4 files changed, 15 insertions, 0 deletions
diff --git a/lib/math.in.h b/lib/math.in.h
index 61850d1c76..a0efefdacd 100644
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -519,6 +519,7 @@ extern int gl_signbitd (double arg);
 extern int gl_signbitl (long double arg);
 #  if __GNUC__ >= 2 && !__STRICT_ANSI__
 #   if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
+#    define gl_signbitf_OPTIMIZED_MACRO
 #    define gl_signbitf(arg) \
        ({ union { float _value;						\
                   unsigned int _word[(sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int)]; \
@@ -528,6 +529,7 @@ extern int gl_signbitl (long double arg);
         })
 #   endif
 #   if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
+#    define gl_signbitd_OPTIMIZED_MACRO
 #    define gl_signbitd(arg) \
        ({ union { double _value;						\
                   unsigned int _word[(sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)]; \
@@ -537,6 +539,7 @@ extern int gl_signbitl (long double arg);
         })
 #   endif
 #   if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
+#    define gl_signbitl_OPTIMIZED_MACRO
 #    define gl_signbitl(arg) \
        ({ union { long double _value;					\
                   unsigned int _word[(sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)]; \
diff --git a/lib/signbitd.c b/lib/signbitd.c
index 37625fcbf5..30f7e14709 100644
--- a/lib/signbitd.c
+++ b/lib/signbitd.c
@@ -23,6 +23,10 @@
 #include "isnand-nolibm.h"
 #include "float+.h"
 
+#ifdef gl_signbitd_OPTIMIZED_MACRO
+# undef gl_signbitd
+#endif
+
 int
 gl_signbitd (double arg)
 {
diff --git a/lib/signbitf.c b/lib/signbitf.c
index d539dbee8d..c3d5545234 100644
--- a/lib/signbitf.c
+++ b/lib/signbitf.c
@@ -23,6 +23,10 @@
 #include "isnanf-nolibm.h"
 #include "float+.h"
 
+#ifdef gl_signbitf_OPTIMIZED_MACRO
+# undef gl_signbitf
+#endif
+
 int
 gl_signbitf (float arg)
 {
diff --git a/lib/signbitl.c b/lib/signbitl.c
index aabb76b67f..84d6493d8d 100644
--- a/lib/signbitl.c
+++ b/lib/signbitl.c
@@ -23,6 +23,10 @@
 #include "isnanl-nolibm.h"
 #include "float+.h"
 
+#ifdef gl_signbitl_OPTIMIZED_MACRO
+# undef gl_signbitl
+#endif
+
 int
 gl_signbitl (long double arg)
 {