When compiling a testdir on Linux/sh4, I see this compilation error:
../../gllib/fma.c: In function 'rpl_fma':
../../gllib/fma.c:728:47: error: 'FE_DOWNWARD' undeclared (first use in this
function); did you mean 'FP_INT_DOWNWARD'?
728 | else if (rounding_mode == FE_DOWNWARD)
| ^~~~~~~~~~~
| FP_INT_DOWNWARD
../../gllib/fma.c:728:47: note: each undeclared identifier is reported only
once for each function it appears in
../../gllib/fma.c:730:47: error: 'FE_UPWARD' undeclared (first use in this
function)
730 | else if (rounding_mode == FE_UPWARD)
| ^~~~~~~~~
make[3]: *** [Makefile:9372: fma.o] Error 1
The cause is that sh4 has only two among the four rounding modes. The other
two are simply not defined in glibc's <bits/fenv.h>.
2021-08-28 Bruno Haible <br...@clisp.org>
fma: Fix compilation error on Linux/sh4.
* lib/fma.c (FUNC): Don't test for FE_DOWNWARD or FE_UPWARD when these
rounding modes are not defined.
diff --git a/lib/fma.c b/lib/fma.c
index 3bddb30f3..bee05719c 100644
--- a/lib/fma.c
+++ b/lib/fma.c
@@ -725,10 +725,14 @@ FUNC (DOUBLE x, DOUBLE y, DOUBLE z)
int rounding_mode = fegetround ();
if (rounding_mode == FE_TOWARDZERO)
round_up = 0;
+# if defined FE_DOWNWARD /* not defined on sh4 */
else if (rounding_mode == FE_DOWNWARD)
round_up = sign;
+# endif
+# if defined FE_UPWARD /* not defined on sh4 */
else if (rounding_mode == FE_UPWARD)
round_up = !sign;
+# endif
#else
/* Cf.
<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/float.h.html> */
int rounding_mode = FLT_ROUNDS;
