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IPO: Use -flto=auto if compiler is GCC >= 10.1

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Since GCC 12.1, the `-flto` option warns unless given an explicit
LTRANS job count.

Issue: #23640
This commit is contained in:
Linus Dierheimer
2022-06-22 14:32:54 +02:00
committed by Brad King
parent aae6a67e5c
commit fe57410b33
1 changed files with 12 additions and 1 deletions
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Modules/Compiler/GNU.cmake
+12 -1
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@@ -72,7 +72,18 @@ macro(__compiler_gnu lang)
# * https://gcc.gnu.org/onlinedocs/gcc-4.5.4/gcc/Option-Summary.html (yes)
if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.5)
set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
set(__lto_flags -flto)
set(__lto_flags "")
# '-flto=auto' introduced since GCC 10.1:
# * https://gcc.gnu.org/onlinedocs/gcc-9.5.0/gcc/Optimize-Options.html#Optimize-Options (no)
# * https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Optimize-Options.html#Optimize-Options (yes)
# Since GCC 12.1, the abundance of a parameter produces a warning if compiling multiple targets.
if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 10.1)
list(APPEND __lto_flags -flto=auto)
else()
list(APPEND __lto_flags -flto)
endif()
if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.7)
# '-ffat-lto-objects' introduced since GCC 4.7: