[devel] Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build

Added a make macro DFNCPP that is a CPP that will accept the tokens in
    a .dfn file and adds configure stuff to test for such a CPP.  ./configure
    should fail if one is not available.

ANNOUNCE

@@ -76,6 +76,10 @@ Version 1.5.1beta08 [January 22, 2011]
     to the manual. Removed the synopses from libpngpf.3 because they
     were out of date and no longer useful.  Better information can be
     obtained by reading the prototypes and comments in pngpriv.h
+  Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
+    Added a make macro DFNCPP that is a CPP that will accept the tokens in
+    a .dfn file and adds configure stuff to test for such a CPP.  ./configure
+    should fail if one is not available.
 
 Version 1.5.1rc01 [January 22, 2011]
 

CHANGES

@@ -3192,6 +3192,10 @@ Version 1.5.1beta08 [January 22, 2011]
     to the manual. Removed the synopses from libpngpf.3 because they
     were out of date and no longer useful.  Better information can be
     obtained by reading the prototypes and comments in pngpriv.h
+  Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
+    Added a make macro DFNCPP that is a CPP that will accept the tokens in
+    a .dfn file and adds configure stuff to test for such a CPP.  ./configure
+    should fail if one is not available.
 
 Version 1.5.1rc01 [January 22, 2011]
 

Makefile.am

@@ -81,6 +81,13 @@ CLEANFILES= dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing
 
+# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
+# other operating systems (NeXT?) the C preprocessor selected by configure
+# checks input tokens for validity - effectively it performs part of the ANSI-C
+# parsing - and therefore fails with the .df files.  configure.ac has special
+# checks for this and sets DFNCPP appropriately.
+DFNCPP = @DFNCPP@
+
 SUFFIXES = .chk .dfn .out
 
 $(PNGLIB_BASENAME).pc: libpng.pc
@@ -119,7 +126,7 @@ SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
 	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
 	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
 	    dfn1.out >dfn2.out

configure.ac

@@ -34,6 +34,7 @@ AC_CONFIG_SRCDIR([pngget.c])
 AM_CONFIG_HEADER(config.h)
 
 # Checks for programs.
+AC_LANG([C])
 AC_PROG_CC
 AC_PROG_LD
 AC_PROG_CPP
@@ -44,6 +45,28 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 LT_INIT([win32-dll])
 
+# On Solaris 10 and 12 CPP gets set to cc -E, however this still
+# does some input parsing.  We need strict ANSI-C style tokenization,
+# check this:
+AC_REQUIRE_CPP
+AC_MSG_CHECKING([for a C preprocessor that does not parse its input])
+AC_TRY_CPP([1.5.0 16BIT],
+   [DFNCPP="$CPP"],
+   [DFNCPP=""
+   sav_CPP="$CPP"
+   for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"; do
+      AC_TRY_CPP([1.5.0 16BIT],
+         [DFNCPP="$CPP"]
+         [break],,)
+   done
+   CPP="$sav_CPP"])
+if test -n "$DFNCPP"; then
+   AC_MSG_RESULT([$DFNCPP])
+   AC_SUBST(DFNCPP)
+else
+   AC_MSG_FAILURE([not found], 1)
+fi
+
 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])
@@ -76,7 +99,7 @@ AC_MSG_CHECKING([if libraries can be versioned])
 # support for version-script, but doesn't actually
 # DO anything with it.
 case $host in
-*cygwin* | *mingw32* )
+*cygwin* | *mingw32* | *interix* )
     have_ld_version_script=no
     AC_MSG_RESULT(no)
 ;;

png.h

@@ -2232,7 +2232,8 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
  */
 
 /* The last ordinal number (this is the *last* one already used; the next
- * one to use is one more than this.)
+ * one to use is one more than this.)  Maintainer, remember to add an entry to
+ * scripts/symbols.def as well.
  */
 #ifdef PNG_EXPORT_LAST_ORDINAL
   PNG_EXPORT_LAST_ORDINAL(216);