configure: drop AM_PROG_CC_C_O autoconf check

This macro is obsolete since automake 1.14 (2013). It might have been
unnecessary even before, in practice only gcc/clang are supported
compilers.

[1] https://www.gnu.org/software/automake/manual/html_node/Public-Macros.html#index-AM_005fPROG_005fCC_005fC_005fO
[2] https://lists.gnu.org/archive/html/info-gnu/2013-06/msg00009.html

Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/configure.ac b/configure.ac
index baec66978847bafee6308955954d28780db73ba7..0f763a793b84603d4b4c1600a2e193bcf8f82884 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -47,7 +47,6 @@ fi
 
 AM_PROG_AR
 LT_INIT([disable-static])
-AM_PROG_CC_C_O
 AC_EXEEXT
 CHECK_GCC_FVISIBILITY