log properly the compiler used to compile Skia

Using #define's directly from VCL will report the compiler used
to compile VCL, which may be different from the one used for Skia.
Also truncate the log file on opening.

Change-Id: Iddf613613df20505f1abe1dd5468dcc8c7041410
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/97090
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/external/skia/source/skia_compiler.cxx b/external/skia/source/skia_compiler.cxx
new file mode 100644
index 000000000000..6339a4a4f900
--- /dev/null
+++ b/external/skia/source/skia_compiler.cxx
@@ -0,0 +1,20 @@
+/*
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <skia_compiler.hxx>
+
+// Get the type of compiler that Skia is compiled with.
+const char* skia_compiler_name()
+{
+#if defined __clang__
+    return "Clang";
+#elif defined __GNUC__
+    return "GCC";
+#elif defined _MSC_VER
+    return "MSVC";
+#else
+    return "?";
+#endif
+}