The following is a project created by dub init.

dub.json

{
	"authors": [
		"john"
	],
	"dependencies": {
		"squiz-box": {
			"repository": "git+https://github.com/rtbo/squiz-box.git",
			"version": "6a10caaa01f7cefbe83c65b5a939bee2e0296250"
		}
	},
	"description": "Demo program",
	"license": "BSD 2 clause",
	"name": "gdc_curl"
}

app.d

import std.net.curl : get, download;

import squiz_box;

void main()
{
    immutable jsonURL = "https://ziglang.org/download/index.json";
    auto jsonStr = get(jsonURL);
}

squiz_box is a dlang library for compression and decompression.

I am able to compile this ldc2 and dmd, but not gdc. The error appears to be related to the line import squiz_box, removing of which causes the program to compile successfully, as the main function doesn't call the squiz_box library at all.

dub build --compiler=gdc --verbose

Using dub registry url 'https://code.dlang.org/'
Note: Failed to determine version of package gdc_curl at .. Assuming ~master.
  Version selection for dependency squiz-box (squiz-box) of gdc_curl is missing.
Scanning local packages...
Determined package version using GIT: squiz-box 0.2.1+commit.51.ga962211
Determined package version using GIT: squiz-box 0.2.1+commit.87.gf0ba9db
Determined package version using GIT: squiz-box 0.3.0+commit.15.g6a10caa
  Found dependency squiz-box git+https://github.com/rtbo/squiz-box.git
Generating using build
Configuring dependent gdc_curl, deps:"squiz-box"
  Configuring dependent squiz-box, deps:
    Starting Performing "debug" build using gdc for x86_64.
  Up-to-date squiz-box 0.3.0+commit.15.g6a10caa: target for configuration [library] is up to date.
Using existing build in /home/john/.dub/cache/squiz-box/0.3.0+commit.15.g6a10caa/build/library-debug-8Bi8iTVskbYwwEp3wicUsw.
Copying target from /home/john/.dub/cache/squiz-box/0.3.0+commit.15.g6a10caa/build/library-debug-8Bi8iTVskbYwwEp3wicUsw/libsquiz-box.a to /home/john/.dub/packages/squiz-box/6a10caaa01f7cefbe83c65b5a939bee2e0296250/squiz-box
Target '/home/john/.dub/cache/gdc_curl/~master/build/application-debug-G0CAYx5HyZ1UeOgA779Diw/gdc_curl' doesn't exist, need rebuild.
    Building gdc_curl ~master: building configuration [application]
Using pkg-config to resolve library flags for liblzma, libzstd.
Using direct -l... flags for bz2.
gdc -o /home/john/.dub/cache/gdc_curl/~master/build/application-debug-G0CAYx5HyZ1UeOgA779Diw/gdc_curl -fdebug -g -Werror -Wall -fversion=Have_gdc_curl -fversion=Have_squiz_box -fversion=HaveSquizBzip2 -fversion=HaveSquizLzma -fversion=HaveSquizZstandard -Isource/ -I/home/john/.dub/packages/squiz-box/6a10caaa01f7cefbe83c65b5a939bee2e0296250/squiz-box/src/ source/app.d /home/john/.dub/cache/squiz-box/0.3.0+commit.15.g6a10caa/build/library-debug-8Bi8iTVskbYwwEp3wicUsw/libsquiz-box.a -lbz2 -Xlinker -llzma -Xlinker -lzstd
/usr/bin/ld: /tmp/ccPUp96p.o: in function `_D3std6format8internal5write__T8getWidthTAyaZQoFNaNfQlZl':
/usr/lib/gcc/x86_64-redhat-linux/13/include/d/std/format/internal/write.d:3639: undefined reference to `_D3std9algorithm9searching__T3allSQBg6format8internal5write__T8getWidthTAyaZQoFQhZ9__lambda2Z__TQCpTQBcZQCxMFNaNfQBpZb'
/usr/bin/ld: /tmp/ccPUp96p.o: in function `_D3std6format8internal5write__T20formatValueImplUlongTSQCb5array__T8AppenderTAyaZQoTaZQCdFNaNfKQBpmIbMKxSQDzQDy4spec__T10FormatSpecTaZQpZv':
/usr/lib/gcc/x86_64-redhat-linux/13/include/d/std/format/internal/write.d:262: undefined reference to `_D3std9algorithm9searching__T3allSQBg6format8internal5write__T20formatValueImplUlongTSQDg5array__T8AppenderTAyaZQoTaZQCdFKQBlmIbMKxSQFaQDu4spec__T10FormatSpecTaZQpZ10__lambda16Z__TQFvTAaZQGcMFNaNfQmZb'
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/13/include/d/std/format/internal/write.d:268: undefined reference to `_D3std9algorithm9searching__T3allSQBg6format8internal5write__T20formatValueImplUlongTSQDg5array__T8AppenderTAyaZQoTaZQCdFKQBlmIbMKxSQFaQDu4spec__T10FormatSpecTaZQpZ10__lambda17Z__TQFvTAaZQGcMFNaNfQmZb'
collect2: error: ld returned 1 exit status
FAIL /home/john/.dub/cache/gdc_curl/~master/build/application-debug-G0CAYx5HyZ1UeOgA779Diw gdc_curl executable
Error gdc failed with exit code 1.

I cannot figure out this error is caused by squiz_box libray, gdc or dub. My apologies to you if I should have filed this bug in other places. Thanks for your attention.

On Saturday, 14 October 2023 at 17:53:01 UTC, Johann wrote:

Based on the symbol names, it could be this PR, which was fixed as of gdc versions 13.2 and 12.3

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108055

On Saturday, 14 October 2023 at 19:01:53 UTC, Iain Buclaw wrote:

Sorry somehow I forget to attach the version of gdc in the post,

gdc --version
gdc (GCC) 13.2.1 20230918 (Red Hat 13.2.1-3)

cat /etc/redhat-release
Fedora release 39 (Thirty Nine)

On Saturday, 14 October 2023 at 19:28:59 UTC, Johann wrote:

gdc --version
gdc (GCC) 13.2.1 20230918 (Red Hat 13.2.1-3)

cat /etc/redhat-release
Fedora release 39 (Thirty Nine)

Thanks.

One potential reduction seems to suggest gdc is emitting too much, rather than too little.

dmd 2.103.1

--- dmd -v
function  D main
function  app._d_cmain!().main
function  curl.get!().get
function  std.format.format!().format
function  std.format.formattedWrite!string.formattedWrite
function  std.format.internal.write.formatValueImpl!int.formatValueImpl
--- nm app.o
W _Dmain
W main
W _D4curl__T3getZQfFNaNbAxaZv
W _D3std6format__TQkZQnFNaNbAyaQdZQg
W _D3std6format__T14formattedWriteTAyaZQvFNaNbQlZk
W _D3std6format8internal5write__T15formatValueImplTiZQuFNaNfxiZv
U _D3std6format8internal5write__T8getWidthTAyaZQoFNaNfQlZl

gdc 13.2

--- gdc -v
function  D main
function  app._d_cmain!().main
function  curl.get!().get
function  std.format.format!().format
function  std.format.formattedWrite!string.formattedWrite
function  std.format.internal.write.formatValueImpl!int.formatValueImpl
function  std.format.internal.write.getWidth!string.getWidth
--- nm app.o
T _Dmain
T main
W _D4curl__T3getZQfFNaNbAxaZv
W _D3std6format__TQkZQnFNaNbAyaQdZQg
W _D3std6format__T14formattedWriteTAyaZQvFNaNbQlZk
W _D3std6format8internal5write__T15formatValueImplTiZQuFNaNfxiZv
W _D3std6format8internal5write__T8getWidthTAyaZQoFNaNfQlZl
U _D3std9algorithm9searching__T3allSQBg6format8internal5write__T8getWidthTAyaZQoFQhZ9__lambda2Z__TQCpTQBcZQCxMFNaNfQBpZb