commit a6afa9e6b0d9a08ecc878e62343a2af80ff30435
author Rainer Orth <ro@gcc.gnu.org> Thu Feb 10 12:40:32 2022 +0100
committer Rainer Orth <ro@gcc.gnu.org> Thu Feb 10 12:40:32 2022 +0100
tree 550bb16a0a2581f4abc01558b9d17cbe2c7719f2
parent be5734ddaae3521f8ccf3dbf4e747f51aa448936

[Driver] Use libatomic for 32-bit SPARC atomics support

Even after D86621 <https://reviews.llvm.org/D86621>, `clang -m32` on
Solaris/sparcv9 doesn't inline atomics with 8-byte operands, unlike `gcc`.
This leads to many link failures in the testsuite (undefined references to
`__atomic_load_8` and `__sync_val_compare_and_swap_8`.  Until a proper
codegen fix can be implemented, this patch works around the first of those
by linking with `-latomic`.

Tested on `sparcv9-sun-solaris2.11`.

Differential Revision: https://reviews.llvm.org/D118021

clang/test/Driver/solaris-ld.c

diff --git a/clang/test/Driver/solaris-ld.c b/clang/test/Driver/solaris-ld.c
index 59d03c4..d40e5da 100644
--- a/clang/test/Driver/solaris-ld.c
+++ b/clang/test/Driver/solaris-ld.c
@@ -17,6 +17,7 @@
 // CHECK-LD-SPARC32-SAME: "-L[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2"
 // CHECK-LD-SPARC32-SAME: "-L[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2/../../.."
 // CHECK-LD-SPARC32-SAME: "-L[[SYSROOT]]/usr/lib"
+// CHECK-LD-SPARC32-SAME: "-zignore" "-latomic" "-zrecord"
 // CHECK-LD-SPARC32-SAME: "-lgcc_s"
 // CHECK-LD-SPARC32-SAME: "-lc"
 // CHECK-LD-SPARC32-SAME: "-lgcc"
@@ -40,6 +41,7 @@
 // CHECK-LD-SPARC64-SAME: "-L[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2/sparcv9"
 // CHECK-LD-SPARC64-SAME: "-L[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2/../../../sparcv9"
 // CHECK-LD-SPARC64-SAME: "-L[[SYSROOT]]/usr/lib/sparcv9"
+// CHECK-LD-SPARC64-NOT:  "-latomic"
 // CHECK-LD-SPARC64-SAME: "-lgcc_s"
 // CHECK-LD-SPARC64-SAME: "-lc"
 // CHECK-LD-SPARC64-SAME: "-lgcc"
@@ -63,6 +65,7 @@
 // CHECK-LD-X32-SAME: "-L[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4"
 // CHECK-LD-X32-SAME: "-L[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4/../../.."
 // CHECK-LD-X32-SAME: "-L[[SYSROOT]]/usr/lib"
+// CHECK-LD-X32-NOT:  "-latomic"
 // CHECK-LD-X32-SAME: "-lgcc_s"
 // CHECK-LD-X32-SAME: "-lc"
 // CHECK-LD-X32-SAME: "-lgcc"
@@ -86,6 +89,7 @@
 // CHECK-LD-X64-SAME: "-L[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4/amd64"
 // CHECK-LD-X64-SAME: "-L[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4/../../../amd64"
 // CHECK-LD-X64-SAME: "-L[[SYSROOT]]/usr/lib/amd64"
+// CHECK-LD-X64-NOT:  "-latomic"
 // CHECK-LD-X64-SAME: "-lgcc_s"
 // CHECK-LD-X64-SAME: "-lc"
 // CHECK-LD-X64-SAME: "-lgcc"