minor tidy-up to configury.

configure

@@ -11161,7 +11161,6 @@ LT_MAJOR=0
 LT_REVISION=$INTERFACE_AGE
 LT_AGE=`expr $BINARY_AGE - $INTERFACE_AGE`
 LT_CURRENT=`expr $LT_MAJOR + $LT_AGE`
-
 LT_EXTRA=""
 
 
@@ -11171,6 +11170,8 @@ LT_EXTRA=""
 
 
 
+
+
 printf "%s\n" "#define SDL_BUILD_MAJOR_VERSION $MAJOR_VERSION" >>confdefs.h
 
 
@@ -14581,11 +14582,11 @@ else $as_nop
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:14584: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:14585: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:14588: \$? = $ac_status" >&5
+   echo "$as_me:14589: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -14682,11 +14683,11 @@ else $as_nop
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:14685: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:14686: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:14689: \$? = $ac_status" >&5
+   echo "$as_me:14690: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -14735,11 +14736,11 @@ else $as_nop
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:14738: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:14739: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:14742: \$? = $ac_status" >&5
+   echo "$as_me:14743: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -16203,90 +16204,6 @@ CPPFLAGS="$CPPFLAGS $EXTRA_CFLAGS"
 CFLAGS="$CFLAGS $EXTRA_CFLAGS"
 LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for an ANSI C-conforming const" >&5
-printf %s "checking for an ANSI C-conforming const... " >&6; }
-if test ${ac_cv_c_const+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-int
-main (void)
-{
-
-#ifndef __cplusplus
-  /* Ultrix mips cc rejects this sort of thing.  */
-  typedef int charset[2];
-  const charset cs = { 0, 0 };
-  /* SunOS 4.1.1 cc rejects this.  */
-  char const *const *pcpcc;
-  char **ppc;
-  /* NEC SVR4.0.2 mips cc rejects this.  */
-  struct point {int x, y;};
-  static struct point const zero = {0,0};
-  /* IBM XL C 1.02.0.0 rejects this.
-     It does not let you subtract one const X* pointer from another in
-     an arm of an if-expression whose if-part is not a constant
-     expression */
-  const char *g = "string";
-  pcpcc = &g + (g ? g-g : 0);
-  /* HPUX 7.0 cc rejects these. */
-  ++pcpcc;
-  ppc = (char**) pcpcc;
-  pcpcc = (char const *const *) ppc;
-  { /* SCO 3.2v4 cc rejects this sort of thing.  */
-    char tx;
-    char *t = &tx;
-    char const *s = 0 ? (char *) 0 : (char const *) 0;
-
-    *t++ = 0;
-    if (s) return 0;
-  }
-  { /* Someone thinks the Sun supposedly-ANSI compiler will reject this.  */
-    int x[] = {25, 17};
-    const int *foo = &x[0];
-    ++foo;
-  }
-  { /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
-    typedef const int *iptr;
-    iptr p = 0;
-    ++p;
-  }
-  { /* IBM XL C 1.02.0.0 rejects this sort of thing, saying
-       "k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
-    struct s { int j; const int *ap[3]; } bx;
-    struct s *b = &bx; b->j = 5;
-  }
-  { /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
-    const int foo = 10;
-    if (!foo) return 0;
-  }
-  return !cs[0] && !zero.x;
-#endif
-
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"
-then :
-  ac_cv_c_const=yes
-else $as_nop
-  ac_cv_c_const=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_const" >&5
-printf "%s\n" "$ac_cv_c_const" >&6; }
-if test $ac_cv_c_const = no; then
-
-printf "%s\n" "#define const /**/" >>confdefs.h
-
-fi
-
-
 # Check whether --enable-dependency-tracking was given.
 if test ${enable_dependency_tracking+y}
 then :

configure.ac

@@ -7,7 +7,7 @@ m4_define([MINOR_VERSION_MACRO], [5])
 m4_define([MICRO_VERSION_MACRO], [1])
 
 AC_INIT([SDL2_mixer],
-        MAJOR_VERSION_MACRO.MINOR_VERSION_MACRO.MICRO_VERSION_MACRO,
+        [MAJOR_VERSION_MACRO.MINOR_VERSION_MACRO.MICRO_VERSION_MACRO],
         [https://github.com/libsdl-org/SDL_mixer/issues],
         [SDL2_mixer])
 AC_CONFIG_SRCDIR([src/mixer.c])
@@ -49,8 +49,8 @@ LT_MAJOR=0
 LT_REVISION=$INTERFACE_AGE
 LT_AGE=`expr $BINARY_AGE - $INTERFACE_AGE`
 LT_CURRENT=`expr $LT_MAJOR + $LT_AGE`
+LT_EXTRA=""
 
-LT_EXTRA="" dnl for OS2 dll name
 m4_pattern_allow([^LT_])
 
 AC_SUBST(LT_RELEASE)
@@ -124,9 +124,6 @@ CPPFLAGS="$CPPFLAGS $EXTRA_CFLAGS"
 CFLAGS="$CFLAGS $EXTRA_CFLAGS"
 LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"
 
-dnl Check for compiler characteristics
-AC_C_CONST
-
 dnl See whether we can use gcc style dependency tracking
 AC_ARG_ENABLE(dependency-tracking,
 [AS_HELP_STRING([--enable-dependency-tracking],