Add new configure option, --disable-timestamps, intended to turn off anything which would mess up binary/object comparisons. Currently:

- Disables 'Built on ...' in 'foo --version'.
 - Disables timestamps from being embedded into .dir files.

llvm-svn: 103423

llvm/Makefile.config.in

@@ -270,6 +270,9 @@ ENABLE_SHARED := @ENABLE_SHARED@
 # Use -fvisibility-inlines-hidden?
 ENABLE_VISIBILITY_INLINES_HIDDEN := @ENABLE_VISIBILITY_INLINES_HIDDEN@
 
+# Do we want to allow timestamping information into builds?
+ENABLE_TIMESTAMPS := @ENABLE_TIMESTAMPS@
+
 # This option tells the Makefiles to produce verbose output.
 # It essentially prints the commands that make is executing
 #VERBOSE = 1

llvm/Makefile.rules

@@ -447,6 +447,14 @@ else
   endif
 endif
 
+# Support makefile variable to disable any kind of timestamp/non-deterministic
+# info from being used in the build.
+ifeq ($(ENABLE_TIMESTAMPS),1)
+  DOTDIR_TIMESTAMP_COMMAND := $(DATE)
+else
+  DOTDIR_TIMESTAMP_COMMAND := echo 'Created.'
+endif
+
 ifeq ($(HOST_OS),MingW)
   # Work around PR4957
   CPP.Defines += -D__NO_CTYPE_INLINE
@@ -779,7 +787,7 @@ $(DESTDIR)$(PROJ_bindir) $(DESTDIR)$(PROJ_libdir) $(DESTDIR)$(PROJ_includedir) $
 # To create other directories, as needed, and timestamp their creation
 %/.dir:
 	$(Verb) $(MKDIR) $* > /dev/null
-	$(Verb) $(DATE) > $@
+	$(Verb) $(DOTDIR_TIMESTAMP_COMMAND) > $@
 
 .PRECIOUS: $(ObjDir)/.dir $(LibDir)/.dir $(ToolDir)/.dir $(ExmplDir)/.dir
 .PRECIOUS: $(LLVMLibDir)/.dir $(LLVMToolDir)/.dir $(LLVMExmplDir)/.dir

llvm/autoconf/configure.ac

@@ -525,6 +525,20 @@ case "$enableval" in
   *) AC_MSG_ERROR([Invalid setting for --enable-shared. Use "yes" or "no"]) ;;
 esac
 
+dnl Enable embedding timestamp information into build.
+AC_ARG_ENABLE(timestamps,
+  AS_HELP_STRING([--enable-timestamps],
+                 [Enable embedding timestamp information in build (default is YES)]),,
+                 enableval=default)
+case "$enableval" in
+  yes) AC_SUBST(ENABLE_TIMESTAMPS,[1]) ;;
+  no)  AC_SUBST(ENABLE_TIMESTAMPS,[0]) ;;
+  default) AC_SUBST(ENABLE_TIMESTAMPS,[1]) ;;
+  *) AC_MSG_ERROR([Invalid setting for --enable-timestamps. Use "yes" or "no"]) ;;
+esac
+AC_DEFINE_UNQUOTED([ENABLE_TIMESTAMPS],$ENABLE_TIMESTAMPS,
+                   [Define if timestamp information (e.g., __DATE___) is allowed])
+
 dnl Allow specific targets to be specified for building (or not)
 TARGETS_TO_BUILD=""
 AC_ARG_ENABLE([targets],AS_HELP_STRING([--enable-targets],

llvm/configure

@@ -690,6 +690,7 @@ ENABLE_DOXYGEN
 ENABLE_THREADS
 ENABLE_PIC
 ENABLE_SHARED
+ENABLE_TIMESTAMPS
 TARGETS_TO_BUILD
 LLVM_ENUM_TARGETS
 LLVM_ENUM_ASM_PRINTERS
@@ -1410,6 +1411,8 @@ Optional Features:
                           is YES)
   --enable-shared         Build a shared library and link tools against it
                           (default is NO)
+  --enable-timestamps     Enable embedding timestamp information in build
+                          (default is YES)
   --enable-targets        Build specific host targets: all or
                           target1,target2,... Valid targets are: host, x86,
                           x86_64, sparc, powerpc, alpha, arm, mips, spu,
@@ -4923,6 +4926,30 @@ echo "$as_me: error: Invalid setting for --enable-shared. Use \"yes\" or \"no\""
    { (exit 1); exit 1; }; } ;;
 esac
 
+# Check whether --enable-timestamps was given.
+if test "${enable_timestamps+set}" = set; then
+  enableval=$enable_timestamps;
+else
+  enableval=default
+fi
+
+case "$enableval" in
+  yes) ENABLE_TIMESTAMPS=1
+ ;;
+  no)  ENABLE_TIMESTAMPS=0
+ ;;
+  default) ENABLE_TIMESTAMPS=1
+ ;;
+  *) { { echo "$as_me:$LINENO: error: Invalid setting for --enable-timestamps. Use \"yes\" or \"no\"" >&5
+echo "$as_me: error: Invalid setting for --enable-timestamps. Use \"yes\" or \"no\"" >&2;}
+   { (exit 1); exit 1; }; } ;;
+esac
+
+cat >>confdefs.h <<_ACEOF
+#define ENABLE_TIMESTAMPS $ENABLE_TIMESTAMPS
+_ACEOF
+
+
 TARGETS_TO_BUILD=""
 # Check whether --enable-targets was given.
 if test "${enable_targets+set}" = set; then
@@ -11357,7 +11384,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 11360 "configure"
+#line 11387 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -21167,6 +21194,7 @@ ENABLE_DOXYGEN!$ENABLE_DOXYGEN$ac_delim
 ENABLE_THREADS!$ENABLE_THREADS$ac_delim
 ENABLE_PIC!$ENABLE_PIC$ac_delim
 ENABLE_SHARED!$ENABLE_SHARED$ac_delim
+ENABLE_TIMESTAMPS!$ENABLE_TIMESTAMPS$ac_delim
 TARGETS_TO_BUILD!$TARGETS_TO_BUILD$ac_delim
 LLVM_ENUM_TARGETS!$LLVM_ENUM_TARGETS$ac_delim
 LLVM_ENUM_ASM_PRINTERS!$LLVM_ENUM_ASM_PRINTERS$ac_delim
@@ -21175,7 +21203,6 @@ LLVM_ENUM_DISASSEMBLERS!$LLVM_ENUM_DISASSEMBLERS$ac_delim
 ENABLE_CBE_PRINTF_A!$ENABLE_CBE_PRINTF_A$ac_delim
 CLANGPATH!$CLANGPATH$ac_delim
 CLANGXXPATH!$CLANGXXPATH$ac_delim
-ENABLE_BUILT_CLANG!$ENABLE_BUILT_CLANG$ac_delim
 _ACEOF
 
   if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 97; then
@@ -21217,6 +21244,7 @@ _ACEOF
 ac_delim='%!_!# '
 for ac_last_try in false false false false false :; do
   cat >conf$$subs.sed <<_ACEOF
+ENABLE_BUILT_CLANG!$ENABLE_BUILT_CLANG$ac_delim
 OPTIMIZE_OPTION!$OPTIMIZE_OPTION$ac_delim
 EXTRA_OPTIONS!$EXTRA_OPTIONS$ac_delim
 BINUTILS_INCDIR!$BINUTILS_INCDIR$ac_delim
@@ -21313,7 +21341,7 @@ LIBOBJS!$LIBOBJS$ac_delim
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 94; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 95; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5

llvm/include/llvm/Config/config.h.in

@@ -24,6 +24,9 @@
 /* Define if threads enabled */
 #undef ENABLE_THREADS
 
+/* Define if timestamp information (e.g., __DATE___) is allowed */
+#undef ENABLE_TIMESTAMPS
+
 /* Define to 1 if you have the `argz_append' function. */
 #undef HAVE_ARGZ_APPEND
 

llvm/lib/Support/CommandLine.cpp

@@ -1170,7 +1170,9 @@ public:
     std::string CPU = sys::getHostCPUName();
     if (CPU == "generic") CPU = "(unknown)";
     OS << ".\n"
+#if (ENABLE_TIMESTAMPS == 1)
        << "  Built " << __DATE__ << " (" << __TIME__ << ").\n"
+#endif
        << "  Host: " << sys::getHostTriple() << '\n'
        << "  Host CPU: " << CPU << '\n'
        << '\n'