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| author | Logan Chien <tzuhsiang.chien@gmail.com> | 2011-03-15 09:13:32 +0800 |
|---|---|---|
| committer | Logan Chien <tzuhsiang.chien@gmail.com> | 2011-03-15 09:22:20 +0800 |
| commit | c0a87ab7907e88efa4a5d7cba27e876f0dab1f5b (patch) | |
| tree | 0cc3e3002d1691088dcf392c719955ae4cc59c1e /llvm-host-build.mk | |
| parent | 95b62c22d4e04993d6c3004fe06c372565392253 (diff) | |
| download | external_llvm-c0a87ab7907e88efa4a5d7cba27e876f0dab1f5b.zip external_llvm-c0a87ab7907e88efa4a5d7cba27e876f0dab1f5b.tar.gz external_llvm-c0a87ab7907e88efa4a5d7cba27e876f0dab1f5b.tar.bz2 | |
Implement copy-when-different build rules for tblgen.
Before this commit, tblgen rules will always generate new file,
change the timestamp, and then a lot of c++ files have to be
recompiled.
This commit modifies transform-td-to-out macro. Now, tblgen will
generate its output to an intermediate file. The timestamp of the
inc files will only be changed when the newly generated intermediate
file is different from the old one.
Diffstat (limited to 'llvm-host-build.mk')
| -rw-r--r-- | llvm-host-build.mk | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm-host-build.mk b/llvm-host-build.mk index d7ef682..fe68934 100644 --- a/llvm-host-build.mk +++ b/llvm-host-build.mk @@ -63,5 +63,7 @@ $(hide) $(TBLGEN) \ -I $(LLVM_ROOT_PATH)/lib/Target \ $(if $(strip $(CLANG_ROOT_PATH)),-I $(CLANG_ROOT_PATH)/include,) \ -gen-$(strip $(1)) \ - -o $@ $< + -o $@.tmp $< +$(hide) $(LLVM_ROOT_PATH)/copy-diff.py $@.tmp $@ +$(hide) $(RM) $@.tmp endef |