On Thu, 9 Jul 2026, Martin Storsjö wrote:
On Wed, 8 Jul 2026, Jacek Caban via Mingw-w64-public wrote:
This option is meant to be used alongside --host=aarch64-w64-mingw32 to
enable
a hybrid ARM64X build. Enable the compilation of all ARM64EC-specific files
in
preparation for using -marm64x and ensure that including them on unintended
targets is harmless via preprocessor guards.
Perhaps you could point out, that the old way of building standalone arm64ec
libraries still works as well, and was/is picked up if configuring with an
arm64ec triple.
diff --git a/mingw-w64-crt/configure.ac b/mingw-w64-crt/configure.ac
index 1f1c11eb6..5e5d2f7f3 100644
--- a/mingw-w64-crt/configure.ac
+++ b/mingw-w64-crt/configure.ac
@@ -170,6 +170,18 @@ AS_VAR_IF([enable_libarm64],[yes],[
AS_IF([AS_VAR_TEST_SET([LIB32]) || AS_VAR_TEST_SET([LIB64]) ||
AS_VAR_TEST_SET([LIBARM32])],
[AC_MSG_WARN([Building the runtime to use libarm64 with lib32, lib64 or
libarm32 is unsupported.])])])
+AC_MSG_CHECKING([whether to build the ARM64EC libraries])
+AC_ARG_ENABLE([arm64ec],
+ [AS_HELP_STRING([--enable-arm64ec], [Build the ARM64EC libraries])],
The option description makes this a little bit confusing, as you don't need
to set this when configuring with --host=arm64ec-... And "the arm64ec
libraries" also sounds vague, what are they? As we produce the exact same set
of files as before...
"Include arm64ec specific files even if building for another architecture" is
specific, but also sounds very weird if one isn't familiar with the setup.
In one sense, the option you'd want is --enable-arm64x, which would both
include the files, and implicitly add -marm64x to cflags. But there are
merits to having the two aspects separated like this too.
+ [yes],[AS_VAR_SET([ARM64X])],
+ [AC_MSG_ERROR([invalid argument. Must be either yes or no.])])
+AM_CONDITIONAL([ARM64X], [AS_VAR_TEST_SET([ARM64X])])
I overlooked this part in this commit - and now also later noticed that
commit 2 adds -marm64x.
With that in mind, I definitely think the option should be named
--enable-arm64x, not --enable-arm64ec, and the option description can be
twekaed with that in mind. Since the regular separate-architecture mode of
arm64ec still is an entirely valid way of doing it (even if we might not
want to actually test build that in the long run).
// Martin
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