Add GitHub Actions workflow to build Windows binaries via MSYS2

[Copilot]

No CI existed for building native Windows binaries. This adds a GitHub Actions workflow that compiles scws, scws-gen-dict, and libscws on Windows using MSYS2/MinGW64 and autotools.

Workflow: .github/workflows/build-windows.yml

• Triggers: push, pull request, published release, workflow_dispatch
• Runner: windows-latest with MSYS2 MINGW64 shell
• Toolchain: GCC + autoconf/automake/libtool via MSYS2 packages
• Build: autoreconf -fiv → ./configure --disable-shared --enable-static → make → make install
• Artifact: uploads scws.exe, scws-gen-dict.exe, and .a static libs as scws-windows-x64; fails explicitly if any expected binary is missing
• Permissions: contents: read (least-privilege)

[siujamo]

@copilot Error occurred while generate build system, error logs are as follows:

autoreconf-2.73: export WARNINGS=
autoreconf-2.73: Entering directory '.'
autoreconf-2.73: configure.ac: no obvious need to run autopoint
autoreconf-2.73: running: aclocal --force 
autoreconf-2.73: configure.ac: tracing
autoreconf-2.73: running: libtoolize --copy --force
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: Consider adding 'AC_CONFIG_MACRO_DIRS([m4])' to configure.ac,
libtoolize: and rerunning libtoolize and aclocal.
libtoolize: Consider adding '-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
autoreconf-2.73: configure.ac: not using Intltool
autoreconf-2.73: configure.ac: not using Gtkdoc
autoreconf-2.73: configure.ac: no need to run autopoint (confirmed)
autoreconf-2.73: running: aclocal --force 
autoreconf-2.73: running: /usr/bin/autoconf-2.73 --force
configure.ac:29: warning: The macro 'AC_PROG_LIBTOOL' is obsolete.
configure.ac:29: You should run autoupdate.
aclocal.m4:122: AC_PROG_LIBTOOL is expanded from...
configure.ac:29: the top level
configure.ac:41: warning: The macro 'AC_HELP_STRING' is obsolete.
configure.ac:41: You should run autoupdate.
../autoconf-2.73/lib/autoconf/general.m4:205: AC_HELP_STRING is expanded from...
configure.ac:41: the top level
configure.ac:60: warning: The macro 'AC_HELP_STRING' is obsolete.
configure.ac:60: You should run autoupdate.
../autoconf-2.73/lib/autoconf/general.m4:205: AC_HELP_STRING is expanded from...
configure.ac:60: the top level
configure.ac:73: warning: The macro 'AC_HEADER_TIME' is obsolete.
configure.ac:73: You should run autoupdate.
../autoconf-2.73/lib/autoconf/headers.m4:703: AC_HEADER_TIME is expanded from...
configure.ac:73: the top level
configure.ac:80: warning: The macro 'AC_TRY_COMPILE' is obsolete.
configure.ac:80: You should run autoupdate.
../autoconf-2.73/lib/autoconf/general.m4:2903: AC_TRY_COMPILE is expanded from...
configure.ac:80: the top level
autoreconf-2.73: running: /usr/bin/autoheader-2.73 --force
autoreconf-2.73: running: automake --add-missing --copy --force-missing
configure.ac:23: installing './compile'
configure.ac:29: installing './config.guess'
configure.ac:29: installing './config.sub'
configure.ac:9: installing './install-sh'
configure.ac:9: installing './missing'
Makefile.am:24: error: '#' comment at start of rule is unportable
Makefile.am: installing './INSTALL'
cli/Makefile.am:8: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
cli/Makefile.am: installing './depcomp'
autoreconf-2.73: error: automake failed with exit status: 1
Error: Process completed with exit code 1.

[Copilot]

@copilot Error occurred while generate build system, error logs are as follows:

...

Fixed in commit 3a2337e. The root cause was a # comment character after a tab inside the sync-web recipe body in Makefile.am (line 24). Newer automake rejects this as unportable. Removed the dead commented-out #unison line — the rsync command below it remains intact.

[siujamo]

@copilot Error occurred when Build, error logs are as follows:

make  all-recursive
make[1]: Entering directory '/d/a/scws/scws'
Making all in .
make[2]: Entering directory '/d/a/scws/scws'
make[2]: Leaving directory '/d/a/scws/scws'
Making all in libscws
make[2]: Entering directory '/d/a/scws/scws/libscws'
/bin/sh ../libtool --preserve-dup-deps   --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT charset.lo -MD -MP -MF .deps/charset.Tpo -c -o charset.lo charset.c
/bin/sh ../libtool --preserve-dup-deps   --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT crc32.lo -MD -MP -MF .deps/crc32.Tpo -c -o crc32.lo crc32.c
/bin/sh ../libtool --preserve-dup-deps   --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT pool.lo -MD -MP -MF .deps/pool.Tpo -c -o pool.lo pool.c
/bin/sh ../libtool --preserve-dup-deps   --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT scws.lo -MD -MP -MF .deps/scws.Tpo -c -o scws.lo scws.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT charset.lo -MD -MP -MF .deps/charset.Tpo -c charset.c -o charset.o
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT pool.lo -MD -MP -MF .deps/pool.Tpo -c pool.c -o pool.o
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT scws.lo -MD -MP -MF .deps/scws.Tpo -c scws.c -o scws.o
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT crc32.lo -MD -MP -MF .deps/crc32.Tpo -c crc32.c -o crc32.o
mv -f .deps/crc32.Tpo .deps/crc32.Plo
/bin/sh ../libtool --preserve-dup-deps   --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT xdict.lo -MD -MP -MF .deps/xdict.Tpo -c -o xdict.lo xdict.c
mv -f .deps/pool.Tpo .deps/pool.Plo
/bin/sh ../libtool --preserve-dup-deps   --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT darray.lo -MD -MP -MF .deps/darray.Tpo -c -o darray.lo darray.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT xdict.lo -MD -MP -MF .deps/xdict.Tpo -c xdict.c -o xdict.o
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT darray.lo -MD -MP -MF .deps/darray.Tpo -c darray.c -o darray.o
mv -f .deps/darray.Tpo .deps/darray.Plo
/bin/sh ../libtool --preserve-dup-deps   --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT rule.lo -MD -MP -MF .deps/rule.Tpo -c -o rule.lo rule.c
In file included from scws.c:13:
config_win32.h:19:23: error: expected identifier or '(' before 'float'
   19 | #define logf(x)     ((float)log((double)(x)))
      |                       ^~~~~
config_win32.h:19:29: error: expected ')' before 'log'
   19 | #define logf(x)     ((float)log((double)(x)))
      |                             ^~~
scws.c: In function '_tops_cmp':
scws.c:1293:12: warning: old-style function definition [-Wold-style-definition]
 1293 | static int _tops_cmp(a, b)
      |            ^~~~~~~~~
make[2]: *** [Makefile:452: scws.lo] Error 1
make[2]: *** Waiting for unfinished jobs....
mv -f .deps/charset.Tpo .deps/charset.Plo
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT rule.lo -MD -MP -MF .deps/rule.Tpo -c rule.c -o rule.o
mv -f .deps/xdict.Tpo .deps/xdict.Plo
mv -f .deps/rule.Tpo .deps/rule.Plo
make[2]: Leaving directory '/d/a/scws/scws/libscws'
make[1]: *** [Makefile:406: all-recursive] Error 1
make[1]: Leaving directory '/d/a/scws/scws'
make: *** [Makefile:338: all] Error 2
Error: Process completed with exit code 2.

[Copilot]

@copilot Error occurred when Build, error logs are as follows:

...

Fixed in commit ad1511e. The issue was in libscws/config_win32.h: the #ifndef logf guard only checks for a preprocessor macro, but MinGW provides logf as a standard library function (not a macro). This caused the macro definition to be injected, and when <math.h> was later included in scws.c, the preprocessor tried to expand the logf function prototype through the macro — producing invalid syntax. Changed the guard to #if !defined(__MINGW32__) && !defined(logf) so the fallback macro is only defined on MSVC, where older versions lacked logf.