mk: Request -march=i686 on i686 Linux

Apparently the gcc on our dist bot is so old and/or obscure that the default
`-m32` switch doesn't think it can generate i686 code (or something like that).
The compiler-rt build system probes for the `__i686__` define in GCC to compile
for an i686 (vs i386) target, so this was failing on the bots.

This tweaks instead to pass `-march=i686` on i686-unknown-linux-gnu to C code to
ensure that we're compiling for i686 instead of i386. This should hopefully not
actually have an impact other than maybe doing some random optimization it
wasn't able to do so before. In theory this isn't making the target less
compatible as all Rust code is already compiled for i686.

Hopefully closes #34572

diff --git a/mk/cfg/i686-unknown-linux-gnu.mk b/mk/cfg/i686-unknown-linux-gnu.mk
index 88c0907f63b2ac8f8be2e4d30078d31fe75db184..129af8ac69609396b0b31cd496f294e0e9ed4d18 100644 (file)
--- a/mk/cfg/i686-unknown-linux-gnu.mk
+++ b/mk/cfg/i686-unknown-linux-gnu.mk
@@ -8,7 +8,7 @@ CFG_STATIC_LIB_NAME_i686-unknown-linux-gnu=lib$(1).a
 CFG_LIB_GLOB_i686-unknown-linux-gnu=lib$(1)-*.so
 CFG_LIB_DSYM_GLOB_i686-unknown-linux-gnu=lib$(1)-*.dylib.dSYM
 CFG_JEMALLOC_CFLAGS_i686-unknown-linux-gnu := -m32 $(CFLAGS)
-CFG_GCCISH_CFLAGS_i686-unknown-linux-gnu := -Wall -Werror -g -fPIC -m32 $(CFLAGS)
+CFG_GCCISH_CFLAGS_i686-unknown-linux-gnu := -Wall -Werror -g -fPIC -m32 $(CFLAGS) -march=i686
 CFG_GCCISH_CXXFLAGS_i686-unknown-linux-gnu := -fno-rtti $(CXXFLAGS)
 CFG_GCCISH_LINK_FLAGS_i686-unknown-linux-gnu := -shared -fPIC -ldl -pthread  -lrt -g -m32
 CFG_GCCISH_DEF_FLAG_i686-unknown-linux-gnu := -Wl,--export-dynamic,--dynamic-list=