Beta Branch add optional Clang 4.0 support for Nginx compiles in 123.09beta01

add optional Clang 4.0 support for Nginx compiles in 123.09beta01

For CentOS 7 where CLANG_FOUR='y' is set in persist config file at /etc/centminmod/custom_config.inc, will enable Clang 4.0 detection support. If custom Clang 4.0 binary is detected at /opt/sbin/llvm/bin/clang, and CLANG_FOUR='y set, then Nginx will compile with Clang 4.0 instead of Clang 3.4.2 when CLANG='y' is set (default). Details https://community.centminmod.com/posts/44039/

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123.09beta01 branch

• Branch: GitHub - centminmod/centminmod at 123.09beta01
• Commit History: https://github.com/centminmod/centminmod/commits/123.09beta01

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first attempt on Intel Core i7 4790K 4.0Ghz with 32GB Ram 2x 240GB SSD server took ~1,338 seconds = 22.3 minutes using raw clock speed

Code (Text):

/opt/sbin/llvm/bin/clang --version
clang version 4.0.0 (branches/release_40 293572)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/sbin/llvm/bin

Code (Text):

./llvm.sh

Code (Text):

ls -lahrt /root/centminlogs/ |grep llvm | tail -1
-rw-r--r--  1 root root 2.8M Jan 31 00:23 centminmod_llvm_310117-000105.log

Code (Text):

tail -1 /root/centminlogs/centminmod_llvm_310117-000105.log
Total LLVM 4 Build Time: 1338.368736902 seconds

Code (Text):

ls -lah /opt/sbin/llvm/bin/
total 738M
drwxr-xr-x 2 root root 4.0K Jan 31 00:23 .
drwxr-xr-x 7 root root 4.0K Jan 31 00:23 ..
-rwxr-xr-x 1 root root  16M Jan 31 00:18 bugpoint
-rwxr-xr-x 1 root root  18M Jan 31 00:23 c-index-test
lrwxrwxrwx 1 root root    9 Jan 31 00:23 clang -> clang-4.0
lrwxrwxrwx 1 root root    5 Jan 31 00:23 clang++ -> clang
-rwxr-xr-x 1 root root  74M Jan 31 00:22 clang-4.0
-rwxr-xr-x 1 root root 1.9M Jan 31 00:22 clang-apply-replacements
-rwxr-xr-x 1 root root  19M Jan 31 00:22 clang-change-namespace
-rwxr-xr-x 1 root root  54M Jan 31 00:22 clang-check
lrwxrwxrwx 1 root root    5 Jan 31 00:23 clang-cl -> clang
lrwxrwxrwx 1 root root    5 Jan 31 00:23 clang-cpp -> clang
-rwxr-xr-x 1 root root 2.1M Jan 31 00:12 clang-format
-rwxr-xr-x 1 root root  22M Jan 31 00:22 clang-import-test
-rwxr-xr-x 1 root root  18M Jan 31 00:18 clang-include-fixer
-rwxr-xr-x 1 root root 2.7M Jan 31 00:11 clang-offload-bundler
-rwxr-xr-x 1 root root  20M Jan 31 00:22 clang-query
-rwxr-xr-x 1 root root  18M Jan 31 00:22 clang-rename
-rwxr-xr-x 1 root root  18M Jan 31 00:22 clang-reorder-fields
-rwxr-xr-x 1 root root  26M Jan 31 00:22 clang-tidy
-rwxr-xr-x 1 root root  18M Jan 31 00:18 find-all-symbols
-rwxr-xr-x 1 root root  21K Jan 31 00:01 git-clang-format
-rwxr-xr-x 1 root root  38M Jan 31 00:22 llc
-rwxr-xr-x 1 root root  20M Jan 31 00:23 lli
-rwxr-xr-x 1 root root  13M Jan 31 00:22 llvm-ar
-rwxr-xr-x 1 root root 2.2M Jan 31 00:18 llvm-as
-rwxr-xr-x 1 root root 357K Jan 31 00:18 llvm-bcanalyzer
-rwxr-xr-x 1 root root 2.1M Jan 31 00:18 llvm-cat
-rwxr-xr-x 1 root root 139K Jan 31 00:03 llvm-config
-rwxr-xr-x 1 root root 2.9M Jan 31 00:18 llvm-cov
-rwxr-xr-x 1 root root  31M Jan 31 00:23 llvm-c-test
-rwxr-xr-x 1 root root 2.5M Jan 31 00:22 llvm-cxxdump
-rwxr-xr-x 1 root root 122K Jan 31 00:03 llvm-cxxfilt
-rwxr-xr-x 1 root root 2.0M Jan 31 00:18 llvm-diff
-rwxr-xr-x 1 root root 1.7M Jan 31 00:18 llvm-dis
-rwxr-xr-x 1 root root  31M Jan 31 00:22 llvm-dsymutil
-rwxr-xr-x 1 root root 2.7M Jan 31 00:18 llvm-dwarfdump
-rwxr-xr-x 1 root root  30M Jan 31 00:23 llvm-dwp
-rwxr-xr-x 1 root root 3.0M Jan 31 00:18 llvm-extract
lrwxrwxrwx 1 root root    7 Jan 31 00:23 llvm-lib -> llvm-ar
-rwxr-xr-x 1 root root 2.9M Jan 31 00:18 llvm-link
-rwxr-xr-x 1 root root  38M Jan 31 00:22 llvm-lto
-rwxr-xr-x 1 root root  39M Jan 31 00:23 llvm-lto2
-rwxr-xr-x 1 root root  15M Jan 31 00:22 llvm-mc
-rwxr-xr-x 1 root root 294K Jan 31 00:03 llvm-mcmarkup
-rwxr-xr-x 1 root root 1.8M Jan 31 00:18 llvm-modextract
-rwxr-xr-x 1 root root  14M Jan 31 00:22 llvm-nm
-rwxr-xr-x 1 root root  14M Jan 31 00:22 llvm-objdump
-rwxr-xr-x 1 root root 378K Jan 31 00:18 llvm-opt-report
-rwxr-xr-x 1 root root 1.4M Jan 31 00:18 llvm-pdbdump
-rwxr-xr-x 1 root root 1.1M Jan 31 00:07 llvm-profdata
lrwxrwxrwx 1 root root    7 Jan 31 00:23 llvm-ranlib -> llvm-ar
-rwxr-xr-x 1 root root 3.6M Jan 31 00:18 llvm-readobj
-rwxr-xr-x 1 root root  12M Jan 31 00:23 llvm-rtdyld
-rwxr-xr-x 1 root root 2.5M Jan 31 00:18 llvm-size
-rwxr-xr-x 1 root root 2.4M Jan 31 00:18 llvm-split
-rwxr-xr-x 1 root root 3.0M Jan 31 00:18 llvm-stress
-rwxr-xr-x 1 root root 282K Jan 31 00:18 llvm-strings
-rwxr-xr-x 1 root root 2.8M Jan 31 00:18 llvm-symbolizer
-rwxr-xr-x 1 root root 2.1M Jan 31 00:03 llvm-tblgen
-rwxr-xr-x 1 root root 2.9M Jan 31 00:23 llvm-xray
-rwxr-xr-x 1 root root  18M Jan 31 00:17 modularize
-rwxr-xr-x 1 root root 3.0M Jan 31 00:18 obj2yaml
-rwxr-xr-x 1 root root  44M Jan 31 00:23 opt
-rwxr-xr-x 1 root root  13M Jan 31 00:22 sancov
-rwxr-xr-x 1 root root 2.6M Jan 31 00:18 sanstats
-rwxr-xr-x 1 root root  53K Jan 31 00:01 scan-build
-rwxr-xr-x 1 root root 4.4K Jan 31 00:01 scan-view
-rwxr-xr-x 1 root root 2.4M Jan 31 00:18 verify-uselistorder
-rwxr-xr-x 1 root root 769K Jan 31 00:18 yaml2obj

Clang 4.0 without ccache as first time compile seems to compile Nginx ~10-15 seconds faster than GCC at ~75 seconds. So is it worth the 1,338+ seconds compile time ?