mingw: alter linker commands to always replace backslashes with forwa…

…rd slashes (boostorg#361)

* src/tools/gcc.jam:
     Add missing :T for target file paths in linker invocation rules.
     This fixes builds when b2 uses a response file instead of the
     command line after a size limit is reached.

Co-authored-by: Christian Seiler <c.seiler@luxflux.de>

src/tools/gcc.jam

@@ -1033,12 +1033,12 @@ rule link.dll ( targets * : sources * : properties * )
 
 actions link bind LIBRARIES
 {
-    "$(CONFIG_COMMAND)" @($(<[1]:T).rsp:O=FC:<=@":>=":E=-L"$(LINKPATH)" -Wl,$(RPATH_OPTION)$(SPACE)-Wl,$(RPATH) -Wl,-rpath-link$(SPACE)-Wl,"$(RPATH_LINK)" -o "$(<)" $(START-GROUP) "$(>:T)" "$(LIBRARIES)" $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS) $(USER_OPTIONS))
+    "$(CONFIG_COMMAND)" @($(<[1]:T).rsp:O=FC:<=@":>=":E=-L"$(LINKPATH)" -Wl,$(RPATH_OPTION)$(SPACE)-Wl,$(RPATH) -Wl,-rpath-link$(SPACE)-Wl,"$(RPATH_LINK)" -o "$(<:T)" $(START-GROUP) "$(>:T)" "$(LIBRARIES)" $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS) $(USER_OPTIONS))
 }
 
 actions link.dll bind LIBRARIES
 {
-    "$(CONFIG_COMMAND)" @($(<[1]:T).rsp:O=FC:<=@":>=":E=-L"$(LINKPATH)" -Wl,$(RPATH_OPTION)$(SPACE)-Wl,$(RPATH) -Wl,$(IMPLIB_OPTION:E=--out-implib),"$(<[2])" -o "$(<[1])" $(HAVE_SONAME)-Wl,$(SONAME_OPTION)$(SPACE)-Wl,"$(SONAME_PREFIX:E=)$(<[1]:D=)" $(SHARED_OPTION:E=-shared) $(START-GROUP) "$(>:T)" "$(LIBRARIES)" $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS) $(USER_OPTIONS))
+    "$(CONFIG_COMMAND)" @($(<[1]:T).rsp:O=FC:<=@":>=":E=-L"$(LINKPATH)" -Wl,$(RPATH_OPTION)$(SPACE)-Wl,$(RPATH) -Wl,$(IMPLIB_OPTION:E=--out-implib),"$(<[2]:T)" -o "$(<[1]:T)" $(HAVE_SONAME)-Wl,$(SONAME_OPTION)$(SPACE)-Wl,"$(SONAME_PREFIX:E=)$(<[1]:D=)" $(SHARED_OPTION:E=-shared) $(START-GROUP) "$(>:T)" "$(LIBRARIES)" $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS) $(USER_OPTIONS))
 }
 
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