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gcc: Don't mess with --with-host-libstdcxx if recent GCC (6+) is used

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"--with-host-libstdcxx" option was removed in GCC 6.x, see [1] because of [2].
So it makes no sense to use it with later GCC versions.

Frankly I don't like that implementation with yet another set of "if XXX",
but since we still support GCC down to 4.8.5 what else we may do?

Well, technically we may keep using things as they are now,
because surprisingly GCC's configure script doesn't mind accepting
meaningless options, but as a person who's looking at differences between
various builds and drill-down to peculiarities of various config
options, I'd prefer to not pollute configure with garbage.

But for all the rest... well, it works now and maybe nodody else cares.

[1] https://gcc.gnu.org/git/?p=gcc.git&a=commit;h=5dc85f7ec719a79ecfbcdd8563b07e5f0f365e65
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67092

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Alexey Brodkin 2021-09-01 22:33:41 +03:00
parent 4de586cd2e
commit e075bdfc94
1 changed files with 12 additions and 8 deletions
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20
scripts/build/cc/gcc.sh
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@ -436,9 +436,11 @@ do_gcc_core_backend() {
# with the same block in do_gcc_backend, below.
if [ "${build_staticlinked}" = "yes" ]; then
core_LDFLAGS+=("-static")
host_libstdcxx_flags+=("-static-libgcc")
host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")
host_libstdcxx_flags+=("-lm")
if [ "${CT_GCC_older_than_6}" = "y" ]; then
host_libstdcxx_flags+=("-static-libgcc")
host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")
host_libstdcxx_flags+=("-lm")
fi
# Companion libraries are build static (eg !shared), so
# the libstdc++ is not pulled automatically, although it
# is needed. Shoe-horn it in our LDFLAGS
@ -446,7 +448,7 @@ do_gcc_core_backend() {
core_LDFLAGS+=("-lstdc++")
core_LDFLAGS+=("-lm")
else
if [ "${CT_CC_GCC_STATIC_LIBSTDCXX}" = "y" ]; then
if [ "${CT_CC_GCC_STATIC_LIBSTDCXX}" = "y" -a "${CT_GCC_older_than_6}" = "y" ]; then
# this is from CodeSourcery arm-2010q1-202-arm-none-linux-gnueabi.src.tar.bz2
# build script
# INFO: if the host gcc is gcc-4.5 then presumably we could use -static-libstdc++,
@ -1084,9 +1086,11 @@ do_gcc_backend() {
# with the same block in do_gcc_core_backend, above.
if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then
final_LDFLAGS+=("-static")
host_libstdcxx_flags+=("-static-libgcc")
host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")
host_libstdcxx_flags+=("-lm")
if [ "${CT_GCC_older_than_6}" = "y" ]; then
host_libstdcxx_flags+=("-static-libgcc")
host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")
host_libstdcxx_flags+=("-lm")
fi
# Companion libraries are build static (eg !shared), so
# the libstdc++ is not pulled automatically, although it
# is needed. Shoe-horn it in our LDFLAGS
@ -1094,7 +1098,7 @@ do_gcc_backend() {
final_LDFLAGS+=("-lstdc++")
final_LDFLAGS+=("-lm")
else
if [ "${CT_CC_GCC_STATIC_LIBSTDCXX}" = "y" ]; then
if [ "${CT_CC_GCC_STATIC_LIBSTDCXX}" = "y" -a "${CT_GCC_older_than_6}" = "y" ]; then
# this is from CodeSourcery arm-2010q1-202-arm-none-linux-gnueabi.src.tar.bz2
# build script
# INFO: if the host gcc is gcc-4.5 then presumably we could use -static-libstdc++,