pkg/csource: don't print too much error output

We print whole reproducer programs on failure,
if lots of programs fail, this results in thousands
of lines of output, which is esp bad on travis.
Limit amount of output.

1 files changed, 19 insertions, 0 deletions

diff --git a/pkg/csource/csource_test.go b/pkg/csource/csource_test.go
index 162fcf788..59ca230b6 100644
--- a/pkg/csource/csource_test.go
+++ b/pkg/csource/csource_test.go
@@ -13,6 +13,7 @@ import (
 	"regexp"
 	"runtime"
 	"strings"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -108,14 +109,32 @@ func testTarget(t *testing.T, target *prog.Target, full bool) {
 	}
 }
 
+var failedTests uint32
+
 func testOne(t *testing.T, p *prog.Prog, opts Options) {
+	// Each failure produces lots of output (including full C source).
+	// Frequently lots of tests fail at the same, which produces/tmp/log
+	// tens of thounds of lines of output. Limit amount of output.
+	maxFailures := uint32(10)
+	if os.Getenv("TRAVIS") != "" {
+		maxFailures = 1
+	}
+	if atomic.LoadUint32(&failedTests) > maxFailures {
+		return
+	}
 	src, err := Write(p, opts)
 	if err != nil {
+		if atomic.AddUint32(&failedTests, 1) > maxFailures {
+			t.Fatal()
+		}
 		t.Logf("opts: %+v\nprogram:\n%s\n", opts, p.Serialize())
 		t.Fatalf("%v", err)
 	}
 	bin, err := Build(p.Target, src)
 	if err != nil {
+		if atomic.AddUint32(&failedTests, 1) > maxFailures {
+			t.Fatal()
+		}
 		t.Logf("opts: %+v\nprogram:\n%s\n", opts, p.Serialize())
 		t.Fatalf("%v", err)
 	}