Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
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Snippet: 
FAILED: src/basic/libbasic.a.p/mountpoint-util.c.o 
gcc -Isrc/basic/libbasic.a.p -Isrc/basic -I../src/basic -Isrc/fundamental -I../src/fundamental -Isrc/systemd -I../src/systemd -I. -I.. -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -Werror -std=gnu17 -Wno-missing-field-initializers -Wno-unused-parameter -Wno-nonnull-compare -Warray-bounds -Warray-bounds=2 -Wdate-time -Wendif-labels -Werror=bool-compare -Werror=discarded-qualifiers -Werror=flex-array-member-not-at-end -Werror=format=2 -Werror=format-signedness -Werror=implicit-function-declaration -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Werror=missing-declarations -Werror=missing-prototypes -Werror=overflow -Werror=override-init -Werror=pointer-sign -Werror=return-type -Werror=shift-count-overflow -Werror=shift-overflow=2 -Werror=strict-flex-arrays -Werror=undef -Wfloat-equal -Wimplicit-fallthrough=5 -Winit-self -Wlogical-op -Wmissing-include-dirs -Wmissing-noreturn -Wnested-externs -Wold-style-definition -Wpointer-arith -Wredundant-decls -Wshadow -Wstrict-aliasing=2 -Wstrict-prototypes -Wsuggest-attribute=noreturn -Wunterminated-string-initialization -Wunused-function -Wwrite-strings -Wzero-as-null-pointer-constant -Wzero-length-bounds -fdiagnostics-show-option -fno-common -fstack-protector -fstack-protector-strong -fstrict-flex-arrays=3 --param=ssp-buffer-size=4 -Wno-maybe-uninitialized -Wno-unused-result -ftrivial-auto-var-init=zero -Werror=shadow -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fPIC -fno-strict-aliasing -fstrict-flex-arrays=1 -fvisibility=hidden -ffunction-sections -fdata-sections -include config.h -pthread -isystem../src/basic/include -fvisibility=default -MD -MQ src/basic/libbasic.a.p/mountpoint-util.c.o -MF src/basic/libbasic.a.p/mountpoint-util.c.o.d -o src/basic/libbasic.a.p/mountpoint-util.c.o -c ../src/basic/mountpoint-util.c
../src/basic/mountpoint-util.c: In function âfd_fdinfo_mnt_idâ:
../src/basic/mountpoint-util.c:167:26: error: âpâ undeclared (first use in this function)
  167 |         return safe_atoi(p, ret_mnt_id);
      |                          ^
../src/basic/mountpoint-util.c:167:26: note: each undeclared identifier is reported only once for each function it appears in
Build failed during code compilation with undeclared variable `p`.