OpenWrt – Blame information for rev 4

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Rev Author Line No. Line
4 office 1 dnl as-compiler-flag.m4 0.1.0
2  
3 dnl autostars m4 macro for detection of compiler flags
4  
5 dnl David Schleef <ds@schleef.org>
6  
7 dnl $Id: as-compiler-flag.m4,v 1.1 2005/12/15 23:35:19 ds Exp $
8  
9 dnl AS_COMPILER_FLAG(CFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED])
10 dnl Tries to compile with the given CFLAGS.
11 dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags,
12 dnl and ACTION-IF-NOT-ACCEPTED otherwise.
13  
14 AC_DEFUN([AS_COMPILER_FLAG],
15 [
16 AC_MSG_CHECKING([to see if compiler understands $1])
17  
18 save_CFLAGS="$CFLAGS"
19 CFLAGS="$CFLAGS $1"
20  
21 AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
22 CFLAGS="$save_CFLAGS"
23  
24 if test "X$flag_ok" = Xyes ; then
25 m4_ifvaln([$2],[$2])
26 true
27 else
28 m4_ifvaln([$3],[$3])
29 true
30 fi
31 AC_MSG_RESULT([$flag_ok])
32 ])
33  
34 dnl AS_COMPILER_FLAGS(VAR, FLAGS)
35 dnl Tries to compile with the given CFLAGS.
36  
37 AC_DEFUN([AS_COMPILER_FLAGS],
38 [
39 list=$2
40 flags_supported=""
41 flags_unsupported=""
42 AC_MSG_CHECKING([for supported compiler flags])
43 for each in $list
44 do
45 save_CFLAGS="$CFLAGS"
46 CFLAGS="$CFLAGS $each"
47 AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
48 CFLAGS="$save_CFLAGS"
49  
50 if test "X$flag_ok" = Xyes ; then
51 flags_supported="$flags_supported $each"
52 else
53 flags_unsupported="$flags_unsupported $each"
54 fi
55 done
56 AC_MSG_RESULT([$flags_supported])
57 if test "X$flags_unsupported" != X ; then
58 AC_MSG_WARN([unsupported compiler flags: $flags_unsupported])
59 fi
60 $1="$$1 $flags_supported"
61 ])
62