The *_HAS_* floating-point feature macros are defined as 0/1 rather than
#undef/#define settings by gcc/c-family/c-cppbuiltin.c. Consequently we
choose to use infinity and NaN features even with non-IEEE-754 targets
such as `vax-netbsdelf' that lack them, causing build warnings and
failures like:
In file included from .../libgfortran/generated/maxval_r4.c:26:
.../libgfortran/generated/maxval_r4.c: In function 'maxval_r4':
.../libgfortran/libgfortran.h:292:30: warning: target format does not support
infinity
292 | # define GFC_REAL_4_INFINITY __builtin_inff ()
| ^~~~~~~~~~~~~~
.../libgfortran/generated/maxval_r4.c:149:19:
note: in expansion of macro 'GFC_REAL_4_INFINITY'
149 | result = -GFC_REAL_4_INFINITY;
| ^~~~~~~~~~~~~~~~~~~
.../libgfortran/generated/maxval_r4.c: In function 'mmaxval_r4':
.../libgfortran/libgfortran.h:292:30: warning: target format does not support
infinity
292 | # define GFC_REAL_4_INFINITY __builtin_inff ()
| ^~~~~~~~~~~~~~
.../libgfortran/generated/maxval_r4.c:363:19:
note: in expansion of macro 'GFC_REAL_4_INFINITY'
363 | result = -GFC_REAL_4_INFINITY;
| ^~~~~~~~~~~~~~~~~~~
{standard input}: Assembler messages:
{standard input}:204: Fatal error: Can't relocate expression
make[3]: *** [Makefile:3358: maxval_r4.lo] Error 1
Correct the checks then for __FLT_HAS_INFINITY__, __DBL_HAS_INFINITY__,
__LDBL_HAS_INFINITY__, __FLT_HAS_QUIET_NAN__, __DBL_HAS_QUIET_NAN__, and
__LDBL_HAS_QUIET_NAN__ to match semantics and remove build issues coming
from the misinterpretation of these macros.
libgfortran/
* libgfortran.h: Use #if rather than #ifdef with
__FLT_HAS_INFINITY__, __DBL_HAS_INFINITY__,
__LDBL_HAS_INFINITY__, __FLT_HAS_QUIET_NAN__,
__DBL_HAS_QUIET_NAN__, and __LDBL_HAS_QUIET_NAN__.
---
libgfortran/libgfortran.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
gcc-libgfortran-fp-has.diff
Index: gcc/libgfortran/libgfortran.h
===================================================================
--- gcc.orig/libgfortran/libgfortran.h
+++ gcc/libgfortran/libgfortran.h
@@ -288,13 +288,13 @@ typedef GFC_UINTEGER_4 gfc_char4_t;
/* M{IN,AX}{LOC,VAL} need also infinities and NaNs if supported. */
-#ifdef __FLT_HAS_INFINITY__
+#if __FLT_HAS_INFINITY__
# define GFC_REAL_4_INFINITY __builtin_inff ()
#endif
-#ifdef __DBL_HAS_INFINITY__
+#if __DBL_HAS_INFINITY__
# define GFC_REAL_8_INFINITY __builtin_inf ()
#endif
-#ifdef __LDBL_HAS_INFINITY__
+#if __LDBL_HAS_INFINITY__
# ifdef HAVE_GFC_REAL_10
# define GFC_REAL_10_INFINITY __builtin_infl ()
# endif
@@ -306,13 +306,13 @@ typedef GFC_UINTEGER_4 gfc_char4_t;
# endif
# endif
#endif
-#ifdef __FLT_HAS_QUIET_NAN__
+#if __FLT_HAS_QUIET_NAN__
# define GFC_REAL_4_QUIET_NAN __builtin_nanf ("")
#endif
-#ifdef __DBL_HAS_QUIET_NAN__
+#if __DBL_HAS_QUIET_NAN__
# define GFC_REAL_8_QUIET_NAN __builtin_nan ("")
#endif
-#ifdef __LDBL_HAS_QUIET_NAN__
+#if __LDBL_HAS_QUIET_NAN__
# ifdef HAVE_GFC_REAL_10
# define GFC_REAL_10_QUIET_NAN __builtin_nanl ("")
# endif
