testsuite, trace: add guards if In-Process Agent library is not found
Several tests in gdb.trace trigger TCL errors if the In-Process Agent
library is not found, e.g.:
Running gdb/testsuite/gdb.trace/change-loc.exp ...
ERROR: tcl error sourcing gdb/testsuite/gdb.trace/change-loc.exp.
ERROR: error copying "gdb/gdb/testsuite/../../gdbserver/libinproctrace.so":
no such file or directory
while executing
"file copy -force $fromfile $tofile"
(procedure "gdb_remote_download" line 29)
invoked from within
"gdb_remote_download target $target_file"
(procedure "gdb_download_shlib" line 6)
invoked from within
"gdb_download_shlib $file"
(procedure "gdb_load_shlib" line 2)
invoked from within
"gdb_load_shlib $libipa"
(file "gdb/testsuite/gdb.trace/change-loc.exp" line 354)
invoked from within
"source gdb/testsuite/gdb.trace/change-loc.exp"
("uplevel" body line 1)
invoked from within
"uplevel #0 source gdb/testsuite/gdb.trace/change-loc.exp"
invoked from within
"catch "uplevel #0 source $test_file_name""
Protect against this error by checking if the library is available.
14 files changed
