[Buildroot] [git commit branch/2022.02.x] package/gcc: ensure __register_frame is optimized out for glibc
Peter Korsgaard
peter at korsgaard.com
Tue Dec 6 22:02:03 UTC 2022
commit: https://git.buildroot.net/buildroot/commit/?id=5aac65cd8e72691988eb4d184b379e1777e10918
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2022.02.x
On some architectures when building with -O0 the __register_frame
symbol fails to get optimized out which can cause linking failures
when building glibc.
To fix this set -O1 for GCC target libs when building with glibc
and BR2_OPTIMIZE_0 on the problematic target architectures.
This was reported both to GCC [1] and glibc [2] upstream. It is not
entirely clear yet where the bug lies exactly. At the moment the
assumption is that it's GCC, so create a symbol
BR2_TOOLCHAIN_HAS_GCC_BUG_107728.
This issue only seems to occur when linking glibc, not with anything
else, so only compile libgcc from host-gcc-initial with -O1.
Fixes:
- http://autobuild.buildroot.net/results/89b/89b6c6924240b7cf82035a844f3573673e91b364
- http://autobuild.buildroot.net/results/46f/46f4ec99d2b23d354a4bb5e92123d64f0da6ed27
- http://autobuild.buildroot.net/results/839/839f929f700cf181ebdf34389c7806a96f55813e
- http://autobuild.buildroot.net/results/0e2/0e202bf53a683930f3cad6edef2a4dea629eaecb
- http://autobuild.buildroot.net/results/8a8/8a8c917f597fdcca744e696e19e9300b64004335
- http://autobuild.buildroot.net/results/c05/c058b27ed2834dfa633b63ec6c3639ab1e8bf412
- http://autobuild.buildroot.net/results/8ba/8ba8882a861cf7df359c23969c09b2be0725b2e5
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107728
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=29621
Signed-off-by: James Hilliard <james.hilliard1 at gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout at mind.be>
(cherry picked from commit 0fc5c1ccdb11af5185471272ef5eeece81b5e866)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
package/gcc/gcc-initial/gcc-initial.mk | 7 +++++++
toolchain/Config.in | 12 ++++++++++++
2 files changed, 19 insertions(+)
diff --git a/package/gcc/gcc-initial/gcc-initial.mk b/package/gcc/gcc-initial/gcc-initial.mk
index f5bc6c5b77..ebd8e8f017 100644
--- a/package/gcc/gcc-initial/gcc-initial.mk
+++ b/package/gcc/gcc-initial/gcc-initial.mk
@@ -43,6 +43,13 @@ HOST_GCC_INITIAL_CONF_OPTS = \
HOST_GCC_INITIAL_CONF_ENV = \
$(HOST_GCC_COMMON_CONF_ENV)
+# Enable GCC target libs optimizations to optimize out __register_frame
+# when needed for some architectures when building with glibc.
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_107728),y)
+HOST_GCC_INITIAL_CONF_ENV += CFLAGS_FOR_TARGET="$(GCC_COMMON_TARGET_CFLAGS) -O1"
+HOST_GCC_INITIAL_CONF_ENV += CXXFLAGS_FOR_TARGET="$(GCC_COMMON_TARGET_CXXFLAGS) -O1"
+endif
+
HOST_GCC_INITIAL_MAKE_OPTS = $(HOST_GCC_COMMON_MAKE_OPTS) all-gcc all-target-libgcc
HOST_GCC_INITIAL_INSTALL_OPTS = install-gcc install-target-libgcc
diff --git a/toolchain/Config.in b/toolchain/Config.in
index 3c9d61c66b..cb073950de 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -228,6 +228,18 @@ config BR2_TOOLCHAIN_HAS_GCC_BUG_104028
bool
default y if BR2_m68k
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107728
+# https://sourceware.org/bugzilla/show_bug.cgi?id=29621
+config BR2_TOOLCHAIN_HAS_GCC_BUG_107728
+ bool
+ depends on BR2_TOOLCHAIN_USES_GLIBC
+ depends on BR2_OPTIMIZE_0
+ default y if BR2_microblazebe || BR2_microblazeel \
+ || BR2_mips || BR2_mipsel \
+ || BR2_nios2 \
+ || BR2_or1k \
+ || BR2_sh
+
config BR2_TOOLCHAIN_HAS_NATIVE_RPC
bool
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