1  linux_CFLAGS=
 2  linux_CXXFLAGS=
 3  
 4  ifneq ($(LTO),)
 5  linux_AR = $(host_toolchain)gcc-ar
 6  linux_NM = $(host_toolchain)gcc-nm
 7  linux_RANLIB = $(host_toolchain)gcc-ranlib
 8  endif
 9  
10  linux_release_CFLAGS=-O2
11  linux_release_CXXFLAGS=$(linux_release_CFLAGS)
12  
13  linux_debug_CFLAGS=-O1 -g
14  linux_debug_CXXFLAGS=$(linux_debug_CFLAGS)
15  
16  # https://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode.html
17  linux_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC
18  
19  # https://libcxx.llvm.org/Hardening.html
20  linux_debug_CPPFLAGS+=-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG
21  
22  ifeq (86,$(findstring 86,$(build_arch)))
23  i686_linux_CC=gcc -m32
24  i686_linux_CXX=g++ -m32
25  i686_linux_AR=ar
26  i686_linux_RANLIB=ranlib
27  i686_linux_NM=nm
28  i686_linux_STRIP=strip
29  
30  x86_64_linux_CC=gcc -m64
31  x86_64_linux_CXX=g++ -m64
32  x86_64_linux_AR=ar
33  x86_64_linux_RANLIB=ranlib
34  x86_64_linux_NM=nm
35  x86_64_linux_STRIP=strip
36  else
37  i686_linux_CC=$(default_host_CC) -m32
38  i686_linux_CXX=$(default_host_CXX) -m32
39  x86_64_linux_CC=$(default_host_CC) -m64
40  x86_64_linux_CXX=$(default_host_CXX) -m64
41  endif
42  
43  linux_cmake_system_name=Linux
44  # Refer to doc/dependencies.md for the minimum required kernel.
45  linux_cmake_system_version=3.17.0