autoconf: Add --disable-embed-stdcxx to suppress linking libstdc++.a …

…into llvm.dll with --enable-shared on Cygming.

Cygwin has stdc++.dll in it's distribution, and we can assume distro's stdc++.dll might be available.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122622 91177308-0d34-0410-b5e6-96231b3b80d8

Makefile.config.in

@@ -279,6 +279,9 @@ ENABLE_PIC := @ENABLE_PIC@
 # Do we want to build a shared library and link the tools with it?
 ENABLE_SHARED := @ENABLE_SHARED@
 
+# Do we want to link the stdc++ into a shared library? (Cygming)
+ENABLE_EMBED_STDCXX := @ENABLE_EMBED_STDCXX@
+
 # Use -fvisibility-inlines-hidden?
 ENABLE_VISIBILITY_INLINES_HIDDEN := @ENABLE_VISIBILITY_INLINES_HIDDEN@
 

autoconf/configure.ac

@@ -568,6 +568,18 @@ case "$enableval" in
   *) AC_MSG_ERROR([Invalid setting for --enable-shared. Use "yes" or "no"]) ;;
 esac
 
+dnl Allow libstdc++ is embedded in LLVM.dll.
+AC_ARG_ENABLE(embed-stdcxx,
+  AS_HELP_STRING([--enable-embed-stdcxx],
+                 [Build a shared library with embedded libstdc++ for Win32 DLL (default is YES)]),,
+                 enableval=default)
+case "$enableval" in
+  yes) AC_SUBST(ENABLE_EMBED_STDCXX,[1]) ;;
+  no)  AC_SUBST(ENABLE_EMBED_STDCXX,[0]) ;;
+  default) AC_SUBST(ENABLE_EMBED_STDCXX,[1]) ;;
+  *) AC_MSG_ERROR([Invalid setting for --enable-embed-stdcxx. Use "yes" or "no"]) ;;
+esac
+
 dnl Enable embedding timestamp information into build.
 AC_ARG_ENABLE(timestamps,
   AS_HELP_STRING([--enable-timestamps],

configure

@@ -694,6 +694,7 @@ ENABLE_THREADS
 ENABLE_PTHREADS
 ENABLE_PIC
 ENABLE_SHARED
+ENABLE_EMBED_STDCXX
 ENABLE_TIMESTAMPS
 TARGETS_TO_BUILD
 LLVM_ENUM_TARGETS
@@ -1421,6 +1422,8 @@ Optional Features:
                           is YES)
   --enable-shared         Build a shared library and link tools against it
                           (default is NO)
+  --enable-embed-stdcxx   Build a shared library with embedded libstdc++ for
+                          Win32 DLL (default is YES)
   --enable-timestamps     Enable embedding timestamp information in build
                           (default is YES)
   --enable-targets        Build specific host targets: all or
@@ -4999,6 +5002,25 @@ echo "$as_me: error: Invalid setting for --enable-shared. Use \"yes\" or \"no\""
    { (exit 1); exit 1; }; } ;;
 esac
 
+# Check whether --enable-embed-stdcxx was given.
+if test "${enable_embed_stdcxx+set}" = set; then
+  enableval=$enable_embed_stdcxx;
+else
+  enableval=default
+fi
+
+case "$enableval" in
+  yes) ENABLE_EMBED_STDCXX=1
+ ;;
+  no)  ENABLE_EMBED_STDCXX=0
+ ;;
+  default) ENABLE_EMBED_STDCXX=1
+ ;;
+  *) { { echo "$as_me:$LINENO: error: Invalid setting for --enable-embed-stdcxx. Use \"yes\" or \"no\"" >&5
+echo "$as_me: error: Invalid setting for --enable-embed-stdcxx. Use \"yes\" or \"no\"" >&2;}
+   { (exit 1); exit 1; }; } ;;
+esac
+
 # Check whether --enable-timestamps was given.
 if test "${enable_timestamps+set}" = set; then
   enableval=$enable_timestamps;
@@ -11539,7 +11561,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 11542 "configure"
+#line 11564 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -21812,11 +21834,11 @@ ENABLE_THREADS!$ENABLE_THREADS$ac_delim
 ENABLE_PTHREADS!$ENABLE_PTHREADS$ac_delim
 ENABLE_PIC!$ENABLE_PIC$ac_delim
 ENABLE_SHARED!$ENABLE_SHARED$ac_delim
+ENABLE_EMBED_STDCXX!$ENABLE_EMBED_STDCXX$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
-LLVM_ENUM_ASM_PARSERS!$LLVM_ENUM_ASM_PARSERS$ac_delim
 _ACEOF
 
   if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 97; then
@@ -21858,6 +21880,7 @@ _ACEOF
 ac_delim='%!_!# '
 for ac_last_try in false false false false false :; do
   cat >conf$$subs.sed <<_ACEOF
+LLVM_ENUM_ASM_PARSERS!$LLVM_ENUM_ASM_PARSERS$ac_delim
 LLVM_ENUM_DISASSEMBLERS!$LLVM_ENUM_DISASSEMBLERS$ac_delim
 ENABLE_CBE_PRINTF_A!$ENABLE_CBE_PRINTF_A$ac_delim
 CLANGPATH!$CLANGPATH$ac_delim
@@ -21954,7 +21977,6 @@ LLVM_CONFIGTIME!$LLVM_CONFIGTIME$ac_delim
 BINDINGS_TO_BUILD!$BINDINGS_TO_BUILD$ac_delim
 ALL_BINDINGS!$ALL_BINDINGS$ac_delim
 OCAML_LIBDIR!$OCAML_LIBDIR$ac_delim
-ENABLE_VISIBILITY_INLINES_HIDDEN!$ENABLE_VISIBILITY_INLINES_HIDDEN$ac_delim
 _ACEOF
 
   if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 97; then
@@ -21996,13 +22018,14 @@ _ACEOF
 ac_delim='%!_!# '
 for ac_last_try in false false false false false :; do
   cat >conf$$subs.sed <<_ACEOF
+ENABLE_VISIBILITY_INLINES_HIDDEN!$ENABLE_VISIBILITY_INLINES_HIDDEN$ac_delim
 RPATH!$RPATH$ac_delim
 RDYNAMIC!$RDYNAMIC$ac_delim
 LIBOBJS!$LIBOBJS$ac_delim
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 4; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 5; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5

tools/llvm-shlib/Makefile

@@ -18,11 +18,12 @@ SHARED_LIBRARY = 1
 include $(LEVEL)/Makefile.config
 
 ifeq ($(HOST_OS), $(filter $(HOST_OS), Cygwin MingW))
-    EXPORTED_SYMBOL_FILE = $(ObjDir)/$(LIBRARYNAME).exports
+  EXPORTED_SYMBOL_FILE = $(ObjDir)/$(LIBRARYNAME).exports
 
+  ifeq (1,$(ENABLE_EMBED_STDCXX))
     # It is needed to force static-stdc++.a linked.
-    # FIXME: It should be omitted when configure detects system's stdc++.dll.
     SHLIB_FRAG_NAMES += stdc++.a.o
+  endif
 
 endif