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Release process document improvements.

Fleshed out/clarified some steps from the experience of making the
 0.11 release.

--- a/doc/release.txt

+++ b/doc/release.txt

@@ -4,6 +4,9 @@

 - Update OP_LT_* API versioning in configure.ac.

 - Check for uncommitted changes to master.

+- Prepare win32 binaries

+  - Do this before tagging the release, as it may require changes which should

+    be committed

 - Tag the release commit with 'git tag -s vN.M'.

   - Include release notes in the tag annotation.

 - Verify 'make distcheck' produces a tarball with

@@ -25,7 +28,11 @@

 Win32 binaries:

-- Assuming the mingw cross toolchain:

+- Install cross-i686-w64-mingw32-gcc and associated binutils.

+  - If you skip this step, libopus will still try to build with the system gcc

+    and then fail to link.

+- Edit mingw/Makefile to point to the latest versions of libogg. opus, openssl

+  (see <https://archive.mozilla.org/pub/opus/>, checksums in SHA256SUMS.txt)

 - run `make -C mingw`

   - Downloads versions of libogg, opus, openssl.

   - Compiles them.

@@ -37,6 +44,8 @@

 - Add api docs to opus-codec.org.

 - mkdir opusfile-${version}-win32

 - Copy AUTHORS COPYING README.md include/opusfile.h to the release dir.

+  - Don't put opusfile.h in an opusfile-${version}-win32/include directory,

+    just put it straight in the release dir.

 - Merge changes between README.md and the version in the last

   binary release. E.g. it's good to include versions of the dependencies,

   release notes, etc.

@@ -44,14 +53,19 @@

 - Copy .libs/libopusfile-0.dll to the release dir.

 - Copy .libs/libopusfile.a to the release dir.

 - Copy .libs/libopusfile.dll.a to the release dir. (May not be needed?)

-- Copy ./lib/libopusurl-0.dll, etc. to the release dir.

-- Copy ./bin/*.dll to the release dir for dependencies.

+- Copy .libs/libopusurl-0.dll to the release dir.

+- Copy .libs/libopusurl.a to the release dir.

+- Copy .libs/libopusurl.dll.a to the release dir. (May not be needed?)

+- Copy mingw/bin/*.dll to the release dir for dependencies.

 - Copy any other dependent dlls, e.g. on Fedora 23 I needed to copy

     /usr/i686-w64-mingw32/sys-root/mingw/bin/libgcc_s_sjlj-1.dll

     /usr/i686-w64-mingw32/sys-root/mingw/bin/libwinpthread-1.dll

+  On Gentoo I needed to copy

+    /usr/lib64/gcc/i686-w64-mingw32/7.3.0/libgcc_s_sjlj-1.dll

+  TODO: It may be possible to avoid this with CFLAGS="-static-libgcc"

 - Copy doc/latex/refman.pdf to opusfile-${version}-win32/opusfile-${version}.pdf

 - Copy examples/.libs/*.exe to the release dir.

-- Strip *.dll *.a *.exe in the release dir.

+- Run "i686-w64-ming32-strip *.dll *.a *.exe" in the release dir.

 - In the release dir, run:

     sha256sum * > SHA256SUMS.txt

     gpg --detach-sign --armor SHA256SUMS.txt