| 1 | #
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| 2 | # This is a collection of useful autoconf macros
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| 3 | #
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| 4 |
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| 5 | ############################################
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| 6 | # Check if the compiler handles c99 struct initialization, and if not try -AC99 and -c99 flags
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| 7 | # Usage: LIBREPLACE_C99_STRUCT_INIT(success-action,failure-action)
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| 8 | # changes CFLAGS to add -AC99 or -c99 if needed
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| 9 | AC_DEFUN([LIBREPLACE_C99_STRUCT_INIT],
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| 10 | [
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| 11 | saved_CFLAGS="$CFLAGS";
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| 12 | c99_init=no
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| 13 | if test x"$c99_init" = x"no"; then
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| 14 | AC_MSG_CHECKING(for C99 designated initializers)
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| 15 | CFLAGS="$saved_CFLAGS";
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| 16 | AC_TRY_COMPILE([#include <stdio.h>],
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| 17 | [ struct foo {int x;char y;};
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| 18 | struct foo bar = { .y = 'X', .x = 1 };
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| 19 | ],
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| 20 | [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
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| 21 | fi
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| 22 | if test x"$c99_init" = x"no"; then
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| 23 | AC_MSG_CHECKING(for C99 designated initializers with -AC99)
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| 24 | CFLAGS="$saved_CFLAGS -AC99";
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| 25 | AC_TRY_COMPILE([#include <stdio.h>],
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| 26 | [ struct foo {int x;char y;};
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| 27 | struct foo bar = { .y = 'X', .x = 1 };
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| 28 | ],
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| 29 | [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
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| 30 | fi
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| 31 | if test x"$c99_init" = x"no"; then
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| 32 | AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=extc99)
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| 33 | CFLAGS="$saved_CFLAGS -qlanglvl=extc99";
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| 34 | AC_TRY_COMPILE([#include <stdio.h>],
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| 35 | [ struct foo {int x;char y;};
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| 36 | struct foo bar = { .y = 'X', .x = 1 };
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| 37 | ],
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| 38 | [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
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| 39 | fi
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| 40 | if test x"$c99_init" = x"no"; then
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| 41 | AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=stdc99)
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| 42 | CFLAGS="$saved_CFLAGS -qlanglvl=stdc99";
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| 43 | AC_TRY_COMPILE([#include <stdio.h>],
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| 44 | [ struct foo {int x;char y;};
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| 45 | struct foo bar = { .y = 'X', .x = 1 };
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| 46 | ],
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| 47 | [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
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| 48 | fi
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| 49 | if test x"$c99_init" = x"no"; then
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| 50 | AC_MSG_CHECKING(for C99 designated initializers with -c99)
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| 51 | CFLAGS="$saved_CFLAGS -c99"
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| 52 | AC_TRY_COMPILE([#include <stdio.h>],
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| 53 | [ struct foo {int x;char y;};
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| 54 | struct foo bar = { .y = 'X', .x = 1 };
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| 55 | ],
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| 56 | [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
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