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Disable strict aliasing on clang (#25067)

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Workaround for #24596.

I also took the liberty to disable it on all targets with GCC, since
their documentation claims that it is also enabled on -Os.

---------

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
This commit is contained in:
bptato
2025-09-19 08:07:43 +02:00
committed by GitHub
parent 87ee9c84cb
commit 3f48576113
1 changed files with 4 additions and 2 deletions
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6
config/nim.cfg
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@@ -257,10 +257,12 @@ clang.objc.options.linker = "-lobjc -lgnustep-base"
gcc.options.linker %= "-L $WIND_BASE/target/lib/usr/lib/ppc/PPC32/common -mrtp -fno-strict-aliasing -D_C99 -D_HAS_C9X -std=c99 -fasm -Wall -Wno-write-strings"
@end
# seqs_v2 violates strict aliasing.
gcc.options.always %= "${gcc.options.always} -fno-strict-aliasing"
# -fno-math-errno is default in OSX, iOS, BSD, Musl, Libm, LLVM, Clang, ICC.
# See https://itnext.io/why-standard-c-math-functions-are-slow-d10d02554e33
# and https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/Optimize-Options.html#Optimize-Options
gcc.options.speed = "-O3 -fno-strict-aliasing -fno-ident -fno-math-errno"
gcc.options.speed = "-O3 -fno-ident -fno-math-errno"
gcc.options.size = "-Os -fno-ident"
@if windows:
gcc.options.debug = "-g3 -Og -gdwarf-3"
@@ -281,7 +283,7 @@ llvm_gcc.options.size = "-Os"
# Configuration for the LLVM CLang compiler:
clang.options.debug = "-g"
clang.cpp.options.debug = "-g"
clang.options.always = "-w -ferror-limit=3"
clang.options.always = "-w -ferror-limit=3 -fno-strict-aliasing"
clang.options.speed = "-O3"
clang.options.size = "-Os"