libavcodec: Don't use dllexport, only dllimport when building DLLs

The only purpose of dllexport (which is set while building the library
that exports the symbols) is to have the linker automatically
export such symbols into a DLL without using a def file - it doesn't
affect the generated code.

For both MSVC and mingw builds, this isn't essential since we override
what symbols to export via an autogenerated def file instead.

Update a comment in configure to refer to the right concept.

With lld, this avoids warnings about duplicate export directives,
when some symbols are requested to be exported both via dllexport
attributes and via the autogenerated def file.

This also reduces the number of lines of code marginally.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index fcffbce..7f320fe 100755
--- a/configure
+++ b/configure
@@ -3883,7 +3883,7 @@ case $target_os in
     mingw32*|mingw64*)
         target_os=mingw32
         if enabled shared; then
-            # Cannot build both shared and static libs when using dllexport.
+            # Cannot build both shared and static libs when using dllimport.
             disable static
         fi
         check_ldflags -Wl,--nxcompat