在ubuntu22.04上打算编译下nuc972的bsp，结果报错：
c-stack.c:55:26: error: missing binary operator before token "("
55 | #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384网上搜了下，搜到这个：
https://blog.csdn.net/weixin_45647912/article/details/123768601
提示升级host-m4版本即可，由m4-1.4.18升级为m4-1.4.19即可。
但是，如何升级这个host-m4呢？我删除dl目录下的m4-1.4.18.tar.xz，下载m4-1.4.19.tar.xz放进去，结果make时还是会自动下载1.4.18。
也不知道这个是在哪里指定版本的？
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修改package/m4下的m4.mk和m4.hash
感谢。修改后：
m4.mk:
################################################################################
#
# m4
#
################################################################################
M4_VERSION = 1.4.19
M4_SOURCE = m4-$(M4_VERSION).tar.xz
M4_SITE = $(BR2_GNU_MIRROR)/m4
M4_LICENSE = GPL-3.0+
M4_LICENSE_FILES = COPYING
$(eval $(host-autotools-package))m4.hash:
# Locally calculated after checking pgp signature
sha256 63aede5c6d33b6d9b13511cd0be2cac046f2e70fd0a07aa9573a04a82783af96 m4-1.4.19.tar.xz
# License files, locally calculated
sha256 3972dc9744f6499f0f9b2dbf76696f2ae7ad8af9b23dde66d6af86c9dfb36986 COPYING手动下载m4-1.4.19.tar.xz放到dl目录下，能正确解压了，但是后续还是会有报错：
Applying 0001-fflush-adjust-to-glibc-2.28-libio.h-removal.patch using patch:
Error: duplicate filename '0001-fflush-adjust-to-glibc-2.28-libio.h-removal.patch'
Conflicting files are:
already applied: /home/xxx/NUC970_Buildroot/package/m4/0001-fflush-adjust-to-glibc-2.28-libio.h-removal.patch
to be applied : /home/xxx/NUC970_Buildroot/package/m4/0001-fflush-adjust-to-glibc-2.28-libio.h-removal.patch
make[1]: *** [package/pkg-generic.mk:184：/home/any/MPU/nuc970bsp/20200318/NUC970_Buildroot/output/build/host-m4-1.4.19/.stamp_patched] 错误 1
make: *** [Makefile:76：_all] 错误 2意思三0001--fflush-adjust-to-glibc-2.28-libio.h-removal.pathch文件重复了？但是我搜了当前目录，只有一个文件。
-------------------------------------------------
不对，第一次报错时是这个错误：
Applying 0002-fflush-be-more-paranoid-about-libio.h-change.patch using patch:
patching file lib/fflush.c
Reversed (or previously applied) patch detected! Skipping patch.
3 out of 3 hunks ignored -- saving rejects to file lib/fflush.c.rej
patching file lib/fpending.c
Reversed (or previously applied) patch detected! Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file lib/fpending.c.rej
patching file lib/fpurge.c
Reversed (or previously applied) patch detected! Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file lib/fpurge.c.rej
patching file lib/freadahead.c
Reversed (or previously applied) patch detected! Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file lib/freadahead.c.rej
patching file lib/freading.c
Reversed (or previously applied) patch detected! Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file lib/freading.c.rej
patching file lib/fseeko.c
Reversed (or previously applied) patch detected! Skipping patch.
2 out of 2 hunks ignored -- saving rejects to file lib/fseeko.c.rej再次make时才会报文件名重复这个错误。
-------------------------------------------------------------
手动把报错的那个文件删除，再次make，又有个类似的报错，但文件名不一样，再删再make，貌似可以了。
最近编辑记录 Gentlepig (2023-02-13 14:20:08)
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往下继续，报错还是挺多：
../../gcc/reload1.c: In function ‘void init_reload()’:
../../gcc/reload1.c:89:24: error: use of an operand of type ‘bool’ in ‘operator++’ is forbidden in C++17
89 | (this_target_reload->x_spill_indirect_levels)
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
../../gcc/reload1.c:443:7: note: in expansion of macro ‘spill_indirect_levels’
443 | spill_indirect_levels++;---------------------------------------------------
没搜到解决办法，gcc4.8.5换gcc4.9.0，暂时能往下进行。就是有个问题，我板子上的根文件系统，是用gcc4.8.5制作的，现在PC上交叉编译器环城gcc4.9.0，不知道会遇到什么问题。
-------------------------------------------------
晕，换gcc4.9.0，最后还是会报上边那个错误。
-----------------------------------------------------------
换gcc5，报同样错误。
换gcc6，报以下错误：
../../gcc/ubsan.c: In function ‘bool ubsan_use_new_style_p(location_t)’:
../../gcc/ubsan.c:1472:20: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
1472 | || xloc.file == '\0' || xloc.file[0] == '\xff'最近编辑记录 Gentlepig (2023-02-13 15:07:58)
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搜到了这个帖子：
http://fuqiang1986.com/2022/07/22/%E5%85%A8%E5%BF%97%E5%93%AA%E5%90%92d1%E5%BC%80%E5%8F%91%E6%9D%BF%E4%BB%A3%E7%A0%81%E4%B8%8B%E8%BD%BD%E7%BC%96%E8%AF%91%E4%B8%8E%E8%B0%83%E8%AF%95/
buildroot提供了003xxxxxxx.pathc，打上这个补丁就可以解决这个问题。
我是下载到了output/build/host-m4xxx/这个目录下，然后git apply xxxx.patch。
然后就是我在3#遇到的那个问题，还未解决：
../../gcc/reload1.c: In function ‘void init_reload()’:
../../gcc/reload1.c:89:24: error: use of an operand of type ‘bool’ in ‘operator++’ is forbidden in C++17
89 | (this_target_reload->x_spill_indirect_levels)--------------------------------------------------------------------
在gcc/reload1.c里的443行，找到了对应的x_spill_indirect_levels++那一行，改成这样：
while (memory_address_p (QImode, tem))
{
// spill_indirect_levels++;
spill_indirect_levels = spill_indirect_levels + 1;
tem = gen_rtx_MEM (Pmode, tem);
}-----------------------------------------
又遇到找不到 _STAT_VER 定义。
error: '_STAT_VER' undeclared (first use in this function)99 | #define INT_NEXT_STAT(a,b) NEXT_STAT64(_STAT_VER,a,b和上上个问题类似，找fakeroot的002xxx.patch补丁。
https://git.buildroot.org/buildroot/tree/package/fakeroot?id=5a9504831f3fa1ef3be334036c93da30150fde55
最近编辑记录 Gentlepig (2023-02-21 16:13:04)
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