Date: Sun, 2 Feb 2020 23:40:37 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Static linking is broken after creation of DT_TEXTREL segment On Mon, Feb 03, 2020 at 05:32:51AM +0100, Markus Wichmann wrote: > On Sun, Feb 02, 2020 at 10:10:36PM -0500, Rich Felker wrote: > > I'll probably end up having mcm pass --with-pic to GCC's top-level > > configure, but I see this will be picked up by some other libs like > > libcc1, which oddly aren't failing for the same reason. Any idea why? > > I'd guess they don't use assembly, or at least their assembly does not > try to access global symbols. I haven't looked at the source though. And > I won't until the afternoon at least. > > > Is this the right fix for mcm? What could/should be done to unbreak > > gmp with default-pie toolchains? Is it a bug in the version of libtool > > they're using or a bug in gmp? > > > > Rich > > The problem is with the assumptions of GMP. And I really don't know how > to fix those. GMP's build system generates a dynamic and a static > library, and assumes that the static library does not need to be PIC. > With the advent of static-pie, this assumption is subverted. But how to Even before static-pie it was wrong. If you're making a dynamic-linked PIE executable but want to static link libgmp, it will be wrong. > deal with this generally? Many libraries assume the static one does not > need PIC. Everything else honors the compiler's default. If $(CC) was built for default-pie, or if you set CC="gcc -fPIE -pie" or something similar, you'd get a static library that's PIE-compatible. Only gmp is broken because its asm is wrongly poking at some libtool vars rather than __PIC__ from the compiler. > In case of GMP, I would argue they can add a test to determine if the > toolchain generates static-pie, and turn on PIC by default if so. No > clue if upstream will like that, though. All they need to do is look at __PIC__ in place of whatever wrong test they're doing now. The question is just how easy this is to patch. Rich
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