[tlbuild] Bug in libpng affecting Solaris 10

[Nelson H. F. Beebe]

Karl kindly posted the recipe "gcc ... -E -dD -o /tmp/foo ..." to
trace definitions as they are made during compilation.

Several years ago, I wrote the script below to display the predefined
symbols for assorted compilers; I've found it particularly handy in
porting code to new platforms where it is sometimes necessary to
provide preprocessor-wrapped code fragments specific to particular
systems:

% cat /usr/uumath/share/bin/cc-defs
#! /bin/sh -
### ====================================================================
### Display a sorted list of preprocessor macros known to specified
### C/C++/C# compiler(s) (default: gcc):
###
### Usage:
###	cc-defs
###	cc-defs compiler1 compiler2 ...
###
### Compiler families known to work with this script:
###	cscc gcc lcc mcc mgcc nvcc opencc pathcc pgcc suncc winegcc
###
### Compiler families known NOT to work with this script:
###	gmcs	[no preprocessor support]
###	mcs	[no preprocessor support]
###	tcc	[no way to display preprocessor options]
###
### [16-Jun-2009]
### ====================================================================

IFS='
 	'

banner=no
test $# -gt 1 && banner=yes
test $# -lt 1 && set -- gcc

for compiler in "$@"
do
	CC=${1-gcc}

	test "$banner" = yes && echo ==================== CC = $CC

	## NB: on tr command, use '\012' instead of '\n', so that this
	## also works on Minix

	case "$CC" in

	cc | c89 | c99 | CC | DCC | NCC | OCC )
		## NB: display from -# option is on stderr, not stdout, so redirect stderr to stdout
		## The awk filter is needed for Minux, which quotes some definitions
		EMPTY=/tmp/empty-$$.c
		touch $EMPTY
		$CC -v -E $EMPTY < /dev/null 2>&1 |
			grep -v '^ *#' |
				tr ' ' '\012' |
					awk '/^".*"/ {print substr($0,2,length($0)-2)} { print }' |
						egrep -e '^-D' |
							env LC_ALL=C sort -u
		rm -f $EMPTY
		;;

	*nvcc* )
		EMPTY=/tmp/empty-$$.c
		touch $EMPTY
		$CC -v -E $EMPTY < /dev/null 2>&1 |
			sed -e 's/^#[$] //' |
				tr ' ' '\012' |
					egrep -e '^-D' |
						env LC_ALL=C sort -u
		rm -f $EMPTY
		echo NB: $CC then invokes gcc
		;;


	*solCC* | *sunCC* | *lcc* )
		## NB: display from -# option is on stderr, not stdout, so redirect stderr to stdout
		EMPTY=/tmp/empty-$$.c
		touch $EMPTY
		$CC -v -E $EMPTY < /dev/null 2>&1 |
			grep -v '^ *#' |
				tr ' ' '\012' |
					egrep -e '^-D' |
						env LC_ALL=C sort -u
		rm -f $EMPTY
		;;

	*sol* | *sun* )
		## NB: display from -# option is on stderr, not stdout, so redirect stderr to stdout
		$CC -# -E -- - < /dev/null 2>&1 |
			grep -v '^ *#' |
				tr ' ' '\012' |
					egrep -e '^-D' |
						env LC_ALL=C sort -u
		;;

	*)
		## gcc, pathcc, pgcc, opencc recognize -dM option
		## pgcc needs --, but gcc complains about it, so redirect complaints
		## to /dev/null

		( $CC -dM -E    - < /dev/null 2>/dev/null || \
		  $CC -dM -E -- - < /dev/null 2>/dev/null ) | env LC_ALL=C sort -u
		;;

	esac

	shift
done

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe at math.utah.edu  -
- 155 S 1400 E RM 233                       beebe at acm.org  beebe at computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
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