[PATCH v3 2/5] powerpc: Add redirection for finitef128, isinf128, and isnanf128

["Gabriel F. T. Gomes" <gabriel at inconstante dot eti dot br>]

No changes since v2.

Changes since v1:

  - Added comments to explain the need to redefine __finitef, __finitel,
    and __finitef128 in s_finite.c.  Likewise for isinf and isnan.

-- 8< --
On powerpc64le, compiler support for float128 is not enabled by default
on gcc.  To enable it, the flag -mfloat128 must be passed as a command
line option to the compiler.  This means that only the few files that
actively have -mfloat128 passed as an argument get compiler support for
float128, whereas all other files don't.

When -mfloat128 becomes enabled by default on powerpc [1], all the files
that do not currently have compiler support for float128 enabled during
their compilation, will start to have it.  This will lead to build
errors in s_finite.c, s_isinf.c, and s_isnan.c.

The errors are due to the unintended macro expansion of __finitef128 to
__redirect_finitef128 in math/bits/mathcalls-helper-functions.h.  In
that header, __MATHDECL_1 takes '__finite' and 'f128' as arguments and
concatenates them, but '__finite' has been redefined in s_finite.c.
This effect was already true for the 'float' and 'long double' versions
and is now true for float128.  Likewise for isinsff128 and isnanf128.

This patch defines __finitef128 as __redirect___finitef128 in
sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c, similarly to what's
done for the float and long double versions of these functions, to get
rid of the build error.  Likewise for isinff128 and isnanf128.

[1] https://gcc.gnu.org/ml/gcc-patches/2017-08/msg01028.html

Tested for powerpc64 and powerpc64le.

	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c
	(__finitef128): Define to __redirect___finitef128.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c
	(__isinff128): Define to __redirect___isinff128.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
	(__isnanf128): Define to __redirect___isnanf128.
---
 sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c | 7 +++++++
 sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c  | 7 +++++++
 sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c  | 7 +++++++
 3 files changed, 21 insertions(+)

diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c
index a5ec36b72f..0382bfb95c 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c
@@ -17,8 +17,15 @@
    <http://www.gnu.org/licenses/>.  */
 
 #define __finite __redirect___finite
+
+/* The following definitions, although not related to the 'double'
+   version of 'finite', are required to compensate for the unintended
+   macro expansion of __finitef to __redirect___finitef, etc. in
+   math/bits/mathcalls-helper-functions.h.  */
 #define __finitef __redirect___finitef
 #define __finitel __redirect___finitel
+#define __finitef128 __redirect___finitef128
+
 #include <math.h>
 #include <math_ldbl_opt.h>
 #include <shlib-compat.h>
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c
index 9c6789c7bd..43827557a3 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c
@@ -17,8 +17,15 @@
    <http://www.gnu.org/licenses/>.  */
 
 #define __isinf __redirect___isinf
+
+/* The following definitions, although not related to the 'double'
+   version of 'isinf', are required to compensate for the unintended
+   macro expansion of __isinff to __redirect___isinff, etc. in
+   math/bits/mathcalls-helper-functions.h.  */
 #define __isinff __redirect___isinff
 #define __isinfl __redirect___isinfl
+#define __isinff128 __redirect___isinff128
+
 #include <math.h>
 #include <math_ldbl_opt.h>
 #include <shlib-compat.h>
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
index 3cfe1793da..bbc59808a4 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
@@ -17,8 +17,15 @@
    <http://www.gnu.org/licenses/>.  */
 
 #define __isnan __redirect___isnan
+
+/* The following definitions, although not related to the 'double'
+   version of 'isnan', are required to compensate for the unintended
+   macro expansion of __isnanf to __redirect___isnanf, etc. in
+   math/bits/mathcalls-helper-functions.h.  */
 #define __isnanf __redirect___isnanf
 #define __isnanl __redirect___isnanl
+#define __isnanf128 __redirect___isnanf128
+
 #include <math.h>
 #include <math_ldbl_opt.h>
 #include <shlib-compat.h>
-- 
2.13.5