[PATCH v2 02/11] Adjust gdb.base/exitsignal.exp for MinGW, second-chance SIGSEGV

[Pedro Alves <pedro@palves.net>]

On native Windows a segmentation fault is delivered as a SEH
exception, so GDB stops twice: once for the first-chance exception,
and -- if no SEH handler in the inferior catches it -- again for the
second-chance exception, after which the process dies.  The testcase
currently continues only once, resulting in:

 ...
 continue
 Continuing.

 Thread 1 received signal SIGSEGV, Segmentation fault.
 0x00007ff765ac1469 in main (argc=1, argv=0x9f2640) at C:/rocgdb/src.cascais-rsync/gdb/testsuite/gdb.base/segv.c:24
 24        *(volatile int *) 0;
 (gdb) PASS: gdb.base/exitsignal.exp: trigger SIGSEGV
 continue
 Continuing.

 Thread 1 received signal SIGSEGV, Segmentation fault.
 0x00007ff765ac1469 in main (argc=1, argv=0x9f2640) at C:/rocgdb/src.cascais-rsync/gdb/testsuite/gdb.base/segv.c:24
 24        *(volatile int *) 0;
 (gdb) FAIL: gdb.base/exitsignal.exp: program terminated with SIGSEGV
 ...

Add a second continue on MinGW to step past the second-chance stop.

With this, gdb.base/exitsignal.exp passes cleanly on MinGW:

 -FAIL: gdb.base/exitsignal.exp: program terminated with SIGSEGV
 +PASS: gdb.base/exitsignal.exp: trigger SIGSEGV, second-chance
 +PASS: gdb.base/exitsignal.exp: program terminated with SIGSEGV

Change-Id: Ibda1540a602b62c26a5b218d930402eccc3ba98f
commit-id: 385755c8
---
 gdb/testsuite/gdb.base/exitsignal.exp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/exitsignal.exp b/gdb/testsuite/gdb.base/exitsignal.exp
index 5099ae1a1d6..341197cf0c8 100644
--- a/gdb/testsuite/gdb.base/exitsignal.exp
+++ b/gdb/testsuite/gdb.base/exitsignal.exp
@@ -53,7 +53,13 @@ gdb_test "print \$_exitcode" " = void" \
 gdb_test "continue" "(Thread .*|Program) received signal SIGSEGV.*" \
     "trigger SIGSEGV"
 
-if {[istarget "*-*-cygwin*"]} {
+if {[istarget "*-*-mingw*"]} {
+    # We're debugging a pure Win32 program with no SEH handler.  The
+    # previous continue caught the first-chance exception.  Now we
+    # catch the second-chance.
+    gdb_test "continue" "Thread .* received signal SIGSEGV.*" \
+	"trigger SIGSEGV, second-chance"
+} elseif {[istarget "*-*-cygwin*"]} {
     # Cygwin calls DebugBreak before it lets the process exit.
     gdb_test "continue" "Thread .* received signal SIGTRAP.*" \
 	"trigger try_to_debug SIGTRAP"
-- 
2.53.0