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-rw-r--r--llvm/tools/llvmc/cpp.in3
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/tools/llvmc/cpp.in b/llvm/tools/llvmc/cpp.in
index 0abc012c3c8..c3022652da5 100644
--- a/llvm/tools/llvmc/cpp.in
+++ b/llvm/tools/llvmc/cpp.in
@@ -28,7 +28,8 @@
# To compile stacker source, we just run the stacker
# compiler with a default stack size of 2048 entries.
translator.command=@LLVMCC1PLUS@ -quiet %in% -o %out% \
- %opt% %incls% %defs% %WOpts% %fOpts% %MOpts% %args%
+ %opt% %incls% %defs% %WOpts% %fOpts% %MOpts% %args% \
+ -D_GNU_SOURCE
# stkrc doesn't preprocess but we set this to true so
# that we don't run the cp command by default.
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