[PATCH V2] Add option to allow disabling inlined xxhash

[Qi.Chen@windriver.com]

From: Chen Qi <Qi.Chen@windriver.com>

xxhash cannot always inline. For example, when using gcc14 and
'-Og' option, xxhash cannot inline. See links below:
https://github.com/Cyan4973/xxHash/commit/574aabad87b2ab9440403e92e1075ef48554eb87
https://github.com/Cyan4973/xxHash/issues/943#issuecomment-2563205130

To allow users successfully build debugedit with gcc14 and "-Og" option,
add an option to allow disabling inlined xxhash.

This patch refers to a similar patch for libabigail:
https://sourceware.org/cgit/libabigail/commit/?id=50497911e2590c21270e0763d277457cf7752c3f

Note that the default remains using inlined xxhash.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 Makefile.am       |  4 ++--
 configure.ac      | 11 +++++++++++
 tools/debugedit.c |  1 -
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 2c8c5c2..2c09e10 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -42,8 +42,8 @@ find-debuginfo: $(top_srcdir)/scripts/find-debuginfo.in Makefile
 
 debugedit_SOURCES = tools/debugedit.c \
 		    tools/hashtab.c 
-debugedit_CFLAGS = @LIBELF_CFLAGS@ @LIBDW_CFLAGS@ $(AM_CFLAGS)
-debugedit_LDADD = @LIBELF_LIBS@ @LIBDW_LIBS@
+debugedit_CFLAGS = @LIBELF_CFLAGS@ @LIBDW_CFLAGS@ @XXHASH_CFLAGS@ $(AM_CFLAGS)
+debugedit_LDADD = @LIBELF_LIBS@ @LIBDW_LIBS@ @XXHASH_LIBS@
 
 sepdebugcrcfix_SOURCES = tools/sepdebugcrcfix.c
 sepdebugcrcfix_CFLAGS = @LIBELF_CFLAGS@ $(AM_CFLAGS)
diff --git a/configure.ac b/configure.ac
index a5a6e28..6b75357 100644
--- a/configure.ac
+++ b/configure.ac
@@ -181,6 +181,17 @@ else
 fi
 AC_SUBST([READELF_VERSION_OK])
 
+ENABLE_INLINED_XXHASH=yes
+AC_ARG_ENABLE(inlined-xxhash,
+	AC_HELP_STRING([--disable-inlined-xxhash], [disable the inlined-only version of xxhash library]),
+	ENABLE_INLINED_XXHASH=$enableval,
+	ENABLE_INLINED_XXHASH=yes)
+
+if test x$ENABLE_INLINED_XXHASH = xyes; then
+	XXHASH_CFLAGS="$XXHASH_CFLAGS -DXXH_INLINE_ALL"
+	XXHASH_LIBS=""
+fi
+
 # And generate the output files.
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
diff --git a/tools/debugedit.c b/tools/debugedit.c
index beefd65..43f9cee 100644
--- a/tools/debugedit.c
+++ b/tools/debugedit.c
@@ -82,7 +82,6 @@ typedef struct Ebl_Strtab	Strtab;
 
 #include "tools/hashtab.h"
 
-#define XXH_INLINE_ALL
 #include "xxhash.h"
 
 #define DW_TAG_partial_unit 0x3c
-- 
2.25.1