For PowerPC 64-bits little-endian (powerpc64le), a GCC version with
support for '-mno-gnu-attribute', '-mabi=ieeelongdouble', and
- '-mabi=ibmlondouble' is required. These additional features are
- required for building the GNU C Library with support for IEEE long
- double.
+ '-mabi=ibmlondouble' is required. Likewise, the compiler must also
+ support passing '-mlong-double-128' with the preceding options. As
+ of release, this implies GCC 7.4 and newer (excepting GCC 7.5.0,
+ see GCC PR94200). These additional features are required for
+ building the GNU C Library with support for IEEE long double.
For multi-arch support it is recommended to use a GCC which has
been built with support for GNU indirect functions. This ensures
For PowerPC 64-bits little-endian (powerpc64le), a GCC version with support
for @option{-mno-gnu-attribute}, @option{-mabi=ieeelongdouble}, and
-@option{-mabi=ibmlondouble} is required. These additional features are
-required for building the GNU C Library with support for IEEE long double.
+@option{-mabi=ibmlondouble} is required. Likewise, the compiler must also
+support passing @option{-mlong-double-128} with the preceding options. As
+of release, this implies GCC 7.4 and newer (excepting GCC 7.5.0, see GCC
+PR94200). These additional features are required for building the GNU C
+Library with support for IEEE long double.
+
+@c powerpc64le performs an autoconf test to verify the compiler compiles with
+@c commands like "$CC -c foo.c -mabi=ibmlongdouble -mlong-double-128".
For multi-arch support it is recommended to use a GCC which has been built with
support for GNU indirect functions. This ensures that correct debugging
CFLAGS-ieee128-qefgcvt.c += -mabi=ieeelongdouble -Wno-psabi -mno-gnu-attribute
CFLAGS-ieee128-qefgcvt_r.c += -mabi=ieeelongdouble -Wno-psabi -mno-gnu-attribute
-# Remove -mlong-double-128 because it does not work correctly with
-# -mabi=ibmlongdoule in some GCC versions, e.g. GCC 7.
-$(foreach o,$(all-object-suffixes),$(objpfx)ieee128-qefgcvt$(o)): \
- sysdep-CFLAGS := $(filter-out -mlong-double-128, $(sysdep-CFLAGS))
-$(foreach o,$(all-object-suffixes),$(objpfx)ieee128-qefgcvt_r$(o)): \
- sysdep-CFLAGS := $(filter-out -mlong-double-128, $(sysdep-CFLAGS))
-
tests-internal += tst-ibm128-warn tst-ieee128-warn
tests-internal += tst-ibm128-error tst-ieee128-error
tests-internal += tst-ibm128-efgcvt tst-ieee128-efgcvt
$(foreach r,$(ldbl-extra-routines),$(objpfx)$(r)-internal^)
obj-suf-foreach = $(foreach suf,$(all-object-suffixes),$(subst ^,$(suf),$(1)))
-# Remove -mlong-double-128 because it does not work correctly with
-# -mabi=ibmlongdoule in some GCC versions, e.g. GCC 7.
-$(call obj-suf-foreach,$(ldbl-ibm128-files)): \
- sysdep-CFLAGS := $(filter-out -mlong-double-128, $(sysdep-CFLAGS))
-
# Explicitly add -mabi=ibm-long-double to required files.
$(call obj-suf-foreach,$(ldbl-ibm128-files)): \
sysdep-CFLAGS += -mabi=ibmlongdouble
critic_missing="$critic_missing __builtin_signbit is broken. GCC 7.4 or newer is required to resolve (PR83862)."
fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if $CC compiles with -mabi=ieeelongdouble and -mlong-double-128" >&5
+$as_echo_n "checking if $CC compiles with -mabi=ieeelongdouble and -mlong-double-128... " >&6; }
+if ${libc_cv_compiler_powerpc64le_ldbl128_mabi+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -mabi=ieeelongdouble -mlong-double-128"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+long double x;
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ libc_cv_compiler_powerpc64le_ldbl128_mabi=yes
+else
+ libc_cv_compiler_powerpc64le_ldbl128_mabi=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+CFLAGS="$save_CFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_compiler_powerpc64le_ldbl128_mabi" >&5
+$as_echo "$libc_cv_compiler_powerpc64le_ldbl128_mabi" >&6; }
+if test "$libc_cv_compiler_powerpc64le_ldbl128_mabi" == "no"; then :
+ critic_missing="$critic_missing The compiler must support -mabi=ieeelongdouble and -mlongdouble simultaneously."
+fi
+
for ac_prog in $OBJCOPY
do
# Extract the first word of "$ac_prog", so it can be a program name with args.
AS_IF([test "$libc_cv_compiler_powerpc64le_ice" != "yes"],
[critic_missing="$critic_missing __builtin_signbit is broken. GCC 7.4 or newer is required to resolve (PR83862)."])
+dnl Some old compiler versions give out error messages when combining
+dnl -mabi=% and -mlong-double-128. i.e GCC 7.5.0 (PR94200)
+AC_CACHE_CHECK([if $CC compiles with -mabi=ieeelongdouble and -mlong-double-128],
+ libc_cv_compiler_powerpc64le_ldbl128_mabi, [dnl
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -mabi=ieeelongdouble -mlong-double-128"
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+long double x;
+]])],
+ [libc_cv_compiler_powerpc64le_ldbl128_mabi=yes],
+ [libc_cv_compiler_powerpc64le_ldbl128_mabi=no])
+CFLAGS="$save_CFLAGS"])
+AS_IF([test "$libc_cv_compiler_powerpc64le_ldbl128_mabi" == "no"],
+ [critic_missing="$critic_missing The compiler must support -mabi=ieeelongdouble and -mlongdouble simultaneously."])
+
dnl objcopy (binutils) 2.26 or newer required to support the --update-section
dnl feature for fixing up .gnu.attribute section with IEEE ldbl.
AC_CHECK_PROG_VER(OBJCOPY, $OBJCOPY, --version,
projects / thirdparty / glibc.git / commitdiff
