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configure.in: clang check

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* configure.in: should not use AC_COMPILE_IFELSE before
  AC_USE_SYSTEM_EXTENSIONS.  [Bug #8192]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40031 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2013-04-01 05:41:27 +00:00
parent 90e8a9b4bd
commit 3962655994
1 changed files with 5 additions and 4 deletions
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9
configure.in
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@ -396,12 +396,13 @@ AS_CASE(["$host_os:$build_os"],
# clang version 1.0 (http://llvm.org/svn/llvm-project/cfe/tags/Apple/clang-23 exported)
# Apple clang version 2.0 (tags/Apple/clang-137) (based on LLVM 2.9svn)
# Apple clang version 2.1 (tags/Apple/clang-163.7.1) (based on LLVM 3.0svn)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
if ! $CC -E -xc - <<SRC >/dev/null; then
@%:@if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
@%:@error premature clang
@%:@endif])],
[],
[AC_MSG_ERROR([clang version 3.0 or later is required])])
@%:@endif
SRC
AC_MSG_ERROR([clang version 3.0 or later is required])
fi
])
if test x"${build}" != x"${host}"; then
AC_CHECK_TOOL(CC, gcc)