The IEEE-128 (__float128 / KFmode) soft-float support functions in
libgcc are only built when libgcc_cv_powerpc_float128 is set, and the
ISA-2.06 configure check that sets it only runs for powerpc*-*-linux*.
On powerpc64le-*-freebsd*, where long double is IEEE binary128, they are
needed just as much (libgfortran and any long-double code references
e.g. __addkf3, __eqkf2), so run the check there too.
Also require __ibm128 in the test, not just VSX: the t-float128 sources
the check enables include quad-float128.h, which uses __ibm128. That
type is only available when the target has 128-bit long double, so on a
target/multilib where long double is 64-bit (e.g. a pre-IEEE FreeBSD
release) the VSX-only test would pass but the build would then fail with
"unknown type name '__ibm128'". Requiring __ibm128 makes the check
reflect what the sources need; it is a no-op on glibc, which always has
128-bit long double on these configurations.
libgcc/ChangeLog:
* configure.ac (powerpc*-*-freebsd*): Run the PowerPC ISA 2.06
__float128 check. Require __ibm128 in the test.
* configure: Regenerate.
Signed-off-by: Piotr Kubaj <[email protected]>
---
libgcc/configure.ac | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -432,13 +432,14 @@
# 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.
-powerpc*-*-linux*)
+powerpc*-*-linux* | powerpc*-*-freebsd*)
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
[libgcc_cv_powerpc_float128],
[AC_COMPILE_IFELSE(
- [AC_LANG_SOURCE([vector double dadd (vector double a, vector double b) {
return a + b; }])],
+ [AC_LANG_SOURCE([vector double dadd (vector double a, vector double b) {
return a + b; }
+__ibm128 conftest_ibm128;])],
[libgcc_cv_powerpc_float128=yes],
[libgcc_cv_powerpc_float128=no])])
--
2.49.0
