[SCM] GNU Autoconf source repository branch, master, updated. v2.69-158-g739cdc8

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 739cdc82b5325402231f3f5e1a38f681fcbd1db2
Author: Paul Eggert <***@cs.ucla.edu>
Date: Tue Mar 15 09:34:11 2016 -0700

Also try clang

Problem reported by Václav Zeman in:
http://lists.gnu.org/archive/html/autoconf/2012-10/msg00000.html
* lib/autoconf/c.m4 (AC_PROG_CC, AC_PROG_OBJC): Also try clang.
(AC_PROG_CXX): Also try clang++.
These are at the end of the existing lists, to avoid compatibility
issues in older installations.

-----------------------------------------------------------------------

Summary of changes:
lib/autoconf/c.m4 | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index 933955f..9a9fbd3 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -457,6 +457,9 @@ fi
if test -z "$CC"; then
AC_CHECK_TOOLS(CC, cl.exe)
fi
+if test -z "$CC"; then
+ AC_CHECK_TOOL(CC, clang)
+fi
])

test -z "$CC" && AC_MSG_FAILURE([no acceptable C compiler found in \$PATH])
@@ -704,7 +707,7 @@ if test -z "$CXX"; then
else
AC_CHECK_TOOLS(CXX,
[m4_default([$1],
- [g++ c++ gpp aCC CC cxx cc++ cl.exe FCC KCC RCC xlC_r xlC])],
+ [g++ c++ gpp aCC CC cxx cc++ cl.exe FCC KCC RCC xlC_r xlC clang++])],
g++)
fi
fi
@@ -883,7 +886,7 @@ _AC_ARG_VAR_LIBS()dnl
_AC_ARG_VAR_CPPFLAGS()dnl
_AC_ARG_VAR_PRECIOUS([OBJC])dnl
AC_CHECK_TOOLS(OBJC,
- [m4_default([$1], [gcc objcc objc cc CC])],
+ [m4_default([$1], [gcc objcc objc cc CC clang])],
gcc)
# Provide some information about the compiler.
_AS_ECHO_LOG([checking for _AC_LANG compiler version])


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