[cfe-dev] link time issue

[Dorian Haglund via cfe-dev]

Hello Clang devs!

I'm trying to build a plugin for clang. I followed the basic tutorial
available on the Clang documentation.

Everything works fine but recompiling the plugin takes about 25 seconds on
a powerful PC.
Do you know a way to reduce this compilation time ?

Here is the verbose build command line:


time ninja -v -j$(nproc ) bin/plus-watcher


[1/2] /usr/lib/ccache/c++  -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GNU_SOURCE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-Itools/clang/tools/extra/plus-watcher
-I/home/dorian/clang-llvm/llvm/tools/clang/tools/extra/plus-watcher
-I/home/dorian/clang-llvm/llvm/tools/clang/include -Itools/clang/include
-I/usr/include/libxml2 -Iinclude -I/home/dorian/clang-llvm/llvm/include
-fPIC -fvisibility-inlines-hidden -Werror=date-time -std=c++11 -Wall -W
-Wno-unused-parameter -Wwrite-strings -Wcast-qual
-Wno-missing-field-initializers -pedantic -Wno-long-long
-Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment -fno-common
-Woverloaded-virtual -fno-strict-aliasing -g    -fno-exceptions -fno-rtti
-MD -MT
tools/clang/tools/extra/plus-watcher/CMakeFiles/plus-watcher.dir/PlusWatcher2.cpp.o
-MF
tools/clang/tools/extra/plus-watcher/CMakeFiles/plus-watcher.dir/PlusWatcher2.cpp.o.d
-o
tools/clang/tools/extra/plus-watcher/CMakeFiles/plus-watcher.dir/PlusWatcher2.cpp.o
-c
/home/dorian/clang-llvm/llvm/tools/clang/tools/extra/plus-watcher/PlusWatcher2.cpp
[2/2] : && /usr/lib/ccache/c++  -fPIC -fvisibility-inlines-hidden
-Werror=date-time -std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings
-Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long
-Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment -fno-common
-Woverloaded-virtual -fno-strict-aliasing -g  -Wl,-allow-shlib-undefined
-Wl,-rpath-link,/home/dorian/clang-llvm/build/./lib
tools/clang/tools/extra/plus-watcher/CMakeFiles/plus-watcher.dir/PlusWatcher.cpp.o
tools/clang/tools/extra/plus-watcher/CMakeFiles/plus-watcher.dir/PlusWatcher2.cpp.o
-o bin/plus-watcher  -Wl,-rpath,"\$ORIGIN/../lib" lib/libLLVMSupport.a
-lpthread lib/libclangTooling.a lib/libclangBasic.a
lib/libclangASTMatchers.a lib/libclangFormat.a lib/libclangFrontend.a
lib/libclangDriver.a lib/libclangParse.a lib/libLLVMMCParser.a
lib/libclangSerialization.a lib/libclangSema.a lib/libclangEdit.a
lib/libclangAnalysis.a lib/libLLVMBitReader.a lib/libLLVMProfileData.a
lib/libclangToolingCore.a lib/libclangAST.a lib/libclangRewrite.a
lib/libclangLex.a lib/libclangBasic.a lib/libLLVMCore.a
lib/libLLVMBinaryFormat.a lib/libLLVMMC.a lib/libLLVMOption.a
lib/libLLVMSupport.a -lz -lrt -ldl -ltinfo -lpthread -lm
lib/libLLVMDemangle.a && :
ninja -v -j$(nproc ) bin/plus-watcher 23.91s

Do you see any option that I could remove ? I don't need any optimization
at the moment.

Best regards,

-- 
Dorian Haglund
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