hurd: Fix redefinition of 'P2ALIGN'.

When building on GNU/Hurd warnings like the following occur:

    ../sysdeps/x86_64/multiarch/strnlen-evex-base.S:53:10: warning: "P2ALIGN" redefined
       53 | # define P2ALIGN(...)   .p2align 4,, 6
          |          ^~~~~~~
    In file included from /usr/include/x86_64-gnu/mach/x86_64/syscall_sw.h:30,
                     from ../sysdeps/mach/sysdep.h:21,
                     from ../sysdeps/mach/x86/sysdep.h:31,
                     from ../sysdeps/x86_64/multiarch/strnlen-evex-base.S:24:
    /usr/include/x86_64-gnu/mach/x86_64/asm.h:78:9: note: this is the location of the previous definition
       78 | #define P2ALIGN(p2)     .p2align p2     /* gas-specific */
          |         ^~~~~~~

The fix is to undefine the macro from system headers in sysdep.h so that
it can be properly defined in assembly files where its definition
depends on whether string functions are being compiled for
wide-characters or not.
Message-ID: <721cd3a1bae1a553857db1dd69761a175f611364.1750131904.git.collin.funk1@gmail.com>

diff --git a/sysdeps/mach/sysdep.h b/sysdeps/mach/sysdep.h
index 8293c66eb8b4ee3d6e5add3d3278a4dfd73fbb01..581bdcd54d57296c5b17ee2686e94a451e2548d5 100644 (file)
--- a/sysdeps/mach/sysdep.h
+++ b/sysdeps/mach/sysdep.h
@@ -20,6 +20,11 @@
 /* Get the Mach definitions of ENTRY and kernel_trap.  */
 #include <mach/machine/syscall_sw.h>
 
+/* This macro is defined in Mach system headers, but string functions use it
+   with different definitions depending on whether being compiled for
+   wide-characters or not.  */
+#undef P2ALIGN
+
 /* The Mach definitions assume underscores should be prepended to
    symbol names.  Redefine them to do so only when appropriate.  */
 #undef EXT