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docs: compiling: Add a note about use of CFLAGS for optimization

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Meson doesn't interpret what's set in CFLAGS, but rather simply appeds
it to the command line. Thus any logic which is based on the
optimization level will not work.

Note the caveat in the docs and instruct users to use
``--optimization=N`` instead.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Peter Krempa 2023-09-04 12:09:11 +02:00
parent ead76d2ac7
commit 0152aa5673
1 changed files with 5 additions and 0 deletions
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docs/compiling.rst
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@ -112,6 +112,11 @@ Please ensure that you have the appropriate minimal ``meson`` version installed
in your build environment. The minimal version for a specific package can be in your build environment. The minimal version for a specific package can be
checked in the top level ``meson.build`` file in the ``meson_version`` field. checked in the top level ``meson.build`` file in the ``meson_version`` field.
**DO NOT** use the ``CFLAGS`` environment variable to set optimizations
(e.g. ``CFLAGS=-O0``), but rather use Meson's ``--optimization=0`` option.
Certain internal build options are based on the configured optimization value
and Meson does not interpret ``CFLAGS``.
Compiling the sources Compiling the sources
--------------------- ---------------------