https://gcc.gnu.org/g:18b148bccc683473e2545c9098ebab7d8eb96ca7
commit 18b148bccc683473e2545c9098ebab7d8eb96ca7
Author: Michael Meissner <meiss...@linux.ibm.com>
Date: Sat Jun 15 02:57:27 2024 -0400
Do not build libgcc if GCC is not configured for at least power8
2024-06-15 Michael Meissner <meiss...@linux.ibm.com>
libgcc/
* config.host (powerpc*-linux*): Do not build the IEEE 128-bit
support
libraries unless GCC is configured for at least power8 by default.
* configure.ac (powerpc*-linux*): Likewise.
* configure: Regenerate.
Diff:
---
libgcc/config.host | 14 ++++++++------
libgcc/configure | 9 ++++++++-
libgcc/configure.ac | 9 ++++++++-
3 files changed, 24 insertions(+), 8 deletions(-)
diff --git a/libgcc/config.host b/libgcc/config.host
index 9fae51d4ce7d..9e3b21e98fdd 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -1290,16 +1290,18 @@ powerpc*-*-linux*)
;;
esac
+ # If the compiler is not configured for IEEE 128-bit, do not include the
+ # power9 and power10 hardware support libraries
if test $libgcc_cv_powerpc_float128 = yes; then
tmake_file="${tmake_file} rs6000/t-float128"
- fi
- if test $libgcc_cv_powerpc_float128_hw = yes; then
- tmake_file="${tmake_file} rs6000/t-float128-hw"
- fi
+ if test $libgcc_cv_powerpc_float128_hw = yes; then
+ tmake_file="${tmake_file} rs6000/t-float128-hw"
- if test $libgcc_cv_powerpc_3_1_float128_hw = yes; then
- tmake_file="${tmake_file} rs6000/t-float128-p10-hw"
+ if test $libgcc_cv_powerpc_3_1_float128_hw = yes; then
+ tmake_file="${tmake_file}
rs6000/t-float128-p10-hw"
+ fi
+ fi
fi
extra_parts="$extra_parts ecrti.o ecrtn.o ncrti.o ncrtn.o"
diff --git a/libgcc/configure b/libgcc/configure
index a69d314374a3..f61c9c9b3937 100755
--- a/libgcc/configure
+++ b/libgcc/configure
@@ -5184,9 +5184,16 @@ case ${host} in
# check if we have VSX (ISA 2.06) support to build the software libraries, and
# whether the assembler can handle xsaddqp for hardware support. Also check if
# a new glibc is being used so that __builtin_cpu_supports can be used.
+#
+# Originally we added -mabi=altivec -mvsx to the tests to see if we could
+# support IEEE 128-bit. This would mean that even if the compiler was
+# configured for power5, it would build the IEEE 128-bit libraries by adding
+# -mvsx. Instead if you want IEEE 128-bit support, you have to configure the
+# compiler to build ISA 2.06 (power8) by default. We do add -mfloat128 to
+# cater to systems where IEEE 128-bit might not be enabled by default.
powerpc*-*-linux*)
saved_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
+ CFLAGS="$CFLAGS -mfloat128"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for PowerPC ISA 2.06 to
build __float128 libraries" >&5
$as_echo_n "checking for PowerPC ISA 2.06 to build __float128 libraries... "
>&6; }
if ${libgcc_cv_powerpc_float128+:} false; then :
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index c2749fe09584..d9941c0b1a6a 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -407,9 +407,16 @@ case ${host} in
# check if we have VSX (ISA 2.06) support to build the software libraries, and
# whether the assembler can handle xsaddqp for hardware support. Also check if
# a new glibc is being used so that __builtin_cpu_supports can be used.
+#
+# Originally we added -mabi=altivec -mvsx to the tests to see if we could
+# support IEEE 128-bit. This would mean that even if the compiler was
+# configured for power5, it would build the IEEE 128-bit libraries by adding
+# -mvsx. Instead if you want IEEE 128-bit support, you have to configure the
+# compiler to build ISA 2.06 (power8) by default. We do add -mfloat128 to
+# cater to systems where IEEE 128-bit might not be enabled by default.
powerpc*-*-linux*)
saved_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
+ CFLAGS="$CFLAGS -mfloat128"
AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
[libgcc_cv_powerpc_float128],
[AC_COMPILE_IFELSE(
