Bug 1806545
| Summary: | Precompiled header don't work at all with gcc-8.3.1 (C++) | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Christian Hägele <haegele> |
| Component: | gcc | Assignee: | Marek Polacek <mpolacek> |
| gcc sub component: | system-version | QA Contact: | qe-baseos-tools-bugs |
| Status: | CLOSED WONTFIX | Docs Contact: | |
| Severity: | unspecified | ||
| Priority: | unspecified | CC: | ahajkova, fweimer, haegele, jakub, law, mjtrangoni, ohudlick, sipoyare |
| Version: | 8.3 | Keywords: | Triaged |
| Target Milestone: | rc | Flags: | pm-rhel:
mirror+
|
| Target Release: | 8.0 | ||
| Hardware: | x86_64 | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-03-13 15:55:53 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
I did a stupid copy&paste mistake on the steps to reproduce. Sorry for that.
Here are the correct steps:
1. echo "#include <iostream>" > stdafx.h
2. echo "#include "stdafx.h"
int main() {
std::cout << "Hello World" << std::endl;
return 0; }
" > main.cpp
3. mkdir stdafx.h.gch
4. /usr/bin/c++ -Wall -Wextra -Werror -x c++-header -o stdafx.h.gch/.c++ stdafx.h
5. /usr/bin/c++ -Wall -Wextra -Werror -Winvalid-pch -o main.o -c main.cpp
Looks very much like a duplicate of Bug 1721553. JFTR, the same code compiles on GCC-9 from GCC Toolset. $ sudo dnf install gcc-toolset-9-gcc-c++ $ scl enable gcc-toolset-9 bash $ c++ -Wall -Wextra -Werror -x c++-header -o stdafx.h.gch/.c++ stdafx.h $ c++ -Wall -Wextra -Werror -Winvalid-pch -o main.o -c main.cpp $ c++ --version c++ (GCC) 9.1.1 20190605 (Red Hat 9.1.1-2) Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Yes, that would make sense because I think we don't turn on hardening the compiler and its binaries in DTS 9. Is there any update on this issue? Did I do something wrong or is the current behavior expected? This is expected behavior. GCC's PCH mechanism is fundamentally incompatible with the security hardening requirements for RHEL (PIE in particular). We are currently evaluating the best way to present a more friendly diagnostic for this issue. |
Description of problem: Precompiled-Headers don't work with the system-compiler. Same code compiles on all other platforms I tried. Even with the same Compiler-Version. Version-Release number of selected component (if applicable): gcc (GCC) 8.3.1 20190507 (Red Hat 8.3.1-4) How reproducible: Any C++-Program which tries to use precompiled-headers and uses -Winvalid-pch. I added a minimal example to reproduce. Steps to Reproduce: 1. echo "#include <iostream>" > test.txt 2. echo "#include "stdafx.h" int main() { std::cout << "Hello World" << std::endl; return 0; } " > test.txt 3. mkdir stdafx.h.gch 4. /usr/bin/c++ -Wall -Wextra -Werror -x c++-header -o stdafx.h.gch/.c++ stdafx.h 5. /usr/bin/c++ -Wall -Wextra -Werror -Winvalid-pch -o main.o -c main.cpp Actual results: main.cpp:1:20: error: stdafx.h.gch/.c++: had text segment at different address [-Werror] #include "stdafx.h" ^ Expected results: Compile succeeds without Warnings and Error and is using Precompiled-Headers Additional info: I tested the same code also with DevToolset-8 (GCC-8.3.1)on RHEL7 and also with GCC-8.2.1 on openSUSE Leap 15.1 and it works without problems.