/**********************************************************************
* Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/\${ <-- HERE ([^ \t=:+{}]+)}/ at xxxx/usr/bin/automake line 3939.
* 说明：
* 在Ubuntu 18.04上编译Yocto，出现的automake正则表达式问题。原因是Perl
* 不支持以前的写法。
*
* 2018-6-13 深圳 宝安西乡 曾剑锋
*********************************************************************/
一、解决方法：
修改automake源代码
# substitute_ac_subst_variables ($TEXT)
# -------------------------------------
# Replace any occurrence of ${FOO} in $TEXT by @FOO@ if FOO is an AC_SUBST
# variable.
sub substitute_ac_subst_variables
{
my ($text) = @_;
# $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
$text =~ s/\$[{]([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
return $text;
}
二、跟踪信息：
1. 查找source源：
zengjf@zengjf:~/zengjf/fsl-release-bsp/sources$ grep -F '1{s/.* //;s/\.[0-9]+$//};q' * -r
poky/meta/classes/autotools.bbclass: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
2. 查找do_configure生成文件：
zengjf@zengjf:~/zengjf/fsl-release-bsp/imx6q-x11/tmp$ grep -F '1{s/.* //;s/\.[0-9]+$//};q' * -r
[...省略]
work/cortexa9hf-neon-poky-linux-gnueabi/bzip2/1.0.6-r5/temp/run.do_configure.22789: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/cortexa9hf-neon-poky-linux-gnueabi/libtool-cross/2.4.6-r0/temp/run.do_configure.13771: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/gperf-native/3.0.4-r0/temp/run.do_configure.14971: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/flex-native/2.6.0-r0/temp/run.do_configure.12824: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/bison-native/3.0.4-r0/temp/run.do_configure.17557: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/sqlite3-native/3_3.11.0-r0/temp/run.do_configure.9219: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/mpfr-native/3.1.3-r0/temp/run.do_configure.29877: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/pkgconfig-native/0.29+gitAUTOINC+5914edfe96-r0/temp/run.do_configure.15954: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/attr-native/2.4.47-r0/temp/run.do_configure.4567: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/util-macros-native/1_1.19.0-r0/temp/run.do_configure.21344: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/gettext-native/0.19.6-r0/temp/run.do_configure.25061: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/gmp-native/6.1.0-r0/temp/run.do_configure.22886: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/xz-native/5.2.2-r0/temp/run.do_configure.13878: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/libmpc-native/1.0.3-r0/temp/run.do_configure.26652: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
work/x86_64-linux/libtool-native/2.4.6-r0/temp/run.do_configure.5196: AUTOV=`automake --version | sed -e '1{s/.* //;s/\.[0-9]+$//};q'`
zengjf@zengjf:~/zengjf/fsl-release-bsp/imx6q-x11/tmp$
