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buildflags.md: Mention optional -fcommon under compiler flags

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From Fedora commit ac57cc99aa.

Related: #2005080
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Florian Weimer 2021-11-15 15:26:05 +01:00
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buildflags.md
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@ -235,6 +235,8 @@ The general (architecture-independent) build flags are:
* `-grecord-gcc-switches`: Include select GCC command line switches in * `-grecord-gcc-switches`: Include select GCC command line switches in
the DWARF debugging information. This is useful for detecting the the DWARF debugging information. This is useful for detecting the
presence of certain build flags and general hardening coverage. presence of certain build flags and general hardening coverage.
* `-fcommon`: This optional flag is used to build legacy software
which relies on C tentative definitions. It is disabled by default.
For hardened builds (which are enabled by default, see above for how For hardened builds (which are enabled by default, see above for how
to disable them), the flag to disable them), the flag