Compilation error "section type conflict: .note.GNU-stack 01 <> 07" on Linux/amd64

[lcheylus]

Describe the bug

When running some tests on Linux/amd64 (Debian testing/forky), an error occurs during compilation:

cc: /usr/lib/x86_64-linux-gnu/crt1.o: error: section type conflict: .note.GNU-stack 01 <> 07
cc: /home/fox/dev/Perso/vlang.git/thirdparty/tcc/lib/libgc.a: error: section type conflict: .note.GNU-stack 01 <> 07

Reproduction Steps

• Build V on Linux/amd64 from Git sources with make
• Run tests with VTEST_JUST_ESSENTIAL=1 ./v -cc <compiler> test-self with tcc or clang compiler

Expected Behavior

No error during compilation for ./v test-self

Current Behavior

• With tcc compiler: 7 tests failed for v test-self

$ VTEST_JUST_ESSENTIAL=1 ./v test-self
(...)
To reproduce just failure 1 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/json/tests/json_decode_test.v'
To reproduce just failure 2 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/net/http/http_test.v'
To reproduce just failure 3 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/net/http/request_test.v'
To reproduce just failure 4 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/net/http/server_test.v'
To reproduce just failure 5 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/v/slow_tests/inout/compiler_test.v'
To reproduce just failure 6 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/v/compiler_errors_test.v'
To reproduce just failure 7 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/v/gen/c/coutput_test.v'
Summary for testing: cmd, vlib: 7 failed, 62 passed, 69 total. Elapsed time: 108611 ms, on 7 parallel jobs. Comptime: 209038 ms. Runtime: 342439 ms.

• With clang compiler (version 21.1.8): 3 tests failed for v test-self

$ VTEST_JUST_ESSENTIAL=1 ./v -cc clang test-self
(...)
To reproduce just failure 1 run:    '/home/fox/dev/Perso/vlang.git/v' -cc clang '/home/fox/dev/Perso/vlang.git/vlib/v/slow_tests/inout/compiler_test.v'
To reproduce just failure 2 run:    '/home/fox/dev/Perso/vlang.git/v' -cc clang '/home/fox/dev/Perso/vlang.git/vlib/v/compiler_errors_test.v'
To reproduce just failure 3 run:    '/home/fox/dev/Perso/vlang.git/v' -cc clang '/home/fox/dev/Perso/vlang.git/vlib/v/gen/c/coutput_test.v'
Summary for testing: cmd, vlib: 3 failed, 65 passed, 1 skipped, 69 total. Elapsed time: 78477 ms, on 7 parallel jobs. Comptime: 111759 ms. Runtime: 191187 ms.

Detailed error with vlib/net/http/http_test.v test:

$ ./v test vlib/net/http/http_test.v
---- Testing... ----------------------------------------------------------------------------------------------------------------------------
 FAIL     0.000 ms vlib/net/http/http_test.v
>> compilation failed:
================== C compilation error (from tcc): ==============
cc: /usr/lib/x86_64-linux-gnu/crt1.o: error: section type conflict: .note.GNU-stack 01 <> 07
cc: /home/fox/dev/Perso/vlang.git/thirdparty/tcc/lib/libgc.a: error: section type conflict: .note.GNU-stack 01 <> 07
=================================================================
Try passing `-g` when compiling, to see a .v file:line information, that correlates more with the C error.
(Alternatively, pass `-show-c-output`, to print the full C error message).
builder error:
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

--------------------------------------------------------------------------------------------------------------------------------------------
To reproduce just failure 1 run:    '/home/fox/dev/Perso/vlang.git/v'  '/home/fox/dev/Perso/vlang.git/vlib/net/http/http_test.v'
Summary for all V _test.v files: 1 failed, 1 total. Elapsed time: 5077 ms, on 1 job. Comptime: 5004 ms. Runtime: 0 ms.

Possible Solution

No response

Additional Information/Context

According to the error message, there is a conflict between thirdparty/tcc/lib/libgc.a and /usr/lib/x86_64-linux-gnu/crt1.o for the ELF headers.

On my Linux/amd64 Debian/testing system, the file /usr/lib/x86_64-linux-gnu/crt1.o comes from the libc6-dev:amd64 package (last version installed = 2.42-10+b1 from Debian testing repository).

V version

V 0.5.0 c3b924c

Environment details (OS name and version, etc.)

V full version	V 0.5.0 c3b924c
OS	linux, Debian GNU/Linux forky/sid
Processor	8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Memory	3.74GB/31.23GB
V executable	/home/fox/dev/Perso/vlang.git/v
V last modified time	2026-01-24 16:24:16
V home dir	OK, value: /home/fox/dev/Perso/vlang.git
VMODULES	OK, value: /home/fox/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/fox/dev/Perso/vlang.git
Git version	git version 2.51.0
V git status	weekly.2026.04-17-gc3b924c7
.git/config present	true
cc version	cc (Debian 15.2.0-12) 15.2.0
gcc version	gcc (Debian 15.2.0-12) 15.2.0
clang version	Debian clang version 21.1.8 (1+b1)
tcc version	tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
tcc git status	thirdparty-linux-amd64 696c1d84
emcc version	N/A
glibc version	ldd (Debian GLIBC 2.42-10+b1) 2.42

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[tankf33der]

I was able to reproduce the issue.

[JalonSolov]

Doesn't fail for me.

|V full version      |V 0.5.0 cfc3dd02a369a7b91bd617beebad2ccc979cfe81.c3b924c
|:-------------------|:-------------------
|OS                  |linux, "Manjaro Linux"
|Processor           |32 cpus, 64bit, little endian, AMD Ryzen 9 7950X 16-Core Processor
|Memory              |4.67GB/30.49GB
|                    |
|V executable        |/home/jalon/git/v/v
|V last modified time|2026-01-24 16:09:30
|                    |
|V home dir          |OK, value: /home/jalon/git/v
|VMODULES            |OK, value: /home/jalon/.vmodules
|VTMP                |OK, value: /tmp/v_1000
|Current working dir |OK, value: /home/jalon/git/v
|                    |
|Git version         |git version 2.52.0
|V git status        |weekly.2026.04-17-gc3b924c7
|.git/config present |true
|                    |
|cc version          |cc (GCC) 15.2.1 20251112
|gcc version         |gcc (GCC) 15.2.1 20251112
|clang version       |clang version 21.1.6
|tcc version         |tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
|tcc git status      |thirdparty-linux-amd64 696c1d84
|emcc version        |N/A
|glibc version       |ldd (GNU libc) 2.42

$ VTEST_JUST_ESSENTIAL=1 ./v -cc tcc -o vtest test-self
...
Summary for testing: cmd, vlib: 69 passed, 69 total. Elapsed time: 30972 ms, on 31 parallel jobs. Comptime: 29931 ms. Runtime: 84302 ms.
$ VTEST_JUST_ESSENTIAL=1 ./v -cc gcc -o vtest test-self
...
Summary for testing: cmd, vlib: 68 passed, 1 skipped, 69 total. Elapsed time: 33068 ms, on 31 parallel jobs. Comptime: 109812 ms. Runtime: 81282 ms.
$ VTEST_JUST_ESSENTIAL=1 ./v -cc clang -o vtest test-self
...
Summary for testing: cmd, vlib: 68 passed, 1 skipped, 69 total. Elapsed time: 32328 ms, on 31 parallel jobs. Comptime: 80910 ms. Runtime: 80265 ms.
$

[tankf33der]

https://lists.nongnu.org/archive/html/tinycc-devel/2026-01/msg00026.html

[tankf33der]

@lcheylus - your system is updated, right?
As workaround you can downgrade (!) libc6 to version 2.42-10 from 2.42-10+b1.

[lcheylus]

@lcheylus - your system is updated, right? As workaround you can downgrade (!) libc6 to version 2.42-10 from 2.42-10+b1.

Yes, my Linux/amd64 Debian/testing is updated (I run apt update && apt upgrade command every morning to install the latest version of updated packages).

Thanks for your research. This issue is confirmed: bug with tcc during link with libc version 2.42-10+b1 (Debian package) => https://lists.nongnu.org/archive/html/tinycc-devel/2026-01/msg00029.html