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playground-cpp

A Playground for C++

CFLAGS

1. -D macro => current directory => -I path
2. Environment Variables => CPATH / C_INCLUDE_PATH / CPLUS_INCLUDE_PATH / OBJC_INCLUDE_PATH
3. /usr/include => /usr/local/include => /usr/lib/gcc/x86_64-xxxxxx => .....

LDFLAGS

1. -L
2. LIBRARY_PATH
3. /usr/local/lib => /lib/x86_64-linux-gnu => /usr/lib/x86_64-linux-gnu => /lib => /usr/lib

ref: https://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html

pkg-config

• PKG_CONFIG_PATH

ref: https://linux.die.net/man/1/pkg-config

load and run

• add LIBRARY to the 'LD_PRELOAD' enrironment variable when need preload
• add LIBDIR to the 'LD_LIBRARY_PATH' environment variable during execution
• add LIBDIR to the 'LD_RUN_PATH' environment variable during linking
• use the '-Wl,-rpath -Wl,LIBDIR' linker flag
• have your system administrator add LIBDIR to '/etc/ld.so.conf'

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Some influential environment variables:

• CC C compiler command
• CFLAGS C compiler flags
• LDFLAGS linker flags, e.g. -L<lib dir> if you have libraries in a
  nonstandard directory <lib dir>
• LIBS libraries to pass to the linker, e.g. -l<library>
• CPPFLAGS (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
  you have headers in a nonstandard directory
• CPP C preprocessor
• CXX C++ compiler command
• CXXFLAGS C++ compiler flags

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apt-file list libc++-dev >> ~/temp.txt && vim ~/temp.txt => :%g!/.a$/d

• libc++-dev: /usr/lib/x86_64-linux-gnu/libc++.a
• libc++-dev: /usr/lib/x86_64-linux-gnu/libc++experimental.a

apt-file list libc6-dev >> ~/temp.txt && vim ~/temp.txt => :%g!/.a$/d

• libc6-dev: /usr/lib/x86_64-linux-gnu/libBrokenLocale.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libanl.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libc.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libc_nonshared.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libcrypt.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libdl.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libg.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libm-2.27.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libm.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libmcheck.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libmvec.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libmvec_nonshared.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libnsl.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libpthread.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libpthread_nonshared.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libresolv.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/librpcsvc.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/librt.a
• libc6-dev: /usr/lib/x86_64-linux-gnu/libutil.a

musl-1.1.19 => ./configure --disable-shared

• Scrt1.o
• crt1.o
• crti.o
• crtn.o
• rcrt1.o
• libc.a
• libcrypt.a
• libdl.a
• libm.a
• libpthread.a
• libresolv.a
• librt.a
• libutil.a
• libxnet.a
• musl-gcc.specs

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