AppleClang has several incompatibilities with __attribute__((weak,
alias)) that prevent sane GCC-like usage on macOS:
- it does not support __attribute__((alias)) at all, only the #pragma
weak symbol1 = symbol2 syntax [1]
- the compiler removes unused static functions prior to aliasing, which
renders the above into an error [2].
To fix this, I implemented weak aliasing using the #pragma directive and
the recommended indirection macros from the GCC docs [3] and removing
the static inline specifiers from the functions if building under macOS.
Fixes#1204
[1]: See, for instance, https://sourceforge.net/p/openocd/tickets/304/
and Google "error: aliases are not supported on darwin".
[2]: https://bugs.llvm.org/show_bug.cgi?id=17775
[3]: https://gcc.gnu.org/onlinedocs/cpp/Pragmas.html
SAM4L added a DEBUG_INFO command that uses insufficiently-specific formatting.
This breaks compiles on ESP32.
Use specific formatters. Additionally, ensure that FLASHCALW_BASE is
defined as a long int, which allows it to be formatted with "%x".
Signed-off-by: Sean Cross <sean@xobs.io>
This commit removes the previous tdesc_cortex_a, tdesc_cortex_m, and
tdesc_cortex_mf XML string literals used for target description to GDB,
now instead programmatically generating them at runtime to significantly
deduplicate the characters that get embedded into the binary.
Output of ld's --print-memory-usage during final link before:
Memory region Used Size Region Size %age Used
rom: 116388 B 128 KB 88.80%
ram: 3348 B 20 KB 16.35%
Output of ld's --print-memory-usage during final link now:
Memory region Used Size Region Size %age Used
rom: 113032 B 128 KB 86.24%
ram: 3376 B 20 KB 16.48%
So all in all this saves 3356 bytes of flash.
Note: the exact size saved when compiled on your machine may differ, as
the size of the build seems at least partially non-deterministic.
We've gotten slightly different sizes (within 15 bytes of each other)
at different times, with the only differences being things like which
files were rebuilt in an incremental rebuild, or the order object files
were given to the linker command line. The numbers given above were the
numbers we got when testing the final builds from scratch, but all the
sizes we got were extremely similar to the sizes listed above.
Rafael Silva
dragonmux
L. E. Segovia
Sean Cross
Mikaela Szekely