Mail Archives: cygwin/2009/03/12/12:54:13
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Dave Korn wrote:
> And the immediate reason for this is the way that TSystem.o is built:
>
> ------------------------build.log------------------------
> g++-4 -O2 -pipe -Wall -Woverloaded-virtual -D_DLL -Iinclude
> -I/usr/X11R6/include -o core/base/src/TSystem.o -c
> core/base/src/TSystem.cxx
> ------------------------build.log------------------------
>
> Why is a -D for _DLL present? That is a reserved definition in the
> implementation's namespace, and in particular it used when compiling
> libstdc++ itself, where it alters the effect of the library headers to
> declare all the library APIs as dllexport - they are dllimport by default,
> which is what user applications want to see.
>
> I manually re-ran the compile command without "-D_DLL" and got a good
> object file:
> So I'll now try rebuilding and retesting without _DLL defined anywhere and
> see if it solves the problem.
Indeed it did. With the attached patch, build and test both ran to
completion without any errors. As far as I can see (thanks, Peter R.) the
_DLL definition conveys information from compiler to linker to tell it which
multilib variant to link against. We have the -shared-libgcc/-static-libgcc
option in the gcc driver and the related specs to serve the same purpose on GNU.
One disclaimer: this could have side-effects on MinGW, and should be
verified there to make sure, if it's a supported platform. (Hopefully it'll
be equally correct there, though).
cheers,
DaveK
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filename="root-cygwin-D_DLL_patch.diff"
diff -pru -x '*.o' -x '*.log' 1st.root/config/Makefile.win32gcc root/config/Makefile.win32gcc
--- 1st.root/config/Makefile.win32gcc 2009-02-26 14:07:32.000000000 +0000
+++ root/config/Makefile.win32gcc 2009-03-12 16:51:25.656250000 +0000
@@ -17,14 +17,14 @@ endif
# Compiler:
CXX = g++
CC = gcc
-CXXFLAGS = -pipe -Wall -Woverloaded-virtual -D_DLL $(EXTRA_CXXFLAGS) \
+CXXFLAGS = -pipe -Wall -Woverloaded-virtual $(EXTRA_CXXFLAGS) \
-I/usr/X11R6/include
-CFLAGS = -pipe -Wall -D_DLL $(EXTRA_CFLAGS) -I/usr/X11R6/include
-CINTCXXFLAGS = -pipe -Wall -Woverloaded-virtual -D_DLL $(EXTRA_CXXFLAGS) \
+CFLAGS = -pipe -Wall $(EXTRA_CFLAGS) -I/usr/X11R6/include
+CINTCXXFLAGS = -pipe -Wall -Woverloaded-virtual $(EXTRA_CXXFLAGS) \
-DG__REGEXP -DG__UNIX -DG__SHAREDLIB \
-DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__CYGWIN \
-DG__NEWSTDHEADER
-CINTCFLAGS = -pipe -Wall -D_DLL $(EXTRA_CFLAGS) \
+CINTCFLAGS = -pipe -Wall $(EXTRA_CFLAGS) \
-DG__REGEXP -DG__UNIX -DG__SHAREDLIB \
-DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__CYGWIN \
-DG__NEWSTDHEADER
diff -pru -x '*.o' -x '*.log' 1st.root/test/Makefile.arch root/test/Makefile.arch
--- 1st.root/test/Makefile.arch 2009-02-26 14:07:26.000000000 +0000
+++ root/test/Makefile.arch 2009-03-12 16:51:16.593750000 +0000
@@ -542,7 +542,7 @@ LD = g++
LDFLAGS = $(OPT) -Wl,--enable-auto-import \
-Wl,--enable-runtime-pseudo-reloc \
-L/usr/X11R6/lib
-SOFLAGS = -shared -D_DLL -Wl,--enable-auto-image-base \
+SOFLAGS = -shared -Wl,--enable-auto-image-base \
-Wl,--export-all-symbols
EXPLLINKLIBS = $(ROOTLIBS) $(ROOTGLIBS)
endif
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