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説明
On Linux systems which use glibc ≥2.30 the following will be logged during compilation:
In file included from arch/arch_info.c:52:0: /usr/include/sys/sysctl.h:21:2: error: #warning "The <sys/sysctl.h> header is deprecated and will be removed." [-Werror=cpp] #warning "The <sys/sysctl.h> header is deprecated and will be removed." ^~~~~~~ cc1: all warnings being treated as errors
The release notes for glibc 2.30 read:
“The Linux-specific <sys/sysctl.h> header and the sysctl function have been deprecated and will be removed from a future version of glibc. Application should directly access /proc instead. For obtaining random bits, the getentropy function can be used.”
(See also https://sourceware.org/ml/libc-alpha/2019-08/msg00029.html for the full release notes.)
To Reproduce
1 install glibc and glibc-dev / glibc-devel >= 2.30
2 compile ltfs v. 2.4.5.0 :
./autogen.sh
./configure --prefix=$1 --enable-message-checker --enable-warning-as-error
make
Solution
Because of the deprecated sysctl() function, sysconf() should be used instead.
Source file src/libltfs/arch/arch_info.c