Target Analysis

[xq114]

你在什么场景下需要该功能？

https://gn.googlesource.com/gn/+/master/docs/reference.md#commands-gn-desc-examples

gn 的 desc 功能可以展示一个target的sources/headers/deps/links/syslinks，以及cflags/cxxflags/defines/ldflags来源在哪里（gn desc <outdir> <target> <property> --blame）。这个功能在debug的时候非常方便，希望xmake也能加入这个功能。

描述可能的解决方案

提供一个xmake desc的action，由于xmake不需要显式声明buildir，可以设计语法如下：

> xmake desc
// print all targets
> xmake desc <target>
// print target overview
> xmake desc <target> cflags
// print cflags for a target
> xmake desc <target> cflags --blame
// print where each cflag comes from

描述你认为的候选方案

No response

其他信息

xmake使用过程中的一半问题都与不知道从哪里来的flag有关（cmake等也是如此）。这一功能大大增强了debug能力，也使得xmake后续开发过程中更容易定位问题，值得考虑。

[waruqi]

有 xmake show -t targetname ，目前提供了部分信息，暂时没有 cflags 而已，后期增强下就行。

不过近期没啥时间，等后面有时间了再说。

[waruqi]

改进过了，没必要搞这么多参数，仅仅只需要 xmake show -t target 就能显示所有 target 配置的信息和位置。。

$ xmake show -t tbox
The information of target(tbox):
    at: /Users/ruki/projects/personal/tbox/src/tbox/xmake.lua
    kind: static
    targetfile: build/macosx/x86_64/release/libtbox.a
    rules:
      -> mode.release -> ./xmake.lua:26
      -> mode.debug -> ./xmake.lua:26
      -> mode.profile -> ./xmake.lua:26
      -> mode.coverage -> ./xmake.lua:26
      -> utils.install.cmake_importfiles -> ./src/tbox/xmake.lua:15
      -> utils.install.pkgconfig_importfiles -> ./src/tbox/xmake.lua:16
    options:
      -> info -> ./src/tbox/xmake.lua:50
      -> float -> ./src/tbox/xmake.lua:50
      -> wchar -> ./src/tbox/xmake.lua:50
      -> exception -> ./src/tbox/xmake.lua:50
      -> force-utf8 -> ./src/tbox/xmake.lua:50
      -> deprecated -> ./src/tbox/xmake.lua:50
      -> xml -> ./src/tbox/xmake.lua:53
      -> zip -> ./src/tbox/xmake.lua:53
      -> hash -> ./src/tbox/xmake.lua:53
      -> regex -> ./src/tbox/xmake.lua:53
      -> coroutine -> ./src/tbox/xmake.lua:53
      -> object -> ./src/tbox/xmake.lua:53
      -> charset -> ./src/tbox/xmake.lua:53
      -> database -> ./src/tbox/xmake.lua:53
    packages:
      -> mbedtls -> ./src/tbox/xmake.lua:43
      -> polarssl -> ./src/tbox/xmake.lua:43
      -> openssl -> ./src/tbox/xmake.lua:43
      -> pcre2 -> ./src/tbox/xmake.lua:43
      -> pcre -> ./src/tbox/xmake.lua:43
      -> zlib -> ./src/tbox/xmake.lua:43
      -> mysql -> ./src/tbox/xmake.lua:43
      -> sqlite3 -> ./src/tbox/xmake.lua:43
    links:
      -> pthread -> option(__keyword_thread_local) -> @programdir/includes/check_csnippets.lua:100
    syslinks:
      -> pthread -> ./xmake.lua:71
      -> dl -> ./xmake.lua:71
      -> m -> ./xmake.lua:71
      -> c -> ./xmake.lua:71
    defines:
      -> __tb_small__ -> ./xmake.lua:42
      -> __tb_prefix__="tbox" -> ./src/tbox/xmake.lua:19
      -> _GNU_SOURCE=1 -> option(__systemv_semget) -> @programdir/includes/check_cfuncs.lua:104
    cxflags:
      -> -Wno-error=deprecated-declarations -> ./xmake.lua:22
      -> -fno-strict-aliasing -> ./xmake.lua:22
      -> -Wno-error=expansion-to-defined -> ./xmake.lua:22
      -> -fno-stack-protector -> ./xmake.lua:51
    frameworks:
      -> CoreFoundation -> ./src/tbox/xmake.lua:38
      -> CoreServices -> ./src/tbox/xmake.lua:38
    mxflags:
      -> -Wno-error=deprecated-declarations -> ./xmake.lua:23
      -> -fno-strict-aliasing -> ./xmake.lua:23
      -> -Wno-error=expansion-to-defined -> ./xmake.lua:23
    includedirs:
      -> src -> ./src/tbox/xmake.lua:26
      -> build/macosx/x86_64/release -> ./src/tbox/xmake.lua:27
    headerfiles:
      -> src/(tbox/**.h)|**/impl/**.h -> ./src/tbox/xmake.lua:30
      -> src/(tbox/prefix/**/prefix.S) -> ./src/tbox/xmake.lua:31
      -> src/(tbox/math/impl/*.h) -> ./src/tbox/xmake.lua:32
      -> src/(tbox/utils/impl/*.h) -> ./src/tbox/xmake.lua:33
      -> build/macosx/x86_64/release/tbox.config.h -> ./src/tbox/xmake.lua:34
    files:
      -> src/tbox/*.c -> ./src/tbox/xmake.lua:56
      -> src/tbox/hash/bkdr.c -> ./src/tbox/xmake.lua:57
      -> src/tbox/hash/fnv32.c -> ./src/tbox/xmake.lua:57
      -> src/tbox/hash/adler32.c -> ./src/tbox/xmake.lua:57
      -> src/tbox/math/**.c -> ./src/tbox/xmake.lua:58
      -> src/tbox/libc/**.c|string/impl/**.c -> ./src/tbox/xmake.lua:59
      -> src/tbox/utils/*.c|option.c -> ./src/tbox/xmake.lua:60
      -> src/tbox/prefix/**.c -> ./src/tbox/xmake.lua:61
      -> src/tbox/memory/**.c -> ./src/tbox/xmake.lua:62
      -> src/tbox/string/**.c -> ./src/tbox/xmake.lua:63
      -> src/tbox/stream/**.c|**/charset.c|**/zip.c -> ./src/tbox/xmake.lua:64
      -> src/tbox/network/**.c|impl/ssl/*.c -> ./src/tbox/xmake.lua:65
      -> src/tbox/algorithm/**.c -> ./src/tbox/xmake.lua:66
      -> src/tbox/container/**.c|element/obj.c -> ./src/tbox/xmake.lua:67
      -> src/tbox/libm/impl/libm.c -> ./src/tbox/xmake.lua:68
      -> src/tbox/libm/idivi8.c -> ./src/tbox/xmake.lua:73
      -> src/tbox/libm/ilog2i.c -> ./src/tbox/xmake.lua:70
      -> src/tbox/libm/isqrti.c -> ./src/tbox/xmake.lua:71
      -> src/tbox/libm/isqrti64.c -> ./src/tbox/xmake.lua:72
      -> src/tbox/platform/*.c|context.c|exception.c -> ./src/tbox/xmake.lua:74
      -> src/tbox/platform/impl/*.c|charset.c|poller_fwatcher.c -> ./src/tbox/xmake.lua:74
      -> src/tbox/libm/*.c -> ./src/tbox/xmake.lua:77
    compiler (cc): /usr/bin/xcrun -sdk macosx clang
      -> -Qunused-arguments -target x86_64-apple-macos12.6 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.0.sdk
    linker (ar): /usr/bin/xcrun -sdk macosx ar
      -> -cr
    compflags (cc):
      -> -Qunused-arguments -target x86_64-apple-macos12.6 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.0.sdk -Wall -Werror -Oz -std=c99 -Isrc -Ibuild/macosx/x86_64/release -D__tb_small__ -D__tb_prefix__=\"tbox\" -D_GNU_SOURCE=1 -framework CoreFoundation -framework CoreServices -Wno-error=deprecated-declarations -fno-strict-aliasing -Wno-error=expansion-to-defined -fno-stack-protector
    linkflags (ar):
      -> -cr