commit a977b84

python: Probe for preadv2 and pwritev2

musl older than 1.2.5 doesn't implement these functions.

1@@ -12,6 +12,8 @@ cflags{
2 }
3 
4 build('cat', '$outdir/pyconfig.h', {
5+	'$builddir/probe/HAVE_PREADV2',
6+	'$builddir/probe/HAVE_PWRITEV2',
7 	'$builddir/probe/HAVE_STATX',
8 	'$dir/pyconfig.h',
9 })

 1@@ -326,7 +326,7 @@
 2 #define HAVE_PPOLL 1
 3 #define HAVE_PREAD 1
 4 #define HAVE_PREADV 1
 5-#define HAVE_PREADV2 1
 6+/* probe HAVE_PREADV2 */
 7 #define HAVE_PRLIMIT 1
 8 /* #undef HAVE_PROCESS_H */
 9 #define HAVE_PROCESS_VM_READV 1
10@@ -351,7 +351,7 @@
11 #define HAVE_PTY_H 1
12 #define HAVE_PWRITE 1
13 #define HAVE_PWRITEV 1
14-#define HAVE_PWRITEV2 1
15+/* probe HAVE_PWRITEV2 */
16 /* #undef HAVE_READLINE_READLINE_H */
17 #define HAVE_READLINK 1
18 #define HAVE_READLINKAT 1

1@@ -0,0 +1,5 @@
2+#define _GNU_SOURCE
3+#include <sys/uio.h>
4+int main(void) {
5+	return preadv2(0, 0, 0, -1, 0) != 0;
6+}

1@@ -0,0 +1,5 @@
2+#define _GNU_SOURCE
3+#include <sys/uio.h>
4+int main(void) {
5+	return pwritev2(1, 0, 0, -1, 0) != 0;
6+}

1@@ -6,6 +6,8 @@ probe('HAVE_EMMINTRIN_H')
2 probe('HAVE_IMMINTRIN_H')
3 probe('HAVE_INLINE_ASM')
4 probe('HAVE_MMINTRIN_H')
5+probe('HAVE_PREADV2')
6+probe('HAVE_PWRITEV2')
7 probe('HAVE_STATX')
8 probe('HAVE__MM_CLMULEPI64_SI128')
9 probe('HAVE__MM_MOVEMASK_EPI8')