Bobby Bruce has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/69597?usp=email )
Change subject: scons: Add '-lstdc++fs' to LIBS env when GCC version < 9
......................................................................
scons: Add '-lstdc++fs' to LIBS env when GCC version < 9
This commit is in response to a failure in the compiler tests:
https://jenkins.gem5.org/job/compiler-checks/570/
GCC versions <9 failed to compile gem5 with the following error:
```
socket.cc:(.text+0x32d5): undefined reference to
`std::filesystem::__cxx11::path::_M_split_cmpts()'
socket.cc:(.text+0x32e5): undefined reference to
`std::filesystem::create_directory(std::filesystem::__cxx11::path const&,
std::error_code&)'
socket.cc:(.text+0x3370): undefined reference to
`std::filesystem::current_path[abi:cxx11](std::error_code&)'
socket.cc:(.text+0x33cc): undefined reference to
`std::filesystem::__cxx11::path::_M_split_cmpts()'
socket.cc:(.text+0x33d7): undefined reference to
`std::filesystem::current_path(std::filesystem::__cxx11::path const&,
std::error_code&)'
socket.cc:(.text+0x3468): undefined reference to
`std::filesystem::current_path(std::filesystem::__cxx11::path const&,
std::error_code&)'
```
This was due to this patch:
https://gem5-review.googlesource.com/c/public/gem5/+/69164 which
utilized `std::filesystem`. Prior to to GCC v9, explicit linking with
the stdc++fs library is required due to `std::filesystem` being an
experimental implementation prior to GGC v9.
Change-Id: I584e29f100cb59b40bd155c212e1814f6d8fbb99
---
M SConstruct
1 file changed, 11 insertions(+), 0 deletions(-)
diff --git a/SConstruct b/SConstruct
index 7d6f406..e91e700 100755
--- a/SConstruct
+++ b/SConstruct
@@ -483,6 +483,17 @@
'-fno-builtin-malloc', '-fno-builtin-calloc',
'-fno-builtin-realloc', '-fno-builtin-free'])
+ if compareVersions(env['CXXVERSION'], "9") < 0:
+ # `libstdc++fs`` must be explicitly linked for
`std::filesystem``
+ # in GCC version 8. As of GCC version 9, this is not required.
+ #
+ # In GCC 7 the `libstdc++fs`` library explicit linkage is also
+ # required but the `std::filesystem` is under the
`experimental`
+ # namespace(`std::experimental::filesystem`).
+ #
+ # Note: gem5 does not support GCC versions < 7.
+ env.Append(LIBS=['stdc++fs'])
+
elif env['CLANG']:
if compareVersions(env['CXXVERSION'], "6") < 0:
error('clang version 6 or newer required.\n'
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I584e29f100cb59b40bd155c212e1814f6d8fbb99
Gerrit-Change-Number: 69597
Gerrit-PatchSet: 1
Gerrit-Owner: Bobby Bruce <bbr...@ucdavis.edu>
Gerrit-MessageType: newchange
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