https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: media-gfx/oxipng-5.0.1 fails to compile (lto). Discovered on: amd64 (internal ref: guru_tinderbox) NOTE: This machine uses lto with CFLAGS=-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing
Created attachment 793157 [details] build.log build log and emerge --info
Error(s) that match a know pattern in addition to what has been reported in the summary: /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: cloudflare_zlib.c521b3d4-cgu.8:(.text._ZN15cloudflare_zlib3def7Deflate17compress_internal17hbe585d6f2210bbadE+0x1a9): undefined reference to `deflate' /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: cloudflare_zlib.c521b3d4-cgu.8:(.text._ZN15cloudflare_zlib3def7Deflate17compress_internal17hbe585d6f2210bbadE+0x2ca): undefined reference to `deflate' /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: cloudflare_zlib.c521b3d4-cgu.8:(.text._ZN15cloudflare_zlib3def7Deflate17compress_internal17hbe585d6f2210bbadE+0x37a): undefined reference to `deflate' /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: oxipng.f9e99ada-cgu.11:(.text._ZN6oxipng7deflate8deflater7deflate17h70394946385f1190E+0x10f): undefined reference to `libdeflate_free_compressor' /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: oxipng.f9e99ada-cgu.11:(.text._ZN6oxipng7deflate8deflater7deflate17h70394946385f1190E+0x90): undefined reference to `libdeflate_zlib_compress' /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: oxipng.f9e99ada-cgu.4:(.text._ZN6oxipng7deflate6cfzlib14cfzlib_deflate17h9ad7604b0fa3e2c4E+0x361): undefined reference to `deflateEnd' /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: oxipng.f9e99ada-cgu.4:(.text._ZN6oxipng7deflate6cfzlib14cfzlib_deflate17h9ad7604b0fa3e2c4E+0x413): undefined reference to `deflateEnd' cloudflare_zlib.c521b3d4-cgu.8:(.text._ZN15cloudflare_zlib3def7Deflate12new_with_vec17h7d67898bc34199eeE+0xab): undefined reference to `deflateInit2_' cloudflare_zlib.c521b3d4-cgu.8:(.text._ZN15cloudflare_zlib3def7Deflate17compress_internal17hbe585d6f2210bbadE+0xa9): undefined reference to `deflate' oxipng.f9e99ada-cgu.11:(.text._ZN4core3ptr44drop_in_place$LT$libdeflater..Compressor$GT$17he89cdd5e3ab6e494E+0x5): undefined reference to `libdeflate_free_compressor' oxipng.f9e99ada-cgu.11:(.text._ZN6oxipng7deflate8deflater7deflate17h70394946385f1190E+0x20): undefined reference to `libdeflate_alloc_compressor' oxipng.f9e99ada-cgu.4:(.text._ZN4core3ptr50drop_in_place$LT$cloudflare_zlib..def..Deflate$GT$17heedc9b37b1603be9E+0xc): undefined reference to `deflateEnd' oxipng.f9e99ada-cgu.4:(.text._ZN6oxipng7deflate6cfzlib14cfzlib_deflate17h9ad7604b0fa3e2c4E+0x2db): undefined reference to `deflateEnd' error: linking with `x86_64-pc-linux-gnu-gcc` failed: exit status: 1
`-flto` was enough to reproduce. It seems like `CFLAGS=-flto` is not expected to work with gcc? (cf. <https://github.com/rust-lang/cargo/issues/2014#issuecomment-145189477>) As an workaround, appending `-flto` to CFLAGS will work. (Of cource it forcibly disables LTO in this case.)
> As an workaround, appending `-flto` to CFLAGS will work. Sorry, appending `-fno-lto` will work. (Worked in my environment.) I think this should be resolved on cargo.eclass side, but I'm not sure.
All versions since this package has been moved to ::gentoo contain filter-lto, I'll mark this bug as fixed.
