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GCC bug 117423 has a fix

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Document the change in dependency.  As we still need to work
around GCC bug 119085, there is no functional change in ‘configure’.
* configure.ac (emacs_cv_gcc_bug_119085_CFLAGS):
Rename from emacs_cv_gcc_bug_117423_CFLAGS.  All uses changed.
This commit is contained in:
Paul Eggert 2025-07-18 11:49:29 -07:00
parent 0ac1fe8d73
commit 07ee5ebeca
1 changed files with 17 additions and 14 deletions
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31
configure.ac
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@ -2214,30 +2214,33 @@ esac
C_SWITCH_MACHINE=
AC_CACHE_CHECK([for flag to work around GCC bug 117423],
[emacs_cv_gcc_bug_117423_CFLAGS],
[emacs_cv_gcc_bug_117423_CFLAGS='none needed'
AC_CACHE_CHECK([for flag to work around GCC bug 119085],
[emacs_cv_gcc_bug_119085_CFLAGS],
[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.
for emacs_cv_gcc_bug_117423_CFLAGS in \
for emacs_cv_gcc_bug_119085_CFLAGS in \
'none needed' -fno-tree-sra
do
AS_CASE([$emacs_cv_gcc_bug_117423_CFLAGS],
AS_CASE([$emacs_cv_gcc_bug_119085_CFLAGS],
['none needed'], [],
[-fno-tree-sra], [break],
[CFLAGS="$old_CFLAGS $emacs_cv_gcc_bug_117423_CFLAGS"])
[CFLAGS="$old_CFLAGS $emacs_cv_gcc_bug_119085_CFLAGS"])
AC_COMPILE_IFELSE(
[AC_LANG_DEFINES_PROVIDED
[/* Work around GCC bug 117423 with unions containing holes:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117423
[/* Work around GCC bug 119085 with unions containing holes:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119085
GCC bug 117423 is present even in GCC 15.1,
GCC bug 119085 is present even in GCC 15.1,
the current version as of this writing; for now,
assume it is present in all GCC versions starting with GCC 4.
Working wround GCC bug 117423 also works around GCC bug 58416
Working around GCC bug 119095 also works around GCC bug 117423
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117423
which as of 2025-07-17 has a fix that has not been released.
Working wround GCC bug 119085 also works around GCC bug 58416
with double in unions on x86, where the generated insns
copy non-floating-point data via fldl/fstpl instruction pairs.
This can misbehave if the data's bit pattern looks like a NaN.
@ -2247,17 +2250,17 @@ AC_CACHE_CHECK([for flag to work around GCC bug 117423],
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93271
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114659
Although GCC bug 58416 is fixed in GCC 15.1,
GCC bug 117423 is still present there. */
GCC bug 119085 is still present there. */
#if 4 <= __GNUC__ && !defined __clang__
# error "GCC bug 117423 possibly present"
# error "GCC bug 119085 possibly present"
#endif
]],
[break])
done
CFLAGS=$old_CFLAGS])])
AS_CASE([$emacs_cv_gcc_bug_117423_CFLAGS],
AS_CASE([$emacs_cv_gcc_bug_119085_CFLAGS],
[-*],
[C_SWITCH_MACHINE="$C_SWITCH_MACHINE $emacs_cv_gcc_bug_117423_CFLAGS"])
[C_SWITCH_MACHINE="$C_SWITCH_MACHINE $emacs_cv_gcc_bug_119085_CFLAGS"])
AC_SUBST([C_SWITCH_MACHINE])