PR #1200: absl/debugging/CMakeLists.txt: link with libexecinfo if needed
Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1200
`backtrace` and `execinfo.h` can be provided by libexecinfo on uclibc and musl resulting in the following build failure with any user of abseil-cpp (such as collectd):
```
/home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/sparc-buildroot-linux-uclibc/10.3.0/../../../../sparc-buildroot-linux-uclibc/bin/ld: /home/buildroot/autobuild/instance-0/output-1/host/bin/../sparc-buildroot-linux-uclibc/sysroot/usr/lib/libabsl_stacktrace.so: undefined reference to `backtrace'
```
[...]
```
libgrpc++ . . . . . . no (libgrpc++ not found)
```
[...]
```
configure: error: "Some plugins are missing dependencies - see the summary above for details"
```
Fixes:
- http://autobuild.buildroot.org/results/6a0484412f020e763ce3ad5bda48f09c78645bff
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Merge dac52cd20efb672278dc64bcd74920172a599ac0 into 93ad4284ac12077b7bac07a4743df1c564e7c957
Merging this change closes #1200
COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1200 from ffontaine:master dac52cd20efb672278dc64bcd74920172a599ac0
PiperOrigin-RevId: 456323163
Change-Id: I3d2206761524d36e2b227c571e2e513f6840ff75
diff --git a/absl/debugging/CMakeLists.txt b/absl/debugging/CMakeLists.txt
index 3295273..d8207d6 100644
--- a/absl/debugging/CMakeLists.txt
+++ b/absl/debugging/CMakeLists.txt
@@ -14,6 +14,8 @@
# limitations under the License.
#
+find_library(EXECINFO_LIBRARY execinfo)
+
absl_cc_library(
NAME
stacktrace
@@ -33,6 +35,8 @@
"stacktrace.cc"
COPTS
${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ $<$<BOOL:${EXECINFO_LIBRARY}>:${EXECINFO_LIBRARY}>
DEPS
absl::debugging_internal
absl::config