[cfe-dev] clang -E -o support

[Shantonu Sen]

To be more compatible with gcc, clang should support outputting preprocessed source to a file, instead of relying on shell redirection. The attached patch allows "clang -E a.c -o a.i" to work. In fact, it supports the following:

$ echo "" > a.c
$ clang -E a.c
# 1 "a.c" 1
# 0 "a.c"
# 1 "<predefines>" 1
# 1 "a.c" 2

$ clang -E a.c -o -
# 1 "a.c" 1
# 0 "a.c"
# 1 "<predefines>" 1
# 1 "a.c" 2

$ clang -E a.c -o a.i
$ cat a.i
# 1 "a.c" 1
# 0 "a.c"
# 1 "<predefines>" 1
# 1 "a.c" 2
$ clang -E a.c -o /dev/null
$ clang -E a.c -o /System/unwritable

...

Assertion failed: (OutputFD >= 0 && "failed to open output file"), function InitOutputBuffer, file PrintPreprocessedOutput.cpp, line 73. 0 clang 0x0022d655 _ZN40_GLOBAL__N_Signals.cpp_00000000_62F12DC115PrintStackTraceEv + 45 1 clang 0x0022d9fb _ZN40_GLOBAL__N_Signals.cpp_00000000_62F12DC113SignalHandlerEi + 323

I also compiled PrintPreprocessedOutput.cpp with USE_STDIO set to 1 on Mac OS X, so I believe that codepath should work as well.

clang-E-o.patch
Description: Binary data

Shantonu Sen
Apple Inc.


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