depends: Do not consider `CC` environment variable for detecting system

hebasto commented at 7:01 pm on April 25, 2024: member

On the master branch @ 3c88eac28e8984893746caebb313dc3b2fca90db, consider the following commands in the depends subdirectory:

0$ make print-build HOST=i686-pc-linux-gnu CC="clang -m32"
1build=x86_64-pc-linux-gnu
2$ make print-host HOST=i686-pc-linux-gnu CC="clang -m32"
3host=i686-pc-linux-gnu

The printed variable values are expected.

However, switching the CC variable context from Makefile to the shell environment breaks expectations:

0$ CC="clang -m32" make print-build HOST=i686-pc-linux-gnu
1build=i686-pc-linux-gnu
2$ CC="clang -m32" make print-host HOST=i686-pc-linux-gnu
3host=i686-pc-linux-gnu

This PR fixes this issue.

UPDATE 2026-01-20

On the master branch @ 7f5ebef56a0f2bad7df30252b11da3e33cb3c144:

0$ gmake print-build HOST=i686-pc-linux-gnu CC="clang -m32"
1build=i686-pc-linux-gnu
2$ gmake print-host HOST=i686-pc-linux-gnu CC="clang -m32"
3host=i686-pc-linux-gnu

hebasto added the label Build system on Apr 25, 2024

DrahtBot commented at 7:01 pm on April 25, 2024: contributor

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/29963.

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Conflicts

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hebasto referenced this in commit 370c4e9161 on Apr 25, 2024

theuni commented at 7:20 pm on April 25, 2024: member

Where/why is this an issue?

hebasto referenced this in commit 727cc73bcc on Apr 25, 2024

hebasto commented at 7:27 pm on April 25, 2024: member

Where/why is this an issue?

I faced this issue during my work on the CMake staging branch when the CC environment variable was defined by the CI – https://github.com/hebasto/bitcoin/actions/runs/8822538616/job/24220973382.

The log shows no cross-compiling, but it is cross-compiling to i686-pc-linux-gnu.

theuni commented at 9:01 pm on April 25, 2024: member

Surely this isn’t the only place env vars like this would cause issues? Feels like a cat-and-mouse game.

maflcko commented at 8:11 am on April 26, 2024: member

The log shows no cross-compiling, but it is cross-compiling to i686-pc-linux-gnu.

Can you link to the exact lines in the log that show “no cross-compiling”.

hebasto commented at 9:29 am on April 26, 2024: member

The log shows no cross-compiling, but it is cross-compiling to i686-pc-linux-gnu.

Can you link to the exact lines in the log that show “no cross-compiling”.

https://github.com/hebasto/bitcoin/actions/runs/8822538616/job/24220973382#step:14:245:

0Cross compiling ....................... FALSE

Please note that that was a PR branch from the CMake migration project. That branch detects cross-compiling basing on host and build values when building with depends.

fanquake commented at 9:51 am on April 26, 2024: member

Surely this isn’t the only place env vars like this would cause issues? Feels like a cat-and-mouse game.

Yea, as-is this doesn’t seem like a great fix, and may just break other things?

A better diff might be something like:

 0diff --git a/depends/Makefile b/depends/Makefile
 1index 005d9696fb..091511758d 100644
 2--- a/depends/Makefile
 3+++ b/depends/Makefile
 4@@ -51,7 +51,7 @@ FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources
 5 C_STANDARD ?= c11
 6 CXX_STANDARD ?= c++20
 7 
 8-BUILD = $(shell ./config.guess)
 9+BUILD = $(shell CC_FOR_BUILD=$CC ./config.guess)
10 HOST ?= $(BUILD)
11 PATCHES_PATH = $(BASEDIR)/patches
12 BASEDIR = $(CURDIR)

which would at least be using the option that is meant to be used for this.

hebasto force-pushed on Apr 26, 2024

hebasto commented at 10:05 am on April 26, 2024: member

A better diff might be something like: … which would at least be using the option that is meant to be used for this.

I agree. Implemented.

Thanks!

hebasto renamed this:
~~depends: Do not consider `CC` environment variable for detecting system~~
depends: Use `CC_FOR_BUILD` for `config.guess `
on Apr 26, 2024

theuni commented at 12:47 pm on April 26, 2024: member

However, switching the CC variable context from Makefile to the shell environment breaks expectations

Arguably that’s because this wasn’t intended to be supported :)

I suppose this fix is reasonable, though supporting env vars like this seems quite brittle.

hebasto referenced this in commit 21bee57cb6 on Apr 30, 2024

hebasto referenced this in commit 516ecf1c8e on May 2, 2024

hebasto referenced this in commit 729632c54f on May 2, 2024

fanquake commented at 3:37 pm on May 31, 2024: member

Is this still an issue given recent CMake changes?

hebasto commented at 10:10 am on June 3, 2024: member

Is this still an issue given recent CMake changes?

Yes. Tested with the master branch @ 80bdd4b6beb878c95478b5623c9f9ff0b948ad57.

And this PR still fixes it.

DrahtBot added the label CI failed on Jun 18, 2024

DrahtBot removed the label CI failed on Jun 18, 2024

DrahtBot added the label CI failed on Sep 10, 2024

DrahtBot removed the label CI failed on Sep 14, 2024

achow101 requested review from fanquake on Oct 15, 2024

achow101 requested review from theuni on Oct 15, 2024

fanquake commented at 4:03 pm on October 24, 2024: member

@hebasto can you rebase this?

hebasto force-pushed on Oct 24, 2024

hebasto commented at 4:08 pm on October 24, 2024: member

@hebasto can you rebase this?

Rebased.

fanquake added the label DrahtBot Guix build requested on Oct 24, 2024

DrahtBot commented at 9:54 am on October 25, 2024: contributor

Guix builds (on x86_64) [untrusted test-only build, possibly unsafe, not for production use]

File	commit 74fb19317aec6d5156e12da6be63e59e0cc99770(master)	commit 8cf6a3aeaf20437a714b6c2b6f817cd57d8cff09(master and this pull)
SHA256SUMS.part	`ad80f9275f7592f5...`	`60cfbff26d3ac855...`
*-aarch64-linux-gnu-debug.tar.gz	`e3f077c9e2efe42c...`	`1611c2fc3615b36a...`
*-aarch64-linux-gnu.tar.gz	`84c5837e967a705e...`	`e0db625be9859af1...`
*-arm-linux-gnueabihf-debug.tar.gz	`198436220bbb764e...`	`8115f020abf2acf7...`
*-arm-linux-gnueabihf.tar.gz	`8ab9ee456035f028...`	`fb518d26a6936a6c...`
*-arm64-apple-darwin-unsigned.tar.gz	`5f3493c8841e7000...`	`41229727f60b73c3...`
*-arm64-apple-darwin-unsigned.zip	`53586205b08dae04...`	`377fcbf11713b0cb...`
*-arm64-apple-darwin.tar.gz	`9bc61a1a9c494690...`	`19cf2e7611080487...`
*-powerpc64-linux-gnu-debug.tar.gz	`d736c35074e1ab00...`	`cba9b8d9e094dee0...`
*-powerpc64-linux-gnu.tar.gz	`dc3411d9d8e023d0...`	`60d275915f058dbe...`
*-riscv64-linux-gnu-debug.tar.gz	`14f550c7e6be73cb...`	`f881035b90972ed6...`
*-riscv64-linux-gnu.tar.gz	`a5ce20b057de5651...`	`b063b32fa7b6c2d8...`
*-x86_64-apple-darwin-unsigned.tar.gz	`0a5aeae59a745fdd...`	`ee329307733e0a36...`
*-x86_64-apple-darwin-unsigned.zip	`c17d6c147152032f...`	`3098eb653ffa25a8...`
*-x86_64-apple-darwin.tar.gz	`eb310f282a01918f...`	`21a73422bd7b32f1...`
*-x86_64-linux-gnu-debug.tar.gz	`788598dd19a44259...`	`c470987123553747...`
*-x86_64-linux-gnu.tar.gz	`6b13f937a5601c35...`	`57a8a8062bb61dc7...`
*.tar.gz	`d344eb18d56160d8...`	`e059bb50c284f19f...`
guix_build.log	`baf52e47221c27f4...`	`57984899bf58d2f5...`
guix_build.log.diff		`df4e8b61eda9235c...`

DrahtBot removed the label DrahtBot Guix build requested on Oct 25, 2024

hebasto commented at 5:00 pm on October 29, 2024: member

My Guix build:

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hebasto commented at 9:42 am on February 10, 2025: member

@theuni

However, switching the CC variable context from Makefile to the shell environment breaks expectations

Arguably that’s because this wasn’t intended to be supported :)

I suppose this fix is reasonable, though supporting env vars like this seems quite brittle.

There are testing environments, such as OSS-Fuzz, that rely on a project’s build system to support environment variables.

DrahtBot added the label Needs rebase on Feb 12, 2025

hebasto force-pushed on Feb 12, 2025

hebasto commented at 12:32 pm on February 12, 2025: member

Rebased to resolve the conflict with the merged bitcoin/bitcoin#30584.

DrahtBot removed the label Needs rebase on Feb 12, 2025

hebasto commented at 3:17 pm on February 12, 2025: member

My Guix build:

 0aarch64
 1ab623f96d21b9651618ccd3dd1dd547494ecbe199cf1146dfebde4d02cd141a4  guix-build-38d13e68e276/output/aarch64-linux-gnu/SHA256SUMS.part
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 3ae9eb92cdd2eee116bd48199ee9d8093082f58ce158badd47aaaa3cd044d2d9a  guix-build-38d13e68e276/output/aarch64-linux-gnu/bitcoin-38d13e68e276-aarch64-linux-gnu.tar.gz
 431c6976e87e9d1e87759ab3057f2c75eb5ed824e0a986a8317dd7b9bcd0d8fa7  guix-build-38d13e68e276/output/arm-linux-gnueabihf/SHA256SUMS.part
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10c3705df317214be53b9360f91ca9a4c1721c6bb4dad75cc348afb19d3f5c3858  guix-build-38d13e68e276/output/arm64-apple-darwin/bitcoin-38d13e68e276-arm64-apple-darwin.tar.gz
11db57e79fd0d357b99d8d4e762806933ac93d464f19f66b050c9cbe5f52250ab6  guix-build-38d13e68e276/output/dist-archive/bitcoin-38d13e68e276.tar.gz
12c221715291996b44d6f4b23afb9add05987d50936d0f52fda64d5ee8410b3806  guix-build-38d13e68e276/output/powerpc64-linux-gnu/SHA256SUMS.part
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theuni commented at 6:55 pm on February 12, 2025: member

I don’t understand this change. It seems setting CC_FOR_BUILD to CC is exactly the opposite of what we want to do? @hebasto’s original change makes more sense to me:

0BUILD = $(shell env --unset CC ./config.guess)

That ignores what’s set in CC when detecting the native platform, which seems like the correct behavior to me.

What was your intention with this patch, @fanquake ?

DrahtBot added the label CI failed on Jul 3, 2025

DrahtBot removed the label CI failed on Jul 3, 2025

hebasto commented at 2:47 pm on October 16, 2025: member

What was your intention with this patch, @fanquake ? @fanquake

Can you please follow up here?

fanquake commented at 3:01 pm on October 16, 2025: member

What was your intention with this patch, @fanquake ?

At this point I can’t remember.

hebasto force-pushed on Oct 16, 2025

hebasto commented at 3:30 pm on October 16, 2025: member

I don’t understand this change. It seems setting CC_FOR_BUILD to CC is exactly the opposite of what we want to do?

@hebasto’s original change makes more sense to me:
0BUILD = $(shell env --unset CC ./config.guess)
That ignores what’s set in CC when detecting the native platform, which seems like the correct behavior to me.

Reverted to the initial variant.

maflcko added the label DrahtBot Guix build requested on Oct 17, 2025

DrahtBot commented at 5:19 am on October 18, 2025: contributor

Guix builds (on x86_64) [untrusted test-only build, possibly unsafe, not for production use]

File	commit e744fd1249bf9577274614eaf3997bf4bbb612ff(master)	commit 54dbc5e77ad00e3f7380c38bfae16ad9b658ff82(pull/29963/merge)
*-aarch64-linux-gnu-debug.tar.gz	`32d2b2bff7365b1c...`	`ce61c970b8dc1d60...`
*-aarch64-linux-gnu.tar.gz	`3594fcd0903223b0...`	`c7c95543170ed8e4...`
*-arm-linux-gnueabihf-debug.tar.gz	`4de5c3cd73bd7eb9...`	`1a19b67c6b36dabd...`
*-arm-linux-gnueabihf.tar.gz	`13f399dfc5a94137...`	`d2948f4a50b0a508...`
*-arm64-apple-darwin-codesigning.tar.gz	`0c9523d4eb3ba947...`	`c151d061693ef9de...`
*-arm64-apple-darwin-unsigned.tar.gz	`f882bd8563b54515...`	`c5017f8707b03ecc...`
*-arm64-apple-darwin-unsigned.zip	`3a60151847070008...`	`025cfb4b4edbae2a...`
*-powerpc64-linux-gnu-debug.tar.gz	`8f1f0238de30643b...`	`255bfcdc5775c810...`
*-powerpc64-linux-gnu.tar.gz	`7e7ac48e6be97c65...`	`10ecdfeec2d83982...`
*-riscv64-linux-gnu-debug.tar.gz	`e3fd237224b534e3...`	`f3cc48ef19a06439...`
*-riscv64-linux-gnu.tar.gz	`fbb4391c11fd6b13...`	`4d975b60e434c347...`
*-x86_64-apple-darwin-codesigning.tar.gz	`1f328e37aeebed54...`	`e751d8b18aa1a9aa...`
*-x86_64-apple-darwin-unsigned.tar.gz	`45bc90bde841a319...`	`b58bed75699aacbd...`
*-x86_64-apple-darwin-unsigned.zip	`0e98d3057136e774...`	`bed415617451a200...`
*-x86_64-linux-gnu-debug.tar.gz	`df820b76cfc1f8fd...`	`707cc102e4367aac...`
*-x86_64-linux-gnu.tar.gz	`1498128d1e400b9b...`	`074e090586df1d19...`
*.tar.gz	`5a44c21c41738a47...`	`23a07719c8928b63...`
SHA256SUMS.part	`ac10442f7b6714bf...`	`f056342587a24108...`
guix_build.log	`c91f72065087d81c...`	`32f7c30269b7d917...`
guix_build.log.diff		`cf719a9200d66db7...`

DrahtBot removed the label DrahtBot Guix build requested on Oct 18, 2025

hebasto renamed this:
~~depends: Use `CC_FOR_BUILD` for `config.guess `~~
depends: Do not consider `CC` environment variable for detecting system
on Dec 4, 2025

ryanofsky approved

ryanofsky commented at 1:43 pm on December 15, 2025: contributor

Code review ACK a8cdc5872eaaffd56a8c79c6d371feb0df12431a. Seems good to unset an environment variable intended for cross compilation that is a causing a bad result when calling a native tool.

hebasto commented at 5:53 pm on December 15, 2025: member

My Guix build:

 0$ uname -m && find guix-build-$(git rev-parse --short=12 HEAD)/output/ -type f -print0 | env LC_ALL=C sort -z | xargs -r0 sha256sum
 1aarch64
 27499d3ff76f9fec34c5d18fe5a9b518a96b6a8bed0c4e4981a7d718ca70cd695  guix-build-a8cdc5872eaa/output/aarch64-linux-gnu/SHA256SUMS.part
 36edf8ed2a7548293a3ff2ddd4e6d8ea9b8d26af330a8e5e6b36a699a4f4b4ef3  guix-build-a8cdc5872eaa/output/aarch64-linux-gnu/bitcoin-a8cdc5872eaa-aarch64-linux-gnu-debug.tar.gz
 4bd3b3a35d0a8f458fb750332ffe87fa827623aa2165b771bc5fce68df0a77faf  guix-build-a8cdc5872eaa/output/aarch64-linux-gnu/bitcoin-a8cdc5872eaa-aarch64-linux-gnu.tar.gz
 5836f1dba1a32b7e875dadb2de06645b19a10e57cd6cb7fa83183076783048c58  guix-build-a8cdc5872eaa/output/arm-linux-gnueabihf/SHA256SUMS.part
 617f49dff7a519d4ef6db3346b6c3a85cbd69b5d7eb771278a66901af669fd65c  guix-build-a8cdc5872eaa/output/arm-linux-gnueabihf/bitcoin-a8cdc5872eaa-arm-linux-gnueabihf-debug.tar.gz
 7dbb62bdef08f4a66abbc4df29c6b6f13160eac829a2c57e159501b7b3f2c19f0  guix-build-a8cdc5872eaa/output/arm-linux-gnueabihf/bitcoin-a8cdc5872eaa-arm-linux-gnueabihf.tar.gz
 89b9307b0a4d55095e9e3c51739d68776c3a1ca0af94422157c549b91a2e73452  guix-build-a8cdc5872eaa/output/arm64-apple-darwin/SHA256SUMS.part
 9250af8ba53d39d4ce8a5c16956b064a7b2d82bb72f7097426f1b2477aa6d1c7a  guix-build-a8cdc5872eaa/output/arm64-apple-darwin/bitcoin-a8cdc5872eaa-arm64-apple-darwin-codesigning.tar.gz
10ee2958eb2ae9c27fb45804cf197c3d5ee13c7706382c7358c8175a17aa935820  guix-build-a8cdc5872eaa/output/arm64-apple-darwin/bitcoin-a8cdc5872eaa-arm64-apple-darwin-unsigned.tar.gz
11a3dfa546006a9cb118402ada458d9bbf5bafb9c9cf91abdf83492d34aea2f068  guix-build-a8cdc5872eaa/output/arm64-apple-darwin/bitcoin-a8cdc5872eaa-arm64-apple-darwin-unsigned.zip
12092eeec72bf498d7bd783a532c8874756bd13d6d9bd69a414222ef74a749fc62  guix-build-a8cdc5872eaa/output/dist-archive/bitcoin-a8cdc5872eaa.tar.gz
13687c8c72f1503e6b0ee54b233bd03d9dd4fb7d5902d91888bb482321b898c0fc  guix-build-a8cdc5872eaa/output/powerpc64-linux-gnu/SHA256SUMS.part
14cf3a04fcc59b81db4a0da1c970400a2b6f6230a0a89667c2d2ad934c3d48df24  guix-build-a8cdc5872eaa/output/powerpc64-linux-gnu/bitcoin-a8cdc5872eaa-powerpc64-linux-gnu-debug.tar.gz
15f6b68b8b2270092f4f65bdc66303f2230964838afccec322215bd81f8db90d19  guix-build-a8cdc5872eaa/output/powerpc64-linux-gnu/bitcoin-a8cdc5872eaa-powerpc64-linux-gnu.tar.gz
16d7b7e4a85940de9b8b77d3dabca47693d235c38bcbe8ce35208fd3a473f688c1  guix-build-a8cdc5872eaa/output/riscv64-linux-gnu/SHA256SUMS.part
172a53aeb926f648f802e570cfa4e942123baeb75d242ba655478b71ac860ae139  guix-build-a8cdc5872eaa/output/riscv64-linux-gnu/bitcoin-a8cdc5872eaa-riscv64-linux-gnu-debug.tar.gz
1859b42734415f705f7b55dbf8640ceba81f350a48e15e0d3c5bcac8422ea74302  guix-build-a8cdc5872eaa/output/riscv64-linux-gnu/bitcoin-a8cdc5872eaa-riscv64-linux-gnu.tar.gz
19e2915d9d12bdcf4d16e69922ac0274bcb5f73ef9c80f12755c6eb710afe937d7  guix-build-a8cdc5872eaa/output/x86_64-apple-darwin/SHA256SUMS.part
20dc89bdb96c2f40a59f962f04c1fa73aaddcc00945885d05932a9865665476a33  guix-build-a8cdc5872eaa/output/x86_64-apple-darwin/bitcoin-a8cdc5872eaa-x86_64-apple-darwin-codesigning.tar.gz
21124be6f6f93bd1720caa4e22c5c0b9ee31104fcda1ed5dc5ecf3e454fbbbc445  guix-build-a8cdc5872eaa/output/x86_64-apple-darwin/bitcoin-a8cdc5872eaa-x86_64-apple-darwin-unsigned.tar.gz
2275ef0b32548755b4dd3e6874449f163e421ad94f4ab282ecbc3b7f14450f83ae  guix-build-a8cdc5872eaa/output/x86_64-apple-darwin/bitcoin-a8cdc5872eaa-x86_64-apple-darwin-unsigned.zip
239c33d57ae3cdb5d1f8f7f7eb1318d9c6a858be04807492892fdaffbd4bbc810e  guix-build-a8cdc5872eaa/output/x86_64-linux-gnu/SHA256SUMS.part
24adbb6dda5bedeb6bb074ee7cfe1c25c0143f036314d5cdf76251ea165b66a08e  guix-build-a8cdc5872eaa/output/x86_64-linux-gnu/bitcoin-a8cdc5872eaa-x86_64-linux-gnu-debug.tar.gz
2587196f4a93e58022dfb35d7dc0324929527ac57410044ccaa33235d0b6068fad  guix-build-a8cdc5872eaa/output/x86_64-linux-gnu/bitcoin-a8cdc5872eaa-x86_64-linux-gnu.tar.gz
2651d0a2924d37c31605913776b4011f300f4af3e587148faa1777aae1c676fc12  guix-build-a8cdc5872eaa/output/x86_64-w64-mingw32/SHA256SUMS.part
277ccd8cb5185a4c1834f76d6e000d2a6f3299324971025d497e969f8b43e10b11  guix-build-a8cdc5872eaa/output/x86_64-w64-mingw32/bitcoin-a8cdc5872eaa-win64-codesigning.tar.gz
28e022f885987d0232017810e610f3ebfe57ca81c7f332fead23fc96331282964c  guix-build-a8cdc5872eaa/output/x86_64-w64-mingw32/bitcoin-a8cdc5872eaa-win64-debug.zip
297f408eee780c177b31b306ad5833505d9ee6942b82fad31faea1eeb9d9d03e36  guix-build-a8cdc5872eaa/output/x86_64-w64-mingw32/bitcoin-a8cdc5872eaa-win64-setup-unsigned.exe
30900619e260c79bffc4a9781a1c998729c97720a8a89ddef6994eb994670bf234  guix-build-a8cdc5872eaa/output/x86_64-w64-mingw32/bitcoin-a8cdc5872eaa-win64-unsigned.zip

ryanofsky commented at 10:06 pm on December 16, 2025: contributor

Current version of this PR is ok but I do think fanquake’s suggested change #29963 (comment) passing along the requested compiler to config.guess would be an improvement.

I think his change had a typo because it suggests using CC_FOR_BUILD=$CC when this should probably be CC_FOR_BUILD=$(build_CC) (or CC=$(build_CC) which is equivalent) because if a depends user specifies build_CC it makes sense to have config.guess use it instead of ignoring it and probing for alternate compilers:

https://github.com/bitcoin/bitcoin/blob/13891a8a685d255cb13dd5018e3d5ccc18b07c34/depends/config.guess#L126-L130

sedited approved

sedited commented at 10:16 pm on January 2, 2026: contributor

ACK a8cdc5872eaaffd56a8c79c6d371feb0df12431a

Edit: ryanofsky’s idea above (i.e. propagating build_CC seems like a good addition though.

depends: Do not consider `CC` environment variable when detecting system

Otherwise, the build system fails to detect cross-compiling mode
properly in some cases when `CC` is set.

b149a28f6b

in depends/Makefile:50 in a8cdc5872e

46@@ -47,7 +47,7 @@ FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources
47 C_STANDARD ?= c11
48 CXX_STANDARD ?= c++20
49 
50-BUILD = $(shell ./config.guess)
51+BUILD = $(shell env --unset CC ./config.guess)

fanquake commented at 11:20 am on January 20, 2026:

I don’t think this is portable. i.e on Chimera Linux:

0make -C depends/ -j15
1make: Entering directory '/bitcoin/depends'
2env: unrecognized option: -
3usage: env [-0iv] [-C workdir] [-L|-U user[/class]] [-P utilpath] [-S string]
4           [-u name] [name=value ...] [utility [argument ...]]
5config.sub: missing argument

hebasto commented at 5:54 pm on January 20, 2026:

Thanks! Reworked in a portable way.

hebasto force-pushed on Jan 20, 2026

hebasto commented at 5:54 pm on January 20, 2026: member

Rebased. @fanquake’s comment has been addressed.

hebasto commented at 6:01 pm on January 20, 2026: member

Current version of this PR is ok but I do think fanquake’s suggested change #29963 (comment) passing along the requested compiler to config.guess would be an improvement.

I think his change had a typo because it suggests using CC_FOR_BUILD=$CC when this should probably be CC_FOR_BUILD=$(build_CC) (or CC=$(build_CC) which is equivalent) because if a depends user specifies build_CC it makes sense to have config.guess use it instead of ignoring it and probing for alternate compilers:

https://github.com/bitcoin/bitcoin/blob/13891a8a685d255cb13dd5018e3d5ccc18b07c34/depends/config.guess#L126-L130

I agree that using CC_FOR_BUILD is the preferred way to communicate with config.guess. However, it will require non-trivial refactoring of depends/Makefile, as build_CC is evaluated late in depends/builders/default.mk.

hebasto commented at 9:46 am on January 21, 2026: member

My Guix build:

 0$ uname -m && find guix-build-$(git rev-parse --short=12 HEAD)/output/ -type f -print0 | env LC_ALL=C sort -z | xargs -r0 sha256sum
 1aarch64
 28c61dbdc73e273e9f336cdc64c48121037d0aed2a1a7f054184d827ac8499cd7  guix-build-b149a28f6b86/output/aarch64-linux-gnu/SHA256SUMS.part
 3b3ffed84220353f0ed0b4276e5705c5c4b8b8161e0f40cd45c69310f0ac41ff5  guix-build-b149a28f6b86/output/aarch64-linux-gnu/bitcoin-b149a28f6b86-aarch64-linux-gnu-debug.tar.gz
 483989804e95ac165fe08fc6fe39ff529140a4c123dabac670686d8b86bbfa039  guix-build-b149a28f6b86/output/aarch64-linux-gnu/bitcoin-b149a28f6b86-aarch64-linux-gnu.tar.gz
 5a9e02d7909575292e4e1d5664b1ccaf649344bc940fef6d58f3334893ee0f3c3  guix-build-b149a28f6b86/output/arm-linux-gnueabihf/SHA256SUMS.part
 6937a9f8fbe5a0dcedd6a4b4480a3b0f31b4bea574150a19a5c7c9df30b91b666  guix-build-b149a28f6b86/output/arm-linux-gnueabihf/bitcoin-b149a28f6b86-arm-linux-gnueabihf-debug.tar.gz
 79796fc4a2478b8dab6fadfca32e5f720df90b8c3fdc510855696ee8ab5c60df6  guix-build-b149a28f6b86/output/arm-linux-gnueabihf/bitcoin-b149a28f6b86-arm-linux-gnueabihf.tar.gz
 825240da10e175e00ff7144985b60c1a791aa38a728fdf6ade0b478b791df82e5  guix-build-b149a28f6b86/output/arm64-apple-darwin/SHA256SUMS.part
 939f0c66407749d1cec3014dc9f92f4550d7e01202e2b9ba074bce711f91c8e1b  guix-build-b149a28f6b86/output/arm64-apple-darwin/bitcoin-b149a28f6b86-arm64-apple-darwin-codesigning.tar.gz
1096dcd8518b25904dad4679e40738783ffb387a32c5fb2417801ed5cf9857f959  guix-build-b149a28f6b86/output/arm64-apple-darwin/bitcoin-b149a28f6b86-arm64-apple-darwin-unsigned.tar.gz
11b10fdcf921999bfeb2089f38cc73c95b3cd9044941e0b63ea1eada80bbaf78f2  guix-build-b149a28f6b86/output/arm64-apple-darwin/bitcoin-b149a28f6b86-arm64-apple-darwin-unsigned.zip
1264d27a1b596be20bfd954d717cb3b0e4cd514af37f28ed020e12e1c11f602a4e  guix-build-b149a28f6b86/output/dist-archive/bitcoin-b149a28f6b86.tar.gz
1345eb520337e8a5aab723e56ec48bd1c0fc70b74536f376c645f343a094ea1423  guix-build-b149a28f6b86/output/powerpc64-linux-gnu/SHA256SUMS.part
14ee7eb54979168091733f74e6ef94d2b04a777b74323e9bc9d1e6bdee4bcedf1c  guix-build-b149a28f6b86/output/powerpc64-linux-gnu/bitcoin-b149a28f6b86-powerpc64-linux-gnu-debug.tar.gz
1581350b0f2fd948dfe7b32d62f1ab9a29a66fa10747778180c7e7159c9ce0c91d  guix-build-b149a28f6b86/output/powerpc64-linux-gnu/bitcoin-b149a28f6b86-powerpc64-linux-gnu.tar.gz
165c1a05c5052168ce6624dcc17affa49fb9934fb14726fb567d3f6e092e4789f7  guix-build-b149a28f6b86/output/riscv64-linux-gnu/SHA256SUMS.part
171f4d807e17fa5519f41963a64f222ba329edd29e4c37404c195c77cc85e4e054  guix-build-b149a28f6b86/output/riscv64-linux-gnu/bitcoin-b149a28f6b86-riscv64-linux-gnu-debug.tar.gz
18c028a52b1d516553994fe27d7f4d5ddde16f8e3f9d137acb141070b3786482a2  guix-build-b149a28f6b86/output/riscv64-linux-gnu/bitcoin-b149a28f6b86-riscv64-linux-gnu.tar.gz
191c7e0069aec956a38b3e6b65b2cb3deca31b26f0150779c446e1952f8af50d92  guix-build-b149a28f6b86/output/x86_64-apple-darwin/SHA256SUMS.part
20f250735778c89347d920a57c48c1c359eab78b0f36d71298ceebdb2d806225ed  guix-build-b149a28f6b86/output/x86_64-apple-darwin/bitcoin-b149a28f6b86-x86_64-apple-darwin-codesigning.tar.gz
21b91f645b3bbfb960315706ca03d80335c1546f1736bad1c157ba466533b5ad35  guix-build-b149a28f6b86/output/x86_64-apple-darwin/bitcoin-b149a28f6b86-x86_64-apple-darwin-unsigned.tar.gz
22487a853c611780fc69d8c0661afeacfccb30b73a74d73e2808db0cdad292147e  guix-build-b149a28f6b86/output/x86_64-apple-darwin/bitcoin-b149a28f6b86-x86_64-apple-darwin-unsigned.zip
2382e85f8b085d703e765d5c349ea8a3e5fbcaf9e21a734ac4e71c13869dc9e3c8  guix-build-b149a28f6b86/output/x86_64-linux-gnu/SHA256SUMS.part
2461e8b2ee7156671ec763b7d3bd9ef61ec606a5757003d714a5f0ea0620e30360  guix-build-b149a28f6b86/output/x86_64-linux-gnu/bitcoin-b149a28f6b86-x86_64-linux-gnu-debug.tar.gz
257f433e6b6f2a6ca5c9c4e2b302a27164c545a80654257adb5be475824c4709b5  guix-build-b149a28f6b86/output/x86_64-linux-gnu/bitcoin-b149a28f6b86-x86_64-linux-gnu.tar.gz
267ed5214baf946578444de8d1201c7de12cb60f8493906da98d3804f227069182  guix-build-b149a28f6b86/output/x86_64-w64-mingw32/SHA256SUMS.part
273024741c291f97078dbf1097a67e73deb67f28e360f4cdbaaee106bae258ecf5  guix-build-b149a28f6b86/output/x86_64-w64-mingw32/bitcoin-b149a28f6b86-win64-codesigning.tar.gz
283c1a64176ddc05f926fa219cfebe58297eea9a918fa269f871cbfb6d0716ebd8  guix-build-b149a28f6b86/output/x86_64-w64-mingw32/bitcoin-b149a28f6b86-win64-debug.zip
2967fa2ae79b13f35b7ccfb90a8f25e92362985399c9e0bb3b80119e1b60719f60  guix-build-b149a28f6b86/output/x86_64-w64-mingw32/bitcoin-b149a28f6b86-win64-setup-unsigned.exe
3015d9dccd1d104aad970d9269e01d7d37d553a331b3355287294ea36d98205dbe  guix-build-b149a28f6b86/output/x86_64-w64-mingw32/bitcoin-b149a28f6b86-win64-unsigned.zip

depends: Do not consider CC environment variable for detecting system #29963

UPDATE 2026-01-20

Code Coverage & Benchmarks

Reviews

Conflicts

Guix builds (on x86_64) [untrusted test-only build, possibly unsafe, not for production use]

Guix builds (on x86_64) [untrusted test-only build, possibly unsafe, not for production use]

depends: Do not consider `CC` environment variable for detecting system #29963