Fix [17960b80db]: Missing libtcl?.?.dll.a in Cygwin

Author: jan.nijtmans

changes.md

@@ -19,6 +19,7 @@ to the userbase.
  - [Panic "Buffer Underflow, BUFFER_PADDING not enough"](https://core.tcl-lang.org/tcl/tktview/73bb42)
  - [MS-VS build system: pckIndex.tcl when building for 9 misses "t" for TCL 8.6 part](https://core.tcl-lang.org/tcl/tktview/a77029)
  - [clock format -locale does not look up locale children if parent locale used first](https://core.tcl-lang.org/tcl/tktview/2c0f49)
+ - [Missing libtcl?.?.dll.a in Cygwin](https://core.tcl-lang.org/tcl/tktview/dcedba)
 
 # Incompatibilities
  - No known incompatibilities with the Tcl 9.0.0 public interface.

unix/configure

@@ -5950,7 +5950,7 @@ fi
 	    ;;
 	CYGWIN_*|MINGW32_*|MSYS_*)
 	    SHLIB_CFLAGS="-fno-common"
-	    SHLIB_LD='${CC} -shared'
+	    SHLIB_LD='${CC} -shared -Wl,--out-implib,$(patsubst cyg%.dll,lib%.dll.a,${LIB_FILE})'
 	    SHLIB_SUFFIX=".dll"
 	    DL_OBJS="tclLoadDl.o"
 	    PLAT_OBJS='${CYGWIN_OBJS}'
@@ -10955,7 +10955,12 @@ fi
 
 TCL_UNSHARED_LIB_SUFFIX=${UNSHARED_LIB_SUFFIX}
 TCL_SHARED_LIB_SUFFIX=${SHARED_LIB_SUFFIX}
+if test "$ac_cv_cygwin" = "yes" -a "$SHARED_BUILD" != "0"; then
+eval "TCL_LIB_FILE=cygtcl${LIB_SUFFIX}"
+EXTRA_INSTALL_BINARIES='$(INSTALL_LIBRARY) $(patsubst cyg%.dll,lib%.dll.a,${LIB_FILE}) "$(LIB_INSTALL_DIR)"'
+else
 eval "TCL_LIB_FILE=libtcl${LIB_SUFFIX}"
+fi
 
 # tclConfig.sh needs a version of the _LIB_SUFFIX that has been eval'ed
 # since on some platforms TCL_LIB_FILE contains shell escapes.

unix/configure.ac

@@ -717,7 +717,12 @@ fi
 
 TCL_UNSHARED_LIB_SUFFIX=${UNSHARED_LIB_SUFFIX}
 TCL_SHARED_LIB_SUFFIX=${SHARED_LIB_SUFFIX}
+if test "$ac_cv_cygwin" = "yes" -a "$SHARED_BUILD" != "0"; then
+eval "TCL_LIB_FILE=cygtcl${LIB_SUFFIX}"
+EXTRA_INSTALL_BINARIES='$(INSTALL_LIBRARY) $(patsubst cyg%.dll,lib%.dll.a,${LIB_FILE}) "$(LIB_INSTALL_DIR)"'
+else
 eval "TCL_LIB_FILE=libtcl${LIB_SUFFIX}"
+fi
 
 # tclConfig.sh needs a version of the _LIB_SUFFIX that has been eval'ed
 # since on some platforms TCL_LIB_FILE contains shell escapes.

unix/tcl.m4

@@ -1079,7 +1079,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    ;;
 	CYGWIN_*|MINGW32_*|MSYS_*)
 	    SHLIB_CFLAGS="-fno-common"
-	    SHLIB_LD='${CC} -shared'
+	    SHLIB_LD='${CC} -shared -Wl,--out-implib,$(patsubst cyg%.dll,lib%.dll.a,${LIB_FILE})'
 	    SHLIB_SUFFIX=".dll"
 	    DL_OBJS="tclLoadDl.o"
 	    PLAT_OBJS='${CYGWIN_OBJS}'