[libcxx-commits] [libcxx] [libc++] Reduce the number of warnings when running SPEC (PR #160366)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne created https://github.com/llvm/llvm-project/pull/160366

Using -Wall and -Wextra when building SPEC leads to extremely large log files. Since we don't actually care about warnings in these benchmarks, this patches tones down the number of warnings a bit.

>From 33313ae0e2761d64e76990e914d1241f7b93aade Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne.2 at gmail.com>
Date: Tue, 23 Sep 2025 11:57:04 -0400
Subject: [PATCH] [libc++] Reduce the number of warnings when running SPEC

Using -Wall and -Wextra when building SPEC leads to extremely large
log files. Since we don't actually care about warnings in these
benchmarks, this patches tones down the number of warnings a bit.
---
 libcxx/test/benchmarks/spec.gen.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libcxx/test/benchmarks/spec.gen.py b/libcxx/test/benchmarks/spec.gen.py
index ea7b75b3d2085..de7c14db5ad8e 100644
--- a/libcxx/test/benchmarks/spec.gen.py
+++ b/libcxx/test/benchmarks/spec.gen.py
@@ -28,6 +28,9 @@
 link_flags = (test_dir / 'link_flags.subs').open().read().strip()
 spec_dir = pathlib.Path((test_dir / 'spec_dir.subs').open().read().strip())
 
+# Remove -Wall, -Wextra and -Werror from the flags since we don't care about enabling all warnings inside SPEC
+compile_flags = compile_flags.replace('-Wall', '').replace('-Wextra', '').replace('-Werror', '')
+
 # Setup the configuration file
 test_dir.mkdir(parents=True, exist_ok=True)
 spec_config = test_dir / 'spec-config.cfg'
@@ -46,7 +49,7 @@
     copies               = 1
     threads              = 1
     CC                   = cc -O3
-    CXX                  = {cxx} {compile_flags} {flags} {link_flags} -Wno-error
+    CXX                  = {cxx} {compile_flags} {flags} {link_flags}
     CC_VERSION_OPTION    = --version
     CXX_VERSION_OPTION   = --version
     EXTRA_PORTABILITY    = -DSPEC_NO_CXX17_SPECIAL_MATH_FUNCTIONS # because libc++ doesn't implement the special math functions yet