Correct min_of_type handling of _Float128.

The math_private.h macro min_of_type has broken _Float128 handling:
instead of passing its type argument to the key __EXPR_FLT128 macro,
it passes x, which is not a macro argument but whatever variable
called x happens to be visible in the calling function.  If that
variable has the wrong type, the wrong one of long double and
_Float128 can get chosen.  In particular, this applies to some
_Complex long double functions (where x happens to have type _Complex
long double, resulting in min_of_type returning a _Float128 value when
it should return a long double value).  For some reason, this only
caused test failures for me on x86_64 with GCC 6 but not GCC 7 (I
suspect it triggers known bugs in conversions from x86 long double to
_Float128 that are present in GCC 6's soft-fp).

Tested for x86_64 (in conjunction with float128 patches).

	* sysdeps/generic/math_private.h (__EXPR_FLT128): Do not apply
	typeof to argument passed to __builtin_types_compatible_p.
	(min_of_type): Pass type argument, not x, to __EXPR_FLT128.

1 files changed, 4 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index b9d30100d9..cd886956ae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2017-06-22  Joseph Myers  <joseph@codesourcery.com>
 
+	* sysdeps/generic/math_private.h (__EXPR_FLT128): Do not apply
+	typeof to argument passed to __builtin_types_compatible_p.
+	(min_of_type): Pass type argument, not x, to __EXPR_FLT128.
+
 	* math/w_acos_template.c [__USE_WRAPPER_TEMPLATE]: Include
 	<errno.h>.
 	* math/w_acosh_template.c [__USE_WRAPPER_TEMPLATE]: Likewise.