Fix clog10 (-0 +/- 0i) (bug 16362).

This patch fixes the imaginary part of clog10 (-0 +/- 0i), which
should be +/-pi / log(10) by analogy with clog (the functions were
wrongly returning a result with imaginary part +/-pi, same as for
clog, and the tests matched the incorrect result, though both
functions and tests were correct for the similar case of clog10 (-inf
+/- 0i)).  Tested x86_64 and x86.

	[BZ #16362]
	* math/s_clog10.c (M_PI_LOG10E): New macro.
	(__clog10): Use M_PI_LOG10E instead of M_PI when real and
	imaginary parts are 0.
	* math/s_clog10f.c (M_PI_LOG10Ef): New macro.
	(__clog10f): Use M_PI_LOG10Ef instead of M_PI when real and
	imaginary parts are 0.
	* math/s_clog10l.c (M_PI_LOG10El): New macro.
	(__clog10l): Use M_PI_LOG10El instead of M_PIl when real and
	imaginary parts are 0.
	* math/libm-test.inc (clog10_test_data): Update expected results
	for when real and imaginary parts are 0.

1 files changed, 5 insertions, 5 deletions

diff --git a/NEWS b/NEWS
index a9cc5cb6ab..b34c9fc65e 100644
--- a/NEWS
+++ b/NEWS
@@ -9,11 +9,11 @@ Version 2.20
 
 * The following bugs are resolved with this release:
 
-  15347, 15804, 15894, 16002, 16198, 16284, 16348, 16357, 16447, 16532,
-  16545, 16574, 16599, 16600, 16609, 16610, 16611, 16613, 16623, 16632,
-  16634, 16639, 16642, 16649, 16670, 16674, 16677, 16680, 16683, 16689,
-  16695, 16701, 16706, 16707, 16712, 16713, 16714, 16731, 16743, 16758,
-  16759, 16760.
+  15347, 15804, 15894, 16002, 16198, 16284, 16348, 16357, 16362, 16447,
+  16532, 16545, 16574, 16599, 16600, 16609, 16610, 16611, 16613, 16623,
+  16632, 16634, 16639, 16642, 16649, 16670, 16674, 16677, 16680, 16683,
+  16689, 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16731, 16743,
+  16758, 16759, 16760.
 
 * Running the testsuite no longer terminates as soon as a test fails.
   Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,