GCC bug 119085 fixed in GCC 16

* configure.ac (emacs_cv_gcc_bug_119085_CFLAGS):
Assume the bug is fixed starting in GCC 16.

(cherry picked from commit 69af0d4c856962abad975fed57abd20f893ce16e)

diff --git a/configure.ac b/configure.ac
index e25538a7f838a72fbd2e0a6e236e396bd8698289..cfdd2a9c367b320bbbfcf47173c87e94b0c0101c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -2218,8 +2218,7 @@ AC_CACHE_CHECK([for flag to work around GCC bug 119085],
   [emacs_cv_gcc_bug_119085_CFLAGS='none needed'
    AS_IF([test "$GCC" = yes],
      [old_CFLAGS=$CFLAGS
-      # If no flags are needed (e.g., not GCC 4+), don't use any.
-      # Otherwise, use -fno-tree-sra.
+      # Use -fno-tree-sra if GCC 4 through 15.
       for emacs_cv_gcc_bug_119085_CFLAGS in \
          'none needed' -fno-tree-sra
       do
@@ -2231,13 +2230,13 @@ AC_CACHE_CHECK([for flag to work around GCC bug 119085],
          [AC_LANG_DEFINES_PROVIDED
           [/* Work around GCC bug 119085 with unions containing holes:
               https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119085
-              GCC bug 119085 is present even in GCC 15.1,
-              the current version as of this writing; for now,
-              assume it is present in all GCC versions starting with GCC 4.
+              Although GCC bug 119085 is present in GCC 15.1,
+              as of 2025-07-23 a patch is in the works for GCC 16;
+              for now, assume the bug exists in GCC versions 4 through 15.
 
               Working around GCC bug 119095 also works around GCC bug 117423
               https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117423
-              which as of 2025-07-17 has a fix that has not been released.
+              which as of 2025-07-23 is planned to be fixed in GCC 15.2.
 
               Working wround GCC bug 119085 also works around GCC bug 58416
               with double in unions on x86, where the generated insns
@@ -2248,9 +2247,8 @@ AC_CACHE_CHECK([for flag to work around GCC bug 119085],
                 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71460
                 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93271
                 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114659
-              Although GCC bug 58416 is fixed in GCC 15.1,
-              GCC bug 119085 is still present there.  */
-           #if 4 <= __GNUC__ && !defined __clang__
+              GCC bug 58416 is fixed in GCC 15.1.  */
+           #if 4 <= __GNUC__ && __GNUC__ <= 15 && !defined __clang__
            # error "GCC bug 119085 possibly present"
            #endif
          ]],