| commit | 0e2eecedb12dd472c9a008748be6edd6ea68fa0e | |
| author | Paolo Bonzini <bonzini@gnu.org> | |
| Mon, 31 Oct 2016 17:08:07 +0000 (31 18:08 +0100) | ||
| committer | Eric Blake <eblake@redhat.com> | |
| Wed, 21 Dec 2016 14:32:45 +0000 (21 08:32 -0600) | ||
| tree | 13be775a0fb6f6e778f5d7658a00da8fdccc89ec | treesnapshot (tar.gz zip) |
| parent | c54beb85aa855ce2c817d4f7738748841bf6ad30 | commitdiff |
autoconf: prefer an unrolled loop for trivial AC_CHECK_HEADERS
An unrolled loop avoids the cost of spawning sed in AS_TR_SH and
AS_TR_CPP. Prefer it if there is nothing in the second and third
argument of AC_CHECK_HEADERS and the first argument is a literal.
* lib/autoconf/headers.m4 (AC_CHECK_HEADERS): Unroll loop if safe.
(_AC_CHECK_HEADERS): Move basic implementation here.
(AC_CHECK_INCLUDES_DEFAULT): Remove unnecessary arguments after the first.
Signed-off-by: Paolo Bonzini <bonzini@gnu.org>
Message-Id: <1477933688-4884-3-git-send-email-bonzini@gnu.org>
[eblake: perform AC_CHECK_HEADERS_ONCE changes separately, use
dnl to reduce generated blank lines]
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
An unrolled loop avoids the cost of spawning sed in AS_TR_SH and
AS_TR_CPP. Prefer it if there is nothing in the second and third
argument of AC_CHECK_HEADERS and the first argument is a literal.
* lib/autoconf/headers.m4 (AC_CHECK_HEADERS): Unroll loop if safe.
(_AC_CHECK_HEADERS): Move basic implementation here.
(AC_CHECK_INCLUDES_DEFAULT): Remove unnecessary arguments after the first.
Signed-off-by: Paolo Bonzini <bonzini@gnu.org>
Message-Id: <1477933688-4884-3-git-send-email-bonzini@gnu.org>
[eblake: perform AC_CHECK_HEADERS_ONCE changes separately, use
dnl to reduce generated blank lines]
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
| lib/autoconf/headers.m4 | diffblobblamehistory |