Without awk this is fine by me :-)
The idea of adding -force-response-file as a testing option would work, but I
am not sure whether it is worth it or not.
Please just wait for Sean to give his OK too.
================
Comment at: test/Driver/response-file.c:17
@@ +16,3 @@
+// limit.
+// RUN: awk "BEGIN { while (count++<300000) string=string \"-DTEST \";\
+// RUN: print string }" > %t.1.txt
----------------
My idea for using clang -E to generate the test is something like
clang -E response-gen.c | grep -v \# > %t2
with response-gen.c being
#define M -DTEST
#define M2 M M
#define M4 M2 M2
#define M8 M4 M4
#define M16 M8 M8
#define M32 M16 M16
#define M64 M32 M32
#define M128 M64 M64
#define M256 M128 M128
M256
with as many MXXX as you need.
http://reviews.llvm.org/D4897
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