Remove ENOSYS math/ function stubs [committed]

[Joseph Myers <joseph at codesourcery dot com>]

The math/ directory has various stub implementations of functions
(generally long double functions, plus sqrtf128) that set errno to
ENOSYS and print a message.

These are a relic of when the long double libm implementation in glibc
was originally incomplete.  They are only present for a limited set of
libm functions, not all those that would need implementing for any
hypothetical new long double format, and only for long double (plus
sqrtf128), not for other floating-point types.  I removed the
corresponding ENOSYS tests in the testsuite in
<https://sourceware.org/ml/libc-alpha/2013-05/msg00599.html>.

I think these stubs are an inherently different case from stubs for
functionality needing OS-specific implementations, since
floating-point formats are generally standardized between modern
processors (a new long double format does not seem likely - I'd expect
new ports all to have long double = binary128 or long double =
binary64 - though _Float16 functions *f16 are entirely possible in
future) and libm functions are generally only expected to fail for
domain / range / pole errors, not for other unknown system-specific
conditions the way the functions needing OS-specific implementations
may fail.

This patch removes these stub implementations.  The effect (which, as
noted above, was actually mostly already the case, given the
incompleteness of the set of stubs, and was certainly the case if you
wanted your libm port to *work* rather than just build) is that any
new long double format needs to provide a full set of functions for
the build to succeed; any port using ldbl-128 needs to provide sqrtl
(possibly using the soft-fp version from another port); any port using
ldbl-96 needs to provide all those functions that all of
x86_64/i386/ia64/m68k provide rather than getting from the ldbl-96
directory; any port with _Float128 as a type with a distinct format
needs to provide sqrtf128.

Tested for x86_64.  Also tested with build-many-glibcs.py that
installed stripped shared libraries are unchanged by the patch.  
Committed.

2017-09-15  Joseph Myers  <joseph@codesourcery.com>

	* math/e_acoshl.c: Remove.
	* math/e_acosl.c: Likewise.
	* math/e_asinl.c: Likewise.
	* math/e_atan2l.c: Likewise.
	* math/e_atanhl.c: Likewise.
	* math/e_coshl.c: Likewise.
	* math/e_expl.c: Likewise.
	* math/e_fmodl.c: Likewise.
	* math/e_gammal_r.c: Likewise.
	* math/e_hypotl.c: Likewise.
	* math/e_j0l.c: Likewise.
	* math/e_j1l.c: Likewise.
	* math/e_jnl.c: Likewise.
	* math/e_lgammal_r.c: Likewise.
	* math/e_log10l.c: Likewise.
	* math/e_log2l.c: Likewise.
	* math/e_logl.c: Likewise.
	* math/e_powl.c: Likewise.
	* math/e_rem_pio2l.c: Likewise.
	* math/e_sinhl.c: Likewise.
	* math/e_sqrtf128.c: Likewise.
	* math/e_sqrtl.c: Likewise.
	* math/k_cosl.c: Likewise.
	* math/k_sinl.c: Likewise.
	* math/k_tanl.c: Likewise.
	* math/s_asinhl.c: Likewise.
	* math/s_atanl.c: Likewise.
	* math/s_cbrtl.c: Likewise.
	* math/s_erfl.c: Likewise.
	* math/s_expm1l.c: Likewise.
	* math/s_log1pl.c: Likewise.
	* math/s_tanhl.c: Likewise.

diff --git a/math/e_acoshl.c b/math/e_acoshl.c
deleted file mode 100644
index cd426ed..0000000
--- a/math/e_acoshl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_acoshl (long double x)
-{
-  fputs ("__ieee754_acoshl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_acoshl, __acoshl_finite)
-
-stub_warning (acoshl)
diff --git a/math/e_acosl.c b/math/e_acosl.c
deleted file mode 100644
index e5b6971..0000000
--- a/math/e_acosl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_acosl (long double x)
-{
-  fputs ("__ieee754_acosl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_acosl, __acosl_finite)
-
-stub_warning (acosl)
diff --git a/math/e_asinl.c b/math/e_asinl.c
deleted file mode 100644
index d6a6d14..0000000
--- a/math/e_asinl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_asinl (long double x)
-{
-  fputs ("__ieee754_asinl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_asinl, __asinl_finite)
-
-stub_warning (asinl)
diff --git a/math/e_atan2l.c b/math/e_atan2l.c
deleted file mode 100644
index 2602c98..0000000
--- a/math/e_atan2l.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_atan2l (long double x, long double y)
-{
-  fputs ("__ieee754_atan2l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_atan2l, __atan2l_finite)
-
-stub_warning (atan2l)
diff --git a/math/e_atanhl.c b/math/e_atanhl.c
deleted file mode 100644
index a6cb507..0000000
--- a/math/e_atanhl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_atanhl (long double x)
-{
-  fputs ("__ieee754_atanhl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_atanhl, __atanhl_finite)
-
-stub_warning (__ieee754_atanhl)
diff --git a/math/e_coshl.c b/math/e_coshl.c
deleted file mode 100644
index 8bf7b20..0000000
--- a/math/e_coshl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_coshl (long double x)
-{
-  fputs ("__ieee754_coshl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_coshl, __coshl_finite)
-
-stub_warning (__ieee754_coshl)
diff --git a/math/e_expl.c b/math/e_expl.c
deleted file mode 100644
index 407d818..0000000
--- a/math/e_expl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_expl (long double x)
-{
-  fputs ("__ieee754_expl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_expl, __expl_finite)
-
-stub_warning (expl)
diff --git a/math/e_fmodl.c b/math/e_fmodl.c
deleted file mode 100644
index 61587e9..0000000
--- a/math/e_fmodl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_fmodl (long double x, long double y)
-{
-  fputs ("__ieee754_fmodl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_fmodl, __fmodl_finite)
-
-stub_warning (fmodl)
diff --git a/math/e_gammal_r.c b/math/e_gammal_r.c
deleted file mode 100644
index 9dbce67..0000000
--- a/math/e_gammal_r.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_gammal_r (long double x, int *signgamp)
-{
-  *signgamp = 0;
-  fputs ("__ieee754_gammal_r not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_gammal_r, __gammal_r_finite)
-
-stub_warning (__ieee754_gammal_r)
diff --git a/math/e_hypotl.c b/math/e_hypotl.c
deleted file mode 100644
index 6f3eb5f..0000000
--- a/math/e_hypotl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_hypotl (long double x, long double y)
-{
-  fputs ("__ieee754_hypotl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_hypotl, __hypotl_finite)
-
-stub_warning (__ieee754_hypotl)
diff --git a/math/e_j0l.c b/math/e_j0l.c
deleted file mode 100644
index 1451efd..0000000
--- a/math/e_j0l.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-long double
-__ieee754_j0l (long double x)
-{
-  fputs ("__ieee754_j0l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_j0l, __j0l_finite)
-
-stub_warning (j0l)
-
-long double
-__ieee754_y0l (long double x)
-{
-  fputs ("__ieee754_y0l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_y0l, __y0l_finite)
-
-stub_warning (y0l)
diff --git a/math/e_j1l.c b/math/e_j1l.c
deleted file mode 100644
index 6bb3017..0000000
--- a/math/e_j1l.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-long double
-__ieee754_j1l (long double x)
-{
-  fputs ("__ieee754_j1l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_j1l, __j1l_finite)
-
-stub_warning (j1l)
-
-long double
-__ieee754_y1l (long double x)
-{
-  fputs ("__ieee754_y1l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_y1l, __y1l_finite)
-
-stub_warning (y1l)
diff --git a/math/e_jnl.c b/math/e_jnl.c
deleted file mode 100644
index d9fddd0..0000000
--- a/math/e_jnl.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-long double
-__ieee754_jnl (int n, long double x)
-{
-  fputs ("__ieee754_jnl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_jnl, __jnl_finite)
-
-stub_warning (jnl)
-
-long double
-__ieee754_ynl (int n, long double x)
-{
-  fputs ("__ieee754_ynl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_ynl, __ynl_finite)
-
-stub_warning (ynl)
diff --git a/math/e_lgammal_r.c b/math/e_lgammal_r.c
deleted file mode 100644
index 3babf7f..0000000
--- a/math/e_lgammal_r.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-long double
-__ieee754_lgammal_r (long double x, int *signgamp)
-{
-  *signgamp = 0;
-  fputs ("__ieee754_lgammal_r not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_lgammal_r, __lgammal_r_finite)
-
-stub_warning (lgammal)
-stub_warning (lgammal_r)
diff --git a/math/e_log10l.c b/math/e_log10l.c
deleted file mode 100644
index c0b7dfd..0000000
--- a/math/e_log10l.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_log10l (long double x)
-{
-  fputs ("__ieee754_log10l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_log10l, __log10l_finite)
-
-stub_warning (log10l)
diff --git a/math/e_log2l.c b/math/e_log2l.c
deleted file mode 100644
index af7d039..0000000
--- a/math/e_log2l.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_log2l (long double x)
-{
-  fputs ("__ieee754_log2l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_log2l, __log2l_finite)
-
-stub_warning (log2l)
diff --git a/math/e_logl.c b/math/e_logl.c
deleted file mode 100644
index 7a4ea1b..0000000
--- a/math/e_logl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_logl (long double x)
-{
-  fputs ("__ieee754_logl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_logl, __logl_finite)
-
-stub_warning (logl)
diff --git a/math/e_powl.c b/math/e_powl.c
deleted file mode 100644
index 1013e2a..0000000
--- a/math/e_powl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_powl (long double x, long double y)
-{
-  fputs ("__ieee754_powl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_powl, __powl_finite)
-
-stub_warning (powl)
diff --git a/math/e_rem_pio2l.c b/math/e_rem_pio2l.c
deleted file mode 100644
index 2ea873b..0000000
--- a/math/e_rem_pio2l.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-int32_t
-__ieee754_rem_pio2l (long double x, long double *y)
-{
-  fputs ("__ieee754_rem_pio2l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0;
-}
-
-stub_warning (__ieee754_rem_pio2l)
diff --git a/math/e_sinhl.c b/math/e_sinhl.c
deleted file mode 100644
index 4bc4ac9..0000000
--- a/math/e_sinhl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_sinhl (long double x)
-{
-  fputs ("__ieee754_sinhl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_sinhl, __sinhl_finite)
-
-stub_warning (__ieee754_sinhl)
diff --git a/math/e_sqrtf128.c b/math/e_sqrtf128.c
deleted file mode 100644
index acf8ba4..0000000
--- a/math/e_sqrtf128.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-_Float128
-__ieee754_sqrtf128 (_Float128 x)
-{
-  fputs ("__ieee754_sqrtf128 not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_sqrtf128, __sqrtf128_finite)
-
-stub_warning (sqrtf128)
diff --git a/math/e_sqrtl.c b/math/e_sqrtl.c
deleted file mode 100644
index acbe74f..0000000
--- a/math/e_sqrtl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__ieee754_sqrtl (long double x)
-{
-  fputs ("__ieee754_sqrtl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-strong_alias (__ieee754_sqrtl, __sqrtl_finite)
-
-stub_warning (sqrtl)
diff --git a/math/k_cosl.c b/math/k_cosl.c
deleted file mode 100644
index 6dc72b4..0000000
--- a/math/k_cosl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-long double
-__kernel_cosl (long double x, long double y)
-{
-  fputs ("__kernel_cosl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-
-stub_warning (__kernel_cosl)
diff --git a/math/k_sinl.c b/math/k_sinl.c
deleted file mode 100644
index 0047942..0000000
--- a/math/k_sinl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-long double
-__kernel_sinl (long double x, long double y, int iy)
-{
-  fputs ("__kernel_sinl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-
-stub_warning (__kernel_sinl)
diff --git a/math/k_tanl.c b/math/k_tanl.c
deleted file mode 100644
index 8831f62..0000000
--- a/math/k_tanl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math_private.h>
-
-long double
-__kernel_tanl (long double x, long double y, int iy)
-{
-  fputs ("__kernel_tanl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-
-stub_warning (__kernel_tanl)
diff --git a/math/s_asinhl.c b/math/s_asinhl.c
deleted file mode 100644
index 8232fcd..0000000
--- a/math/s_asinhl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__asinhl(long double x)
-{
-  fputs ("__asinhl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-
-weak_alias (__asinhl, asinhl)
-stub_warning (asinhl)
diff --git a/math/s_atanl.c b/math/s_atanl.c
deleted file mode 100644
index 2957d70..0000000
--- a/math/s_atanl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__atanl (long double x)
-{
-  fputs ("__atanl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-weak_alias (__atanl, atanl)
-
-stub_warning (atanl)
diff --git a/math/s_cbrtl.c b/math/s_cbrtl.c
deleted file mode 100644
index 803010b..0000000
--- a/math/s_cbrtl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__cbrtl(long double x)
-{
-  fputs ("__cbrtl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-
-weak_alias (__cbrtl, cbrtl)
-stub_warning (cbrtl)
diff --git a/math/s_erfl.c b/math/s_erfl.c
deleted file mode 100644
index 7ae25d6..0000000
--- a/math/s_erfl.c
+++ /dev/null
@@ -1,25 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__erfl (long double x)
-{
-  fputs ("__erfl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-weak_alias (__erfl, erfl)
-
-stub_warning (erfl)
-
-long double
-__erfcl (long double x)
-{
-  fputs ("__erfcl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-weak_alias (__erfcl, erfcl)
-
-stub_warning (erfcl)
diff --git a/math/s_expm1l.c b/math/s_expm1l.c
deleted file mode 100644
index 070d068..0000000
--- a/math/s_expm1l.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__expm1l (long double x)
-{
-  fputs ("__expm1l not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-libm_hidden_def (__expm1l)
-weak_alias (__expm1l, expm1l)
-
-stub_warning (expm1l)
diff --git a/math/s_log1pl.c b/math/s_log1pl.c
deleted file mode 100644
index a216fb3..0000000
--- a/math/s_log1pl.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__log1pl (long double x)
-{
-  fputs ("__log1pl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-
-stub_warning (log1pl)
diff --git a/math/s_tanhl.c b/math/s_tanhl.c
deleted file mode 100644
index ece9a4c..0000000
--- a/math/s_tanhl.c
+++ /dev/null
@@ -1,14 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-#include <errno.h>
-
-long double
-__tanhl(long double x)
-{
-  fputs ("__tanhl not implemented\n", stderr);
-  __set_errno (ENOSYS);
-  return 0.0;
-}
-
-weak_alias (__tanhl, tanhl)
-stub_warning (tanhl)

-- 
Joseph S. Myers
joseph@codesourcery.com