Hi,
here some statistics when building LLVM v3.8.0rc3 with CMAKE and GCC
v4.9.2 or CLANG v3.8.0rc3 here on my Ubuntu/precise AMD64 system.
[ THE GOOD (disc-usage) ]
Compiling with clang-3.8 produces smaller binaries VS. gcc-4.9
(approx. 250MiB smaller).
Checking with 'wc -l' shows 1893 files in total for both install-dirs.
$ cd /opt ; du -s -m llvm-toolchain-3.8.0rc3_*
609 llvm-toolchain-3.8.0rc3_clang-compiled
864 llvm-toolchain-3.8.0rc3_gcc-compiled
$ LC_ALL=C wc -l ls-lR_*.txt
1893 ls-lR_clang-compiled.txt
1893 ls-lR_gcc-compiled.txt
3786 total
[ THE BAD (build-time) ]
Build-time increased approx. 1h from 2 to 3 hours when using CMAKE
instead of CONFIGURE/MAKE (logs deleted for LLVM v3.8.0rc2).
Building always done with one single parallel-compile-jobs.
When using CMAKE $COMPILER does not matter, it's approx. 3 hours build-time.
$ cat statistics/3.8.0rc3*/build*.txt
-rw-r--r-- 1 wearefam wearefam 138872 Feb 25 10:25
logs/3.8.0rc3_clang-compiled/install-log_llvm-toolchain-3.8.0rc3.txt
-rw-r--r-- 1 wearefam wearefam 216544 Feb 25 10:22
logs/3.8.0rc3_clang-compiled/build-log_llvm-toolchain-3.8.0rc3.txt
-rw-r--r-- 1 wearefam wearefam 14476 Feb 25 07:29
logs/3.8.0rc3_clang-compiled/configure-log_llvm-toolchain-3.8.0rc3.txt
-rw-r--r-- 1 wearefam wearefam 138872 Feb 24 18:55
logs/3.8.0rc3_gcc-compiled/install-log_llvm-toolchain-3.8.0rc3.txt
-rw-r--r-- 1 wearefam wearefam 344202 Feb 24 18:45
logs/3.8.0rc3_gcc-compiled/build-log_llvm-toolchain-3.8.0rc3.txt
-rw-r--r-- 1 wearefam wearefam 14295 Feb 24 15:53
logs/3.8.0rc3_gcc-compiled/configure-log_llvm-toolchain-3.8.0rc3.txt
[ AND THE UGLY ]
/me or my attached build-script?
I have not tried NINJA with CMAKE v3.x in combinations with
parallel-compile-jobs >=1.
My Samsung Ultrabook should do 5 compile-jobs in parallel.
Hope this helps a bit.
Regards,
- Sedat -
[1] The Good, the Bad and the Ugly - Wikipedia
build_llvm-toolchain.sh (3.74 KB)