Hello,
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.
2025-07-23 Peter Bergner <berg...@gcc.gnu.org>
Kishan Parmar <kis...@linux.ibm.com>
ChangeLog:
* configure: Regenerate.
* configure.ac: error out on --with-long-double-64.
gcc/ChangeLog:
* doc/install.texi: Remove incorrect mention of --with-long-double-64.
---
configure | 16 ++++++++++++++++
configure.ac | 11 +++++++++++
gcc/doc/install.texi | 2 +-
3 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index ccec3f21cd8..9b8f29fb33e 100755
--- a/configure
+++ b/configure
@@ -805,6 +805,7 @@ ospace_frag'
ac_user_opts='
enable_option_checking
with_build_libsubdir
+with_long_double_64
with_system_zlib
with_zstd
enable_as_accelerator_for
@@ -1606,6 +1607,7 @@ Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
--without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no)
--with-build-libsubdir=DIR Directory where to find libraries for build
system
+
--with-system-zlib use installed libz
--with-zstd Support zstd compressed debug sections
(default=auto)
@@ -2965,6 +2967,20 @@ 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 89ebe4041b6..33487cea5ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,6 +241,17 @@ 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 09ea87aa812..f787c78b28e 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -2455,7 +2455,7 @@ 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.
--
2.47.1
