Sự khác biệt này cung cấp cho bạn một hướng dẫn tốt để sử dụng - nếu bạn muốn sử dụng cờ cho tất cả các ngôn ngữ CPPFLAGS, nếu đó là ngôn ngữ cụ thể, hãy đặt nó vào CFLAGS, CXXFLAGSv.v. Ví dụ về loại sau bao gồm cờ cảnh báo hoặc tuân thủ tiêu chuẩn - bạn sẽ không muốn chuyển -std=c99sang trình biên dịch C ++ của mình!

2004-08-05

CFLAGS Setting CPPFLAGS , CXXFLAGS , and LDFLAGS in configure is bad style. See for example Automake manual 27.6.1 in which they suggest: You should not CPPFLAGS is supposed to be for flags for the C PreProcessor; CXXFLAGS is for flags for the C++ compiler. The default rules in make (on my colorout.hpp $(IMPLS:.cpp=.hpp) CPPFLAGS=-std=c++11 -Wall -Wextra generation %.tab.cpp %.tab.hpp: %.ypp bison -d $< %.output: %.ypp bison -v $< . CXXFLAGS 表示用于C++ 编译器的选项。 CPPFLAGS 可以用于C 和C++ 两者。 Suppress the automatic version number appended to the DLL file name on Windows. suppress_vcproj_warnings, Suppress warnings of the VS project generator.

Closes #17844. GCC optimization — an introduction to optimizing compiled code using safe, sane CFLAGS and CXXFLAGS. Gentoo documentation page on backtraces; CFLAGS_and_CXXFLAGS (AMD64 Handbook) External resources. GCC Online Documentation on GNU.org; GCC x86 performance hints from Intel; List of AMD Microarchitectures with extended info This way, the environment keeps following GNU autoconf standards, and CMake still gets all the tweaks set in `makepkg.conf` (which usually includes `-D_FORTIFY_SOURCE=2` in `CPPFLAGS`, `-fno-plt` in `C*FLAGS` and more secure `LDFLAGS`). If AM_CPPFLAGS is used, then any Bob> per-target CPPFLAGS option completely overrides it.

Currently, quite a few Arduino makefiles use CPPFLAGS (and other custom macros beginning with CPP) as the C++ counterpart for CFLAGS. However, "CPP" in this context means "C preprocessor", not "C plus plus". The right name for C++ flags is CXXFLAGS (think of the X as a turned +). From the Gnu make documentation:

will be appended to CFLAGS. PG_CXXFLAGS. will be appended to CXXFLAGS.

If AM_CPPFLAGS is used, then any Bob> per-target CPPFLAGS option completely overrides it. Thanks for pointing this out. I'm checking this in. 2003-11-25 Alexandre Duret-Lutz * doc/automake.texi (Program variables): Mention per-target _CPPFLAGS in the documentation of …

But I still don't understand the difference. CPPFLAGS vs CXXFLAGS #1. jeroen opened this issue Dec 12, 2016 · 4 comments Assignees. Comments.

I'm checking this in. 2003-11-25 Alexandre Duret-Lutz * doc/automake.texi (Program variables): Mention per-target _CPPFLAGS in the documentation of INCLUDES. LINK.cc = $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) LINK.cpp = $(LINK.cc).
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Unfortunately I don't quite know the full history of OS_CXXFLAGS vs. CXXFLAGS, 2004-08-05 For the best performance, use binaries made for your cpu or compile yourself, using optimized settings for CHOST, CFLAGS, CXXFLAGS The important flags.

I'm checking this in. 2003-11-25 Alexandre Duret-Lutz * doc/automake.texi (Program variables): Mention per-target _CPPFLAGS in the documentation of … 1. A sample makefile and how it works.
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Pass CPPFLAGS to cpp when generating rcdefs.h. Honour user-defined CPPFLAGS when creating rcdefs.h, this notably fixes generating the file with wrong architecture when cross-compiling from 64 to 32 bits with CPPFLAGS=-m32. Closes #17844.

5 sidor · 108 kB — CXXFLAGS="-std=c++11 -stdlib=libc++". CPPFLAGS="-stdlib=libc++".