* bug#50556: Clang retains extraneous references to GCC (and zlib)
@ 2021-09-12 23:22 Sarah Morgensen
0 siblings, 0 replies; only message in thread
From: Sarah Morgensen @ 2021-09-12 23:22 UTC (permalink / raw)
To: 50556
Hello Guix,
I recently noticed that Clang has some extra references:
--8<---------------cut here---------------start------------->8---
$ guix size clang
store item total self
/gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0 979.2 496.0 50.7%
/gnu/store/rmc131fpy2hv408a1awd2wm7kiwyf7d7-llvm-12.0.0 234.1 162.7 16.6%
/gnu/store/rn75fm7adgx3pw5j8pg3bczfqq1y17lk-gcc-7.5.0 178.5 107.3 11.0%
/gnu/store/8zvc5mvk0xm3ygrxsgpyy5ilxb5rzjry-perl-5.30.2 146.2 57.1 5.8%
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31 38.4 36.7 3.8%
/gnu/store/f0ca0lf64bw08srv1bj7gkg6ag0sbdb2-gcc-7.5.0-lib 71.0 32.6 3.3%
/gnu/store/01b4w3m6mp55y531kyi1g8shh722kwqm-gcc-7.5.0-lib 71.0 32.6 3.3%
/gnu/store/nzfhh1rm85lx2p5plbx45qqj82pcv5hp-clang-runtime-12.0.0 95.9 24.9 2.5%
/gnu/store/57xj5gcy1jbl9ai2lnrqnpr0dald9i65-coreutils-8.32 88.0 17.0 1.7%
/gnu/store/c8w9z48vvx2a3q3k44ch9yn00wk1qwhb-libxml2-2.9.10 81.1 7.9 0.8%
/gnu/store/mmhimfwmmidf09jw1plw3aw1g1zn2nkh-bash-static-5.0.16 1.6 1.6 0.2%
/gnu/store/pwcp239kjf7lnj5i4lkdzcfcxwcfyk72-bash-minimal-5.0.16 39.4 1.0 0.1%
/gnu/store/r7k859hmcnkazf492fasqvk25jflnfk6-xz-5.2.4 73.0 0.9 0.1%
/gnu/store/g2s5jfkfd4k973wb58476b1bbv9zpm6m-zlib-1.2.11 38.6 0.2 0.0%
/gnu/store/rykm237xkmq7rl1p0nwass01p090p88x-zlib-1.2.11 71.2 0.2 0.0%
/gnu/store/bw15z9kh9c65ycc2vbhl2izwfwfva7p1-libffi-3.3 71.2 0.2 0.0%
total: 979.2 MiB
--8<---------------cut here---------------end--------------->8---
It retains references two *two* separate gcc-7.5.0-lib outputs, two
separate zlib-1.2.11 outputs, and a gcc-7.5.0 output (clang shouldn't
need GCC, right?)
--8<---------------cut here---------------start------------->8---
$ guix gc --references /gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0
/gnu/store/01b4w3m6mp55y531kyi1g8shh722kwqm-gcc-7.5.0-lib
/gnu/store/8zvc5mvk0xm3ygrxsgpyy5ilxb5rzjry-perl-5.30.2
/gnu/store/c8w9z48vvx2a3q3k44ch9yn00wk1qwhb-libxml2-2.9.10
/gnu/store/f0ca0lf64bw08srv1bj7gkg6ag0sbdb2-gcc-7.5.0-lib
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31
/gnu/store/nzfhh1rm85lx2p5plbx45qqj82pcv5hp-clang-runtime-12.0.0
/gnu/store/rmc131fpy2hv408a1awd2wm7kiwyf7d7-llvm-12.0.0
/gnu/store/rn75fm7adgx3pw5j8pg3bczfqq1y17lk-gcc-7.5.0
/gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0
--8<---------------cut here---------------end--------------->8---
Okay, so only the gcc references are direct. Where is the double
gcc-7.5.0-lib reference coming from?
--8<---------------cut here---------------start------------->8---
$ readelf -d /gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0/bin/clang-12 | grep runpath
0x000000000000001d (RUNPATH) Library runpath: [/gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0/lib:/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib:/gnu/store/01b4w3m6mp55y531kyi1g8shh722kwqm-gcc-7.5.0-lib/lib:/gnu/store/rmc131fpy2hv408a1awd2wm7kiwyf7d7-llvm-12.0.0/lib:/gnu/store/f0ca0lf64bw08srv1bj7gkg6ag0sbdb2-gcc-7.5.0-lib/lib]
$ ldd /gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0/bin/clang-12 | grep -v LLVM
linux-vdso.so.1 (0x00007ffe55cbb000)
libpthread.so.0 => /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/libpthread.so.0 (0x00007f0cd9d1b000)
libstdc++.so.6 => /gnu/store/01b4w3m6mp55y531kyi1g8shh722kwqm-gcc-7.5.0-lib/lib/libstdc++.so.6 (0x00007f0cd6f33000)
libm.so.6 => /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/libm.so.6 (0x00007f0cd6df2000)
libgcc_s.so.1 => /gnu/store/01b4w3m6mp55y531kyi1g8shh722kwqm-gcc-7.5.0-lib/lib/libgcc_s.so.1 (0x00007f0cd6dd9000)
libc.so.6 => /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/libc.so.6 (0x00007f0cd6c1c000)
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/ld-linux-x86-64.so.2 (0x00007f0cdcf19000)
librt.so.1 => /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/librt.so.1 (0x00007f0cd64ed000)
libdl.so.2 => /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/libdl.so.2 (0x00007f0cd64e8000)
libz.so.1 => /gnu/store/rykm237xkmq7rl1p0nwass01p090p88x-zlib-1.2.11/lib/libz.so.1
(0x00007f0cd64c8000)
--8<---------------cut here---------------end--------------->8---
It has an extra runpath but doesn't use it... Why does it have it?
--8<---------------cut here---------------start------------->8---
$ rg "db2-gcc-7.5.0-lib" /gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0
/gnu/store/vn69pklab842xyig8d0c6xq6s9iyqhl0-clang-12.0.0/include/clang/Config/config.h
58:#define GCC_INSTALL_PREFIX "/gnu/store/f0ca0lf64bw08srv1bj7gkg6ag0sbdb2-gcc-7.5.0-lib"
--8<---------------cut here---------------end--------------->8---
So the configure step is probably putting that in there... but why does
it have access to two different gcc-7.5.0-lib inputs in the first place?
--8<---------------cut here---------------start------------->8---
(inputs
`(("libxml2" ,libxml2)
("gcc-lib" ,gcc "lib")
,@(package-inputs llvm)
--8<---------------cut here---------------end--------------->8---
That's reasonable, for cross-compiling... or should it be
`,(canonical-package gcc)' instead? It couldn't be that simple, could
it?
But even if that fixes non-cross-compiled builds, the above implies that
cross-compiled Clangs could retain a reference to the native gcc-lib as
well. That shouldn't be, right?
As for zlib... zlib isn't a direct reference, so where is it coming from?
--8<---------------cut here---------------start------------->8---
$ guix gc --references /gnu/store/c8w9z48vvx2a3q3k44ch9yn00wk1qwhb-libxml2-2.9.10
/gnu/store/01b4w3m6mp55y531kyi1g8shh722kwqm-gcc-7.5.0-lib
/gnu/store/c8w9z48vvx2a3q3k44ch9yn00wk1qwhb-libxml2-2.9.10
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31
/gnu/store/pwcp239kjf7lnj5i4lkdzcfcxwcfyk72-bash-minimal-5.0.16
/gnu/store/r7k859hmcnkazf492fasqvk25jflnfk6-xz-5.2.4
/gnu/store/rykm237xkmq7rl1p0nwass01p090p88x-zlib-1.2.11
$ guix gc --references /gnu/store/rn75fm7adgx3pw5j8pg3bczfqq1y17lk-gcc-7.5.0
/gnu/store/01b4w3m6mp55y531kyi1g8shh722kwqm-gcc-7.5.0-lib
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31
/gnu/store/g2s5jfkfd4k973wb58476b1bbv9zpm6m-zlib-1.2.11
/gnu/store/mmhimfwmmidf09jw1plw3aw1g1zn2nkh-bash-static-5.0.16
/gnu/store/rn75fm7adgx3pw5j8pg3bczfqq1y17lk-gcc-7.5.0
--8<---------------cut here---------------end--------------->8---
They use two separate zlibs, even though they both reference the same
zlib package! Why?
I hope we have a Clang expert here! What do you think?
--
Sarah
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2021-09-12 23:22 bug#50556: Clang retains extraneous references to GCC (and zlib) Sarah Morgensen
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