Reland "Enable `-funwind-tables` flag when building libunwind"
Summary:
Relands https://reviews.llvm.org/D70815.
The original commit set `CMAKE_TRY_COMPILE_TARGET_TYPE` to
`STATIC_LIBRARY` globally in libunwind/CMakeLists.txt, which effectively
disabled the linking step in CMake checks.
This broke some builds (see 938c70b86c7d2165f8c28d5700e9c1ac1263307e).
Here we set CMAKE_TRY_COMPILE_TARGET_TYPE to
STATIC_LIBRARY only when checking for presence of the `-funwind-tables`
flag, and then set it back to the original value so it doesn't affect
other checks.
Reviewers: mstorsjo, jfb
Subscribers: mgorny, christof, libcxx-commits
Tags: #libc
Differential Revision: https://reviews.llvm.org/D71117
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 57fc8ecdbaa7fbb1a13907ca3f7a3cb9f9459d27
diff --git a/test/signal_frame.pass.cpp b/test/signal_frame.pass.cpp
index a6f3f48..a899461 100644
--- a/test/signal_frame.pass.cpp
+++ b/test/signal_frame.pass.cpp
@@ -9,6 +9,8 @@
// Ensure that functions marked as signal frames are reported as such.
+// UNSUPPORTED: libunwind-arm-ehabi
+
#include <assert.h>
#include <stdlib.h>
#include <libunwind.h>
@@ -20,9 +22,7 @@
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
assert(unw_step(&cursor) > 0);
-#if !defined(_LIBUNWIND_ARM_EHABI)
assert(unw_is_signal_frame(&cursor));
-#endif
}
int main() {