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build: m4/ax_emptyarray.m4: cleanup

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Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: David Sommerseth <davids@redhat.com>
Signed-off-by: David Sommerseth <davids@redhat.com>
This commit is contained in:
Alon Bar-Lev 2012-02-29 22:11:54 +02:00 committed by David Sommerseth
parent c5c3cef6d3
commit bdd80be1fe
1 changed files with 31 additions and 18 deletions
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49
m4/ax_emptyarray.m4
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@ -7,21 +7,34 @@ dnl
dnl @version
dnl @author James Yonan <jim@yonan.net>
AC_DEFUN([AX_EMPTY_ARRAY], [
AC_MSG_RESULT([checking for C compiler empty array support])
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[
struct { int foo; int bar[[0]]; } mystruct;
])], [
AC_DEFINE_UNQUOTED(EMPTY_ARRAY_SIZE, 0, [Dimension to use for empty array declaration])
], [
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[
struct { int foo; int bar[[]]; } mystruct;
])], [
AC_DEFINE_UNQUOTED(EMPTY_ARRAY_SIZE,, [Dimension to use for empty array declaration])
], [
AC_MSG_ERROR([C compiler is unable to creaty empty arrays])
])
])
]
)
AS_VAR_PUSHDEF([VAR],[ax_cv_c_empty_array])dnl
AC_CACHE_CHECK(
[for C compiler empty array size],
[VAR],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
,
[[
struct { int foo; int bar[0]; } mystruct;
]]
)],
[VAR=0],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
,
[[
struct { int foo; int bar[]; } mystruct;
]]
)],
[VAR=],
[AC_MSG_ERROR([C compiler is unable to creaty empty arrays])]
)]
)]
)dnl
AC_DEFINE_UNQUOTED(
[EMPTY_ARRAY_SIZE],
[$VAR],
[Dimension to use for empty array declaration]
)dnl
AS_VAR_POPDEF([VAR])dnl
])