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Document the use of -Wl,z,lazy

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Florian Weimer 2018-02-24 21:46:59 +01:00
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buildflags.md
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@ -72,6 +72,17 @@ It is possible to set RPM macros to change some aspects of the
compiler flags. Changing these flags should be used as a last compiler flags. Changing these flags should be used as a last
recourse if other workarunds are not available. recourse if other workarunds are not available.
### Lazy binding
If your package depends on the semantics of lazy binding (e.g., it has
plugins which load additional plugins to complete their dependencies,
before which some referenced functions are undefined), you should put
`-Wl,-z,lazy` at the end of the `LDFLAGS` setting when linking objects
which have such requirements. Under these circumstances, it is
unnecessary to disable hardened builds (and thus lose full ASLR for
executables), or link everything without `-Wl,z,now` (non-lazy
binding).
### Hardened builds ### Hardened builds
By default, the build flags enable fully hardened builds. To change By default, the build flags enable fully hardened builds. To change