linux下make用法

1.查看make的帮助，输入如下命令：

make -h

显示如下：

Usage: make [options] [target] ...
Options:-b, -m                      Ignored for compatibility.-B, --always-make           Unconditionally make all targets.-C DIRECTORY, --directory=DIRECTORYChange to DIRECTORY before doing anything.-d                          Print lots of debugging information.--debug[=FLAGS]             Print various types of debugging information.-e, --environment-overridesEnvironment variables override makefiles.--eval=STRING               Evaluate STRING as a makefile statement.-f FILE, --file=FILE, --makefile=FILERead FILE as a makefile.-h, --help                  Print this message and exit.-i, --ignore-errors         Ignore errors from recipes.-I DIRECTORY, --include-dir=DIRECTORYSearch DIRECTORY for included makefiles.-j [N], --jobs[=N]          Allow N jobs at once; infinite jobs with no arg.-k, --keep-going            Keep going when some targets can't be made.-l [N], --load-average[=N], --max-load[=N]Don't start multiple jobs unless load is below N.-L, --check-symlink-times   Use the latest mtime between symlinks and target.-n, --just-print, --dry-run, --reconDon't actually run any recipe; just print them.-o FILE, --old-file=FILE, --assume-old=FILEConsider FILE to be very old and don't remake it.-O[TYPE], --output-sync[=TYPE]Synchronize output of parallel jobs by TYPE.-p, --print-data-base       Print make's internal database.-q, --question              Run no recipe; exit status says if up to date.-r, --no-builtin-rules      Disable the built-in implicit rules.-R, --no-builtin-variables  Disable the built-in variable settings.-s, --silent, --quiet       Don't echo recipes.-S, --no-keep-going, --stopTurns off -k.-t, --touch                 Touch targets instead of remaking them.--trace                     Print tracing information.-v, --version               Print the version number of make and exit.-w, --print-directory       Print the current directory.--no-print-directory        Turn off -w, even if it was turned on implicitly.-W FILE, --what-if=FILE, --new-file=FILE, --assume-new=FILEConsider FILE to be infinitely new.--warn-undefined-variables  Warn when an undefined variable is referenced.This program built for x86_64-pc-linux-gnu
Report bugs to <bug-make@gnu.org>

2.查看参数-j的含义，是使用多核执行编译，-j后添加核的个数，如果-j后面不写数字，那么使用计算机的全部核进行编译。

make -j

make -j 1

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