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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>
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H.J. Lu
parent
dce754b155
commit
23f12e6e0c
8
INSTALL
8
INSTALL
@ -224,6 +224,14 @@ if 'CFLAGS' is specified it must enable optimization. For example:
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By default for x86_64, the GNU C Library is built with the vector
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math library. Use this option to disable the vector math library.
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'--disable-static-c++-link-check'
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By default, if the C++ toolchain lacks support for static linking,
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configure fails to find the C++ header files and the glibc build
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fails. Use this option to disable the static C++ link check so
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that the C++ header files can be located. The newly built libc.a
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can be used to create static C++ tests if the C++ toolchain has the
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necessary static C++ libraries.
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'--disable-scv'
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Disable using 'scv' instruction for syscalls. All syscalls will
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use 'sc' instead, even if the kernel supports 'scv'. PowerPC only.
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24
configure
vendored
24
configure
vendored
@ -771,6 +771,7 @@ ac_user_opts='
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enable_option_checking
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with_pkgversion
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with_bugurl
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enable_static_c___link_check
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with_gd
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with_gd_include
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with_gd_lib
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@ -1440,6 +1441,8 @@ Optional Features:
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--disable-option-checking ignore unrecognized --enable/--with options
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--disable-FEATURE do not include FEATURE (same as --enable-FEATURE=no)
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--enable-FEATURE[=ARG] include FEATURE [ARG=yes]
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--disable-static-c++-link-check
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disable static C++ link check [default=no]
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--disable-sanity-checks really do not use threads (should not be used except
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in special situations) [default=yes]
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--enable-shared build shared library [default=yes if GNU ld]
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@ -3855,6 +3858,15 @@ if test -z "$CPP"; then
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fi
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# Check whether --enable-static-c++-link-check was given.
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if test ${enable_static_c___link_check+y}
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then :
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enableval=$enable_static_c___link_check; static_cxx_link_check=$enableval
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else $as_nop
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static_cxx_link_check=yes
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fi
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# We need the C++ compiler only for testing.
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@ -4279,10 +4291,11 @@ esac
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.beam \
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conftest$ac_exeext conftest.$ac_ext
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# Static case.
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old_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -static"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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if test $static_cxx_link_check = yes; then
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# Static case.
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old_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -static"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#include <iostream>
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@ -4304,7 +4317,8 @@ esac
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.beam \
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conftest$ac_exeext conftest.$ac_ext
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LDFLAGS="$old_LDFLAGS"
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LDFLAGS="$old_LDFLAGS"
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fi
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ac_ext=c
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ac_cpp='$CPP $CPPFLAGS'
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ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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22
configure.ac
22
configure.ac
@ -52,6 +52,12 @@ fi
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AC_SUBST(cross_compiling)
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AC_PROG_CPP
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AC_ARG_ENABLE([static-c++-link-check],
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AS_HELP_STRING([--disable-static-c++-link-check],
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[disable static C++ link check @<:@default=no@:>@]),
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[static_cxx_link_check=$enableval],
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[static_cxx_link_check=yes])
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# We need the C++ compiler only for testing.
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AC_PROG_CXX
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# It's useless to us if it can't link programs (e.g. missing -lstdc++).
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@ -61,10 +67,11 @@ AC_LANG_PUSH([C++])
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AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
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[libc_cv_cxx_link_ok=yes],
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[libc_cv_cxx_link_ok=no])
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# Static case.
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old_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -static"
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AC_LINK_IFELSE([AC_LANG_SOURCE([
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if test $static_cxx_link_check = yes; then
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# Static case.
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old_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -static"
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AC_LINK_IFELSE([AC_LANG_SOURCE([
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#include <iostream>
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int
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@ -74,9 +81,10 @@ main()
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return 0;
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}
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])],
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[],
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[libc_cv_cxx_link_ok=no])
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LDFLAGS="$old_LDFLAGS"
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[],
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[libc_cv_cxx_link_ok=no])
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LDFLAGS="$old_LDFLAGS"
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fi
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AC_LANG_POP([C++])])
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AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
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@ -252,6 +252,14 @@ configure with @option{--disable-werror}.
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By default for x86_64, @theglibc{} is built with the vector math library.
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Use this option to disable the vector math library.
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@item --disable-static-c++-link-check
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By default, if the C++ toolchain lacks support for static linking,
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configure fails to find the C++ header files and the glibc build fails.
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Use this option to disable the static C++ link check so that the C++
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header files can be located. The newly built libc.a can be used to
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create static C++ tests if the C++ toolchain has the necessary static
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C++ libraries.
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@item --disable-scv
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Disable using @code{scv} instruction for syscalls. All syscalls will use
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@code{sc} instead, even if the kernel supports @code{scv}. PowerPC only.
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