Adding the Arduino repo as a git submodule can be very useful for version control. However, `git submodule update` is not enough, as the tools need to be downloaded through `get.py`. Wrapping the main code in that script into its own function allows an external Python script to import the module and execute its functionality without relying on the unsafe `execfile` (or `Popen`). The main advantage would be easy flow control in case of error (eg: issue #4464).
* Move to PROGMEM aware libc, allow PSTR in printf()
A Newlib (libc) patch is in progress to move the _P functions from inside
Arduino into first-class citizens in libc. This Arduino patch cleans up
code that's been migrated there. Binaries for the new libs are included
because it seems they're part of the Arduino git tree, and should be
replaced with @igrr built ones when/if the Newlib changes are accepted.
Notable changes/additions for Arduino:
Allow for use of PROGMEM based format and parameter strings in all
*printf functions. No need for copying PSTR()s into RAM before printing
them out (transparently saves heap space when using _P functions) and
makes it easier to print out constant strings for applications.
Add "%S" (capital-S) format that I've been told, but cannot verify,
is used in Arduino to specify a PROGMEM string parameter in printfs,
as an alias for "%s" since plain "%s" can now handle PROGMEM.
Optimized the memcpy_P, strnlen_P, and strncpy_P functions to use 32-bit
direct reads whenver possible (source and dest alignment mediated), but
there is still room for improvement in others.
Finally, move several constant arrays from RODATA into PROGMEM and
update their accessors. Among these are the ctype array, ~260 bytes,
mprec* arrays, ~300 bytes, and strings/daycounts in the time
formatting functions, ~200 bytes. All told, sketches will see from
300 to 800 additional RAM heap free on startup (depending on their
use of these routines).
* Fix merge error in #ifdef/#endif
* Fix host test using the newlib generic pgmspace.h
Host tests now use the sys/pgmspace.h for compiles instead of the
ESP8266-specific version.
* Update with rebuilt libraries using latest newlib
* Include binaries built directly from @igrr repo
Rebuild the binaries using a git clone of
https://github.com/igrr/newlib-xtensa
Build commands for posterity:
````
rm -rf ./xtensa-lx106-elf/
./configure --prefix=<DIR>/esp8266/tools/sdk/libc --with-newlib \
--enable-multilib --disable-newlib-io-c99-formats \
--disable-newlib-supplied-syscalls \
--enable-newlib-nano-formatted-io --enable-newlib-reent-small \
--enable-target-optspace \
--program-transform-name="s&^&xtensa-lx106-elf-&" \
--disable-option-checking --with-target-subdir=xtensa-lx106-elf \
--target=xtensa-lx106-elf
rm -f etc/config.cache
CROSS_CFLAGS="-fno-omit-frame-pointer -DSIGNAL_PROVIDED -DABORT_PROVIDED"\
" -DMALLOC_PROVIDED" \
PATH=<DIR>/esp8266/tools/xtensa-lx106-elf/bin/:$PATH \
make all install
````
* Fix merge define conflict in c_types.h
* Fix strlen_P misaligned source error
Include fix from newlib-xtensa/fix-strlen branch cleaning up misaligned
access on a non-aligned source string.
* Fix strlen_P and strcpy_P edge cases
Ran the included test suite on ESP8266 tstring.c with the following defines:
#define MAX_1 50
#define memcmp memcmp_P
#define memcpy memcpy_P
#define memmem memmem_P
#define memchr memchr_P
#define strcat strcat_P
#define strncat strncat_P
#define strcpy strcpy_P
#define strlen strlen_P
#define strnlen strnlen_P
#define strcmp strcmp_P
#define strncmp strncmp_P
Uncovered edge case and return value problems in the optimized versions of
the strnlen_P and strncpy_P functions. Corrected.
* Fix memcpy_P return value
memcpy-1.c test suite showed error in return value of memcpy_P. Correct it.
* Fix strnlen_P/strlen_P off-by-4 error
Random crashes, often on String constructors using a PSTR, would occur due
to the accelerated strnlen_P going past the end of the string. Would make
debug builds fail, too (ESP.getVersionString() failure).
Fix to fall through to normal copy on a word that's got a 0 byte anywhere
in it.
* Add device tests for libc functional verification
Add test suite used to debug libc optimized _P functions to the device
tests.
* Rebuild from igrr's repo (same source as prior)
Rebuild .a from igrr's repo at 347260af117b4177389e69fd4d04169b11d87a97
* WIP - add exceptions
* Fix exception to have 0-terminator
* Move some exception constants to TEXT from RODATA
* Remove throw stubs
* Move more exception stuff to ROM
* Enable exceptions in platform.io
* Remove atexit, is duplicated in rebuilt lib
Need to look at the quick-toolchain options, there seems to be a definition
for atexit defined there (libgcc?) that needs to be excised. For now,
remove our local do-nothing copy.
* Update libgcc to remove soft-fp functions
The esp-quick-toolchain generated libgcc.a needed to have the soft-FP routines
that are in ROM removed from it. Remove them in the new esp-quick-toolchain
and update.
* Fix merge typos in Makefile
* Add unhandled exception handler to postmortem
* Return our atexit() handler
* Latest stdc++, minimize exception emercengy area
* Remove atexit from newlib
atexit was defined in newlib strongly, but we also define a noop atexit in core.
Since we never exit, use the core's noop and delete the atexit from libc.a
Updated in esp-quick-toolchain as well.
* Move __FUNCTION__ static strings to PROGMEM
__FUNCTION__ is unlikely to be a timing sensitive variable, so move it to
PROGMEM and not RODATA (RAM) using linker magic.
asserts() now should take no RAM for any strings.
* Clean up linker file, update to latest stdc++
* Update to latest stdc++ which doesn't call strerror
* Update to GCC5.1 exception emergency allocator
Using GCC 5.1's emergency memory allocator for exceptions, much less
space is required in programs which do not use exceptions and when
space is allocated it is managed more efficiently.
* Initial try with new compiler toolchain
* Include newlib built from esp-quick-toolchain
* Update JSON with all new esp-quick-toolchain builds
* Use 64bit Windows compiler on 64bit Windows
* Dump std::exception.what() when possible
When doing the panic on unhandled exceptions, try and grab the
.what() pointer and dump it as part of the termination info.
Makes it easy to see mem errors (std::bad_alloc) or std::runtime_error
strings.
* Use scripted install from esp-quick-toolchain
Makes sure proper libraries and includes are present by using a
scripted installation from esp-quick-install instead of a manual
one.
* Update eqk to remove atexit, fix packaging diff
