[openwrt/openwrt] tools: m4: update to 1.4.20

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/4dc10ec71107f14dbf0d66d855eca43106babb4a

commit 4dc10ec71107f14dbf0d66d855eca43106babb4a
Author: Robert Marko <robimarko at gmail.com>
AuthorDate: Fri May 16 22:10:20 2025 +0200

    tools: m4: update to 1.4.20
    
    New m4 release was made after a long time, for us most importantly
    it ships newer gnulib so it compiles against GCC15 without forcing GNU17.
    
    * Noteworthy changes in release 1.4.20 (2025-05-10) [stable]
    
    ** Fix a bug in the `eval' builtin where it does not suppress warnings
       about division by zero that occurs within a more complex expression on
       the right hand side of || or && (present since short-circuiting was
       introduced in 1.4.8b).
    
    ** The `syscmd' and `esyscmd' builtins no longer mishandle a command line
       starting with `-' or `+' (present since "the beginning").
    
    ** Fix regression introduced in 1.4.19 where trace output (such as with
       `debugmode(t)') could read invalid memory when tracing a series of
       pushed macros that are popped during argument collection.
    
    ** Fix regression introduced in 1.4.19 where the `format' builtin
       inadvertently took on locale-dependent parsing and output of floating
       point numbers as a side-effect of introducing message translations.
       While it would be nice for m4 to be fully locale-aware, such a behavior
       change belongs in a major version release such as 1.6, and not a minor
       release.
    
    ** Fix regression introduced in 1.4.11 where the experimental `changeword'
       builtin could cause a crash if given a regex that does not match all
       one-byte prefixes of valid longer matches.  As a reminder, `changeword'
       is not recommended for production use, and will likely not be present
       in the next major version release.
    
    ** On non-Unix platforms where binary files differ from text, loading a
       frozen file (which should be cross-platform compatible) now correctly
       uses binary mode.
    
    ** Several documentation improvements to the manual.
    
    ** Update to comply with newer C standards, and inherit portability
       improvements from gnulib.
    
    Link: https://github.com/openwrt/openwrt/pull/18821
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 tools/m4/Makefile | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/m4/Makefile b/tools/m4/Makefile
index c13155397d..eaa46ec4f8 100644
--- a/tools/m4/Makefile
+++ b/tools/m4/Makefile
@@ -8,17 +8,16 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=m4
 PKG_CPE_ID:=cpe:/a:gnu:m4
-PKG_VERSION:=1.4.19
+PKG_VERSION:=1.4.20
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
-PKG_HASH:=3be4a26d825ffdfda52a56fc43246456989a3630093cced3fbddf4771ee58a70
+PKG_HASH:=6ac4fc31ce440debe63987c2ebbf9d7b6634e67a7c3279257dc7361de8bdb3ef
 
 HOST_BUILD_PARALLEL:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 
-HOST_CFLAGS += -std=gnu17
 HOST_CONFIGURE_VARS += gl_cv_func_strstr_linear=no
 
 define Host/Uninstall