https://gcc.gnu.org/g:81eff4e45599838612422bd429845ba0117bd7f3
commit r16-9660-g81eff4e45599838612422bd429845ba0117bd7f3 Author: Kishan Parmar <[email protected]> Date: Wed Sep 2 12:10:30 2026 +0530 configure: reject unsupported --with-long-double-64 option [PR122535] Configure script previously accepted unsupported --with-long-double-64 option without any warning, leading to confusion. This option was mistakenly documented in install.texi but never handled by configure script, resulting in it being silently ignored. Patch updates configure script to error out when --with-long-double-64 or --without-long-double-64 is used, and instructs to use the correct --without-long-double-128 or --with-long-double-128 option instead. Additionally, the mistaken documentation reference in install.texi has been corrected to reflect the actual supported option. 2026-09-02 Peter Bergner <[email protected]> ChangeLog: PR target/122535 * configure.ac: Error out on --with-long-double-64. * configure: Regenerate. gcc/ChangeLog: * doc/install.texi: Remove incorrect mention of --with-long-double-64. Co-authored-by: Kishan Parmar <[email protected]> (cherry picked from commit 0367500f385f57f93e01e09b27b0a3b3c7695dd6) Diff: --- configure | 15 +++++++++++++++ configure.ac | 11 +++++++++++ gcc/doc/install.texi | 2 +- 3 files changed, 27 insertions(+), 1 deletion(-) diff --git a/configure b/configure index 083e8823d2b6..a43c1779b43d 100755 --- a/configure +++ b/configure @@ -818,6 +818,7 @@ ospace_frag' ac_user_opts=' enable_option_checking with_build_libsubdir +with_long_double_64 with_system_zlib with_zstd enable_as_accelerator_for @@ -3026,6 +3027,20 @@ if test x$with_gnu_as = xno ; then noconfigdirs="$noconfigdirs gas" fi +# Catch an invalid use of --with-long-double-64 early. + +# Check whether --with-long-double-64 was given. +if test "${with_long_double_64+set}" = set; then : + withval=$with_long_double_64; +if test x$with_long_double_64 = xyes ; then + as_fn_error $? "found --with-long-double-64 but use --without-long-double-128 instead" "$LINENO" 5 +else + as_fn_error $? "found --without-long-double-64 but use --with-long-double-128 instead" "$LINENO" 5 +fi + +fi + + use_included_zlib= # Check whether --with-system-zlib was given. diff --git a/configure.ac b/configure.ac index c5de225b0ac3..5f4dd0377229 100644 --- a/configure.ac +++ b/configure.ac @@ -244,6 +244,17 @@ if test x$with_gnu_as = xno ; then noconfigdirs="$noconfigdirs gas" fi +# Catch an invalid use of --with-long-double-64 early. +AC_ARG_WITH(long-double-64, +[], +[ +if test x$with_long_double_64 = xyes ; then + AC_MSG_ERROR([found --with-long-double-64 but use --without-long-double-128 instead]) +else + AC_MSG_ERROR([found --without-long-double-64 but use --with-long-double-128 instead]) +fi +]) + use_included_zlib= AC_ARG_WITH(system-zlib, [AS_HELP_STRING([--with-system-zlib], [use installed libz])]) diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index 001d16fe67a0..41424773b0a8 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -2492,7 +2492,7 @@ Linux systems and on big endian 64-bit systems where the default cpu is at least power7 (i.e.@: @option{--with-cpu=power7}, @option{--with-cpu=power8}, or @option{--with-cpu=power9} is used). -If you use the @option{--with-long-double-64} configuration option, +If you use the @option{--without-long-double-128} configuration option, the @option{--with-long-double-format=ibm} and @option{--with-long-double-format=ieee} options are ignored.
