Use autoconf to determine whether system has POSIX signals,

instead of relying on port's os.h to tell us.  (Needed for HPUX
where system major version is not enough info.)
configure unsets USE_TK if X libraries not found.
doc/Makefile uses gzcat or zcat as found by autoconf.

1 files changed, 36 insertions, 11 deletions

diff --git a/src/configure.in b/src/configure.in
index 398dff08d7..d57545f150 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -416,8 +416,7 @@ AC_ARG_WITH(CXX,
     [   AC_PROG_CXX])
 AC_SUBST(HAVECXX)
 
-INSTALLPATH="`echo /usr/ucb:$PATH | sed 's/:/ /g'`"
-AC_PATH_PROGS(INSTALL, ginstall installbsd bsdinst scoinst install, NONE, $INSTALLPATH )
+AC_PATH_PROGS(INSTALL, ginstall installbsd bsdinst scoinst install, NONE, /usr/ucb:$PATH )
 if test "$INSTALL" = "NONE"
 then
 	# fall back on our own script
@@ -481,6 +480,7 @@ AC_PATH_PROG(xargs, xargs)
 AC_PATH_PROG(ipcs, ipcs)
 AC_PATH_PROG(ipcrm, ipcrm)
 AC_PATH_PROGS(TR, trbsd tr, NOT_FOUND)
+AC_PATH_PROGS(GZCAT, gzcat zcat, gzcat)
 
 dnl Check tr flags to convert from lower to upper case
 TRSTRINGS="`echo ABCdef | $TR '[[a-z]]' '[[A-Z]]' 2>/dev/null | grep ABCDEF`"
@@ -754,16 +754,39 @@ AC_SUBST(STRCASECMP)
 AC_CHECK_FUNC(cbrt,
 	      AC_DEFINE(HAVE_CBRT),
 	      AC_CHECK_LIB(m, cbrt, AC_DEFINE(HAVE_CBRT)))
+
+# On HPUX 9, rint() is not in regular libm.a but in /lib/pa1.1/libm.a;
+# this hackery with HPUXMATHLIB allows us to cope.
+HPUXMATHLIB=""
 AC_CHECK_FUNC(rint,
 	      AC_DEFINE(HAVE_RINT),
 [
-# On HPUX 9, rint() is not in regular libm.a but in /lib/pa1.1/libm.a
-SPECIALMATHLIB=""
 if [[ -r /lib/pa1.1/libm.a ]] ; then
-    SPECIALMATHLIB="-L /lib/pa1.1 -lm"
+    HPUXMATHLIB="-L /lib/pa1.1 -lm"
 fi
-	      AC_CHECK_LIB(m, rint, AC_DEFINE(HAVE_RINT), , $SPECIALMATHLIB)
+	      AC_CHECK_LIB(m, rint, AC_DEFINE(HAVE_RINT), , $HPUXMATHLIB)
 ])
+AC_SUBST(HPUXMATHLIB)
+
+dnl Check to see if platform has POSIX signal interface.
+dnl NOTE: if this test fails then POSIX signals definitely don't work.
+dnl It could be that the test compiles but the POSIX routines don't
+dnl really work ... in that case the platform-specific port files
+dnl can unset USE_POSIX_SIGNALS and HAVE_POSIX_SIGNALS.  (The former
+dnl goes into config.h, the latter into Makefile.global.)
+
+AC_MSG_CHECKING(for POSIX signal interface)
+AC_TRY_LINK([#include <signal.h>],
+[struct sigaction act, oact;
+sigemptyset(&act.sa_mask);
+act.sa_flags = SA_RESTART;
+sigaction(0, &act, &oact);],
+[AC_DEFINE(USE_POSIX_SIGNALS)
+HAVE_POSIX_SIGNALS="1"
+AC_MSG_RESULT(yes)],
+[HAVE_POSIX_SIGNALS=""
+AC_MSG_RESULT(no)])
+AC_SUBST(HAVE_POSIX_SIGNALS)
 
 dnl Check for Tcl configuration script tclConfig.sh
 
@@ -858,11 +881,13 @@ if test "$USE_X" = true; then
 	X11_LIBS=""
 	AC_CHECK_LIB(X11, XOpenDisplay, X11_LIBS="-lX11",,${X_PRE_LIBS})
 	if test "$X11_LIBS" = ""; then
-		dnl Not having X may be fatal.	Let the user fix this.
-		AC_MSG_WARN([The X11 library '-lX11' could not be found.
-			    Please use the configure options '--x-includes=DIR'
-			    and '--x-libraries=DIR' to specify the X location.
-			    See the file 'config.log' for further diagnostics.])
+		dnl Not having X is bad news for pgtksh. Let the user fix this.
+		AC_MSG_WARN([The X11 library '-lX11' could not be found,
+so TK support will be disabled.  To enable TK support,
+please use the configure options '--x-includes=DIR'
+and '--x-libraries=DIR' to specify the X location.
+See the file 'config.log' for further diagnostics.])
+		USE_TK=
 	fi
 	AC_SUBST(X_LIBS)
 	AC_SUBST(X11_LIBS)