Add support for LLVM 19

[aykevl]

This is incomplete. I've only made this so that we have a LLVM 19 branch ready to go once LLVM 19 is released (and the Xtensa fork has been rebased).

I will make a new PR once it is ready.

Some things that need to be resolved:

• LLVM 19 needs to be released (probably early September)
• Homebrew needs to be updated (see WIP use LLVM 19 go-llvm#65 and llvm 19.1.0 Homebrew/homebrew-core#181351)
• libLLVM-19.so is a broken symbolic link llvm/llvm-project#105987 needs to be fixed, or we need to use a hacky workaround.
• The Xtensa fork needs to be rebased (though we can probably have partial LLVM 19 support before then for distro maintainers).

[github-actions]

Size difference with the dev branch:

Binary size difference

not the same command! tinygo build -size short -o ./build/test.bin -target=m5stamp-c3 ./examples/ws2812 '-xesppie' is not a recognized feature for this target (ignoring feature) flash ram before after diff before after diff 263712 263408 -304 -0.12% 46748 46748 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/slideshow 67932 67668 -264 -0.39% 6360 6360 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/gps/i2c/main.go 68468 68212 -256 -0.37% 6504 6504 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/gps/uart/main.go 75640 75448 -192 -0.25% 7448 7448 0 0.00% tinygo build -size short -o ./build/test.hex -target=p1am-100 ./examples/p1am/main.go 27224 27104 -120 -0.44% 3632 3632 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/microbitmatrix/main.go 26144 26032 -112 -0.43% 16412 16412 0 0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/waveshare-epd/epd2in66b/main.go 68656 68560 -96 -0.14% 6188 6188 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp2515/main.go 57532 57436 -96 -0.17% 3692 3692 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht4x/main.go 16720 16636 -84 -0.50% 4172 4172 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650 69768 69688 -80 -0.11% 6368 6368 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/ds3231/main.go 14808 14732 -76 -0.51% 6580 6580 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/hts221/main.go 69304 69232 -72 -0.10% 6968 6968 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/flash/console/spi 64012 63948 -64 -0.10% 6196 6196 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmi160/main.go 64072 64008 -64 -0.10% 6228 6228 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp280/main.go 26556 26492 -64 -0.24% 2328 2328 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/lsm303agr/main.go 10880 10820 -60 -0.55% 3340 3340 0 0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/touch/capacitive 14152 14096 -56 -0.40% 6580 6580 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/lps22hb/main.go 24752 24696 -56 -0.23% 13720 13720 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840-sense ./examples/waveshare-epd/epd1in54/main.go 11884 11836 -48 -0.40% 6580 6580 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/apds9960/proximity/main.go 8372 8324 -48 -0.57% 3344 3344 0 0.00% tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/sram/main.go 13792 13744 -48 -0.35% 3400 3400 0 0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/sgp30 27836 27796 -40 -0.14% 4780 4780 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp180/main.go 22300 22260 -40 -0.18% 3540 3540 0 0.00% tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/time/main.go 10740 10700 -40 -0.37% 4540 4540 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-bluefruit ./examples/tone 61472 61440 -32 -0.05% 6180 6180 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adt7410/main.go 12264 12236 -28 -0.23% 3352 3352 0 0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/pca9685/main.go 10552 10524 -28 -0.27% 3328 3328 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/seesaw 12596 12568 -28 -0.22% 6976 6976 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/pyportal_touchpaint/main.go 57448 57424 -24 -0.04% 3684 3684 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/shtc3/main.go 6788 6764 -24 -0.35% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7735/main.go 6176 6152 -24 -0.39% 2312 2312 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd2in13x/main.go 32280 32256 -24 -0.07% 4780 4780 0 0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bme280/main.go 57476 57460 -16 -0.03% 3684 3684 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht3x/main.go 13568 13560 -8 -0.06% 6788 6788 0 0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx 26944 26936 -8 -0.03% 5680 5680 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit-v2 ./examples/microbitmatrix/main.go 6700 6692 -8 -0.12% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7789/main.go 5260 5256 -4 -0.08% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setpixel/main.go 4620 4620 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/easystepper/main.go 5832 5832 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hd44780/customchar/main.go 5784 5784 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hd44780/text/main.go 6228 6228 0 0.00% 3288 3288 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setbuffer/main.go 2841 2841 0 0.00% 558 558 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino ./examples/servo 5844 5844 0 0.00% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1331/main.go 6488 6488 0 0.00% 2320 2320 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd2in13/main.go 6400 6400 0 0.00% 2320 2320 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd4in2/main.go 1581 1581 0 0.00% 598 598 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino ./examples/ws2812 1056 1056 0 0.00% 180 180 0 0.00% tinygo build -size short -o ./build/test.hex -target=digispark ./examples/ws2812 16148 16152 4 0.02% 2360 2360 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hub75/main.go 6140 6144 4 0.07% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1306/spi_128x64/main.go 8368 8376 8 0.10% 2320 2320 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/at24cx/main.go 10372 10380 8 0.08% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017-multiple/main.go 6688 6696 8 0.12% 2288 2288 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1306/i2c_128x32/main.go 5764 5772 8 0.14% 9522 9522 0 0.00% tinygo build -size short -o ./build/test.bin -target=m5stamp-c3 ./examples/ws2812 7212 7224 12 0.17% 2280 2280 0 0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/gc9a01/main.go 10744 10756 12 0.11% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mag3110/main.go 9920 9932 12 0.12% 4780 4780 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017/main.go 12448 12476 28 0.22% 4788 4788 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/lsm6ds3/main.go 9568 9600 32 0.33% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adxl345/main.go 7432 7464 32 0.43% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/blinkm/main.go 12200 12232 32 0.26% 4812 4812 0 0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bmp388/main.go 10528 10560 32 0.30% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/hd44780i2c/main.go 11732 11764 32 0.27% 4780 4780 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis3dh/main.go 8240 8272 32 0.39% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mma8653/main.go 8148 8180 32 0.39% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mpu6050/main.go 15336 15368 32 0.21% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/vl53l1x/main.go 13816 13848 32 0.23% 4748 4748 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/vl6180x/main.go 8124 8160 36 0.44% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bh1750/main.go 70632 70688 56 0.08% 3660 3660 0 0.00% tinygo build -size short -o ./build/test.hex -target=pinetime ./examples/bma42x/main.go 29508 29588 80 0.27% 38076 38076 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/pyportal_boing 62644 62732 88 0.14% 5952 5952 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840 ./examples/is31fl3731/main.go 10152 10252 100 0.99% 6916 6916 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/basic 9524 9624 100 1.05% 6780 6780 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/fourwire/main.go 10172 10276 104 1.02% 6916 6916 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/scroll 8080 8188 108 1.34% 6788 6788 0 0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/shifter/main.go 65644 65756 112 0.17% 9004 9004 0 0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/flash/console/qspi 9760 9888 128 1.31% 4752 4752 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/itsybitsy-m0/main.go 10644 10776 132 1.24% 4868 4868 0 0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/basic 10732 10864 132 1.23% 4868 4868 0 0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/scroll 8680 8816 136 1.57% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/main.go 7872 8008 136 1.73% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/hcsr04/main.go 9780 9916 136 1.39% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp3008/main.go 6848 6984 136 1.99% 4780 4780 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/ws2812 17396 17536 140 0.80% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/thermistor/main.go 10064 10204 140 1.39% 4740 4740 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/tm1637/main.go 2038514 2038270 -244 0.00% 472394 472394 0 0.00% 

[deadprogram]

LLVM 19 is out and the default for homebrew installs: https://formulae.brew.sh/formula/llvm

[aykevl]

Yes. But it should continue to work, if people install LLVM as brew install llvm@18 (as IIRC it says in the documentation).

I can make a PR to support LLVM 19 for go install only if needed, but I'd prefer to do that only when needed (it is extra work to make and test). Instead, I'd prefer to wait until Espressif releases their LLVM 19 fork.

[QuLogic]

I noticed with lld 19 that several experimental flags warn that they don't exist and are being ignored. As this changes those to the non-prefixed versions, doesn't that mean that lld 18 will now warn that those don't exist and start ignoring them? In other words, don't we need some translation for -experimental--prefixed features between >=19 and <19?

[aykevl]

I noticed with lld 19 that several experimental flags warn that they don't exist and are being ignored. As this changes those to the non-prefixed versions, doesn't that mean that lld 18 will now warn that those don't exist and start ignoring them? In other words, don't we need some translation for -experimental--prefixed features between >=19 and <19?

These flags often change with LLVM releases, especially for RISC-V. So far it hasn't been breaking anything to use the flags of a different LLVM release, but the warnings are kinda ugly.
One solution would be to use a different set of flags for different LLVM versions, though I don't really like to maintain those. It's a solution though if needed.

(To be clear: these warnings only happen when using a LLVM version that's not the "primary"/latest supported LLVM version. Most users shouldn't see those).

[aykevl]

In other news, I've updated this PR since the Xtensa fork got updated with LLVM 19 support!

[deadprogram]

At last! Thanks for all the work on this @aykevl now merging.