On Sat, Oct 13, 2001 at 09:07:54PM +0200, Guido Draheim wrote:
> make a macro (after AC_PROG_CC) that includes a check like
> TESTC99DECLARATIONS
> if notOK and test $GCC = yes ::
> save_CFLAGS="$CFLAGS"
> CFLAGS="$CFLAGS -std=gnu99"
> TESTC99DECLARATIONS
> if stillnotOK ::
> CFLAGS=save_CFLAGS ; echo BAD (or bail out)
> else
> echo "OK (with -std=gnu99)"
> fi
> else
> echo BAD (or bail out)
> fi
Is this stylistically acceptable?
define(TEST_C99_DECL, AC_TRY_COMPILE([],[
int x=0; x+=1; int y=0;
for (int z=0; z < 2; z++);
],[C99=yes],[C99=no]))
AC_MSG_CHECKING([whether $CC accepts C99 declarations])
TEST_C99_DECL
if test $C99 = no -a $GCC = yes; then
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -std=gnu99"
TEST_C99_DECL
if test $C99 = no; then
CFLAGS="$save_CFLAGS"
else
C99_COMMENT=', with -std=gnu99'
fi
fi
if test $C99 = yes; then
echo "yes$C99_COMMENT"
else
AC_MSG_RESULT(no)
AC_MSG_ERROR([
*** This package requires a C compiler with C99 support. Please
*** consider trying a recent release of GCC.])
] fi
fi
--
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