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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/chris">Chris Johns</a>
commented on a
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5252#note_122977">discussion</a>:
</p>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Each BSP built has its own environment that defines the settings etc used in the build. Waf supports deriving an environment from the base, adding the specific settings a BSP needs and then queuing the builds.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">I think the environment is created <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/wscript?ref_type=heads#L1528" style="margin-top: 0;">here</a> and it seems items in the environment can be macros of some form expanded and played with <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/wscript?ref_type=heads#L120">here</a> and other places. You can see the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>env</code> being populated after being created:</p>
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<pre data-canonical-lang="python" class="code highlight js-syntax-highlight language-python" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="python" style="margin-top: 0;"> <span class="n" style="margin-top: 0;">conf</span><span class="p">.</span><span class="n">env</span><span class="p">[</span><span class="sh">"</span><span class="s">ARCH</span><span class="sh">"</span><span class="p">]</span> <span class="o">=</span> <span class="n">arch</span></span>
<span id="LC2" class="line" lang="python"> <span class="n" style="margin-top: 0;">conf</span><span class="p">.</span><span class="n">env</span><span class="p">[</span><span class="sh">"</span><span class="s">ARCH_BSP</span><span class="sh">"</span><span class="p">]</span> <span class="o">=</span> <span class="n">arch_bsp</span></span>
<span id="LC3" class="line" lang="python"> <span class="n" style="margin-top: 0;">conf</span><span class="p">.</span><span class="n">env</span><span class="p">[</span><span class="sh">"</span><span class="s">ARCH_FAMILY</span><span class="sh">"</span><span class="p">]</span> <span class="o">=</span> <span class="n">arch_family</span></span>
<span id="LC4" class="line" lang="python"> <span class="n" style="margin-top: 0;">conf</span><span class="p">.</span><span class="n">env</span><span class="p">[</span><span class="sh">"</span><span class="s">BSP_BASE</span><span class="sh">"</span><span class="p">]</span> <span class="o">=</span> <span class="n">bsp_base</span></span>
<span id="LC5" class="line" lang="python"> <span class="n" style="margin-top: 0;">conf</span><span class="p">.</span><span class="n">env</span><span class="p">[</span><span class="sh">"</span><span class="s">BSP_NAME</span><span class="sh">"</span><span class="p">]</span> <span class="o">=</span> <span class="n">bsp_name</span></span>
<span id="LC6" class="line" lang="python"> <span class="n" style="margin-top: 0;">conf</span><span class="p">.</span><span class="n">env</span><span class="p">[</span><span class="sh">"</span><span class="s">BSP_FAMILY</span><span class="sh">"</span><span class="p">]</span> <span class="o">=</span> <span class="n">family</span></span>
<span id="LC7" class="line" lang="python"> <span class="n" style="margin-top: 0;">conf</span><span class="p">.</span><span class="n">env</span><span class="p">[</span><span class="sh">"</span><span class="s">DEST_OS</span><span class="sh">"</span><span class="p">]</span> <span class="o">=</span> <span class="sh">"</span><span class="s">rtems</span><span class="sh">"</span></span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">As an aside <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>rtems_waf</code> uses the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>waf</code> provided <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>derive()</code> call to get an environment <a href="https://gitlab.rtems.org/rtems/tools/rtems_waf/-/blob/main/rtems.py?ref_type=heads#L208">here</a>. The call in the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>rtems.git</code> <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>wscript</code> may currently equate to the same thing but I followed the existing <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>waf</code> examples at the time.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">The BSP build item context is constructed <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/wscript?ref_type=heads#L689" style="margin-top: 0;">here</a> and just below is the build context for the library items. The adds the build item to the build queue which I believe is per BSP. If you had a print to show those items and the number of sources you can see the builds for <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>csb336</code> bsp:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">[] bsp item 14</span>
<span id="LC2" class="line" lang="plaintext">[] library item 8</span>
<span id="LC3" class="line" lang="plaintext">[] library item 2</span>
<span id="LC4" class="line" lang="plaintext">[] library item 1</span>
<span id="LC5" class="line" lang="plaintext">[] library item 19</span>
<span id="LC6" class="line" lang="plaintext">[] library item 1</span>
<span id="LC7" class="line" lang="plaintext">[] library item 1101</span>
<span id="LC8" class="line" lang="plaintext">[] library item 2</span>
<span id="LC9" class="line" lang="plaintext">[] library item 1</span>
<span id="LC10" class="line" lang="plaintext">[] library item 32</span>
<span id="LC11" class="line" lang="plaintext">[] library item 5</span>
<span id="LC12" class="line" lang="plaintext">[] library item 2</span>
<span id="LC13" class="line" lang="plaintext">[] library item 15</span>
<span id="LC14" class="line" lang="plaintext">[] library item 3</span>
<span id="LC15" class="line" lang="plaintext">[] library item 2</span>
<span id="LC16" class="line" lang="plaintext">[] library item 2</span>
<span id="LC17" class="line" lang="plaintext">[] library item 2</span>
<span id="LC18" class="line" lang="plaintext">[] library item 2</span>
<span id="LC19" class="line" lang="plaintext">[] library item 3</span>
<span id="LC20" class="line" lang="plaintext">[] library item 913</span>
<span id="LC21" class="line" lang="plaintext">[] library item 4</span>
<span id="LC22" class="line" lang="plaintext">[] library item 11</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Only the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>csb366</code> items are in the build queue which makes sense because it is specific the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>env</code> for that BSP.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">You can see <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>waf</code> move through the different environments when the banners of `Waf: Entering directory..` and <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>Waf: Leaving directory...</code> lines are printed.</p>
<p dir="auto" style="color: #28272d; margin: 0;" align="initial">I suppose to get the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>-k</code> to move across BSPs the fatal error of the BSP build would need to be trapped and passed over. Sorry, I have no idea how to do that.</p>
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