* m4/cc.m4 (CL_AS_NOEXECSTACK): New macro...

* configure.ac: ...used here for setting ASMFLAGS...
* src/Makefile.in: ...which are used here.

ChangeLog

@@ -1,3 +1,9 @@
+2005-08-15  Richard B. Kreckel  <kreckel@ginac.de>
+
+	* m4/cc.m4 (CL_AS_NOEXECSTACK): New macro...
+	* configure.ac: ...used here for setting ASMFLAGS...
+	* src/Makefile.in: ...which are used here.
+
 2005-08-02  Andreas Jochens  <aj@andaco.de>
 
 	* include/cln/config.h.in: Add support for PowerPC 64 CPU.

configure.ac

@@ -51,6 +51,8 @@ AC_PROG_CXXCPP
                       dnl sets variable CXXCPP
 CL_AS_UNDERSCORE
                       dnl sets variable AS_UNDERSCORE, DEFS ASM_UNDERSCORE
+CL_AS_NOEXECSTACK
+                      dnl sets variable ASMFLAGS
 AC_PROG_RANLIB
                       dnl sets variable RANLIB
 AC_PROG_INSTALL

m4/cc.m4

@@ -40,3 +40,30 @@ if test "$ac_compiler_gnu" = yes; then
   fi
 fi
 ])
+
+
+dnl Checks whether the stack can be marked nonexecutable by passing an option
+dnl to the C-compiler when acting on .s files. Appends that option to ASFLAGS.
+dnl This macro is adapted from one found in GLIBC-2.3.5.
+AC_DEFUN([CL_AS_NOEXECSTACK],[
+AC_REQUIRE([AC_PROG_CC])
+AC_CACHE_CHECK([whether --noexecstack is desirable for .s files], cl_cv_as_noexecstack, [dnl
+  cat > conftest.c <<EOF
+void foo() {}
+EOF
+  if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS
+                     -S -o conftest.s conftest.c >/dev/null]) \
+     && grep -q .note.GNU-stack conftest.s \
+     && AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS -Wa,--noexecstack
+                       -c -o conftest.o conftest.s >/dev/null])
+  then
+    cl_cv_as_noexecstack=yes
+  else
+    cl_cv_as_noexecstack=no
+  fi
+  rm -f conftest*])
+  if test "$cl_cv_as_noexecstack" = yes; then
+    ASMFLAGS="$ASMFLAGS -Wa,--noexecstack"
+  fi
+  AC_SUBST(ASMFLAGS)
+])

src/Makefile.in

@@ -122,7 +122,7 @@ alls : $(FILES_S) $(ASMFILES_S)
 
 allo : $(FILES_LO) $(ASMFILES_LO)
 
-ASMFLAGS :=
+ASMFLAGS := @ASMFLAGS@
 ifeq (@AS_UNDERSCORE@,true)
 ASMFLAGS += -DUNDERSCORE
 endif
@@ -185,7 +185,7 @@ $(ASMFILES_LO) : %.lo : %.s
 	|| COMPILER_PATH=/bin $(LIBTOOL_COMPILE) $(CC) $(CFLAGS) $(TARGET_ARCH) -c $<
 else
 $(ASMFILES_LO) : %.lo : %.s
-	$(LIBTOOL_COMPILE) $(CC) $(CFLAGS) $(TARGET_ARCH) -c $<
+	$(LIBTOOL_COMPILE) $(CC) $(CFLAGS) $(ASMFLAGS) $(TARGET_ARCH) -c $<
 endif
 
 endif