1berry/qtbase
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MSVC: Optimize global data to reduce binary size

Browse Source 
Package global data in COMDAT sections for optimization.
According to the docs, this can significantly reduce the
size of the resulting binary executable.

I've tested build Qt with /Gw locally with and without
LTCG, the result shows /Gw can reduce the binary size
indeed, but not "significantly". The result also reveals
that exes can benefit much more from /Gw than dlls.
The result can be seen from the QTBUG-98894 bug report.

Microsoft Docs:
https://docs.microsoft.com/en-us/cpp/build/reference/gw-optimize-global-data?view=msvc-170

Task-number: QTBUG-98894
Change-Id: Ibce34c98e791e519d669a5fe39c0027d1459c382
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
This commit is contained in:
Yuhang Zhao 2021-11-19 11:05:10 +08:00
parent 877d6cf6f6
commit d2a0202cda
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
cmake/QtInternalTargets.cmake
View File

@ -199,7 +199,7 @@ if (MSVC)
target_compile_options(PlatformCommonInternal INTERFACE -Zc:wchar_t)
target_compile_options(PlatformCommonInternal INTERFACE
$<$<NOT:$<CONFIG:Debug>>:-guard:cf>
$<$<NOT:$<CONFIG:Debug>>:-guard:cf -Gw>
)
target_link_options(PlatformCommonInternal INTERFACE