我试图让scan-build
使用clang而不是gcc进行编译,但出于某种原因scons
总是使用gcc。
如果我执行scons
,我就明白了:
scons: Reading SConscript files ... scons: done reading SConscript files. scons: Building targets ... /usr/bin/clang++ -o src/game.o -c -std=c++1z -pedantic -Wall -Wextra -Werror -O3 src/game.cpp src/game.cpp:13:62: error: unknown type name 'a' constexpr std::array<piece_t, game::pieces_num> game::pieces;a ^ src/game.cpp:15:7: error: constructor cannot have a return type game::game() noexcept { ^~~~ src/game.cpp:16:5: error: use of undeclared identifier 'regen_pieces' regen_pieces(); ^ 3 errors generated. scons: *** [src/game.o] Error 1 scons: building terminated because of errors.
如您所见,它正确使用clang++
代替g++
。我使用this问题中的答案实现了这一点。
但是,如果我执行scan-build scons
,我会得到这个:
scan-build: Using '/usr/bin/clang-4.0' for static analysis scons: Reading SConscript files ... scons: done reading SConscript files. scons: Building targets ... /usr/bin/../lib/clang/c++-analyzer -o src/game.o -c -std=c++1z -pedantic -Wall -Wextra -Werror -O3 src/game.cpp src/game.cpp:13:62: error: 'a' does not name a type constexpr std::array<piece_t, game::pieces_num> game::pieces;a ^ scons: *** [src/game.o] Error 1 scons: building terminated because of errors. scan-build: Removing directory '/tmp/scan-build-2017-04-27-213151-27247-1' because it contains no reports. scan-build: No bugs found.
由于错误消息不同,scan-build
使用gcc而不是clang。
以下是我的环境变量的输出:
$ printenv | grep clang
CC=/usr/bin/clang
CXX=/usr/bin/clang++
我的SConstruct
文件:
import os
env = Environment()
env["CC"] = os.getenv("CC") or env["CC"]
env["CXX"] = os.getenv("CXX") or env["CXX"]
env["ENV"].update(x for x in os.environ.items() if x[0].startswith("CCC_"))
env["ENV"]["TERM"] = os.environ["TERM"]
env.Append(CXXFLAGS = "-std=c++1z -pedantic -Wall -Wextra -Werror -O3")
env.Append(LIBS = ["pthread"])
env.Program("game", ["src/game.cpp", "src/main.cpp"])
所以,我的问题是如何让scan-build
使用clang?
答案 0 :(得分:2)
如果您没有指定编译器,scan-build
将不读取环境变量,而是猜测。在你的情况下,它猜测合适的编译器是gcc。
scan-build
的开发人员正在尝试解决此问题,但与此同时,您必须在构建时明确指定编译器:
$ scan-build --use-c++=clang++ scons