Building a Gnulib testdir on Android (via Termux), I see these errors:
clang -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -DNO_XMALLOC -DEXEEXT=\"\"
-I. -I../../gllib -I.. -DGNULIB_STRICT_CHECKING=1
-I/data/data/com.termux/files/home/local/include -Wall -fvisibility=hidden -g
-O2 -c -o ffsl.o ../../gllib/ffsl.c
In file included from ../../gllib/ffsl.c:22:
../../gllib/ffsl.h:51:1: error: redefinition of 'ffsl'
FUNC (TYPE i)
^
../../gllib/ffsl.c:18:14: note: expanded from macro 'FUNC'
#define FUNC ffsl
^
/data/data/com.termux/files/usr/include/strings.h:92:29: note: previous
definition is here
__BIONIC_STRINGS_INLINE int ffsl(long __n) {
^
1 error generated.
make[4]: *** [Makefile:10687: ffsl.o] Error 1
clang -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -DNO_XMALLOC -DEXEEXT=\"\"
-I. -I../../gllib -I.. -DGNULIB_STRICT_CHECKING=1
-I/data/data/com.termux/files/home/local/include -Wall -fvisibility=hidden -g
-O2 -c -o ffsll.o ../../gllib/ffsll.c
In file included from ../../gllib/ffsll.c:24:
../../gllib/ffsl.h:51:1: error: redefinition of 'ffsll'
FUNC (TYPE i)
^
../../gllib/ffsll.c:18:14: note: expanded from macro 'FUNC'
#define FUNC ffsll
^
/data/data/com.termux/files/usr/include/strings.h:103:29: note: previous
definition is here
__BIONIC_STRINGS_INLINE int ffsll(long long __n) {
^
1 error generated.
make[4]: *** [Makefile:10687: ffsll.o] Error 1
The attached patches fixes them.
>From 0ff4d2d5894ec53eb8bc8930266e3e8e93f5b51b Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Tue, 3 Jan 2023 19:48:59 +0100
Subject: [PATCH 1/2] ffs: Document Android problem.
* doc/posix-functions/ffs.texi: Mention Android problem.
* m4/ffs.m4: Update comment.
---
ChangeLog | 6 ++++++
doc/posix-functions/ffs.texi | 3 +++
m4/ffs.m4 | 4 ++--
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 88d5faa592..fc20f7ebe4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2023-01-03 Bruno Haible <br...@clisp.org>
+
+ ffs: Document Android problem.
+ * doc/posix-functions/ffs.texi: Mention Android problem.
+ * m4/ffs.m4: Update comment.
+
2023-01-03 Bruno Haible <br...@clisp.org>
stdio: Fix error in C++ mode on Android, due to putw.
diff --git a/doc/posix-functions/ffs.texi b/doc/posix-functions/ffs.texi
index 2e65b2f712..69f897a7f8 100644
--- a/doc/posix-functions/ffs.texi
+++ b/doc/posix-functions/ffs.texi
@@ -15,4 +15,7 @@ mingw, MSVC 14.
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/m4/ffs.m4 b/m4/ffs.m4
index 3bc6f8eca8..848fd0aa1f 100644
--- a/m4/ffs.m4
+++ b/m4/ffs.m4
@@ -1,4 +1,4 @@
-# ffs.m4 serial 5
+# ffs.m4 serial 6
dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -9,7 +9,7 @@ AC_DEFUN([gl_FUNC_FFS],
AC_REQUIRE([gl_STRINGS_H_DEFAULTS])
dnl We can't use AC_CHECK_FUNC here, because ffs() is defined as a
- dnl static inline function when compiling for Android 4.2 or older.
+ dnl static inline function when compiling for Android 13 or older.
dnl But require that ffs() is declared; otherwise we may be using
dnl the GCC built-in function, which leads to warnings
dnl "warning: implicit declaration of function 'ffs'".
--
2.34.1
>From 7c4ee88821d4ee0adc6511a0f6ead0e5ed6518b2 Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Tue, 3 Jan 2023 21:33:32 +0100
Subject: [PATCH 2/2] 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.
---
ChangeLog | 8 ++++++++
doc/glibc-functions/ffsl.texi | 5 ++++-
doc/glibc-functions/ffsll.texi | 5 ++++-
lib/string.in.h | 5 +++--
m4/ffsl.m4 | 24 +++++++++++++++++++++---
m4/ffsll.m4 | 24 +++++++++++++++++++++---
6 files changed, 61 insertions(+), 10 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index fc20f7ebe4..59a916a13a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
2023-01-03 Bruno Haible <br...@clisp.org>
+ 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.
+
ffs: Document Android problem.
* doc/posix-functions/ffs.texi: Mention Android problem.
* m4/ffs.m4: Update comment.
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
diff --git a/lib/string.in.h b/lib/string.in.h
index e993b2fb6f..b2683b6e4c 100644
--- a/lib/string.in.h
+++ b/lib/string.in.h
@@ -59,10 +59,11 @@
# include <unistd.h>
#endif
-/* AIX 7.2 declares ffsl and ffsll in <strings.h>, not in <string.h>. */
+/* AIX 7.2 and Android 13 declare ffsl and ffsll in <strings.h>, not in
+ <string.h>. */
/* But in any case avoid namespace pollution on glibc systems. */
#if ((@GNULIB_FFSL@ || @GNULIB_FFSLL@ || defined GNULIB_POSIXCHECK) \
- && defined _AIX) \
+ && (defined _AIX || defined __ANDROID__)) \
&& ! defined __GLIBC__
# include <strings.h>
#endif
diff --git a/m4/ffsl.m4 b/m4/ffsl.m4
index 1d840e5b80..568e47cdaf 100644
--- a/m4/ffsl.m4
+++ b/m4/ffsl.m4
@@ -1,4 +1,4 @@
-# ffsl.m4 serial 2
+# ffsl.m4 serial 3
dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -11,8 +11,26 @@ AC_DEFUN([gl_FUNC_FFSL],
dnl Persuade glibc <string.h> to declare ffsl().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_FUNCS_ONCE([ffsl])
- if test $ac_cv_func_ffsl = no; then
+ dnl We can't use AC_CHECK_FUNC here, because ffsl() is defined as a
+ dnl static inline function when compiling for Android 13 or older.
+ dnl But require that ffsl() is declared; otherwise we may be using
+ dnl the GCC built-in function, which leads to warnings
+ dnl "warning: implicit declaration of function 'ffsl'".
+ AC_CACHE_CHECK([for ffsl], [gl_cv_func_ffsl],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ #include <strings.h>
+ long x;
+ ]],
+ [[int (*func) (long) = ffsl;
+ return func (x);
+ ]])
+ ],
+ [gl_cv_func_ffsl=yes],
+ [gl_cv_func_ffsl=no])
+ ])
+ if test $gl_cv_func_ffsl = no; then
HAVE_FFSL=0
fi
])
diff --git a/m4/ffsll.m4 b/m4/ffsll.m4
index 8414272c6e..d2bffe6e81 100644
--- a/m4/ffsll.m4
+++ b/m4/ffsll.m4
@@ -1,4 +1,4 @@
-# ffsll.m4 serial 3
+# ffsll.m4 serial 4
dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -12,8 +12,26 @@ AC_DEFUN([gl_FUNC_FFSLL],
dnl Persuade glibc <string.h> and AIX <strings.h> to declare ffsll().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_FUNCS_ONCE([ffsll])
- if test $ac_cv_func_ffsll = yes; then
+ dnl We can't use AC_CHECK_FUNC here, because ffsll() is defined as a
+ dnl static inline function when compiling for Android 13 or older.
+ dnl But require that ffsll() is declared; otherwise we may be using
+ dnl the GCC built-in function, which leads to warnings
+ dnl "warning: implicit declaration of function 'ffsll'".
+ AC_CACHE_CHECK([for ffsll], [gl_cv_func_ffsll],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ #include <strings.h>
+ long long x;
+ ]],
+ [[int (*func) (long long) = ffsll;
+ return func (x);
+ ]])
+ ],
+ [gl_cv_func_ffsll=yes],
+ [gl_cv_func_ffsll=no])
+ ])
+ if test $gl_cv_func_ffsll = yes; then
dnl Test whether ffsll works.
dnl On AIX 7.2 in 32-bit mode it is completely broken.
AC_CACHE_CHECK([whether ffsll works],
--
2.34.1
