configure.in (fastjar_warn_cflags): Set when using gcc.

	* configure.in (fastjar_warn_cflags): Set when using gcc.

	* Makefile.am (AM_CFLAGS): Set to @fastjar_warn_cflags@.

From-SVN: r38255

5 files changed, 79 insertions, 57 deletions

diff --git a/fastjar/ChangeLog b/fastjar/ChangeLog
index f06b120..d9f738e 100644
--- a/fastjar/ChangeLog
+++ b/fastjar/ChangeLog
@@ -1,5 +1,11 @@
 2000-12-14  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
+	* configure.in (fastjar_warn_cflags): Set when using gcc.
+
+	* Makefile.am (AM_CFLAGS): Set to @fastjar_warn_cflags@.
+
+2000-12-14  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
 	* compress.c: Include stdlib.h and compress.h.
 	(rcsid): Delete.
 	(report_str_error): Make static.
diff --git a/fastjar/Makefile.am b/fastjar/Makefile.am
index 037b572..fa22049 100644
--- a/fastjar/Makefile.am
+++ b/fastjar/Makefile.am
@@ -48,3 +48,4 @@ grepjar_SOURCES = jargrep.c dostime.c compress.c pushback.c jartool.h zipfile.h
 grepjar_LDADD = $(ZLIBS)
 grepjar_DEPENDENCIES = $(ZDEPS)
 
+AM_CFLAGS = @fastjar_warn_cflags@
diff --git a/fastjar/Makefile.in b/fastjar/Makefile.in
index c797595..6fb57b4 100644
--- a/fastjar/Makefile.in
+++ b/fastjar/Makefile.in
@@ -74,6 +74,7 @@ VERSION = @VERSION@
 ZDEPS = @ZDEPS@
 ZINCS = @ZINCS@
 ZLIBS = @ZLIBS@
+fastjar_warn_cflags = @fastjar_warn_cflags@
 
 AM_MAKEFLAGS =  	"AR_FLAGS=$(AR_FLAGS)" 	"CC_FOR_BUILD=$(CC_FOR_BUILD)" 	"CFLAGS=$(CFLAGS)" 	"CXXFLAGS=$(CXXFLAGS)" 	"CFLAGS_FOR_BUILD=$(CFLAGS_FOR_BUILD)" 	"CFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET)" 	"INSTALL=$(INSTALL)" 	"INSTALL_DATA=$(INSTALL_DATA)" 	"INSTALL_PROGRAM=$(INSTALL_PROGRAM)" 	"INSTALL_SCRIPT=$(INSTALL_SCRIPT)" 	"JC1FLAGS=$(JC1FLAGS)" 	"LDFLAGS=$(LDFLAGS)" 	"LIBCFLAGS=$(LIBCFLAGS)" 	"LIBCFLAGS_FOR_TARGET=$(LIBCFLAGS_FOR_TARGET)" 	"MAKE=$(MAKE)" 	"MAKEINFO=$(MAKEINFO) $(MAKEINFOFLAGS)" 	"PICFLAG=$(PICFLAG)" 	"PICFLAG_FOR_TARGET=$(PICFLAG_FOR_TARGET)" 	"SHELL=$(SHELL)" 	"exec_prefix=$(exec_prefix)" 	"infodir=$(infodir)" 	"libdir=$(libdir)" 	"prefix=$(prefix)" 	"AR=$(AR)" 	"AS=$(AS)" 	"CC=$(CC)" 	"CXX=$(CXX)" 	"LD=$(LD)" 	"LIBCFLAGS=$(LIBCFLAGS)" 	"NM=$(NM)" 	"PICFLAG=$(PICFLAG)" 	"RANLIB=$(RANLIB)" 	"DESTDIR=$(DESTDIR)"
 
@@ -87,6 +88,8 @@ fastjar_DEPENDENCIES = $(ZDEPS)
 grepjar_SOURCES = jargrep.c dostime.c compress.c pushback.c jartool.h zipfile.h dostime.h compress.h pushback.h
 grepjar_LDADD = $(ZLIBS)
 grepjar_DEPENDENCIES = $(ZDEPS)
+
+AM_CFLAGS = @fastjar_warn_cflags@
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs
 CONFIG_HEADER = config.h
@@ -113,7 +116,7 @@ configure.in install-defs.sh.in install-sh missing mkinstalldirs
 
 DISTFILES = $(DIST_COMMON) $(SOURCES) $(HEADERS) $(TEXINFOS) $(EXTRA_DIST)
 
-TAR = gtar
+TAR = gnutar
 GZIP_ENV = --best
 SOURCES = $(fastjar_SOURCES) $(grepjar_SOURCES)
 OBJECTS = $(fastjar_OBJECTS) $(grepjar_OBJECTS)
diff --git a/fastjar/configure b/fastjar/configure
index 0e5d54a..d0bb104 100755
--- a/fastjar/configure
+++ b/fastjar/configure
@@ -1208,17 +1208,22 @@ else
 fi
 
 
+if test "$GCC" = yes; then
+  fastjar_warn_cflags='-W -Wall -pedantic -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings'
+fi
+
+
 ac_header_dirent=no
 for ac_hdr in dirent.h sys/ndir.h sys/dir.h ndir.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr that defines DIR""... $ac_c" 1>&6
-echo "configure:1217: checking for $ac_hdr that defines DIR" >&5
+echo "configure:1222: checking for $ac_hdr that defines DIR" >&5
 if eval "test \"`echo '$''{'ac_cv_header_dirent_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1222 "configure"
+#line 1227 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <$ac_hdr>
@@ -1226,7 +1231,7 @@ int main() {
 DIR *dirp = 0;
 ; return 0; }
 EOF
-if { (eval echo configure:1230: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1235: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   eval "ac_cv_header_dirent_$ac_safe=yes"
 else
@@ -1251,7 +1256,7 @@ done
 # Two versions of opendir et al. are in -ldir and -lx on SCO Xenix.
 if test $ac_header_dirent = dirent.h; then
 echo $ac_n "checking for opendir in -ldir""... $ac_c" 1>&6
-echo "configure:1255: checking for opendir in -ldir" >&5
+echo "configure:1260: checking for opendir in -ldir" >&5
 ac_lib_var=`echo dir'_'opendir | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -1259,7 +1264,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-ldir  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 1263 "configure"
+#line 1268 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -1270,7 +1275,7 @@ int main() {
 opendir()
 ; return 0; }
 EOF
-if { (eval echo configure:1274: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1279: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -1292,7 +1297,7 @@ fi
 
 else
 echo $ac_n "checking for opendir in -lx""... $ac_c" 1>&6
-echo "configure:1296: checking for opendir in -lx" >&5
+echo "configure:1301: checking for opendir in -lx" >&5
 ac_lib_var=`echo x'_'opendir | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -1300,7 +1305,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lx  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 1304 "configure"
+#line 1309 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -1311,7 +1316,7 @@ int main() {
 opendir()
 ; return 0; }
 EOF
-if { (eval echo configure:1315: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1320: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -1334,7 +1339,7 @@ fi
 fi
 
 echo $ac_n "checking how to run the C preprocessor""... $ac_c" 1>&6
-echo "configure:1338: checking how to run the C preprocessor" >&5
+echo "configure:1343: checking how to run the C preprocessor" >&5
 # On Suns, sometimes $CPP names a directory.
 if test -n "$CPP" && test -d "$CPP"; then
   CPP=
@@ -1349,13 +1354,13 @@ else
   # On the NeXT, cc -E runs the code through the compiler's parser,
   # not just through cpp.
   cat > conftest.$ac_ext <<EOF
-#line 1353 "configure"
+#line 1358 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1359: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1364: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -1366,13 +1371,13 @@ else
   rm -rf conftest*
   CPP="${CC-cc} -E -traditional-cpp"
   cat > conftest.$ac_ext <<EOF
-#line 1370 "configure"
+#line 1375 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1376: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1381: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -1383,13 +1388,13 @@ else
   rm -rf conftest*
   CPP="${CC-cc} -nologo -E"
   cat > conftest.$ac_ext <<EOF
-#line 1387 "configure"
+#line 1392 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1393: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1398: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -1414,12 +1419,12 @@ fi
 echo "$ac_t""$CPP" 1>&6
 
 echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
-echo "configure:1418: checking for ANSI C header files" >&5
+echo "configure:1423: checking for ANSI C header files" >&5
 if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1423 "configure"
+#line 1428 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 #include <stdarg.h>
@@ -1427,7 +1432,7 @@ else
 #include <float.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1431: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1436: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -1444,7 +1449,7 @@ rm -f conftest*
 if test $ac_cv_header_stdc = yes; then
   # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 1448 "configure"
+#line 1453 "configure"
 #include "confdefs.h"
 #include <string.h>
 EOF
@@ -1462,7 +1467,7 @@ fi
 if test $ac_cv_header_stdc = yes; then
   # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 1466 "configure"
+#line 1471 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 EOF
@@ -1483,7 +1488,7 @@ if test "$cross_compiling" = yes; then
   :
 else
   cat > conftest.$ac_ext <<EOF
-#line 1487 "configure"
+#line 1492 "configure"
 #include "confdefs.h"
 #include <ctype.h>
 #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
@@ -1494,7 +1499,7 @@ if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
 exit (0); }
 
 EOF
-if { (eval echo configure:1498: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:1503: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -1518,12 +1523,12 @@ EOF
 fi
 
 echo $ac_n "checking whether struct tm is in sys/time.h or time.h""... $ac_c" 1>&6
-echo "configure:1522: checking whether struct tm is in sys/time.h or time.h" >&5
+echo "configure:1527: checking whether struct tm is in sys/time.h or time.h" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_tm'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1527 "configure"
+#line 1532 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <time.h>
@@ -1531,7 +1536,7 @@ int main() {
 struct tm *tp; tp->tm_sec;
 ; return 0; }
 EOF
-if { (eval echo configure:1535: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1540: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm=time.h
 else
@@ -1555,17 +1560,17 @@ for ac_hdr in fcntl.h unistd.h sys/param.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:1559: checking for $ac_hdr" >&5
+echo "configure:1564: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1564 "configure"
+#line 1569 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1569: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1574: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -1593,12 +1598,12 @@ done
 
 
 echo $ac_n "checking for off_t""... $ac_c" 1>&6
-echo "configure:1597: checking for off_t" >&5
+echo "configure:1602: checking for off_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_off_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1602 "configure"
+#line 1607 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -1626,12 +1631,12 @@ EOF
 fi
 
 echo $ac_n "checking whether struct tm is in sys/time.h or time.h""... $ac_c" 1>&6
-echo "configure:1630: checking whether struct tm is in sys/time.h or time.h" >&5
+echo "configure:1635: checking whether struct tm is in sys/time.h or time.h" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_tm'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1635 "configure"
+#line 1640 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <time.h>
@@ -1639,7 +1644,7 @@ int main() {
 struct tm *tp; tp->tm_sec;
 ; return 0; }
 EOF
-if { (eval echo configure:1643: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1648: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm=time.h
 else
@@ -1661,7 +1666,7 @@ fi
 
 
 echo $ac_n "checking size of char""... $ac_c" 1>&6
-echo "configure:1665: checking size of char" >&5
+echo "configure:1670: checking size of char" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_char'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1669,7 +1674,7 @@ else
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 1673 "configure"
+#line 1678 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -1680,7 +1685,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:1684: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:1689: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_char=`cat conftestval`
 else
@@ -1700,7 +1705,7 @@ EOF
 
 
 echo $ac_n "checking size of short""... $ac_c" 1>&6
-echo "configure:1704: checking size of short" >&5
+echo "configure:1709: checking size of short" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_short'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1708,7 +1713,7 @@ else
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 1712 "configure"
+#line 1717 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -1719,7 +1724,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:1723: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:1728: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_short=`cat conftestval`
 else
@@ -1739,7 +1744,7 @@ EOF
 
 
 echo $ac_n "checking size of int""... $ac_c" 1>&6
-echo "configure:1743: checking size of int" >&5
+echo "configure:1748: checking size of int" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_int'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1747,7 +1752,7 @@ else
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 1751 "configure"
+#line 1756 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -1758,7 +1763,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:1762: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:1767: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_int=`cat conftestval`
 else
@@ -1778,7 +1783,7 @@ EOF
 
 
 echo $ac_n "checking size of long""... $ac_c" 1>&6
-echo "configure:1782: checking size of long" >&5
+echo "configure:1787: checking size of long" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_long'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1786,7 +1791,7 @@ else
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 1790 "configure"
+#line 1795 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -1797,7 +1802,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:1801: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:1806: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_long=`cat conftestval`
 else
@@ -1817,7 +1822,7 @@ EOF
 
 
 echo $ac_n "checking size of long long""... $ac_c" 1>&6
-echo "configure:1821: checking size of long long" >&5
+echo "configure:1826: checking size of long long" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_long_long'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1825,7 +1830,7 @@ else
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 1829 "configure"
+#line 1834 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -1836,7 +1841,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:1840: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:1845: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_long_long=`cat conftestval`
 else
@@ -1857,14 +1862,14 @@ EOF
 
 
 echo $ac_n "checking whether byte ordering is bigendian""... $ac_c" 1>&6
-echo "configure:1861: checking whether byte ordering is bigendian" >&5
+echo "configure:1866: checking whether byte ordering is bigendian" >&5
 if eval "test \"`echo '$''{'ac_cv_c_bigendian'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_bigendian=unknown
 # See if sys/param.h defines the BYTE_ORDER macro.
 cat > conftest.$ac_ext <<EOF
-#line 1868 "configure"
+#line 1873 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -1875,11 +1880,11 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:1879: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1884: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   # It does; now see whether it defined to BIG_ENDIAN or not.
 cat > conftest.$ac_ext <<EOF
-#line 1883 "configure"
+#line 1888 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -1890,7 +1895,7 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:1894: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1899: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_bigendian=yes
 else
@@ -1910,7 +1915,7 @@ if test "$cross_compiling" = yes; then
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 1914 "configure"
+#line 1919 "configure"
 #include "confdefs.h"
 main () {
   /* Are we little or big endian?  From Harbison&Steele.  */
@@ -1923,7 +1928,7 @@ main () {
   exit (u.c[sizeof (long) - 1] == 1);
 }
 EOF
-if { (eval echo configure:1927: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:1932: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_bigendian=no
 else
@@ -2103,6 +2108,7 @@ s%@RM@%$RM%g
 s%@CP@%$CP%g
 s%@STRIP@%$STRIP%g
 s%@CHMOD@%$CHMOD%g
+s%@fastjar_warn_cflags@%$fastjar_warn_cflags%g
 s%@CPP@%$CPP%g
 s%@ZLIBS@%$ZLIBS%g
 s%@ZDEPS@%$ZDEPS%g
diff --git a/fastjar/configure.in b/fastjar/configure.in
index 000b991..ca0e670 100644
--- a/fastjar/configure.in
+++ b/fastjar/configure.in
@@ -11,6 +11,12 @@ AC_PATH_PROG(CP, cp, /bin/cp, $PATH:/bin:/usr/bin:/usr/local/bin)
 AC_PATH_PROG(STRIP, strip, /usr/bin/strip, $PATH:/bin:/usr/bin:/usr/local/bin)
 AC_PATH_PROG(CHMOD, chmod, /bin/chmod, $PATH:/bin:/usr/bin:/usr/local/bin)
 
+dnl Add warning flags if we are using gcc.
+if test "$GCC" = yes; then
+  fastjar_warn_cflags='-W -Wall -pedantic -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings'
+fi
+AC_SUBST(fastjar_warn_cflags)
+
 dnl Checks for header files.
 AC_HEADER_DIRENT
 AC_HEADER_STDC