From: Guy Harris <guy@alum.mit.edu>
Date: Wed, 8 May 2013 06:58:51 +0000 (-0700)
Subject: Don't try -W flags with HP's C compiler.
X-Git-Tag: tcpdump-4.5.0~80^2~11
X-Git-Url: https://git.tcpdump.org/tcpdump/commitdiff_plain/e6ffaf83959eadaf224e2de9da1e71151e3734fd

Don't try -W flags with HP's C compiler.

HP's C compiler cannot be made to exit with a non-zero exit status when
given an unknown compiler flag, so you can't use that to figure out if a
flag is supported, but it *will* print a warning, which we don't want.

In addition, it doesn't support -W flags for warnings in any case, so
let's not bother with them.
---

diff --git a/aclocal.m4 b/aclocal.m4
index 55e32103..6797b205 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -171,6 +171,15 @@ AC_DEFUN(AC_LBL_C_INIT,
 
 	    case "$host_os" in
 
+	    hpux*)
+		    #
+		    # Note that this is HP C, because we have to
+		    # treat it specially below.
+		    #
+		    ac_lbl_cc_is_hp_c=yes
+		    ;;
+
+
 	    irix*)
 		    $1="$$1 -xansi -signed -O"
 		    ;;
@@ -868,13 +877,24 @@ AC_DEFUN(AC_LBL_DEVEL,
 	    $1="$$1 ${LBL_CFLAGS}"
     fi
     if test -f .devel ; then
-	    AC_LBL_CHECK_UNKNOWN_WARNING_OPTION_ERROR()
-	    AC_LBL_CHECK_COMPILER_OPT($1, -Wall)
-	    AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-prototypes)
-	    AC_LBL_CHECK_COMPILER_OPT($1, -Wstrict-prototypes)
-	    AC_LBL_CHECK_COMPILER_OPT($1, -Wwrite-strings)
-	    AC_LBL_CHECK_COMPILER_OPT($1, -Wpointer-arith)
-	    AC_LBL_CHECK_COMPILER_OPT($1, -W)
+	    #
+	    # At least one version of HP's C compiler will not
+	    # exit with a non-zero exit status when given an
+	    # unknown -W flag, even if you use +We and the
+	    # number of the warning it gives for that issue.
+	    #
+	    # We therefore skip all the warning option stuff
+	    # on HP-UX.
+	    #
+	    if test "$ac_lbl_cc_is_hp_c" != yes; then
+		    AC_LBL_CHECK_UNKNOWN_WARNING_OPTION_ERROR()
+		    AC_LBL_CHECK_COMPILER_OPT($1, -Wall)
+		    AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-prototypes)
+		    AC_LBL_CHECK_COMPILER_OPT($1, -Wstrict-prototypes)
+		    AC_LBL_CHECK_COMPILER_OPT($1, -Wwrite-strings)
+		    AC_LBL_CHECK_COMPILER_OPT($1, -Wpointer-arith)
+		    AC_LBL_CHECK_COMPILER_OPT($1, -W)
+	    fi
 	    if test "$GCC" = yes ; then
 		    if test "${LBL_CFLAGS+set}" != set; then
 			    if test "$ac_cv_prog_cc_g" = yes ; then
diff --git a/configure b/configure
index f7b49d81..f46c469d 100755
--- a/configure
+++ b/configure
@@ -3046,6 +3046,15 @@ echo "$as_me: error: see the INSTALL doc for more info" >&2;}
 
 	    case "$host_os" in
 
+	    hpux*)
+		    #
+		    # Note that this is HP C, because we have to
+		    # treat it specially below.
+		    #
+		    ac_lbl_cc_is_hp_c=yes
+		    ;;
+
+
 	    irix*)
 		    V_CCOPT="$V_CCOPT -xansi -signed -O"
 		    ;;
@@ -11289,6 +11298,16 @@ rm -f os-proto.h
 	    V_CCOPT="$V_CCOPT ${LBL_CFLAGS}"
     fi
     if test -f .devel ; then
+	    #
+	    # At least one version of HP's C compiler will not
+	    # exit with a non-zero exit status when given an
+	    # unknown -W flag, even if you use +We and the
+	    # number of the warning it gives for that issue.
+	    #
+	    # We therefore skip all the warning option stuff
+	    # on HP-UX.
+	    #
+	    if test "$ac_lbl_cc_is_hp_c" != yes; then
 
 	{ echo "$as_me:$LINENO: checking whether the compiler fails when given an unknown warning option" >&5
 echo $ECHO_N "checking whether the compiler fails when given an unknown warning option... $ECHO_C" >&6; }
@@ -11685,6 +11704,7 @@ fi
 
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
+	    fi
 	    if test "$GCC" = yes ; then
 		    if test "${LBL_CFLAGS+set}" != set; then
 			    if test "$ac_cv_prog_cc_g" = yes ; then