ldbl-128ibm-compat: Add strfmon_l with IEEE long double format

Similarly to what has been done for printf-like functions, more
specifically to the internal implementation in __vfprintf_internal, this
patch extends __vstrfmon_l_internal to deal with long double values with
binary128 format (as a third format option and reusing the float128
implementation).

Tested for powerpc64le, powerpc64, x86_64, and with build-many-glibcs.

Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/Makefile b/sysdeps/ieee754/ldbl-128ibm-compat/Makefile
index 61f47f2f83..6ec0739b4c 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/Makefile
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/Makefile
@@ -214,6 +214,18 @@ CFLAGS-test-syslog-chk-ieee128.c += -mfloat128 -mabi=ieeelongdouble -Wno-psabi
 CFLAGS-test-syslog-chk-ibm128.c += -mabi=ibmlongdouble -Wno-psabi
 endif
 
+ifeq ($(subdir),stdlib)
+ldbl-extra-routines += strfmon strfmon_l
+
+# Printing long double values with IEEE binary128 format reuses part
+# of the internal float128 implementation (__printf_fp, __printf_fphex,
+# and __float128 variables and union members).  Thus, the compilation of
+# the following files, must have -mfloat128 passed to the compiler.
+# Also, guarantee that they are compiled in IBM long double mode.
+CFLAGS-strfmon.c += -mfloat128 -mabi=ibmlongdouble
+CFLAGS-strfmon_l.c += -mfloat128 -mabi=ibmlongdouble
+endif
+
 # Add IEEE binary128 files as make targets.
 routines += $(foreach r,$(ldbl-extra-routines),ieee128-$(r))