) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; then
$as_echo "#define _GLIBCXX_USE_INT128 1" >>confdefs.h
enable_int128=yes
else
enable_int128=no
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $enable_int128" >&5
$as_echo "$enable_int128" >&6; }
rm -f conftest*
cat > conftest.$ac_ext << EOF
#line 16256 "configure"
template<typename T1, typename T2>
struct same
{ typedef T2 type; };
template<typename T>
struct same<T, T>;
int main()
{
typename same<double, __float128>::type f1;

2
libstdc++-v3/configure.ac
View File

@ -153,7 +153,7 @@ GLIBCXX_ENABLE_THREADS
GLIBCXX_ENABLE_ATOMIC_BUILTINS
GLIBCXX_ENABLE_LOCK_POLICY
GLIBCXX_ENABLE_DECIMAL_FLOAT
GLIBCXX_ENABLE_INT128_FLOAT128
GLIBCXX_ENABLE_FLOAT128
if test "$enable_float128" = yes; then
port_specific_symbol_files="$port_specific_symbol_files \$(top_srcdir)/config/abi/pre/float128.ver"
fi

2
libstdc++-v3/include/bits/random.h
View File

@ -99,7 +99,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct _Select_uint_least_t<__s, 2>
{ typedef unsigned long long type; };
#ifdef _GLIBCXX_USE_INT128
#if __SIZEOF_INT128__ > __SIZEOF_LONG_LONG__
template<int __s>
struct _Select_uint_least_t<__s, 1>
{ typedef unsigned __int128 type; };

2
libstdc++-v3/include/std/charconv
View File

@ -94,7 +94,7 @@ namespace __detail
struct __to_chars_unsigned_type : __make_unsigned_selector_base
{
using _UInts = _List<unsigned int, unsigned long, unsigned long long
#if _GLIBCXX_USE_INT128
#if __SIZEOF_INT128__ > __SIZEOF_LONG_LONG__
, unsigned __int128
#endif
>;