binutils: fix build of 2.26 when makeinfo is not available

The 2.26 binutils tarball has incorrect timestamps for the .info files,
so binutils build system tries to regenerate them with makeinfo. In
order to avoid depending on host-texinfo, we simply touch the .info
files so that their timestamp is newer than the corresponding source
files.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Tested-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/binutils/binutils.mk

@@ -33,6 +33,17 @@ BINUTILS_DEPENDENCIES += host-flex host-bison host-texinfo
 HOST_BINUTILS_DEPENDENCIES += host-flex host-bison host-texinfo
 endif
 
+# The .info files in the 2.26 tarball have an incorrect timestamp, so
+# binutils tries to re-generate them. In order to avoid the dependency
+# on host-texinfo, we simply update the timestamps.
+ifeq ($(BR2_BINUTILS_VERSION_2_26_X),y)
+define BINUTILS_FIXUP_INFO_TIMESTAMPS
+	find $(@D) -name '*.info' -exec touch {} \;
+endef
+BINUTILS_POST_PATCH_HOOKS += BINUTILS_FIXUP_INFO_TIMESTAMPS
+HOST_BINUTILS_POST_PATCH_HOOKS += BINUTILS_FIXUP_INFO_TIMESTAMPS
+endif
+
 # When binutils sources are fetched from the binutils-gdb repository,
 # they also contain the gdb sources, but gdb shouldn't be built, so we
 # disable it.