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configure.ac: fix for upcoming autoconf-2.70

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The failure initially noticed on `autoconf-2.69d` (soon to become 2.70):

```
$ ./configure
./configure: line 8720: syntax error near unexpected token `fi'
./configure: line 8720: `fi'
```

Before the change generated `./configure ` snippet looked like:

```
    if ! $CC -E -xc - <<SRC >/dev/null
then :

	#if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
	#error premature clang
	#endif
SRC
	as_fn_error $? "clang version 3.0 or later is required" "$LINENO" 5
fi
```

Note the newline that breaks here-document syntax.

After the change the snippet does not use here-document.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
This commit is contained in:
Sergei Trofimovich 2020-11-16 08:42:15 +00:00 • committed by Nobuyoshi Nakada
parent ef19fb111a
commit fcc88da5eb
Notes: git 2020-11-17 09:42:23 +09:00
1 changed files with 8 additions and 7 deletions
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15
configure.ac
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@ -271,13 +271,14 @@ 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)
AS_IF([! $CC -E -xc - <<SRC >/dev/null], [
@%:@if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
@%:@error premature clang
@%:@endif
SRC
AC_MSG_ERROR([clang version 3.0 or later is required])
])
AC_PREPROC_IFELSE(
[AC_LANG_PROGRAM([
@%:@if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
@%:@error premature clang
@%:@endif
])],
[],
[AC_MSG_ERROR([clang version 3.0 or later is required])])
])
AS_CASE(["$target_os"],