PowerPC: Don't assume all targets have GLIBC.
David reminded me that not all targets support GLIBC. This patch should fix my
previous committed patch not to use TARGET_GLIBC_MAJOR or TARGET_GLIBC_MINOR
unless they are defined.
I have done a bootstrap on a little endian power9 system and it was fine. Can
I check this patch into the master branch?
gcc/
2020-10-30 Michael Meissner <meiss...@linux.ibm.com>
* config/rs6000/rs6000.c (glibc_supports_ieee_128bit): New helper
function.
(rs6000_option_override_internal): Call it.
---
gcc/config/rs6000/rs6000.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 1d7e8878c45..a59dc919baa 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -3539,6 +3539,25 @@ rs6000_linux64_override_options ()
}
#endif
+/* Return true if we are using GLIBC, and it supports IEEE 128-bit long double.
+ This support is only in little endian GLIBC 2.32 or newer. */
+static bool
+glibc_supports_ieee_128bit (void)
+{
+#if defined (OPTION_GLIBC) \
+ && defined (TARGET_GLIBC_MAJOR) \
+ && defined (TARGET_GLIBC_MINOR)
+
+ if (OPTION_GLIBC
+ && !BYTES_BIG_ENDIAN
+ && DEFAULT_ABI == ABI_ELFv2
+ && ((TARGET_GLIBC_MAJOR * 1000) + TARGET_GLIBC_MINOR) >= 2032)
+ return true;
+#endif /* GLIBC provided. */
+
+ return false;
+}
+
/* Override command line options.
Combine build-specific configuration information with options
@@ -4173,9 +4192,8 @@ rs6000_option_override_internal (bool global_init_p)
static bool warned_change_long_double;
if (!warned_change_long_double
- && (!OPTION_GLIBC
- || (!lang_GNU_C () && !lang_GNU_CXX ())
- || ((TARGET_GLIBC_MAJOR * 1000) + TARGET_GLIBC_MINOR) < 2032))
+ && (!glibc_supports_ieee_128bit ()
+ || (!lang_GNU_C () && !lang_GNU_CXX ())))
{
if (TARGET_IEEEQUAD)
warning (OPT_Wpsabi, "Using IEEE extended precision "
--
2.22.0
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meiss...@linux.ibm.com, phone: +1 (978) 899-4797
