[PATCH] gcc3/ld patch for direct-linking-to-dll and auto-import support

Nick Clifton nickc at redhat.com
Mon Sep 15 11:34:59 CEST 2003

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)


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