When branch protections are enabled (see -mbranch-protection), GCC tags
the output object file with metadata describing which security features
are used, allowing the GNU linker to detect incompatibilities between
objects in the same link unit.
Originally, this metadata was conveyed via GNU properties. GCC emitted a
.note.gnu.property section containing a GNU_PROPERTY_AARCH64_FEATURE_1_AND
entry.
Build Attributes v2 (OAv2) aim at replacing GNU properties, provinding
a more flexible way to express complex metadata and making easier for
tools like linkers to parse them.
Since the runtime linker only understands GNU properties, the GNU static
linker translates OAv2 attributes into GNU properties. As a result,
emitting both GNU properties and OAv2 in the same object file is redundant.
When GCC detects OAv2 support in GNU binutils, it therefore emits only
OAv2 directives.
Support for OAv2 was added in [1], along with new tests covering both
the emission/omission of GNU properties/OAv2 directives. However, an older
BTI test that checked for the presence of a GNU properties section was
left unchanged. This test now fails when GNU binutils support OAv2, as no
GNU properties are emitted.
This patch removes the expectations of the presence of GNU properties from
that BTI test.
[1]: 98f5547dce2503d9d0f0cd454184d6870a315538
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/bti-1.c: Update.
---
gcc/testsuite/gcc.target/aarch64/bti-1.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/gcc/testsuite/gcc.target/aarch64/bti-1.c
b/gcc/testsuite/gcc.target/aarch64/bti-1.c
index 53dc2d3cd8b..174b62eb05b 100644
--- a/gcc/testsuite/gcc.target/aarch64/bti-1.c
+++ b/gcc/testsuite/gcc.target/aarch64/bti-1.c
@@ -61,5 +61,3 @@ lab2:
}
/* { dg-final { scan-assembler-times "hint\t34 // bti c" 1 } } */
/* { dg-final { scan-assembler-times "hint\t36 // bti j" 12 } } */
-/* { dg-final { scan-assembler "\.section\t\.note\.gnu\.property" { target
*-*-linux* } } } */
-/* { dg-final { scan-assembler "\.word\t0x7\t\/\/
GNU_PROPERTY_AARCH64_FEATURE_1_AND \\(BTI, PAC, GCS\\)" { target *-*-linux* } }
} */
\ No newline at end of file
--
2.52.0
