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Diffstat (limited to 'docs/markdown/Builtin-options.md')
| -rw-r--r-- | docs/markdown/Builtin-options.md | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/docs/markdown/Builtin-options.md b/docs/markdown/Builtin-options.md index aa7d500..0fa127a 100644 --- a/docs/markdown/Builtin-options.md +++ b/docs/markdown/Builtin-options.md @@ -55,16 +55,9 @@ particularly the paths section may be necessary. ### Core options -Options that are labeled "per machine" in the table are set per machine. -Prefixing the option with `build.` just affects the build machine configuration, -while unprefixed just affects the host machine configuration, respectively. -Using the option as-is with no prefix affects all machines. For example: - - - `build.pkg_config_path` controls the paths pkg-config will search for just - `native: true` dependencies (build machine). - - - `pkg_config_path` controls the paths pkg-config will search for just - `native: false` dependencies (host machine). +Options that are labeled "per machine" in the table are set per machine. See +the [specifying options per machine](#Specifying-options-per-machine) section +for details. | Option | Default value | Description | Is per machine | | ------ | ------------- | ----------- | -------------- | @@ -186,9 +179,9 @@ The default values of `c_winlibs` and `cpp_winlibs` are in compiler-specific argument forms, but the libraries are: kernel32, user32, gdi32, winspool, shell32, ole32, oleaut32, uuid, comdlg32, advapi32. -c_args, cpp_args, c_link_args, and cpp_link_args only affect native builds, -when cross compiling they will not be applied to binaries or libraries -targeting the host system, only those being run on the build system. +All these `<lang>_*` options are specified per machine. See below in the +[specifying options per machine](#Specifying-options-per-machine) section on +how to do this in cross builds. When using MSVC, `cpp_eh=none` will result in no exception flags being passed, while the `cpp_eh=[value]` will result in `/EH[value]`. @@ -199,3 +192,25 @@ gcc-style compilers, nothing is passed (allowing exceptions to work), while Since *0.54.0* The `<lang>_thread_count` option can be used to control the value passed to `-s PTHREAD_POOL_SIZE` when using emcc. No other c/c++ compiler supports this option. + +## Specifying options per machine + +Since *0.51.0*, some options are specified per machine rather than globally for +all machine configurations. Prefixing the option with `build.` just affects the +build machine configuration, while unprefixed just affects the host machine +configuration, respectively. For example: + + - `build.pkg_config_path` controls the paths pkg-config will search for just + `native: true` dependencies (build machine). + + - `pkg_config_path` controls the paths pkg-config will search for just + `native: false` dependencies (host machine). + +This is useful for cross builds. In the native builds, build = host, and the +unprefixed option alone will suffice. + +Prior to *0.51.0*, these options just effected native builds when specified on +the command line, as there was no `build.` prefix. Similarly named fields in +the `[properties]` section of the cross file would effect cross compilers, but +the code paths were fairly different allowing differences in behavior to crop +out. |