meson: refuse -ffinite-math-only

Closes #23610.

diff --git a/meson.build b/meson.build
index 5d7c8699fe0d057855569f25ec1ceedf05a52e8a..61073d4eadb2799f715b46ed856fb7d6908e64ae 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -390,6 +390,11 @@ possible_common_cc_flags = [
 
 c_args = get_option('c_args')
 
+# Our json library does not support -ffinite-math-only, which is enabled by -Ofast or -ffast-math.
+if (('-Ofast' in c_args or '-ffast-math' in c_args or '-ffinite-math-only' in c_args) and not '-fno-finite-math-only' in c_args)
+        error('-Ofast, -ffast-math, or -ffinite-math-only is specified in c_args.')
+endif
+
 # Disable -Wmaybe-uninitialized when compiling with -Os/-O1/-O3/etc. There are
 # too many false positives with gcc >= 8. Effectively, we only test with -O0
 # and -O2; this should be enough to catch most important cases without too much