Avoid compilation error due to 'mmap' on Android

[Bruno Haible]

Compiling for Android 4.3, I see a couple of compilation errors, such as

zerosize-ptr.h:59:13: error: call to 'mmap' declared with attribute error: mmap is not available with _FILE_OFFSET_BITS=64 when using GCC until android-21. Either raise your minSdkVersion, disable _FILE_OFFSET_BITS=64, or switch to Clang.

This patch avoids the errors.


2018-05-13 Bruno Haible <***@clisp.org>

Avoid compilation error due to 'mmap' on Android.
* lib/vma-iter.c (_FILE_OFFSET_BITS): Undefine on Android.
* lib/get-rusage-as.c (_FILE_OFFSET_BITS): Likewise.
* tests/zerosize-ptr.h (_FILE_OFFSET_BITS, __USE_FILE_OFFSET64):
Undefine on Android.

diff --git a/lib/get-rusage-as.c b/lib/get-rusage-as.c
index 096d3d1..e3c3dfd 100644
--- a/lib/get-rusage-as.c
+++ b/lib/get-rusage-as.c
@@ -17,6 +17,18 @@

#include <config.h>

+/* On Android, when targeting Android 4.4 or older with a GCC toolchain,
+ prevent a compilation error
+ "error: call to 'mmap' declared with attribute error: mmap is not
+ available with _FILE_OFFSET_BITS=64 when using GCC until android-21.
+ Either raise your minSdkVersion, disable _FILE_OFFSET_BITS=64, or
+ switch to Clang."
+ The files that we access in this compilation unit are less than 2 GB
+ large. */
+#if defined __ANDROID__
+# undef _FILE_OFFSET_BITS
+#endif
+
/* Specification. */
#include "resource-ext.h"

diff --git a/lib/vma-iter.c b/lib/vma-iter.c
index b98b041..30d19a5 100644
--- a/lib/vma-iter.c
+++ b/lib/vma-iter.c
@@ -20,9 +20,15 @@
/* On Solaris in 32-bit mode, when gnulib module 'largefile' is in use,
prevent a compilation error
"Cannot use procfs in the large file compilation environment"
+ On Android, when targeting Android 4.4 or older with a GCC toolchain,
+ prevent a compilation error
+ "error: call to 'mmap' declared with attribute error: mmap is not
+ available with _FILE_OFFSET_BITS=64 when using GCC until android-21.
+ Either raise your minSdkVersion, disable _FILE_OFFSET_BITS=64, or
+ switch to Clang."
The files that we access in this compilation unit are less than 2 GB
large. */
-#if defined __sun
+#if defined __sun || defined __ANDROID__
# undef _FILE_OFFSET_BITS
#endif

diff --git a/tests/zerosize-ptr.h b/tests/zerosize-ptr.h
index e4867e9..d5592c5 100644
--- a/tests/zerosize-ptr.h
+++ b/tests/zerosize-ptr.h
@@ -18,6 +18,19 @@
argument. Therefore this file produces a non-NULL pointer which cannot
be dereferenced, if possible. */

+/* On Android, when targeting Android 4.4 or older with a GCC toolchain,
+ prevent a compilation error
+ "error: call to 'mmap' declared with attribute error: mmap is not
+ available with _FILE_OFFSET_BITS=64 when using GCC until android-21.
+ Either raise your minSdkVersion, disable _FILE_OFFSET_BITS=64, or
+ switch to Clang."
+ The files that we access in this compilation unit are less than 2 GB
+ large. */
+#if defined __ANDROID__
+# undef _FILE_OFFSET_BITS
+# undef __USE_FILE_OFFSET64
+#endif
+
#include <stdlib.h>

/* Test whether mmap() and mprotect() are available.