-ffile-prefix-map is supposed to be a superset of -fmacro-prefix-map
and -fdebug-prefix-map. However, when building .S or .s files, gas is
not called with the appropriate --debug-prefix-map option when
-ffile-prefix-map is used.
While the user can specify -fdebug-prefix-map when building assembly
files via gcc, it's more ergonomic to also support -ffile-prefix-map;
especially since for .S files that could contain the __FILE__ macro,
one would then also have to specify -fmacro-prefix-map.
gcc:
PR driver/93371
* gcc.cc (ASM_MAP): Honour -ffile-prefix-map.
---
I've tested that this works as expected, both by looking at how gas is
now invoked, and by running 'strings' on the generated .o file. But I
don't know how to add something to the testsuite for this.
I stumbled on this since it came up on the U-Boot mailing list:
https://lore.kernel.org/u-boot/4ed9f811-5244-54ef-b58e-83dba5151...@prevas.dk/
.
gcc/gcc.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/gcc.cc b/gcc/gcc.cc
index b6d562a92f0..44eafc60187 100644
--- a/gcc/gcc.cc
+++ b/gcc/gcc.cc
@@ -878,7 +878,7 @@ proper position among the other output files. */
#endif
#ifdef HAVE_AS_DEBUG_PREFIX_MAP
-#define ASM_MAP " %{fdebug-prefix-map=*:--debug-prefix-map %*}"
+#define ASM_MAP " %{ffile-prefix-map=*:--debug-prefix-map %*}
%{fdebug-prefix-map=*:--debug-prefix-map %*}"
#else
#define ASM_MAP ""
#endif
--
2.37.2
