llvm13/llvm-better-detect-64bit-atomics-support.patch
Richard Biener 6b6b4b3d80 Accepting request 922852 from home:aaronpuchert:llvm-next
- Update to version 13.0.0.
  * For details, see the release notes:
    - https://releases.llvm.org/13.0.0/docs/ReleaseNotes.html
    - https://releases.llvm.org/13.0.0/tools/clang/docs/ReleaseNotes.html
    - https://releases.llvm.org/13.0.0/tools/clang/tools/extra/docs/ReleaseNotes.html
    - https://releases.llvm.org/13.0.0/projects/libcxx/docs/ReleaseNotes.html
    - https://releases.llvm.org/13.0.0/tools/lld/docs/ReleaseNotes.html
  * New LLVM tools:
    - llvm-otool: Mach-O object file displaying tool.
    - llvm-sim: LLVM IR Similarity Visualizer.
    - llvm-tapi-diff: Diff tool for tbd files.
    - llvm-windres: Tool to manipulate Windows resources.
  * llvm-elfabi was removed.
  * New Clang tools:
    - clang-repl, an interactive interpreter for C/C++.
    - intercept-build, analyze-build: the former intercepts build
      commands to build a compilation database, the latter runs
      the static analyzer over all translation units.
    - scan-build-py: Python reimplementation of scan-build.
- Rebase patches:
  * link-clang-shared.patch
  * llvm-do-not-install-static-libraries.patch
  * llvm-exegesis-link-dylib.patch
- Drop patches that have landed upstream:
  * tablegen-test-link-static.patch
- Run tests on more architectures, disable those that seem to hang.
  Don't run libcxx tests at all anymore because they take so long.
- Relax constraints so that we can build on more machines.

OBS-URL: https://build.opensuse.org/request/show/922852
OBS-URL: https://build.opensuse.org/package/show/devel:tools:compiler/llvm13?expand=0&rev=1
2021-10-04 06:44:10 +00:00

23 lines
795 B
Diff

Better detect 64bit atomics support.
It appears that on i586 std::atomic<uint64_t>::load is compiled into
instruction, but std::atomic<double>::load uses __atomic_load_8. This must
be detected so the build system links it to libatomic.
Index: llvm-12.0.0.src/cmake/modules/CheckAtomic.cmake
===================================================================
--- llvm-12.0.0.src.orig/cmake/modules/CheckAtomic.cmake
+++ llvm-12.0.0.src/cmake/modules/CheckAtomic.cmake
@@ -30,9 +30,12 @@ function(check_working_cxx_atomics64 var
#include <atomic>
#include <cstdint>
std::atomic<uint64_t> x (0);
+std::atomic<double> y (0);
int main() {
uint64_t i = x.load(std::memory_order_relaxed);
+ double j = y.load(std::memory_order_relaxed);
(void)i;
+ (void)j;
return 0;
}
" ${varname})