Fix powerpc64le problem from last ldbl-opt patch.

This patch fixes a problem on powerpc64le that I missed in initial
testing of my last patch to ldbl-opt.  In the specific case of
powerpc64le, the weak aliases for exp10l and remainderl do not get
defined in the generic wrappers because of how those wrappers
undefine and redefine weak_alias.  This patch restores those aliases
in the ldbl-opt code.

Tested (compilation only) for powerpc64le with build-many-glibcs.py.

	* sysdeps/ieee754/ldbl-opt/w_exp10l_compat.c [LIBM_SVID_COMPAT &&
	!LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)] (weak_alias): Undefine and
	redefine.
	[LIBM_SVID_COMPAT && !LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)]
	(exp10l): Define as weak alias.
	* sysdeps/ieee754/ldbl-opt/w_remainderl_compat.c [LIBM_SVID_COMPAT
	&& !LONG_DOUBLE_COMPAT (libm, GLIBC_2_0)] (weak_alias): Undefine
	and redefine.
	[LIBM_SVID_COMPAT && !LONG_DOUBLE_COMPAT (libm, GLIBC_2_0)]
	(remainderl): Define as weak alias.

3 files changed, 27 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index a7bcaa689b..757462f14e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,16 @@
 2017-09-18  Joseph Myers  <joseph@codesourcery.com>
 
+	* sysdeps/ieee754/ldbl-opt/w_exp10l_compat.c [LIBM_SVID_COMPAT &&
+	!LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)] (weak_alias): Undefine and
+	redefine.
+	[LIBM_SVID_COMPAT && !LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)]
+	(exp10l): Define as weak alias.
+	* sysdeps/ieee754/ldbl-opt/w_remainderl_compat.c [LIBM_SVID_COMPAT
+	&& !LONG_DOUBLE_COMPAT (libm, GLIBC_2_0)] (weak_alias): Undefine
+	and redefine.
+	[LIBM_SVID_COMPAT && !LONG_DOUBLE_COMPAT (libm, GLIBC_2_0)]
+	(remainderl): Define as weak alias.
+
 	* math/s_fmal.c: Include <libm-alias-ldouble.h>.
 	(fmal): Define using libm_alias_ldouble.
 	* math/w_acoshl_compat.c: Include <libm-alias-ldouble.h>.
diff --git a/sysdeps/ieee754/ldbl-opt/w_exp10l_compat.c b/sysdeps/ieee754/ldbl-opt/w_exp10l_compat.c
index 1c0e8754dd..dd5915e66e 100644
--- a/sysdeps/ieee754/ldbl-opt/w_exp10l_compat.c
+++ b/sysdeps/ieee754/ldbl-opt/w_exp10l_compat.c
@@ -5,6 +5,14 @@
 #define compat_symbol(l,n,a,v)
 #include <math/w_exp10l_compat.c>
 #if LIBM_SVID_COMPAT
+# if !LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)
+/* If ldbl-opt is used without special versioning for exp10l being
+   required, the generic code does not define exp10l because of the
+   undefine and redefine of weak_alias above.  */
+#  undef weak_alias
+#  define weak_alias(name, aliasname) _weak_alias (name, aliasname)
+weak_alias (__exp10l, exp10l)
+# endif
 # if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_27)
 /* compat_symbol was undefined and redefined above to avoid the
    default pow10l compat symbol at version GLIBC_2_1 (as for ldbl-opt
diff --git a/sysdeps/ieee754/ldbl-opt/w_remainderl_compat.c b/sysdeps/ieee754/ldbl-opt/w_remainderl_compat.c
index 9314117eda..bb9bac0db7 100644
--- a/sysdeps/ieee754/ldbl-opt/w_remainderl_compat.c
+++ b/sysdeps/ieee754/ldbl-opt/w_remainderl_compat.c
@@ -3,6 +3,14 @@
 #define weak_alias(n,a)
 #include <math/w_remainderl_compat.c>
 #if LIBM_SVID_COMPAT
+# if !LONG_DOUBLE_COMPAT (libm, GLIBC_2_0)
+/* If ldbl-opt is used without special versioning for remainderl being
+   required, the generic code does not define remainderl because of
+   the undefine and redefine of weak_alias above.  */
+#  undef weak_alias
+#  define weak_alias(name, aliasname) _weak_alias (name, aliasname)
+weak_alias (__remainderl, remainderl)
+# endif
 strong_alias (__remainderl, __dreml)
 long_double_symbol (libm, __dreml, dreml);
 #endif