When writing custom development tools, exactly how should error
messages be formatted,
so that XCode can parse and display them?
a) error/warning messages produced by a custom build rule are never
picked up properly by Xcode (rdar://problem/4343667)
b) error/warning messages produced by a "Run Script" phase are picked
up by Xcode if they conform to gcc's error/warning message
formatting, although the exact regex they have to conform to is not
public. This means that you have to watch out when giving more info
than gcc -- e.g., we also give the column in which the error occurs,
but the extra colon resulting from that seemed to break Xcode's
parsing (so now I replace that colon with a dash).
Basically, I create a dummy target which contains all the source
files. In the custom build rule for my source files I write out the
file names of all these files to a temporary file. Then, in the main
target (which is dependent on this dummy target), I have a Run Script
phase which reads these file names back from that temporary file and
does the actual compilation (so error messages are picked up by Xcode).
Note that the Run Script phase only compiles to assembler and not to
object code. In the same main target with the Run Script phase, there
is also a "custom build rule" for the Pascal source files which does
nothing, but sets the output file to "$(PROJECT_DERIVED_FILE_DIR)/$
(INPUT_FILE_BASE).s" (which has been produced during the preceding
Run Script phase already). Xcode will then do the assembling for you.
The reason is that Xcode will only link in object files is allowed to
assemble itself. If you do it yourself and specify an object file as
output, Xcode ignores it (didn't file a bug for that yet).
You can probably ignore the "fpcrtl" target from those templates; it
just creates a static library from all installed Run Time Library
object files for Xcode to be able to link it in easily.
Jonas
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