I'm having header file header.h:
#define TEST_VALUE 1
#define TEST_STRING "hello world"
and source file source.cpp:
#include "header.h"
#include "stdio.h"
int main() {
printf(TEST_STRING"\n");
}
I've followed clang pch article and performed:
MBA-Anton:pch asmirnov$ clang -cc1 ./header.h -emit-pch -o ./header.pch
MBA-Anton:pch asmirnov$ clang -cc1 -include-pch header.pch source.cpp -o source
error: C99 was enabled in PCH file but is currently disabled
1 error generated.
MBA-Anton:pch asmirnov$ clang -I. source.cpp -o source
MBA-Anton:pch asmirnov$ ls
header.h header.pch source source.cpp
MBA-Anton:pch asmirnov$ ./source
hello world
So i can't link with PCH but i can compile/link source+header. The only difference with clang article's example is i've tried c++ and it's described for c. So i've tried to specify c++ language:
MBA-Anton:pch asmirnov$ clang -cc1 ./header.h -emit-pch -o ./header.pch2 -x c++
MBA-Anton:pch asmirnov$ clang -cc1 -include-pch header.pch2 source.cpp -o source2 -x c++
source.cpp:2:10: fatal error: 'stdio.h' file not found
#include "stdio.h"
^
1 error generated.
MBA-Anton:pch asmirnov$ ls -l
total 496
-rw-r--r-- 1 asmirnov wheel 56 5 ноя 15:31 header.h
-rw-r--r-- 1 asmirnov wheel 112564 5 ноя 15:50 header.pch
-rw-r--r-- 1 asmirnov wheel 116236 5 ноя 15:50 header.pch2
-rwxr-xr-x 1 asmirnov wheel 8456 5 ноя 15:42 source
-rw-r--r-- 1 asmirnov wheel 80 5 ноя 15:32 source.cpp
One more attempt with specifying c++11:
MBA-Anton:pch asmirnov$ clang -cc1 ./header.h -emit-pch -o ./header.pch3 -x c++ -std=c++11
MBA-Anton:pch asmirnov$ clang -cc1 -include-pch header.pch3 source.cpp -o source3 -x c++ -std=c++11
source.cpp:2:10: fatal error: 'stdio.h' file not found
#include "stdio.h"
^
1 error generated.
MBA-Anton:pch asmirnov$ ls -l
total 728
-rw-r--r-- 1 asmirnov wheel 56 5 ноя 15:31 header.h
-rw-r--r-- 1 asmirnov wheel 112564 5 ноя 15:50 header.pch
-rw-r--r-- 1 asmirnov wheel 116236 5 ноя 15:54 header.pch2
-rw-r--r-- 1 asmirnov wheel 117132 5 ноя 15:57 header.pch3
-rwxr-xr-x 1 asmirnov wheel 8456 5 ноя 15:42 source
-rw-r--r-- 1 asmirnov wheel 80 5 ноя 15:57 source.cpp
I'm not trying to add -I since i'm able to compile/link with clang -I. source.cpp -o source
and include paths are (should be) the same.
PS.
MBA-Anton:pch asmirnov$ clang --version
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.3.0
Thread model: posix
I've solved it:
MBA-Anton:pch asmirnov$ clang++ -x c++-header header.h -emit-pch -o header.pch
MBA-Anton:pch asmirnov$ clang++ -include-pch header.pch source.cpp -o source -x c++
BTW, if i rename header.h and try to link executable, i get error:
MBA-Anton:pch asmirnov$ clang++ -include-pch header.pch source.cpp -o source -x c++
fatal error: malformed or corrupted AST file: 'could not find file '/tmp/pch/header.h' referenced by
AST file'
1 error generated.
It means it still needs header file! Is it expected behaviour?
PS2. I've tried to add one more header to .pch and failed:
MBA-Anton:pch asmirnov$ clang++ -x c++-header header.h header2.h -emit-pch -o headers.pch
clang: error: cannot specify -o when generating multiple output files
Created separate SO question about it: How to generate .pch for lots of headers?
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