Disable prctl test when building for arm or riscv.

[amykhuang]

I'm setting up a buildbot for arm32 using qemu and qemu doesn't support PR_GET_THP_DISABLE.
Disable the test for now while we figure out what to do about that.

Also disable for riscv because we may do the same for riscv buildbots.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Amy Huang (amykhuang)

Changes

I'm setting up a buildbot for arm32 using qemu and qemu doesn't support PR_GET_THP_DISABLE.
Disable the test for now while we figure out what to do about that.

Also disable for riscv because we may do the same for riscv buildbots.

---

Full diff: https://github.com/llvm/llvm-project/pull/143627.diff

1 Files Affected:

• (modified) libc/test/src/sys/prctl/linux/CMakeLists.txt (+6)

diff --git a/libc/test/src/sys/prctl/linux/CMakeLists.txt b/libc/test/src/sys/prctl/linux/CMakeLists.txt
index b06e1c8087008..d02900e1857a0 100644
--- a/libc/test/src/sys/prctl/linux/CMakeLists.txt
+++ b/libc/test/src/sys/prctl/linux/CMakeLists.txt
@@ -1,5 +1,10 @@
 add_custom_target(libc_sys_prctl_unittests)
 
+# Temporarily disable this test while setting up arm and riscv buildbots
+# using qemu, since PR_GET_THP_DISABLE is not supported on qemu.
+if (NOT (LIBC_TARGET_ARCHITECTURE_IS_ARM OR
+	 LIBC_TARGET_ARCHITECTURE_IS_RISCV32 OR
+	 LIBC_TARGET_ARCHITECTURE_IS_RISCV64))
 add_libc_unittest(
   prctl_test
   SUITE
@@ -13,3 +18,4 @@ add_libc_unittest(
     libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
+endif()

[michaelrj-google]

Please also add a comment in the test itself, it may be useful to change the test to not use PR_GET_THP_DISABLE if that's the only value that qemu doesn't support.

[amykhuang]

Added comment; also linking here to which ones QEMU doesn't support: https://gitlab.com/qemu-project/qemu/-/blob/master/linux-user/syscall.c?ref_type=heads#L6519.

[michaelrj-google]

LGTM