Add --disable-static-c++-link-check option [BZ #31412]

The current minimum GCC version of glibc build is GCC 6.2 or newer. But
building i686 glibc with GCC 6.4 on Fedora 40 failed since the C++ header
files couldn't be found which was caused by the static C++ link check
failure due to missing __divmoddi4 which was referenced in i686 libc.a
and added to GCC 7.  Add --disable-static-c++-link-check configure option
to disable the static C++ link test.  The newly built i686 libc.a can be
used by GCC 6.4 to create static C++ tests.  This fixes BZ #31412.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/INSTALL b/INSTALL
index 208ec98d4b..02151e6e99 100644
--- a/INSTALL
+++ b/INSTALL
@@ -224,6 +224,14 @@ if 'CFLAGS' is specified it must enable optimization.  For example:
      By default for x86_64, the GNU C Library is built with the vector
      math library.  Use this option to disable the vector math library.
 
+'--disable-static-c++-link-check'
+     By default, if the C++ toolchain lacks support for static linking,
+     configure fails to find the C++ header files and the glibc build
+     fails.  Use this option to disable the static C++ link check so
+     that the C++ header files can be located.  The newly built libc.a
+     can be used to create static C++ tests if the C++ toolchain has the
+     necessary static C++ libraries.
+
 '--disable-scv'
      Disable using 'scv' instruction for syscalls.  All syscalls will
      use 'sc' instead, even if the kernel supports 'scv'.  PowerPC only.