Bug 822312 - -fstack-protector-all results in dynamic dependency on libssp-0.dll
Summary: -fstack-protector-all results in dynamic dependency on libssp-0.dll
Alias: None
Product: Fedora
Classification: Fedora
Component: mingw-gcc
Version: 17
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Erik van Pienbroek
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2012-05-17 03:19 UTC by Gregory Maxwell
Modified: 2013-08-01 17:03 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2013-08-01 17:03:21 UTC
Type: Bug

Attachments (Terms of Use)

Description Gregory Maxwell 2012-05-17 03:19:15 UTC
When building a package which specifies -fstack-protector-all in CFLAGS/LDFLAGs the resulting mingw32 binary needs libssp-0.dll.  No amount of -static / -Wl,-static -lssp makes it statically link it.

The extra dependency is a bit of a nuance especially when building DLLs, and native -fstack-protector-all binaries don't have this behavior.

To reproduce, take a package that turns on stack protector as part of its autoconf setup (http://opus-codec.org/ for example) and mingw32-configure it.

Comment 1 Erik van Pienbroek 2012-05-17 14:00:03 UTC
I just tried to reproduce this here, but it seems to work as expected with mingw32-gcc-4.7.0-2.fc17.x86_64:

$ cat test.c
#include <stdio.h>

int main(int argc, char **argv)
	printf("Hello world\n");
	return 0;

$ i686-w64-mingw32-gcc test.c -o test.exe -fstack-protector-all
$ i686-w64-mingw32-objdump -p test.exe | grep "DLL Name"
	DLL Name: KERNEL32.dll
	DLL Name: msvcrt.dll
	DLL Name: libssp-0.dll

$ i686-w64-mingw32-gcc -static test.c -o test.exe -fstack-protector-all
$ i686-w64-mingw32-objdump -p test.exe | grep "DLL Name"
	DLL Name: KERNEL32.dll
	DLL Name: msvcrt.dll
	DLL Name: msvcrt.dll

Comment 2 Gregory Maxwell 2012-05-17 14:06:32 UTC
Hm. I'll see what distinguishes our test cases and report back… since being able to manually make it static would be a big improvement.

But I don't believe that libssp-0 being static with -static is the expected behavior in any case. That would be like dynamically linking libgcc.   On the native Linux binaries you never see libssp dynamically linked.

Comment 3 Kai Tietz 2012-05-18 14:03:05 UTC
hmm, by using '-static' option on gcc's frontend, it is absolutely to be expected that only the static-libraries are linked.  This is true as long as there is a .dll.a and a .a library of same name present.

Comment 4 Gregory Maxwell 2012-05-18 14:41:29 UTC
To clarify: I mean I expect ssp to be static no matter if -static is set or not.

Comment 5 Kai Tietz 2012-05-18 16:30:13 UTC
This expectation is not correct.  By default gcc uses shared (means on Windoze DLL) libraries.  As libssp is built as DLL version and as static version, of course it uses by default the shared one.
If you want to force static version of a library, then you need to add it explicit to the linker.  Also be aware that in combination with libtool things might get weird about static/shared, too.

Comment 6 Gregory Maxwell 2012-05-18 16:40:43 UTC
If you say so— though this simply isn't the behavior it has on native binaries:

[gmaxwell@helmholtz tmp]$ gcc test.c -o test -fstack-protector-all
[gmaxwell@helmholtz tmp]$ ldd test
        linux-vdso.so.1 =>  (0x00007fffc618e000)
        libc.so.6 => /lib64/libc.so.6 (0x00000038ef600000)
        /lib64/ld-linux-x86-64.so.2 (0x00000038ef200000)

Though yes indeed, it confuses the heck out of libtool which actually was my problem in getting it to produce a static binary— intermediate libraries were introducing the dynamic dependency when -static was only set at the final linking stage.

Comment 7 Fedora End Of Life 2013-07-04 05:48:49 UTC
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Comment 8 Fedora End Of Life 2013-08-01 17:03:26 UTC
Fedora 17 changed to end-of-life (EOL) status on 2013-07-30. Fedora 17 is 
no longer maintained, which means that it will not receive any further 
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