[PATCH] gcc3/ld patch for direct-linking-to-dll and
danny_r_smith_2001 at yahoo.co.nz
Mon Sep 8 12:28:57 CEST 2003
Hello Nick, Ralf
> From: Nick Clifton <nickc at redhat dot com>
> Hi Ralf,
> > while compiling trolltechs qt/xfree library with gcc3 (3.2x) on
> > cygwin I recognized, that the auto-import stuff in combination of
> > recent ld does not work in case of const variables in a dll when
> > using direct linking to a dll, because gcc put those variables into
> > a readonly, that means the .text section.
> > The patch and a testcase is appended. A documentation could be found
> > in the patch file.
> Are you sure that the current linker does not work ?
> When I tried it, using the test case you supplied, but without the
> patch applied, I got this:
> % make
> ../gcc/g++ -B ../gcc/ -g -save-temps -c -o dll.o dll.cc
> ../gcc/g++ -B ../gcc/ -g --shared -L ../i686-pc-cygwin/newlib -L
../i686-pc-cygwin/libstdc++-v3/src/.libs dll.o -o dll.dll
> ../gcc/g++ -B ../gcc/ -g -save-temps -c -o client.o client.cc
> ../gcc/g++ -B ../gcc/ -g -o client client.o -L ../i686-pc-cygwin/newlib -L
../i686-pc-cygwin/libstdc++-v3/src/.libs -L. -ldll
> Info: resolving _var by linking to __imp__var (auto-import)
> Info: resolving test::var by linking to __imp___ZN4test3varE (auto-import)
Yes, but try running ./client.exe. Since the const data variables are
in .text section they are treated as functions, not data. They are
imported without warning, but not as data.
Ralf, what about a less intrusive approach? Compile dll
code with -fdata-sections. This will put const data in
.rdata$foo sections. Then, make pe_implied_import_dll()
scan .rdata as well as .data and .bss. for data symbols
I've tried that with your testcase and it seems to work.
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