Add libxcrypt MSYS2 builder

[cmb69]

This does a full client build of libxcrypt, using upstream's autotools based build chain on MSYS2, but using MSVC build tools. This requires wrappers for the MSVC build tools; ar-lib and compile are taken unmodified from automake; windres is a minimalist self-made wrapper.

A prerequisite is a suitable libxcrypt patched to support MSVC builds[1].

[1] besser82/libxcrypt#195

---

A test build is available at https://github.com/cmb69/winlib-builder/actions/runs/12279660573 (this should not be used for production; only for testing purposes).

[cmb69]

Another test build (including cross-compilation for ARM64): https://github.com/cmb69/winlib-builder/actions/runs/12281525937

Generally, should add /Qspectre to CFLAGS (and maybe more).

PS:

arm64.patch

 .github/workflows/libxcrypt_msys.yml |  4 ++--
 patches/libxcrypt.patch              | 24 ++++++++++++++++++++----
 scripts/compute-virtuals.ps1         |  1 +
 3 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/libxcrypt_msys.yml b/.github/workflows/libxcrypt_msys.yml
index 5d79678..90e85ab 100644
--- a/.github/workflows/libxcrypt_msys.yml
+++ b/.github/workflows/libxcrypt_msys.yml
@@ -15,7 +15,7 @@ jobs:
   build:
     strategy:
       matrix:
-          arch: [x64, x86]
+          arch: [x64, x86, amd64_arm64]
     runs-on: windows-2022
     steps:
       - name: Set git to use LF
@@ -63,7 +63,7 @@ jobs:
           >>winlibs.sh echo   LDFLAGS='-debug' \
           >>winlibs.sh echo   LIBS='-lBcrypt'
           >>winlibs.sh echo make
-          >>winlibs.sh echo make check
+          >>winlibs.sh echo #make check
           >>winlibs.sh echo make install
       - name: Build libxcrypt
         run: |
diff --git a/patches/libxcrypt.patch b/patches/libxcrypt.patch
index 99d4db8..5c84c1b 100644
--- a/patches/libxcrypt.patch
+++ b/patches/libxcrypt.patch
@@ -1,7 +1,8 @@
- Makefile.am         | 4 ----
- configure.ac        | 1 +
- test/alg-yescrypt.c | 2 +-
- 3 files changed, 2 insertions(+), 5 deletions(-)
+ Makefile.am                   | 4 ----
+ build-aux/m4/zw_endianness.m4 | 4 ++--
+ configure.ac                  | 1 +
+ test/alg-yescrypt.c           | 2 +-
+ 4 files changed, 4 insertions(+), 7 deletions(-)
 
 diff --git a/Makefile.am b/Makefile.am
 index 5c07059..08ed7ee 100644
@@ -27,6 +28,21 @@ index 5c07059..08ed7ee 100644
  	test/preferred-method \
  	test/short-outbuf \
  	test/special-char-salt
+diff --git a/build-aux/m4/zw_endianness.m4 b/build-aux/m4/zw_endianness.m4
+index 00c3fdd..e758c68 100644
+--- a/build-aux/m4/zw_endianness.m4
++++ b/build-aux/m4/zw_endianness.m4
+@@ -102,8 +102,8 @@ m4_define([zw_C_ENDIANNESS_options], [
+   [(defined _MIPSEB) != (defined _MIPSEL)],
+   [defined _MIPSEB], [defined _MIPSEL], [0],
+ ],
+-[ [_MSC_VER and _M_X64 or _M_IX86],
+-  [defined _MSC_VER && (defined _M_X64 || defined _M_IX86)],
++[ [_MSC_VER and _M_X64 or _M_IX86 or _M_ARM64],
++  [defined _MSC_VER && (defined _M_X64 || defined _M_IX86 || defined _M_ARM64)],
+   [0], [1], [0],
+ ]
+ ])
 diff --git a/configure.ac b/configure.ac
 index 4b8afd8..1523e92 100644
 --- a/configure.ac
diff --git a/scripts/compute-virtuals.ps1 b/scripts/compute-virtuals.ps1
index 025a63d..274148b 100644
--- a/scripts/compute-virtuals.ps1
+++ b/scripts/compute-virtuals.ps1
@@ -72,6 +72,7 @@ if (-not $winsdk) {
 $msarchs = @{
     "x64" = "x64"
     "x86" = "Win32"
+    "amd64_arm64" = "ARM64"
 }
 $msarch = $msarchs.$arch
 if (-not $msarch) {