ffsl, ffsll: Fix compilation error on Android.

* lib/string.in.h: On Android as well, include <strings.h>.
* m4/ffsl.m4 (gl_FUNC_FFSL): Use a specific link test instead of
AC_CHECK_FUNCS_ONCE.
* m4/ffsll.m4 (gl_FUNC_FFSLL): Likewise.
* doc/glibc-functions/ffsl.texi: Mention Android problems.
* doc/glibc-functions/ffsll.texi: Likewise.

2 files changed, 8 insertions, 2 deletions

diff --git a/doc/glibc-functions/ffsl.texi b/doc/glibc-functions/ffsl.texi
index 441383cc38..fa80a5cb28 100644
--- a/doc/glibc-functions/ffsl.texi
+++ b/doc/glibc-functions/ffsl.texi
@@ -14,9 +14,12 @@ FreeBSD 5.2.1, NetBSD 9.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5
 @item
 This function is declared in @code{<strings.h>} instead of @code{<string.h>}
 on some platforms:
-AIX 7.2.
+AIX 7.2, Android 13.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+This function is only defined as an inline function on some platforms:
+Android 13.
 @end itemize
diff --git a/doc/glibc-functions/ffsll.texi b/doc/glibc-functions/ffsll.texi
index 41e701e87e..7912d451fc 100644
--- a/doc/glibc-functions/ffsll.texi
+++ b/doc/glibc-functions/ffsll.texi
@@ -14,7 +14,7 @@ Mac OS X 10.5, FreeBSD 6.0, NetBSD 9.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX
 @item
 This function is declared in @code{<strings.h>} instead of @code{<string.h>}
 on some platforms:
-AIX 7.2.
+AIX 7.2, Android 13.
 @item
 This function returns completely wrong values on some platforms:
 AIX 7.2 in 32-bit mode.
@@ -22,4 +22,7 @@ AIX 7.2 in 32-bit mode.
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+This function is only defined as an inline function on some platforms:
+Android 13.
 @end itemize