[libpng16] Removed cc -E workround, corrected png_get_palette_max API Tested on SUN OS cc 5.9,

which demonstrates the tokenization problem previously avoided by using /lib/cpp.
Since all .dfn output is now protected in double quotes unless it is to be macro
substituted the fix should work everywhere.

ANNOUNCE

@@ -31,6 +31,10 @@ Version 1.6.1 [February 16, 2013]
     files. Back ported from libpng 1.7.
   Made sRGB check numbers consistent.
   Ported libpng 1.5 options.awk/dfn file handling to 1.6, fixed one bug.
+  Removed cc -E workround, corrected png_get_palette_max API Tested on SUN OS cc 5.9,
+    which demonstrates the tokenization problem previously avoided by using /lib/cpp.
+    Since all .dfn output is now protected in double quotes unless it is to be macro
+    substituted the fix should work everywhere.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CHANGES

@@ -4387,6 +4387,10 @@ Version 1.6.1 [February 16, 2013]
     files. Back ported from libpng 1.7.
   Made sRGB check numbers consistent.
   Ported libpng 1.5 options.awk/dfn file handling to 1.6, fixed one bug.
+  Removed cc -E workround, corrected png_get_palette_max API Tested on SUN OS cc 5.9,
+    which demonstrates the tokenization problem previously avoided by using /lib/cpp.
+    Since all .dfn output is now protected in double quotes unless it is to be macro
+    substituted the fix should work everywhere.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

configure.ac

@@ -53,8 +53,7 @@ AC_PROG_CC
 AM_PROG_AS
 LT_PATH_LD
 AC_PROG_CPP
-AC_CHECK_TOOL(SED, sed, :)
+AC_PROG_AWK
-AC_CHECK_TOOL(AWK, awk, :)
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
@@ -64,30 +63,23 @@ dnl compatible later version may be used
 LT_INIT([win32-dll])
 LT_PREREQ([2.4.2])
 
-# On Solaris 10 and 12 CPP gets set to cc -E, however this still
+# Some awks crash when confronted with pnglibconf.dfa, do a test run now
-# does some input parsing.  We need strict ANSI-C style tokenization,
+# to make sure this doesn't happen
-# check this:
+AC_MSG_CHECKING([that AWK works])
-AC_REQUIRE_CPP
+if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\
-AC_MSG_CHECKING([for a C preprocessor that does not parse its input])
+   ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
-AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])],
+   ${srcdir}/pngusr.dfa 1>&2
-   [DFNCPP="$CPP"],
+then
-   [  DFNCPP=""
+   AC_MSG_RESULT([ok])
-      sav_CPP="$CPP"
-      for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"
-      do
-         AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])],
-            [DFNCPP="$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)
+   AC_MSG_FAILURE([failed], 1)
 fi
 
+# This is a remnant of the old cc -E validation, where it may have been
+# necessary to use a different preprocessor for .dfn files
+DFNCPP="$CPP"
+AC_SUBST(DFNCPP)
+
 # -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
 # checks the compiler with a program that generates a warning), add the
 # following option to deal with this
@@ -115,7 +107,6 @@ AC_ARG_ENABLE(werror,
 
 # Checks for header files.
 AC_HEADER_STDC
-AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST

scripts/options.awk

@@ -30,7 +30,7 @@
 # are copied to the preprocessed file).
 
 BEGIN{
-   out="/dev/null"              # intermediate, preprocessed, file
+   out=""                       # intermediate, preprocessed, file
    pre=-1                       # preprocess (first line)
    version="libpng version unknown" # version information
    version_file=""              # where to find the version
@@ -79,7 +79,7 @@ BEGIN{
 }
 
 # The output file must be specified before any input:
-out == "/dev/null" {
+out == "" {
    print "out=output.file must be given on the command line"
    err = 1
    exit 1