configure.ac revision 411dcf5666383ad936676a6ba0c9535f46e199da 
1#                                               -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4AC_PREREQ([2.57])
5AC_INIT([libjpeg], [6.b])
6
7AM_INIT_AUTOMAKE([-Wall foreign dist-bzip2])
8
9# Always build with prototypes
10AC_DEFINE([HAVE_PROTOTYPES], 1, [Define if your compiler supports prototypes])
11# Don't use undefined types
12AC_DEFINE([INCOMPLETE_TYPES_BROKEN], 1, [Define if you want use complete types])
13
14# Checks for programs.
15AC_PROG_CPP
16AC_PROG_CC
17AC_PROG_CXX
18AC_PROG_INSTALL
19AC_PROG_LIBTOOL
20AC_PROG_LN_S
21
22# Checks for libraries.
23
24# Checks for header files.
25AC_HEADER_STDC
26AC_CHECK_HEADERS([stddef.h stdlib.h string.h])
27AC_CHECK_HEADER([sys/types.h], AC_DEFINE([NEED_SYS_TYPES_H], 1, [Define if you have sys/types.h]))
28
29# Checks for typedefs, structures, and compiler characteristics.
30AC_C_CONST
31AC_C_CHAR_UNSIGNED
32AC_C_INLINE
33AC_TYPE_SIZE_T
34AC_CHECK_TYPES([unsigned char, unsigned short])
35
36AC_MSG_CHECKING([if right shift is signed])
37AC_TRY_RUN(
38	[#include <stdio.h>
39	 int is_shifting_signed (long arg) {
40	 long res = arg >> 4;
41
42	 if (res == -0x7F7E80CL)
43		return 1; /* right shift is signed */
44
45	 /* see if unsigned-shift hack will fix it. */
46	 /* we can't just test exact value since it depends on width of long... */
47	 res |= (~0L) << (32-4);
48	 if (res == -0x7F7E80CL)
49		return 0; /* right shift is unsigned */
50
51	 printf("Right shift isn't acting as I expect it to.\n");
52	 printf("I fear the JPEG software will not work at all.\n\n");
53	 return 0; /* try it with unsigned anyway */
54	 }
55	 int main (void) {
56		exit(is_shifting_signed(-0x7F7E80B1L));
57	 }],
58	[AC_MSG_RESULT(no)
59	 AC_DEFINE([RIGHT_SHIFT_IS_UNSIGNED], 1, [Define if shift is unsigned])],
60	[AC_MSG_RESULT(yes)],
61	[AC_MSG_RESULT(Assuming that right shift is signed on target machine.)])
62
63# test whether global names are unique to at least 15 chars
64AC_MSG_CHECKING([for short external names])
65AC_TRY_LINK(
66	[int possibly_duplicate_function () { return 0; }
67	 int possibly_dupli_function () { return 1; }], [ ],
68	[AC_MSG_RESULT(ok)],
69	[AC_MSG_RESULT(short)
70	 AC_DEFINE([NEED_SHORT_EXTERNAL_NAMES], 1, [Define if you need short function names])])
71
72# Checks for library functions.
73AC_CHECK_FUNCS([memset memcpy], [],
74	[AC_DEFINE([NEED_BSD_STRINGS], 1,
75		   [Define if you have BSD-like bzero and bcopy])])
76
77# Set flags to indicate platform
78case "$host_os" in
79  cygwin* | mingw* | pw32* | interix*)
80    is_win32=1
81  ;;
82esac
83AM_CONDITIONAL([IS_WIN32], [test "x$is_win32" = "x1"])
84
85# Check if we're on a supported CPU
86AC_MSG_CHECKING([if we have SIMD optimisations for cpu type])
87case "$host_cpu" in
88  x86_64)
89    AC_MSG_RESULT([yes (x86_64)])
90    AC_PROG_NASM
91    simd_arch=x86_64
92  ;;
93  i*86 | x86 | ia32)
94    AC_MSG_RESULT([yes (i386)])
95    AC_PROG_NASM
96    simd_arch=i386
97  ;;
98  *)
99    AC_MSG_RESULT([no ("$host_cpu")])
100    AC_MSG_ERROR([CPU is not supported])
101  ;;
102esac
103
104AC_DEFINE([WITH_SIMD], [1], [Use accelerated SIMD routines.])
105
106AM_CONDITIONAL([SIMD_I386], [test "x$simd_arch" = "xi386"])
107AM_CONDITIONAL([SIMD_X86_64], [test "x$simd_arch" = "xx86_64"])
108
109# jconfig.h is the file we use, but we have another before that to
110# fool autoheader. the reason is that we include this header in our
111# API headers, which can screw things up for users of the lib.
112# jconfig.h is a minimal version that allows this package to be built
113AC_CONFIG_HEADERS([config.h])
114AC_CONFIG_HEADERS([jconfig.h])
115AC_CONFIG_FILES([Makefile simd/Makefile])
116AC_OUTPUT
117