problem with esp-idf 4.0 and assembler

[wevets]

I am in the process of converting a program to esp-idf 4.0. I have installed 4.0 according to the vanilla instructions.
While assembling a .S file with the following lines:

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1. 54     // Data segment
2. 55  .bss
3. 56  .global     LastReadHi      // Last reported read hi word

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In which I declare a pile of assembler variables,
And then the first few lines of the .text segment

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1. 110     // Code segment
2. 111   .text
3. 112   .global entry
4. 113 entry:

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immediately followed, with an intervening comment, by

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1. 124 // First count and report the number of times ULP has cycled
2. 125    move r3, ULPcycles
3. 126    ld       r0, r3, 0
4. 127    add  r0, r0, 1
5. 128    st       r0, r3, 0

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I get the following errors out of the assembler as invoked with a simple “idf.py build” command:

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1. P.S.obj.d -o esp-idf/ulp/CMakeFiles/__idf_ulp.dir/PartBinULP.S.obj -c ../components/ulp/PartBinULP.S
2. ../components/ulp/PartBinULP.S: Assembler messages:
3. ../components/ulp/PartBinULP.S:55: Error: unknown pseudo-op: `.bss'
4. ../components/ulp/PartBinULP.S:125: Error: unknown opcode or format name 'move'
5. ../components/ulp/PartBinULP.S:126: Error: unknown opcode or format name 'ld'
6. ../components/ulp/PartBinULP.S:127: Error: bad register name: r0
7. ../components/ulp/PartBinULP.S:127: Error: junk at end of line, first unrecognized character is `r'
8. ../components/ulp/PartBinULP.S:127: Internal error in ignore_rest_of_line at /builds/idf/crosstool-NG/.build/HOST-i686-w64-mingw32/xtensa-esp32-elf/src/binutils/gas/read.c:3762.
9. Please report this bug.

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It looks to me like the assembler is barfing over perfectly normal directives and mnemonics, which used to work with esp-idf 3.3 without error.

I’m seeing other problems as well as I migrate to 4.0, but I’d first like to resolve this.
Thanks.