#! /bin/bash
# $Id$

#renice +19 -p $$; ionice -c3 -p $$
renice +10 -p $$; ionice -c3 -p $$

# Do not use for ctags - it would override $PATH:
# PS1=x; . ~/.bashrc
function ctags {(unset ctags; PS1=x; . ~/.bashrc; ctags; );}

customss="--enable-static --disable-shared"
customm="-m64"
target=
targets=
configure="./configure"
# >=4.7 has small macros section.
if gcc --version|perl -ne 'exit(!(/(\d+)\.(\d+)/&&($1>4||($1==4&&$2>=7))));';then
  debug="-g3"
else
  debug="-g2"
fi
asan=""
#asan="-fsanitize=address -static-libasan"
mcheck=""
#mcheck="-lmcheck"
fast=false
readline=""
disablebinutils="--disable-binutils --disable-gas --disable-gold --disable-gprof --disable-ld"

while true
do
	if [ "$1" = "--origss" ];then
		customss=
		shift
		continue
	fi
	if [ "$1" = "--fast" ];then
		fast=true
		shift
		continue
	fi
	if [ "$1" = "--shared" ];then
		customss="--disable-static --enable-shared"
		shift
		continue
	fi

	if [ "$1" = "-m" ];then
		customm=
		shift
		continue
	fi
	if [ "$1" = "-m32" ];then
		customm=-m32
		case `uname -m` in
		  i?86|x86_64|ia64) target=i386-unknown-linux-gnu ;;
		  ppc*)             target=powerpc64-unknown-linux-gnu ;;
		  s390*)            target=s390-unknown-linux-gnu ;;
		esac
		shift
		continue
	fi

	if [ "${1#*/configure}" != "$1" ];then
		configure="$1"
		shift
		continue
	fi

	if [ "$1" = "-s" ];then
		# -O0 is important to override GCC -O2.
		debug="-O0 -s"
		shift
		continue
	fi

	if [ "$1" = "--asan" ];then
		asan="-fsanitize=address -static-libasan"
		shift
		continue
	fi

	if [ "$1" = "--noasan" ];then
		asan=""
		shift
		continue
	fi

	if [ "$1" = "--nomcheck" ];then
		mcheck=""
		shift
		continue
	fi

	if [ "$1" = "--binutils" ];then
		disablebinutils=""
		shift
		continue
	fi

	break
done

rm -f errs1.ok
(
	set -ex
	find -name config.cache|xargs rm -f

	# sourceware.org?
	if test -f `dirname $configure`/bfd/elf64-x86-64.c \
	     -o -f `dirname $configure`/gcc/reload.c;then
		maintainer=""
	else
		:
#		maintainer="--enable-maintainer-mode"
	fi
	if test -f `dirname $configure`/bfd/elf64-x86-64.c;then
		test -f g77 || (test -f /usr/bin/gfortran && ln -s /usr/bin/gfortran g77)
	fi
	if ! $fast;then
		targets="$targets --enable-64-bit-bfd"
	fi
	if ! $fast && test -f `dirname $configure`/bfd/elf64-x86-64.c -a '(' -d CVS -o -d .git ')';then
		targets="$targets --enable-targets=all"
	fi
	if test ! -d readline;then # $fast ||
		targets="$targets --with-system-readline"
	fi

	if test -f `dirname $configure`/gcc/reload.c;then
		werror="--disable-werror"
		customm=""
		# --disable-static would fail on finding built libstdc++ due to -static-libstdc++.
		# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49829
		#customss=""
		customss="--disable-static --enable-shared"
	else
		werror=""
	fi

	if test -d readline/doc && ! test -e readline/readline.c;then
		# Fedora gdb.spec prep.
		readline="--with-system-readline"
	fi

	test -z "$CC" && CC=gcc
	: >errs1.c
	# -Wp,-D_FORTIFY_SOURCE=2: /usr/include/features.h:329:3: error: #warning _FORTIFY_SOURCE requested but disabled [-Werror=cpp]
	for flags in																	\
		"$debug -pipe -Wall -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -ftrack-macro-expansion=0 -fno-diagnostics-show-caret $asan"	\
		"$debug -pipe -Wall -fexceptions -fstack-protector --param=ssp-buffer-size=4 -ftrack-macro-expansion=0 -fno-diagnostics-show-caret $asan"	\
		"$debug -pipe -Wall -fexceptions -fstack-protector --param=ssp-buffer-size=4 -ftrack-macro-expansion=0 -fno-diagnostics-show-caret"	\
		"$debug -pipe -Wall -fexceptions -fstack-protector --param=ssp-buffer-size=4"								\
		"$debug -pipe -Wall -fexceptions"													\
		""																	\
		;do
		if [ -z "$flags" ];then
			rm -f errs1.c
			echo >&2 "flags error"
			exit 1
		fi
		# Use -Werror:
		# cc1: warnings being treated as errors
		# archive.c:1: error: -fstack-protector not supported for this target
		"$CC" $flags -Werror -c errs1.c -o /dev/null && break
	done
	if test -n "$customm" && "$CC" $customm -c errs1.c -o /dev/null;then
		flags="$customm $flags"
	fi
	rm -f errs1.c
	if ! echo "$flags"|grep -q 'fsanitize=address';then
		asan=""
	fi
	export CFLAGS="$flags"
	export CXXFLAGS="$flags"
	export GCJFLAGS="$flags"
	export CFLAGS_FOR_TARGET="$flags"
	export CXXFLAGS_FOR_TARGET="$flags"
	export LDFLAGS="$mcheck $asan"

	time nice "$configure" $target $targets $customss $readline $disablebinutils --enable-debug --disable-sim $maintainer $werror --with-separate-debug-dir=/usr/lib/debug --without-guile "$@"
# --enable-gold --enable-plugins

	(ctags; test -d gdb && (cd gdb; ctags; cd testsuite; ctags; cd ../gdbserver; ctags)) &

	errs2

	touch errs1.ok
	) 2>&1|tee errs1
test -f errs1.ok
rc=$?
rm -f errs1.ok
exit $rc