CentOS 7.x Beta Branch Testing GCC 7.1/7.2 & Clang 4.0.1 SCL Yum Packages

Been testing Centmin Mod 123.09beta01 compatibility with Clang 4 and Clang 5 via source compiled versions. Centmin Mod 123.09beta01 already supports Nginx and PHP compiles via GCC 4.4-4.8, 5.3, 6.2 and Clang 3.4. And was waiting on GCC 7 for testing via devtoolset-7.

But source compiles can take hours to compile i.e. E3-1270v1 @3.5-3.8Ghz took ~67 minutes to compile both Clang 4 + 5 and i7 4790K @4.0-4.4Ghz took ~47 minutes for both. However, it looks like CentOS/RHEL SCL collections are working on building SCL for llvm-toolset YUM repo for Clang/LLVM 4.0.1 final release as well as devtoolset-7's GCC 7.1 which llvm-toolset requires for Clang 4.0.1. Great news as it means I can start working on Nginx and PHP-FPM compiles against both Clang 4.0.1 and GCC 7.1 provided via respective llvm-toolset SCL and devtoolset-7 packages

More info at Summer 2017 GNU Toolchain Update

On test server running Centmin Mod 123.09beta01 + CentOS 7.3 64bit.

---

GCC 7.1

Code (Text):

/opt/rh/devtoolset-7/root/usr/bin/gcc --version
gcc (GCC) 7.1.1 20170526 (Red Hat 7.1.1-2)
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang 4.0.1 built against devtoolset-7's GCC 7.1

Code (Text):

/opt/rh/llvm-toolset-7/root/usr/bin/clang -v
clang version 4.0.1 (tags/RELEASE_401/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/rh/llvm-toolset-7/root/usr/bin
Found candidate GCC installation: /opt/rh/devtoolset-4/root/usr/lib/gcc/x86_64-redhat-linux/5.3.1
Found candidate GCC installation: /opt/rh/devtoolset-6/root/usr/lib/gcc/x86_64-redhat-linux/6.2.1
Found candidate GCC installation: /opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.5
Selected GCC installation: /opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64

Code (Text):

yum history info 44
Loaded plugins: fastestmirror, priorities, versionlock
Transaction ID : 44
Begin time     : Sat Sep  9 08:07:52 2017
Begin rpmdb    : 622:72f5791d1ace56ec1c7fc0585b53eed17c87a710
End time       :            08:08:12 2017 (20 seconds)
End rpmdb      : 634:04f6af77654d07b5033a7378c47e53625bf7cce2
User           : root <root>
Return-Code    : Success
Command Line   : localinstall devtoolset-7-binutils-2.28-7.el7.x86_64.rpm devtoolset-7-libstdc++-devel-7.1.1-2.1.el7.x86_64.rpm devtoolset-7-gcc-7.1.1-2.1.el7.x86_64.rpm devtoolset-7-gcc-c++-7.1.1-2.1.el7.x86_64.rpm llvm-toolset-7-clang-4.0.1-1.el7.x86_64.rpm llvm-toolset-7-llvm-libs-4.0.1-3.el7.x86_64.rpm llvm-toolset-7-llvm-static-4.0.1-3.el7.x86_64.rpm llvm-toolset-7-compiler-rt-4.0.1-1.el7.x86_64.rpm llvm-toolset-7-libomp-4.0.1-1.el7.x86_64.rpm llvm-toolset-7-clang-libs-4.0.1-1.el7.x86_64.rpm
Transaction performed with:
   Installed     rpm-4.11.3-21.el7.x86_64                      @base
   Installed     yum-3.4.3-150.el7.centos.noarch               @base
   Installed     yum-metadata-parser-1.1.4-10.el7.x86_64       installed
   Installed     yum-plugin-fastestmirror-1.1.31-40.el7.noarch @base
   Installed     yum-plugin-versionlock-1.1.31-40.el7.noarch   @base
Packages Altered:
   Install     devtoolset-7-binutils-2.28-7.el7.x86_64           @/devtoolset-7-binutils-2.28-7.el7.x86_64
   Install     devtoolset-7-gcc-7.1.1-2.1.el7.x86_64             @/devtoolset-7-gcc-7.1.1-2.1.el7.x86_64
   Install     devtoolset-7-gcc-c++-7.1.1-2.1.el7.x86_64         @/devtoolset-7-gcc-c++-7.1.1-2.1.el7.x86_64
   Install     devtoolset-7-libstdc++-devel-7.1.1-2.1.el7.x86_64 @/devtoolset-7-libstdc++-devel-7.1.1-2.1.el7.x86_64
   Dep-Install devtoolset-7-runtime-7.0-5.el7.x86_64             @centos-sclo-rh
   Install     llvm-toolset-7-clang-4.0.1-1.el7.x86_64           @/llvm-toolset-7-clang-4.0.1-1.el7.x86_64
   Install     llvm-toolset-7-clang-libs-4.0.1-1.el7.x86_64      @/llvm-toolset-7-clang-libs-4.0.1-1.el7.x86_64
   Install     llvm-toolset-7-compiler-rt-4.0.1-1.el7.x86_64     @/llvm-toolset-7-compiler-rt-4.0.1-1.el7.x86_64
   Install     llvm-toolset-7-libomp-4.0.1-1.el7.x86_64          @/llvm-toolset-7-libomp-4.0.1-1.el7.x86_64
   Install     llvm-toolset-7-llvm-libs-4.0.1-3.el7.x86_64       @/llvm-toolset-7-llvm-libs-4.0.1-3.el7.x86_64
   Install     llvm-toolset-7-llvm-static-4.0.1-3.el7.x86_64     @/llvm-toolset-7-llvm-static-4.0.1-3.el7.x86_64
   Dep-Install llvm-toolset-7-runtime-4.0.1-1.el7.x86_64         @centos-sclo-rh
Scriptlet output:
   1 libsemanage.semanage_read_policydb: Could not open kernel policy /etc/selinux/targeted/active/policy.kern for reading. (No such file or directory).
   2 OSError: No such file or directory
history info

 

Nginx Compiled Clang 4.0.1

Testing 123.09beta01's Nginx 1.13.5 compile against llvm-toolset-7's Clang 4.0.1

Compared with source installed Clang 5.0 final release tests here.

 

Nginx Compiled GCC 7.1

Testing 123.09beta01's Nginx 1.13.5 compile against devtoolset-7's GCC 7.1.1 however seems it failed at set-misc-nginx-module compile section.

Code (Text):

nginx configure options (alternate ordering):
./configure --with-ld-opt="-ljemalloc -Wl,-z,relro -Wl,-rpath,/usr/local/lib" --with-cc-opt="-m64 -march=native -g -O3 -fstack-protector-strong -flto -fuse-ld=gold --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wno-deprecated-declarations -gsplit-dwarf" --sbin-path=/usr/local/sbin/nginx --conf-path=/usr/local/nginx/conf/nginx.conf --with-compat --with-http_stub_status_module --with-http_secure_link_module --with-libatomic --with-http_gzip_static_module --add-dynamic-module=../ngx_brotli --with-http_sub_module --with-http_addition_module --with-http_image_filter_module=dynamic --with-http_geoip_module=dynamic --with-stream_geoip_module --with-stream_realip_module --with-stream_ssl_preread_module --with-threads --with-stream=dynamic --with-stream_ssl_module --with-http_realip_module --add-dynamic-module=../ngx-fancyindex-0.4.0 --add-module=../ngx_cache_purge-2.3 --add-module=../ngx_devel_kit-0.3.0 --add-dynamic-module=../set-misc-nginx-module-0.31 --add-dynamic-module=../echo-nginx-module-0.61 --add-dynamic-module=../redis2-nginx-module-0.14 --add-module=../ngx_http_redis-0.3.7 --add-dynamic-module=../memc-nginx-module-0.18 --add-dynamic-module=../srcache-nginx-module-0.31 --add-dynamic-module=../headers-more-nginx-module-0.32 --with-pcre=../pcre-8.41 --with-pcre-jit --with-zlib=../zlib-1.2.11 --with-http_ssl_module --with-http_v2_module --with-openssl=../openssl-1.1.0f --with-openssl-opt='enable-ec_nistp_64_gcc_128'
checking for OS
 + Linux 2.6.32-042stab120.19 x86_64
checking for C compiler ... found
 + using GNU C compiler
 + gcc version: 7.1.1 20170526 (Red Hat 7.1.1-2) (GCC)
checking for gcc -pipe switch ... found
checking for --with-ld-opt="-ljemalloc -Wl,-z,relro -Wl,-rpath,/usr/local/lib" ... found
checking for -Wl,-E switch ... found
checking for gcc builtin atomic operations ... found
checking for C99 variadic macros ... found
checking for gcc variadic macros ... found
checking for gcc builtin 64 bit byteswap ... found
checking for unistd.h ... found
checking for inttypes.h ... found
checking for limits.h ... found
checking for sys/filio.h ... not found
checking for sys/param.h ... found
checking for sys/mount.h ... found
checking for sys/statvfs.h ... found
checking for crypt.h ... found
checking for Linux specific features
checking for epoll ... found
checking for EPOLLRDHUP ... found
checking for EPOLLEXCLUSIVE ... not found
checking for O_PATH ... found
checking for sendfile() ... found
checking for sendfile64() ... found
checking for sys/prctl.h ... found
checking for prctl(PR_SET_DUMPABLE) ... found
checking for crypt_r() ... found
checking for sys/vfs.h ... found
checking for nobody group ... found
checking for poll() ... found
checking for /dev/poll ... not found
checking for kqueue ... not found
checking for crypt() ... not found
checking for crypt() in libcrypt ... found
checking for F_READAHEAD ... not found
checking for posix_fadvise() ... found
checking for O_DIRECT ... found
checking for F_NOCACHE ... not found
checking for directio() ... not found
checking for statfs() ... found
checking for statvfs() ... found
checking for dlopen() ... not found
checking for dlopen() in libdl ... found
checking for sched_yield() ... found
checking for sched_setaffinity() ... found
checking for SO_SETFIB ... not found
checking for SO_REUSEPORT ... found
checking for SO_ACCEPTFILTER ... not found
checking for SO_BINDANY ... not found
checking for IP_BIND_ADDRESS_NO_PORT ... not found
checking for IP_TRANSPARENT ... found
checking for IP_BINDANY ... not found
checking for IP_RECVDSTADDR ... not found
checking for IP_SENDSRCADDR ... not found
checking for IP_PKTINFO ... found
checking for IPV6_RECVPKTINFO ... found
checking for TCP_DEFER_ACCEPT ... found
checking for TCP_KEEPIDLE ... found
checking for TCP_FASTOPEN ... found
checking for TCP_INFO ... found
checking for accept4() ... found
checking for eventfd() ... found
checking for int size ... 4 bytes
checking for long size ... 8 bytes
checking for long long size ... 8 bytes
checking for void * size ... 8 bytes
checking for uint32_t ... found
checking for uint64_t ... found
checking for sig_atomic_t ... found
checking for sig_atomic_t size ... 4 bytes
checking for socklen_t ... found
checking for in_addr_t ... found
checking for in_port_t ... found
checking for rlim_t ... found
checking for uintptr_t ... uintptr_t found
checking for system byte ordering ... little endian
checking for size_t size ... 8 bytes
checking for off_t size ... 8 bytes
checking for time_t size ... 8 bytes
checking for AF_INET6 ... found
checking for setproctitle() ... not found
checking for pread() ... found
checking for pwrite() ... found
checking for pwritev() ... found
checking for sys_nerr ... found
checking for localtime_r() ... found
checking for posix_memalign() ... found
checking for memalign() ... found
checking for mmap(MAP_ANON|MAP_SHARED) ... found
checking for mmap("/dev/zero", MAP_SHARED) ... found
checking for System V shared memory ... found
checking for POSIX semaphores ... not found
checking for POSIX semaphores in libpthread ... found
checking for struct msghdr.msg_control ... found
checking for ioctl(FIONBIO) ... found
checking for struct tm.tm_gmtoff ... found
checking for struct dirent.d_namlen ... not found
checking for struct dirent.d_type ... found
checking for sysconf(_SC_NPROCESSORS_ONLN) ... found
checking for openat(), fstatat() ... found
checking for getaddrinfo() ... found
configuring additional modules
adding module in ../ngx_cache_purge-2.3
 + ngx_http_cache_purge_module was configured
adding module in ../ngx_devel_kit-0.3.0
 + ngx_devel_kit was configured
adding module in ../ngx_http_redis-0.3.7
 + ngx_http_redis_module was configured
configuring additional dynamic modules
adding module in ../ngx_brotli
 + ngx_brotli was configured
adding module in ../ngx-fancyindex-0.4.0
 + ngx_http_fancyindex_module was configured
adding module in ../set-misc-nginx-module-0.31
found ngx_devel_kit for ngx_set_misc; looks good.
 + ngx_http_set_misc_module was configured
adding module in ../echo-nginx-module-0.61
 + ngx_http_echo_module was configured
adding module in ../redis2-nginx-module-0.14
 + ngx_http_redis2_module was configured
adding module in ../memc-nginx-module-0.18
 + ngx_http_memc_module was configured
adding module in ../srcache-nginx-module-0.31
 + ngx_http_srcache_filter_module was configured
adding module in ../headers-more-nginx-module-0.32
 + ngx_http_headers_more_filter_module was configured
checking for GD library ... found
checking for GD WebP support ... not found
checking for GeoIP library ... found
checking for GeoIP IPv6 support ... found
checking for atomic_ops library ... found
creating objs/Makefile

Configuration summary
  + using threads
  + using PCRE library: ../pcre-8.41
  + using OpenSSL library: ../openssl-1.1.0f
  + using zlib library: ../zlib-1.2.11
  + using system libatomic_ops library

  nginx path prefix: "/usr/local/nginx"
  nginx binary file: "/usr/local/sbin/nginx"
  nginx modules path: "/usr/local/nginx/modules"
  nginx configuration prefix: "/usr/local/nginx/conf"
  nginx configuration file: "/usr/local/nginx/conf/nginx.conf"
  nginx pid file: "/usr/local/nginx/logs/nginx.pid"
  nginx error log file: "/usr/local/nginx/logs/error.log"
  nginx http access log file: "/usr/local/nginx/logs/access.log"
  nginx http client request body temporary files: "client_body_temp"
  nginx http proxy temporary files: "proxy_temp"
  nginx http fastcgi temporary files: "fastcgi_temp"
  nginx http uwsgi temporary files: "uwsgi_temp"
  nginx http scgi temporary files: "scgi_temp"

Sat Sep  9 08:50:47 UTC 2017
Success: Nginx configure ok

errors

Code (Text):

ccache gcc -c -fPIC -pipe  -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -m64 -march=native -g -O3 -fstack-protector-strong -flto -fuse-ld=gold --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wno-deprecated-declarations -gsplit-dwarf -Wno-deprecated-declarations -DNDK_SET_VAR -DNDK_UPSTREAM_LIST -I src/core -I src/event -I src/event/modules -I src/os/unix -I ../ngx_devel_kit-0.3.0/objs -I objs/addon/ndk -I ../ngx_brotli/deps/brotli/include -I ../pcre-8.41 -I ../openssl-1.1.0f/.openssl/include -I ../zlib-1.2.11 -I objs -I src/http -I src/http/modules -I src/http/v2 -I ../ngx_devel_kit-0.3.0/src -I ../ngx_devel_kit-0.3.0/src -I ../ngx_devel_kit-0.3.0/objs -I objs/addon/ndk -I src/stream \
        -o objs/addon/src/ngx_http_set_misc_module.o \
        ../set-misc-nginx-module-0.31/src/ngx_http_set_misc_module.c
../set-misc-nginx-module-0.31/src/ngx_http_set_quote_sql.c: In function 'ngx_http_pg_utf_islegal':
../set-misc-nginx-module-0.31/src/ngx_http_set_quote_sql.c:98:20: error: this statement may fall through [-Werror=implicit-fallthrough=]
                 if (a < 0x80 || a > 0xBF)
                    ^
../set-misc-nginx-module-0.31/src/ngx_http_set_quote_sql.c:100:13: note: here
             case 3:
             ^~~~
../set-misc-nginx-module-0.31/src/ngx_http_set_quote_sql.c:102:20: error: this statement may fall through [-Werror=implicit-fallthrough=]
                 if (a < 0x80 || a > 0xBF)
                    ^
../set-misc-nginx-module-0.31/src/ngx_http_set_quote_sql.c:104:13: note: here
             case 2:
             ^~~~
cc1: all warnings being treated as errors
make[1]: *** [objs/addon/src/ngx_http_set_quote_sql.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory `/svr-setup/nginx-1.13.5'
make: *** [build] Error 2

related to GCC 7's -Werror=implicit-fallthrough -Wimplicit-fallthrough in GCC 7

Retested with fixed workaround for GCC 7.1 results in Nginx 1.13.5 compiling successfully

 

Compiler Benchmark Reviews

Just to highlight how the pairing of particular cpu and GCC or Clang compilers can change and improve performance for software (i.e. for Centmin Mod Nginx and PHP-FPM), here's some reviews and benchmarks

• For GCC 7
• For GCC 6
• For Clang 4
• For Clang 5
• For Clang 6

Comparisons

• Keeping The Ryzen Threadripper Busy With An Array Of Compiler Benchmarks - Phoronix
• More Benchmarks Of AMD's Threadripper With LLVM Clang 6.0 SVN - Phoronix (result page)
• Ryzen Compiler Performance: Clang 4/5 vs. GCC 6/7/8 Benchmarks - Phoronix
• Intel's Clear Linux Switches Over To GCC 7 Compiler - Phoronix (result page)

 

GCC 7.2.1 Test

Testing Centmin Mod 123.09beta01 and Nginx compiled with updated GCC 7.2.1

Code (Text):

/opt/rh/devtoolset-7/root/usr/bin/gcc --version
gcc (GCC) 7.2.1 20170829 (Red Hat 7.2.1-1)
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

with LibreSSL 2.5.5

with OpenSSL 1.1.0g

 

Centmin Mod 123.09beta01 updated with GCC 7.2.1 & Clang 4.0.1 support for CentOS 7.x systems https://community.centminmod.com/posts/56087/

 

Besides GCC 7 and Clang 4.0.1, also testing out GCC 8 and Clang 5.0.1 and Clang 6.0.0