The attached program, when compiled with "gcc -O2" (gcc version >= 4.4),
returns with exit code 0 without ever invoking the exp2l() function.
Apparently GCC knows about identities for <math.h> functions. A 'volatile'
keyword is necessary to disable these identity-based optimizations.
For reliability, add this 'volatile' keyword in the idiom of these
autoconf tests.
2019-01-20 Bruno Haible <br...@clisp.org>
Defeat current GCC optimizations in math autoconf tests.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Mark function pointer as 'volatile'.
* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
* m4/ilogb.m4 (gl_FUNC_ILOGB_WORKS): Likewise.
* m4/ilogbf.m4 (gl_FUNC_ILOGBF_WORKS): Likewise.
* m4/ilogbl.m4 (gl_FUNC_ILOGBL_WORKS): Likewise.
* m4/log.m4 (gl_FUNC_LOG): Likewise.
* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
* m4/log1pl.m4 (gl_FUNC_LOG1PL): Likewise.
* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
* m4/modf.m4 (gl_FUNC_MODF): Likewise.
* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL): Likewise.
* m4/round.m4 (gl_FUNC_ROUND): Likewise.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
diff --git a/m4/cbrtl.m4 b/m4/cbrtl.m4
index e0f7362..dc867db 100644
--- a/m4/cbrtl.m4
+++ b/m4/cbrtl.m4
@@ -1,4 +1,4 @@
-# cbrtl.m4 serial 7
+# cbrtl.m4 serial 8
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -59,7 +59,7 @@ int main (int argc, char *argv[])
"C"
#endif
long double cbrtl (long double);
- long double (*my_cbrtl) (long double) = argc ? cbrtl : dummy;
+ long double (* volatile my_cbrtl) (long double) = argc ? cbrtl : dummy;
long double f;
/* Test cbrtl(-0.0).
This test fails on IRIX 6.5. */
diff --git a/m4/ceil.m4 b/m4/ceil.m4
index 1b11b84..5522284 100644
--- a/m4/ceil.m4
+++ b/m4/ceil.m4
@@ -1,4 +1,4 @@
-# ceil.m4 serial 12
+# ceil.m4 serial 13
dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -32,7 +32,7 @@ AC_DEFUN([gl_FUNC_CEIL],
static double dummy (double f) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_ceil) (double) = argc ? ceil : dummy;
+ double (* volatile my_ceil) (double) = argc ? ceil : dummy;
int result = 0;
/* Test whether ceil (-0.0) is -0.0. */
if (signbitd (minus_zerod) && !signbitd (my_ceil (minus_zerod)))
diff --git a/m4/ceilf.m4 b/m4/ceilf.m4
index de4a809..65b4cff 100644
--- a/m4/ceilf.m4
+++ b/m4/ceilf.m4
@@ -1,4 +1,4 @@
-# ceilf.m4 serial 16
+# ceilf.m4 serial 17
dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -39,7 +39,7 @@ AC_DEFUN([gl_FUNC_CEILF],
static float dummy (float f) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_ceilf) (float) = argc ? ceilf : dummy;
+ float (* volatile my_ceilf) (float) = argc ? ceilf : dummy;
int result = 0;
/* Test whether ceilf (-0.0f) is -0.0f. */
if (signbitf (minus_zerof) && !signbitf (my_ceilf (minus_zerof)))
diff --git a/m4/ceill.m4 b/m4/ceill.m4
index 2663d4c..863c344 100644
--- a/m4/ceill.m4
+++ b/m4/ceill.m4
@@ -1,4 +1,4 @@
-# ceill.m4 serial 17
+# ceill.m4 serial 18
dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -42,7 +42,7 @@ AC_DEFUN([gl_FUNC_CEILL],
static long double dummy (long double f) { return 0; }
int main (int argc, char *argv[])
{
- long double (*my_ceill) (long double) = argc ? ceill : dummy;
+ long double (* volatile my_ceill) (long double) = argc ? ceill : dummy;
/* Test whether ceill (-0.3L) is -0.0L. */
if (signbitl (minus_zerol) && !signbitl (my_ceill (-0.3L)))
return 1;
diff --git a/m4/exp2l.m4 b/m4/exp2l.m4
index d687e7d..20630cc 100644
--- a/m4/exp2l.m4
+++ b/m4/exp2l.m4
@@ -1,4 +1,4 @@
-# exp2l.m4 serial 5
+# exp2l.m4 serial 6
dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -50,7 +50,7 @@ static long double dummy (long double x) { return 0; }
static long double zero;
int main (int argc, char *argv[])
{
- long double (*my_exp2l) (long double) = argc ? exp2l : dummy;
+ long double (* volatile my_exp2l) (long double) = argc ? exp2l : dummy;
int result = 0;
/* This test fails on OpenBSD 4.9, where exp2l(NaN) = 0.0. */
if (exp2l (zero / zero) == 0.0L)
diff --git a/m4/expm1.m4 b/m4/expm1.m4
index 789f9ac..fcea1df 100644
--- a/m4/expm1.m4
+++ b/m4/expm1.m4
@@ -1,4 +1,4 @@
-# expm1.m4 serial 5
+# expm1.m4 serial 6
dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -75,7 +75,7 @@ AC_DEFUN([gl_FUNC_EXPM1],
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_expm1) (double) = argc ? expm1 : dummy;
+ double (* volatile my_expm1) (double) = argc ? expm1 : dummy;
double y = my_expm1 (minus_zerod);
if (!(y == 0.0) || (signbitd (minus_zerod) && !signbitd (y)))
return 1;
diff --git a/m4/floor.m4 b/m4/floor.m4
index 25a80b9..7b3d965 100644
--- a/m4/floor.m4
+++ b/m4/floor.m4
@@ -1,4 +1,4 @@
-# floor.m4 serial 11
+# floor.m4 serial 12
dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -32,7 +32,7 @@ AC_DEFUN([gl_FUNC_FLOOR],
static double dummy (double f) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_floor) (double) = argc ? floor : dummy;
+ double (* volatile my_floor) (double) = argc ? floor : dummy;
/* Test whether floor (-0.0) is -0.0. */
if (signbitd (minus_zerod) && !signbitd (my_floor (minus_zerod)))
return 1;
diff --git a/m4/floorf.m4 b/m4/floorf.m4
index 6713df8..5fad8a5 100644
--- a/m4/floorf.m4
+++ b/m4/floorf.m4
@@ -1,4 +1,4 @@
-# floorf.m4 serial 15
+# floorf.m4 serial 16
dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -39,7 +39,7 @@ AC_DEFUN([gl_FUNC_FLOORF],
static float dummy (float f) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_floorf) (float) = argc ? floorf : dummy;
+ float (* volatile my_floorf) (float) = argc ? floorf : dummy;
/* Test whether floorf (-0.0f) is -0.0f. */
if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof)))
return 1;
diff --git a/m4/fmod.m4 b/m4/fmod.m4
index 0b61649..898e9e8 100644
--- a/m4/fmod.m4
+++ b/m4/fmod.m4
@@ -1,4 +1,4 @@
-# fmod.m4 serial 6
+# fmod.m4 serial 7
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -39,7 +39,7 @@ numeric_equal (double x, double y)
static double dummy (double x, double y) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_fmod) (double, double) = argc ? fmod : dummy;
+ double (* volatile my_fmod) (double, double) = argc ? fmod : dummy;
int result = 0;
double f;
/* Test fmod(...,0.0).
diff --git a/m4/fmodf.m4 b/m4/fmodf.m4
index 5a6d7da..42c64ab 100644
--- a/m4/fmodf.m4
+++ b/m4/fmodf.m4
@@ -1,4 +1,4 @@
-# fmodf.m4 serial 8
+# fmodf.m4 serial 9
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -46,7 +46,7 @@ numeric_equal (float x, float y)
static float dummy (float x, float y) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_fmodf) (float, float) = argc ? fmodf : dummy;
+ float (* volatile my_fmodf) (float, float) = argc ? fmodf : dummy;
float f;
/* Test fmodf(...,0.0f).
This test fails on OSF/1 5.1. */
diff --git a/m4/fmodl.m4 b/m4/fmodl.m4
index 8d32031..1e3e9aa 100644
--- a/m4/fmodl.m4
+++ b/m4/fmodl.m4
@@ -1,4 +1,4 @@
-# fmodl.m4 serial 8
+# fmodl.m4 serial 9
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -57,7 +57,7 @@ numeric_equal (long double x, long double y)
static long double dummy (long double x, long double y) { return 0; }
int main (int argc, char *argv[])
{
- long double (*my_fmodl) (long double, long double) = argc ? fmodl : dummy;
+ long double (* volatile my_fmodl) (long double, long double) = argc ? fmodl
: dummy;
long double f;
/* Test fmodl(...,0.0L).
This test fails on OSF/1 5.1. */
diff --git a/m4/hypot.m4 b/m4/hypot.m4
index 713dfa2..a7242a2 100644
--- a/m4/hypot.m4
+++ b/m4/hypot.m4
@@ -1,4 +1,4 @@
-# hypot.m4 serial 6
+# hypot.m4 serial 7
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -42,7 +42,7 @@ double zero;
double one = 1.0;
int main (int argc, char *argv[])
{
- double (*my_hypot) (double, double) = argc ? hypot : dummy;
+ double (* volatile my_hypot) (double, double) = argc ? hypot : dummy;
double f;
/* Test hypot(NaN,Infinity).
This test fails on OSF/1 5.1 and native Windows. */
diff --git a/m4/hypotf.m4 b/m4/hypotf.m4
index 9e0773e..80da9ae 100644
--- a/m4/hypotf.m4
+++ b/m4/hypotf.m4
@@ -1,4 +1,4 @@
-# hypotf.m4 serial 7
+# hypotf.m4 serial 8
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -58,7 +58,7 @@ float zero;
float one = 1.0f;
int main (int argc, char *argv[])
{
- float (*my_hypotf) (float, float) = argc ? hypotf : dummy;
+ float (* volatile my_hypotf) (float, float) = argc ? hypotf : dummy;
float f;
/* Test hypotf(NaN,Infinity).
This test fails on OSF/1 5.1 and native Windows. */
diff --git a/m4/hypotl.m4 b/m4/hypotl.m4
index 45cc999..dcced7e 100644
--- a/m4/hypotl.m4
+++ b/m4/hypotl.m4
@@ -1,4 +1,4 @@
-# hypotl.m4 serial 8
+# hypotl.m4 serial 9
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -58,7 +58,7 @@ long double zero;
long double one = 1.0L;
int main (int argc, char *argv[])
{
- long double (*my_hypotl) (long double, long double) = argc ? hypotl : dummy;
+ long double (* volatile my_hypotl) (long double, long double) = argc ?
hypotl : dummy;
long double f;
/* Test hypotl(NaN,Infinity).
This test fails on OSF/1 5.1 and native Windows. */
diff --git a/m4/ilogb.m4 b/m4/ilogb.m4
index 67d9d22..53c3f05 100644
--- a/m4/ilogb.m4
+++ b/m4/ilogb.m4
@@ -1,4 +1,4 @@
-# ilogb.m4 serial 3
+# ilogb.m4 serial 4
dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -85,7 +85,7 @@ static double zero;
static int dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
- int (*my_ilogb) (double) = argc ? ilogb : dummy;
+ int (* volatile my_ilogb) (double) = argc ? ilogb : dummy;
int result = 0;
/* This test fails on OpenBSD 4.9, AIX 5.1. */
{
diff --git a/m4/ilogbf.m4 b/m4/ilogbf.m4
index 9874006..cf0ebe4 100644
--- a/m4/ilogbf.m4
+++ b/m4/ilogbf.m4
@@ -1,4 +1,4 @@
-# ilogbf.m4 serial 3
+# ilogbf.m4 serial 4
dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -87,7 +87,7 @@ static float zero;
static int dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
- int (*my_ilogbf) (float) = argc ? ilogbf : dummy;
+ int (* volatile my_ilogbf) (float) = argc ? ilogbf : dummy;
int result = 0;
/* This test fails on OpenBSD 4.9. */
{
diff --git a/m4/ilogbl.m4 b/m4/ilogbl.m4
index a164698..c8ba52a 100644
--- a/m4/ilogbl.m4
+++ b/m4/ilogbl.m4
@@ -1,4 +1,4 @@
-# ilogbl.m4 serial 2
+# ilogbl.m4 serial 3
dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -106,7 +106,7 @@ volatile long double x;
static int dummy (long double x) { return 0; }
int main (int argc, char *argv[])
{
- int (*my_ilogbl) (long double) = argc ? ilogbl : dummy;
+ int (* volatile my_ilogbl) (long double) = argc ? ilogbl : dummy;
int result = 0;
/* This test fails on Haiku 2017. */
{
diff --git a/m4/log.m4 b/m4/log.m4
index b02acb6..a4e2a5c 100644
--- a/m4/log.m4
+++ b/m4/log.m4
@@ -1,4 +1,4 @@
-# log.m4 serial 8
+# log.m4 serial 9
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -46,7 +46,7 @@ numeric_equal (double x, double y)
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_log) (double) = argc ? log : dummy;
+ double (* volatile my_log) (double) = argc ? log : dummy;
/* Test log(negative).
This test fails on NetBSD 5.1, Solaris 11.4. */
double y = my_log (-1.0);
diff --git a/m4/log10.m4 b/m4/log10.m4
index 102683b..6af6624 100644
--- a/m4/log10.m4
+++ b/m4/log10.m4
@@ -1,4 +1,4 @@
-# log10.m4 serial 8
+# log10.m4 serial 9
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -46,7 +46,7 @@ numeric_equal (double x, double y)
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_log10) (double) = argc ? log10 : dummy;
+ double (* volatile my_log10) (double) = argc ? log10 : dummy;
/* Test log10(negative).
This test fails on NetBSD 5.1, Solaris 11.4. */
double y = my_log10 (-1.0);
diff --git a/m4/log10f.m4 b/m4/log10f.m4
index 1d9ee61..47501dd 100644
--- a/m4/log10f.m4
+++ b/m4/log10f.m4
@@ -1,4 +1,4 @@
-# log10f.m4 serial 9
+# log10f.m4 serial 10
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -56,7 +56,7 @@ numeric_equal (float x, float y)
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_log10f) (float) = argc ? log10f : dummy;
+ float (* volatile my_log10f) (float) = argc ? log10f : dummy;
/* Test log10f(negative).
This test fails on NetBSD 5.1. */
float y = my_log10f (-1.0f);
diff --git a/m4/log1p.m4 b/m4/log1p.m4
index 864a6d8..b5dd430 100644
--- a/m4/log1p.m4
+++ b/m4/log1p.m4
@@ -1,4 +1,4 @@
-# log1p.m4 serial 5
+# log1p.m4 serial 6
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -41,7 +41,7 @@ AC_DEFUN([gl_FUNC_LOG1P],
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_log1p) (double) = argc ? log1p : dummy;
+ double (* volatile my_log1p) (double) = argc ? log1p : dummy;
/* This test fails on AIX, HP-UX 11. */
double y = my_log1p (minus_zerod);
if (!(y == 0.0) || (signbitd (minus_zerod) && !signbitd (y)))
diff --git a/m4/log1pf.m4 b/m4/log1pf.m4
index f4055f8..4a2c35a 100644
--- a/m4/log1pf.m4
+++ b/m4/log1pf.m4
@@ -1,4 +1,4 @@
-# log1pf.m4 serial 5
+# log1pf.m4 serial 6
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -50,7 +50,7 @@ AC_DEFUN([gl_FUNC_LOG1PF],
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_log1pf) (float) = argc ? log1pf : dummy;
+ float (* volatile my_log1pf) (float) = argc ? log1pf : dummy;
/* This test fails on OpenBSD 4.9, AIX 7.1. */
float y = my_log1pf (minus_zerof);
if (!(y == 0.0f) || (signbitf (minus_zerof) && !signbitf (y)))
diff --git a/m4/log1pl.m4 b/m4/log1pl.m4
index 462c0e5..7def391 100644
--- a/m4/log1pl.m4
+++ b/m4/log1pl.m4
@@ -1,4 +1,4 @@
-# log1pl.m4 serial 5
+# log1pl.m4 serial 6
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -41,7 +41,7 @@ AC_DEFUN([gl_FUNC_LOG1PL],
static long double dummy (long double x) { return 0; }
int main (int argc, char *argv[])
{
- long double (*my_log1pl) (long double) = argc ? log1pl : dummy;
+ long double (* volatile my_log1pl) (long double) = argc ? log1pl : dummy;
/* This test fails on AIX 7.1, IRIX 6.5. */
long double y = my_log1pl (minus_zerol);
if (!(y == 0.0L) || (signbitl (minus_zerol) && !signbitl (y)))
diff --git a/m4/log2.m4 b/m4/log2.m4
index 7fd56fa..bd8b3cf 100644
--- a/m4/log2.m4
+++ b/m4/log2.m4
@@ -1,4 +1,4 @@
-# log2.m4 serial 7
+# log2.m4 serial 8
dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -67,7 +67,7 @@ numeric_equal (double x, double y)
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_log2) (double) = argc ? log2 : dummy;
+ double (* volatile my_log2) (double) = argc ? log2 : dummy;
/* Test log2(negative).
This test fails on NetBSD 5.1 and Solaris 10/x86_64. */
double y = my_log2 (-1.0);
diff --git a/m4/log2f.m4 b/m4/log2f.m4
index b294b7f..63b8458 100644
--- a/m4/log2f.m4
+++ b/m4/log2f.m4
@@ -1,4 +1,4 @@
-# log2f.m4 serial 7
+# log2f.m4 serial 8
dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -68,7 +68,7 @@ numeric_equal (float x, float y)
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_log2f) (float) = argc ? log2f : dummy;
+ float (* volatile my_log2f) (float) = argc ? log2f : dummy;
/* Test log2f(negative).
This test fails on NetBSD 5.1 and Solaris 10/x86_64. */
float y = my_log2f (-1.0f);
diff --git a/m4/logf.m4 b/m4/logf.m4
index ac0aab7..6b9e5bb 100644
--- a/m4/logf.m4
+++ b/m4/logf.m4
@@ -1,4 +1,4 @@
-# logf.m4 serial 9
+# logf.m4 serial 10
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -56,7 +56,7 @@ numeric_equal (float x, float y)
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_logf) (float) = argc ? logf : dummy;
+ float (* volatile my_logf) (float) = argc ? logf : dummy;
/* Test logf(negative).
This test fails on NetBSD 5.1. */
float y = my_logf (-1.0f);
diff --git a/m4/modf.m4 b/m4/modf.m4
index 6d86d32..b503844 100644
--- a/m4/modf.m4
+++ b/m4/modf.m4
@@ -1,4 +1,4 @@
-# modf.m4 serial 5
+# modf.m4 serial 6
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -41,7 +41,7 @@ double zero;
double minus_one = - 1.0;
int main (int argc, char *argv[])
{
- double (*my_modf) (double, double *) = argc ? modf : dummy;
+ double (* volatile my_modf) (double, double *) = argc ? modf : dummy;
int result = 0;
double i;
double f;
diff --git a/m4/modff.m4 b/m4/modff.m4
index c7b2a17..e1fbf1d 100644
--- a/m4/modff.m4
+++ b/m4/modff.m4
@@ -1,4 +1,4 @@
-# modff.m4 serial 7
+# modff.m4 serial 8
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -49,7 +49,7 @@ float zero;
float minus_one = - 1.0f;
int main (int argc, char *argv[])
{
- float (*my_modff) (float, float *) = argc ? modff : dummy;
+ float (* volatile my_modff) (float, float *) = argc ? modff : dummy;
int result = 0;
float i;
float f;
diff --git a/m4/modfl.m4 b/m4/modfl.m4
index 8b5bc7b..fc32cd64 100644
--- a/m4/modfl.m4
+++ b/m4/modfl.m4
@@ -1,4 +1,4 @@
-# modfl.m4 serial 5
+# modfl.m4 serial 6
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -49,7 +49,7 @@ long double zero;
long double minus_one = - 1.0L;
int main (int argc, char *argv[])
{
- long double (*my_modfl) (long double, long double *) = argc ? modfl : dummy;
+ long double (* volatile my_modfl) (long double, long double *) = argc ?
modfl : dummy;
long double i;
long double f;
/* Test modfl(-Inf,...).
diff --git a/m4/remainder.m4 b/m4/remainder.m4
index 0e9d19e..58548ba 100644
--- a/m4/remainder.m4
+++ b/m4/remainder.m4
@@ -1,4 +1,4 @@
-# remainder.m4 serial 6
+# remainder.m4 serial 7
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -79,7 +79,7 @@ numeric_equal (double x, double y)
static double dummy (double x, double y) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_remainder) (double, double) = argc ? remainder : dummy;
+ double (* volatile my_remainder) (double, double) = argc ? remainder : dummy;
double f;
/* Test remainder(...,0.0).
This test fails on OSF/1 5.1. */
diff --git a/m4/remainderf.m4 b/m4/remainderf.m4
index ff4e98d..5ab511a 100644
--- a/m4/remainderf.m4
+++ b/m4/remainderf.m4
@@ -1,4 +1,4 @@
-# remainderf.m4 serial 10
+# remainderf.m4 serial 11
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -82,7 +82,7 @@ numeric_equal (float x, float y)
static float dummy (float x, float y) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_remainderf) (float, float) = argc ? remainderf : dummy;
+ float (* volatile my_remainderf) (float, float) = argc ? remainderf : dummy;
float f;
/* Test remainderf(...,0.0f).
This test fails on OSF/1 5.1. */
diff --git a/m4/remainderl.m4 b/m4/remainderl.m4
index cfa94f5..85ed6be 100644
--- a/m4/remainderl.m4
+++ b/m4/remainderl.m4
@@ -1,4 +1,4 @@
-# remainderl.m4 serial 9
+# remainderl.m4 serial 10
dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -87,7 +87,7 @@ numeric_equal (long double x, long double y)
static long double dummy (long double x, long double y) { return 0; }
int main (int argc, char *argv[])
{
- long double (*my_remainderl) (long double, long double) = argc ? remainderl
: dummy;
+ long double (* volatile my_remainderl) (long double, long double) = argc ?
remainderl : dummy;
long double f;
/* Test remainderl(...,0.0L).
This test fails on OSF/1 5.1. */
diff --git a/m4/round.m4 b/m4/round.m4
index cbc9f02..49ae315 100644
--- a/m4/round.m4
+++ b/m4/round.m4
@@ -1,4 +1,4 @@
-# round.m4 serial 19
+# round.m4 serial 20
dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -103,7 +103,7 @@ double round (double);
static double dummy (double f) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_round) (double) = argc ? round : dummy;
+ double (* volatile my_round) (double) = argc ? round : dummy;
/* Test whether round (-0.0) is -0.0. */
if (signbitd (minus_zerod) && !signbitd (my_round (minus_zerod)))
return 1;
diff --git a/m4/roundf.m4 b/m4/roundf.m4
index e0530ba..07f816e 100644
--- a/m4/roundf.m4
+++ b/m4/roundf.m4
@@ -1,4 +1,4 @@
-# roundf.m4 serial 20
+# roundf.m4 serial 21
dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -99,7 +99,7 @@ float roundf (float);
static float dummy (float f) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_roundf) (float) = argc ? roundf : dummy;
+ float (* volatile my_roundf) (float) = argc ? roundf : dummy;
int result = 0;
/* Test whether roundf (-0.0f) is -0.0f. */
if (signbitf (minus_zerof) && !signbitf (my_roundf (minus_zerof)))
diff --git a/m4/roundl.m4 b/m4/roundl.m4
index 0bc0391..95eed1b 100644
--- a/m4/roundl.m4
+++ b/m4/roundl.m4
@@ -1,4 +1,4 @@
-# roundl.m4 serial 17
+# roundl.m4 serial 18
dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -50,7 +50,7 @@ long double roundl (long double);
static long double dummy (long double f) { return 0; }
int main (int argc, char *argv[])
{
- long double (*my_roundl) (long double) = argc ? roundl : dummy;
+ long double (* volatile my_roundl) (long double) = argc ? roundl : dummy;
int result = 0;
/* Test whether roundl (-0.0L) is -0.0L. */
if (signbitl (minus_zerol) && !signbitl (my_roundl (minus_zerol)))
diff --git a/m4/trunc.m4 b/m4/trunc.m4
index ef8d59b..056d56d 100644
--- a/m4/trunc.m4
+++ b/m4/trunc.m4
@@ -1,4 +1,4 @@
-# trunc.m4 serial 12
+# trunc.m4 serial 13
dnl Copyright (C) 2007, 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -62,7 +62,7 @@ AC_DEFUN([gl_FUNC_TRUNC],
static double dummy (double f) { return 0; }
int main (int argc, char *argv[])
{
- double (*my_trunc) (double) = argc ? trunc : dummy;
+ double (* volatile my_trunc) (double) = argc ? trunc : dummy;
/* Test whether trunc (-0.0) is -0.0. */
if (signbitd (minus_zerod) && !signbitd (my_trunc (minus_zerod)))
return 1;
diff --git a/m4/truncf.m4 b/m4/truncf.m4
index af6eeeb..1ee987b 100644
--- a/m4/truncf.m4
+++ b/m4/truncf.m4
@@ -1,4 +1,4 @@
-# truncf.m4 serial 12
+# truncf.m4 serial 13
dnl Copyright (C) 2007, 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -62,7 +62,7 @@ AC_DEFUN([gl_FUNC_TRUNCF],
static float dummy (float f) { return 0; }
int main (int argc, char *argv[])
{
- float (*my_truncf) (float) = argc ? truncf : dummy;
+ float (* volatile my_truncf) (float) = argc ? truncf : dummy;
/* Test whether truncf (-0.0f) is -0.0f. */
if (signbitf (minus_zerof) && !signbitf (my_truncf (minus_zerof)))
return 1;
diff --git a/m4/truncl.m4 b/m4/truncl.m4
index 65f1fce..b03d04c 100644
--- a/m4/truncl.m4
+++ b/m4/truncl.m4
@@ -1,4 +1,4 @@
-# truncl.m4 serial 14
+# truncl.m4 serial 15
dnl Copyright (C) 2007-2008, 2010-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -95,7 +95,7 @@ int main()
static long double dummy (long double f) { return 0; }
int main (int argc, char *argv[])
{
- long double (*my_truncl) (long double) = argc ? truncl : dummy;
+ long double (* volatile my_truncl) (long double) = argc ? truncl : dummy;
/* Test whether truncl (-0.3L) is -0.0L. */
if (signbitl (minus_zerol) && !signbitl (my_truncl (-0.3L)))
return 1;
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <float.h>
#include <math.h>
/* Override the values of <float.h>, like done in float.in.h. */
#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if defined __i386__ && (defined __FreeBSD__ || defined __DragonFly__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
#endif
#if defined __sgi && (LDBL_MANT_DIG >= 106)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 106
# if defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
# endif
#endif
#undef exp2l
extern
#ifdef __cplusplus
"C"
#endif
long double exp2l (long double);
static long double dummy (long double x) { return 0; }
static long double zero;
int main (int argc, char *argv[])
{
long double (*my_exp2l) (long double) = argc ? exp2l : dummy;
int result = 0;
/* This test fails on NetBSD 8.0. */
{
const long double TWO_LDBL_MANT_DIG = /* 2^LDBL_MANT_DIG */
(long double) (1U << ((LDBL_MANT_DIG - 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 2) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 3) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 4) / 5));
long double x = 11.358L;
long double err = (my_exp2l (x) * my_exp2l (- x) - 1.0L) * TWO_LDBL_MANT_DIG;
if (!(err >= -100.0L && err <= 100.0L))
result |= 1;
}
return result;
}
