[PATCH v2 1/6] Provide an additional macro expansion for F128 in stdlib/tst-strtod.h

["Gabriel F. T. Gomes" <gftg at linux dot vnet dot ibm dot com>]

New since v1.

-- 8< --
The macro F128 in stdlib/tst-strtod.h is defined to provide the literal
suffix for _Float128 constants.  It uses the macro __f128 (), which is
defined in bits/floatn.h to provide the correct literal suffix depending on
what is provided by the compiler.

However, F128 was not being expanded and only worked correctly, when
compiling with GCC 7 (or greater), since F128 is the literal suffix itself.
This patch adds an additional macro expansion so that the macro F128
expands to the correct literal suffix on older compilers.

	* stdlib/tst-strtod.h (MMFUNC): New macro to provide an addition
	macro expansion.
	(GEN_TEST_STRTOD_FOREACH): Use MMFUNC for _Float128.
---
 stdlib/tst-strtod.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/stdlib/tst-strtod.h b/stdlib/tst-strtod.h
index e23ac3f..bc82ee0 100644
--- a/stdlib/tst-strtod.h
+++ b/stdlib/tst-strtod.h
@@ -33,12 +33,16 @@
 # define IF_FLOAT128(x)
 #endif
 
+/* Provide an extra parameter expansion for mfunc.  */
+#define MMFUNC(mmfunc, ...) mmfunc (__VA_ARGS__)
+
 /* Splat n variants of the same test for the various strtod functions.  */
 #define GEN_TEST_STRTOD_FOREACH(mfunc, ...)				      \
   mfunc (  f,       float, strfromf, f, f, ##__VA_ARGS__)		      \
   mfunc (  d,      double, strfromd,  ,  , ##__VA_ARGS__)		      \
   mfunc ( ld, long double, strfroml, L, l, ##__VA_ARGS__)		      \
-  IF_FLOAT128 (mfunc (f128, _Float128, strfromf128, F128, f128, ##__VA_ARGS__))
+  IF_FLOAT128 (MMFUNC							      \
+   (mfunc, f128, _Float128, strfromf128, F128, f128, ##__VA_ARGS__))
 /* The arguments to the generated macros are:
    FSUF - Function suffix
    FTYPE - float type
-- 
2.4.11