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<p style="margin: 0px 0px 1.2em !important;">On 31/07/2024 16:09,
Maurizio Cimadamore wrote:</p>
<p style="margin: 0px 0px 1.2em !important;"></p>
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<blockquote type="cite" cite="mid:c6dcfc86-4393-41ce-9984-9d7b6c193082@oracle.com">This
is not helpful I agree - seems to be coming somewhere deep in
libclang. I wonder if it's related to the parsing of the
compile_flags.txt itself...</blockquote>
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<p style="margin: 0px 0px 1.2em !important;">I’ve tried adding a
compile_flags.txt as follows:</p>
<pre style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">-xc++
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">And this seems to
work as expected for simple files containing a single
prototype-less function declaration (e.g. jextract generates
binding for a 0-arity function).</p>
<p style="margin: 0px 0px 1.2em !important;">I’ve tried extracting
OpenGL with this flag, and I started running into issues, as
jextract started to see unsupported C++ constructs (such as
“using”). Not sure where these came from (probably from standard
library headers, as the headers for OpenGL don’t seem to have
any “using” directive inside them).</p>
<p style="margin: 0px 0px 1.2em !important;">But the error I got
was something more specific (not just ASTReadError). Adding some
hacks and workaround to jextract eventually allowed me to get to
a full extraction.</p>
<p style="margin: 0px 0px 1.2em !important;">I then tried tweaking
the compile_flags.txt as follows:</p>
<pre style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">-x c++
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">(note the extra
space).</p>
<p style="margin: 0px 0px 1.2em !important;">And bam, even for
simple examples it fails like this:</p>
<pre style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">fatal: Unexpected exception org.openjdk.jextract.clang.Index$ParsingFailedException: Failed to parse jextract$tmp.h: ASTReadError occurred
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">Which is, I think,
what you saw. If that’s your issue you could try dropping the
extra space. My (failed) attempts with OpenGL leave me somewhat
skeptical that this solution truly works.</p>
<p style="margin: 0px 0px 1.2em !important;">Maurizio</p>
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