Provide the linux-i686 build for the esp32ulp-elf "Toolchain for ESP32 ULP coprocessor" (IDFGH-10302)

[usr97629238]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

v4.4.4

Operating System used.

Linux

How did you build your project?

Command line with idf.py

If you are using Windows, please specify command line type.

None

What is the expected behavior?

esp32ulp-elf https://github.com/espressif/binutils-gdb and https://github.com/espressif/esp-idf/blob/master/tools/tools.json provide the esp32ulp-elf build for linux-i686

What is the actual behavior?

ERROR: tool esp32ulp-elf does not have versions compatible with platform linux-i686

Steps to reproduce.

1. Install esp-idf on linux-i686
2. Run ./install.sh esp32

Build or installation Logs.

Detecting the Python interpreter
Checking "python" ...
Checking "python3" ...
Python 3.7.3
"python3" has been detected
Installing ESP-IDF tools
Current system platform: linux-i686
Selected targets are: esp32, esp32c3
Installing tools: xtensa-esp-elf-gdb, xtensa-esp32-elf, esp32ulp-elf
Skipping xtensa-esp-elf-gdb@11.2_20220823 (already installed)
Skipping xtensa-esp32-elf@esp-2021r2-patch5-8.4.0 (already installed)
ERROR: tool esp32ulp-elf does not have versions compatible with platform linux-i686

More Information.

Please provide the linux-i686 build for the esp32ulp-elf https://github.com/espressif/binutils-gdb, and update the https://github.com/espressif/esp-idf/blob/master/tools/tools.json accordingly.
Or at least provide the clear config/make configuration to build it.
Strangely, all the tools in the toolkit have their linux-i686 version except for this.

Trying to build it myself, there are numerous issues:

• injecting the link into the $HOME/esp/esp-idf/tools/tools.json (would be gone after an update)
• the build configuration isn't provided with the release https://github.com/espressif/binutils-gdb/releases/tag/esp32ulp-elf-v2.35_20220830, there are some hints here pre-compiled 32bit linux binutils wanted binutils-esp32ulp#1 and there Compilation Error binutils-esp32ulp#19, but they are incomplete, cause despite building it from the release source https://github.com/espressif/binutils-gdb/releases/tag/esp32ulp-elf-v2.35_20220830 (and not from the head) the resulting files differ from the released by espressif
• and now I'm stuck at the . $HOME/esp/esp-idf/export.sh:

Adding ESP-IDF tools to PATH...
WARNING: tool esp32ulp-elf version 2.35_20220830 is installed, but has reported version Copyright
ERROR: tool esp32ulp-elf has no installed versions. Please run '/home/user/esp/esp-idf/install.sh' to install it. 

As the built file's output lacks the version printout:
./esp32ulp-elf-as --version

GNU assembler (GNU Binutils)
Copyright (C) 2020 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `esp32ulp-elf'.

While the version check in the script $HOME/esp/esp-idf/tools/idf_tools.py awaits something along the lines of:

GNU assembler (crosstool-NG esp-2021r2-patch5) 2.35.1.20201223
Copyright (C) 2020 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `riscv32-esp-elf'.

And that requires either hacking the $HOME/esp/esp-idf/tools/idf_tools.py to override this check or finding out how to enable the version printout in that "trillion lines of code" binutils' source.

[usr97629238]

The lack of a linux-i686 build for one tool in the toolkit is a bug, not a feature request.

[Lapshin]

@usr97629238 , thank you for bug report. This will be done with the next release.

To build the toolchain by yourself you can use the command (replace gcc with yours if need):

./configure \
  --host=`gcc -dumpmachine`\
  --target=esp32ulp-elf \
  --prefix="${INSTALL_DIR}" \
  --disable-doc --disable-gdb --disable-libdecnumber --disable-readline --disable-sim
make
make install

Also, see the build routine here https://github.com/espressif/binutils-gdb/blob/esp32ulp-elf-v2.35_20220830/.gitlab-ci.yml#L131

[antmak]

Hi @usr97629238. Thank you, fixed. A fix will be in master, v4.4 and other branches soon.

The i686 distribution has been added to the release https://github.com/espressif/binutils-gdb/releases/tag/esp32ulp-elf-v2.35_20220830
An IDF fix

diff --git a/tools/tools.json b/tools/tools.json
index 612b9353d8..43079c09fa 100644
--- a/tools/tools.json
+++ b/tools/tools.json
@@ -542,6 +542,11 @@
             "size": 9591791,
             "url": "https://github.com/espressif/binutils-gdb/releases/download/esp32ulp-elf-v2.35_20220830/esp32ulp-elf-2.35_20220830-linux-armhf.tar.gz"
           },
+          "linux-i686": {
+            "sha256": "beb9b6737c975369b6959007739c88f44eb5afbb220f40737071540b2c1a9064",
+            "size": 10596533,
+            "url": "https://github.com/espressif/binutils-gdb/releases/download/esp32ulp-elf-v2.35_20220830/esp32ulp-elf-2.35_20220830-linux-i686.tar.gz"
+          },
           "macos": {
             "sha256": "5a952087b621ced16af1e375feac1371a61cb51ab7e7b44cbefb5afda2d573de",
             "size": 16028909,