318 lines
11 KiB
Plaintext
318 lines
11 KiB
Plaintext
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# IJG auto-configuration source file.
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# Process this file with autoconf to produce a configure script.
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#
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# Configure script for IJG libjpeg
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#
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AC_INIT([libjpeg], [7.0])
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# Directory where autotools helper scripts lives.
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AC_CONFIG_AUX_DIR([.])
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# Generate configuration headers.
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AC_CONFIG_HEADERS([jconfig.h:jconfig.cfg])
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# Hack: disable autoheader so that it doesn't overwrite our cfg template.
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AUTOHEADER="echo autoheader ignored"
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# Check system type
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AC_CANONICAL_TARGET
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# Initialize Automake
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# Don't require all the GNU mandated files
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AM_INIT_AUTOMAKE([-Wall -Werror ansi2knr no-dist foreign])
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# Make --enable-silent-rules the default.
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# To get verbose build output you may configure
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# with --disable-silent-rules or use "make V=1".
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AM_SILENT_RULES([yes])
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# This is required when using the de-ANSI-fication feature.
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AM_C_PROTOTYPES
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# Add configure option --enable-maintainer-mode which enables
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# dependency checking and generation useful to package maintainers.
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# This is made an option to avoid confusing end users.
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AM_MAINTAINER_MODE
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# Check for programs
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AC_PROG_CC
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AC_PROG_CC_STDC
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AC_PROG_CPP
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AC_PROG_INSTALL
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AC_PROG_MAKE_SET
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AC_PROG_LN_S
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# Check if LD supports linker scripts,
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# and define automake conditional HAVE_LD_VERSION_SCRIPT if so.
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AC_ARG_ENABLE([ld-version-script],
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AS_HELP_STRING([--enable-ld-version-script],
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[enable linker version script (default is enabled when possible)]),
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[have_ld_version_script=$enableval], [])
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if test -z "$have_ld_version_script"; then
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AC_MSG_CHECKING([if LD -Wl,--version-script works])
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save_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
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cat > conftest.map <<EOF
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VERS_1 {
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global: sym;
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};
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VERS_2 {
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global: sym;
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} VERS_1;
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EOF
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AC_LINK_IFELSE(AC_LANG_PROGRAM([], []),
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[have_ld_version_script=yes], [have_ld_version_script=no])
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rm -f conftest.map
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LDFLAGS="$save_LDFLAGS"
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AC_MSG_RESULT($have_ld_version_script)
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fi
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AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
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# See if compiler supports prototypes.
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AC_MSG_CHECKING(for function prototypes)
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AC_CACHE_VAL(ijg_cv_have_prototypes,
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[AC_TRY_COMPILE([
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int testfunction (int arg1, int * arg2); /* check prototypes */
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struct methods_struct { /* check method-pointer declarations */
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int (*error_exit) (char *msgtext);
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int (*trace_message) (char *msgtext);
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int (*another_method) (void);
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};
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int testfunction (int arg1, int * arg2) /* check definitions */
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{ return arg2[arg1]; }
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int test2function (void) /* check void arg list */
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{ return 0; }
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], [ ], ijg_cv_have_prototypes=yes, ijg_cv_have_prototypes=no)])
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AC_MSG_RESULT($ijg_cv_have_prototypes)
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if test $ijg_cv_have_prototypes = yes; then
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AC_DEFINE([HAVE_PROTOTYPES],[1],[Compiler supports function prototypes.])
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else
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echo Your compiler does not seem to know about function prototypes.
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echo Perhaps it needs a special switch to enable ANSI C mode.
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echo If so, we recommend running configure like this:
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echo " ./configure CC='cc -switch'"
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echo where -switch is the proper switch.
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fi
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# Check header files
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AC_CHECK_HEADERS(stddef.h stdlib.h locale.h)
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AC_CHECK_HEADER(string.h, , AC_DEFINE([NEED_BSD_STRINGS],[1],[Compiler has <strings.h> rather than standard <string.h>.]))
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# See whether type size_t is defined in any ANSI-standard places;
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# if not, perhaps it is defined in <sys/types.h>.
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AC_MSG_CHECKING(for size_t)
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AC_TRY_COMPILE([
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#ifdef HAVE_STDDEF_H
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#include <stddef.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <stdio.h>
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#ifdef NEED_BSD_STRINGS
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#include <strings.h>
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#else
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#include <string.h>
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#endif
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typedef size_t my_size_t;
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], [ my_size_t foovar; ], ijg_size_t_ok=yes,
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[ijg_size_t_ok="not ANSI, perhaps it is in sys/types.h"])
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AC_MSG_RESULT($ijg_size_t_ok)
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if test "$ijg_size_t_ok" != yes; then
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AC_CHECK_HEADER(sys/types.h, [AC_DEFINE([NEED_SYS_TYPES_H],[1],[Need to include <sys/types.h> in order to obtain size_t.])
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AC_EGREP_CPP(size_t, [#include <sys/types.h>],
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[ijg_size_t_ok="size_t is in sys/types.h"], ijg_size_t_ok=no)],
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ijg_size_t_ok=no)
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AC_MSG_RESULT($ijg_size_t_ok)
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if test "$ijg_size_t_ok" = no; then
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echo Type size_t is not defined in any of the usual places.
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echo Try putting '"typedef unsigned int size_t;"' in jconfig.h.
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fi
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fi
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# Check compiler characteristics
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AC_MSG_CHECKING(for type unsigned char)
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AC_TRY_COMPILE(, [ unsigned char un_char; ],
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[AC_MSG_RESULT(yes)
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AC_DEFINE([HAVE_UNSIGNED_CHAR],[1],[Compiler supports 'unsigned char'.])], AC_MSG_RESULT(no))
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dnl
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AC_MSG_CHECKING(for type unsigned short)
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AC_TRY_COMPILE(, [ unsigned short un_short; ],
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[AC_MSG_RESULT(yes)
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AC_DEFINE([HAVE_UNSIGNED_SHORT],[1],[Compiler supports 'unsigned short'.])], AC_MSG_RESULT(no))
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dnl
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AC_MSG_CHECKING(for type void)
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AC_TRY_COMPILE([
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/* Caution: a C++ compiler will insist on valid prototypes */
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typedef void * void_ptr; /* check void * */
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#ifdef HAVE_PROTOTYPES /* check ptr to function returning void */
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typedef void (*void_func) (int a, int b);
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#else
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typedef void (*void_func) ();
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#endif
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#ifdef HAVE_PROTOTYPES /* check void function result */
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void test3function (void_ptr arg1, void_func arg2)
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#else
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void test3function (arg1, arg2)
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void_ptr arg1;
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void_func arg2;
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#endif
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{
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char * locptr = (char *) arg1; /* check casting to and from void * */
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arg1 = (void *) locptr;
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(*arg2) (1, 2); /* check call of fcn returning void */
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}
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], [ ], AC_MSG_RESULT(yes), [AC_MSG_RESULT(no)
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AC_DEFINE([void],[char],[Define 'void' as 'char' for archaic compilers that don't understand it.])])
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AC_C_CONST
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# Check for non-broken inline under various spellings
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AC_MSG_CHECKING(for inline)
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ijg_cv_inline=""
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AC_TRY_COMPILE(, [} __inline__ int foo() { return 0; }
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int bar() { return foo();], ijg_cv_inline="__inline__",
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AC_TRY_COMPILE(, [} __inline int foo() { return 0; }
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int bar() { return foo();], ijg_cv_inline="__inline",
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AC_TRY_COMPILE(, [} inline int foo() { return 0; }
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int bar() { return foo();], ijg_cv_inline="inline")))
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AC_MSG_RESULT($ijg_cv_inline)
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AC_DEFINE_UNQUOTED([INLINE],[$ijg_cv_inline],[How to obtain function inlining.])
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# We cannot check for bogus warnings, but at least we can check for errors
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AC_MSG_CHECKING(for broken incomplete types)
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AC_TRY_COMPILE([ typedef struct undefined_structure * undef_struct_ptr; ], ,
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AC_MSG_RESULT(ok),
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[AC_MSG_RESULT(broken)
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AC_DEFINE([INCOMPLETE_TYPES_BROKEN],[1],[Compiler does not support pointers to unspecified structures.])])
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# Test whether global names are unique to at least 15 chars
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AC_MSG_CHECKING(for short external names)
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AC_TRY_LINK([
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int possibly_duplicate_function () { return 0; }
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int possibly_dupli_function () { return 1; }
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], [ ], AC_MSG_RESULT(ok), [AC_MSG_RESULT(short)
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AC_DEFINE([NEED_SHORT_EXTERNAL_NAMES],[1],[Linker requires that global names be unique in first 15 characters.])])
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# Run-time checks
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AC_MSG_CHECKING(to see if char is signed)
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AC_TRY_RUN([
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#ifdef HAVE_PROTOTYPES
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int is_char_signed (int arg)
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#else
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int is_char_signed (arg)
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int arg;
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#endif
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{
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if (arg == 189) { /* expected result for unsigned char */
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return 0; /* type char is unsigned */
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}
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else if (arg != -67) { /* expected result for signed char */
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printf("Hmm, it seems 'char' is not eight bits wide on your machine.\n");
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printf("I fear the JPEG software will not work at all.\n\n");
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}
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return 1; /* assume char is signed otherwise */
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}
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char signed_char_check = (char) (-67);
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int main() {
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exit(is_char_signed((int) signed_char_check));
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}], [AC_MSG_RESULT(no)
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AC_DEFINE([CHAR_IS_UNSIGNED],[1],[Characters are unsigned])], AC_MSG_RESULT(yes),
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[echo Assuming that char is signed on target machine.
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echo If it is unsigned, this will be a little bit inefficient.
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])
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dnl
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AC_MSG_CHECKING(to see if right shift is signed)
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AC_TRY_RUN([
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#ifdef HAVE_PROTOTYPES
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int is_shifting_signed (long arg)
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#else
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int is_shifting_signed (arg)
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long arg;
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#endif
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/* See whether right-shift on a long is signed or not. */
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{
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long res = arg >> 4;
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if (res == -0x7F7E80CL) { /* expected result for signed shift */
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return 1; /* right shift is signed */
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}
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/* see if unsigned-shift hack will fix it. */
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/* we can't just test exact value since it depends on width of long... */
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res |= (~0L) << (32-4);
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if (res == -0x7F7E80CL) { /* expected result now? */
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return 0; /* right shift is unsigned */
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}
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printf("Right shift isn't acting as I expect it to.\n");
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printf("I fear the JPEG software will not work at all.\n\n");
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return 0; /* try it with unsigned anyway */
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}
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int main() {
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exit(is_shifting_signed(-0x7F7E80B1L));
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}], [AC_MSG_RESULT(no)
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AC_DEFINE([RIGHT_SHIFT_IS_UNSIGNED],[1],[Broken compiler shifts signed values as an unsigned shift.])], AC_MSG_RESULT(yes),
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AC_MSG_RESULT(Assuming that right shift is signed on target machine.))
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dnl
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AC_MSG_CHECKING(to see if fopen accepts b spec)
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AC_TRY_RUN([
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#include <stdio.h>
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int main() {
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if (fopen("conftestdata", "wb") != NULL)
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exit(0);
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exit(1);
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}], AC_MSG_RESULT(yes), [AC_MSG_RESULT(no)
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AC_DEFINE([DONT_USE_B_MODE],[1],[Don't open files in binary mode.])],
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AC_MSG_RESULT(Assuming that it does.))
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# Configure libtool
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AC_LIBTOOL_WIN32_DLL
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AC_PROG_LIBTOOL
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# Select memory manager depending on user input.
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# If no "-enable-maxmem", use jmemnobs
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MEMORYMGR='jmemnobs'
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MAXMEM="no"
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AC_ARG_ENABLE(maxmem,
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[ --enable-maxmem[=N] enable use of temp files, set max mem usage to N MB],
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MAXMEM="$enableval")
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dnl [# support --with-maxmem for backwards compatibility with IJG V5.]
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dnl AC_ARG_WITH(maxmem, , MAXMEM="$withval")
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if test "x$MAXMEM" = xyes; then
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MAXMEM=1
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fi
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if test "x$MAXMEM" != xno; then
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if test -n "`echo $MAXMEM | sed 's/[[0-9]]//g'`"; then
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AC_MSG_ERROR(non-numeric argument to --enable-maxmem)
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fi
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DEFAULTMAXMEM=`expr $MAXMEM \* 1048576`
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AC_DEFINE_UNQUOTED([DEFAULT_MAX_MEM], [${DEFAULTMAXMEM}], [Maximum data space library will allocate.])
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AC_MSG_CHECKING([for 'tmpfile()'])
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AC_TRY_LINK([#include <stdio.h>], [ FILE * tfile = tmpfile(); ],
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[AC_MSG_RESULT(yes)
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MEMORYMGR='jmemansi'],
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[AC_MSG_RESULT(no)
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dnl if tmpfile is not present, must use jmemname.
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MEMORYMGR='jmemname'
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# Test for the need to remove temporary files using a signal handler (for cjpeg/djpeg)
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AC_DEFINE([NEED_SIGNAL_CATCHER],[1],[Need signal handler to clean up temporary files.])
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AC_MSG_CHECKING([for 'mktemp()'])
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AC_TRY_LINK(, [ char fname[80]; mktemp(fname); ], AC_MSG_RESULT(yes),
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[AC_MSG_RESULT(no)
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AC_DEFINE([NO_MKTEMP],[1],[The mktemp() function is not available.])])])
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fi
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AC_SUBST(MEMORYMGR)
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# Extract the library version ID from jpeglib.h.
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AC_MSG_CHECKING([libjpeg version number])
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[JPEG_LIB_VERSION=`sed -e '/^#define JPEG_LIB_VERSION/!d' -e 's/^[^0-9]*\([0-9][0-9]*\).*$/\1/' $srcdir/jpeglib.h`]
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[JPEG_LIB_VERSION="`expr $JPEG_LIB_VERSION / 10`:`expr $JPEG_LIB_VERSION % 10`"]
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AC_MSG_RESULT([$JPEG_LIB_VERSION])
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AC_SUBST([JPEG_LIB_VERSION])
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AC_CONFIG_FILES([Makefile])
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AC_OUTPUT
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