https://llvm.org/bugs/show_bug.cgi?id=31324
Bug ID: 31324
Summary: Defines from command line override defines from pch:
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: nicolaswe...@gmx.de
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
$ cat foo.h
#define __STDC_HOSTED__ "hi"
$ cat foo.c
const char* s = __STDC_HOSTED__;
$ bin/clang -cc1 -emit-pch -o foo.h.pch foo.h
foo.h:1:9: warning: '__STDC_HOSTED__' macro redefined
#define __STDC_HOSTED__ "hi"
^
<built-in>:307:9: note: previous definition is here
#define __STDC_HOSTED__ 1
^
1 warning generated.
$ bin/clang -cc1 -D__STDC_HOSTED__=4 -include-pch foo.h.pch -emit-obj -o foo.o
foo.c
<built-in>:1:9: warning: '__STDC_HOSTED__' macro redefined
#define __STDC_HOSTED__ 4
^
/Users/thakis/src/llvm-build/foo.h:1:9: note: previous definition is here
#define __STDC_HOSTED__ "hi"
^
foo.c:1:13: warning: incompatible integer to pointer conversion initializing
'const char *' with an expression of type 'int'
const char* s = __STDC_HOSTED__;
^ ~~~~~~~~~~~~~~~
2 warnings generated.
But:
$ bin/clang -cc1 -D__STDC_HOSTED__=4 -include foo.h -emit-obj -o foo.o foo.c
In file included from <built-in>:311:
<command line>:1:9: warning: '__STDC_HOSTED__' macro redefined
#define __STDC_HOSTED__ 4
^
<built-in>:307:9: note: previous definition is here
#define __STDC_HOSTED__ 1
^
In file included from <built-in>:1:
./foo.h:1:9: warning: '__STDC_HOSTED__' macro redefined
#define __STDC_HOSTED__ "hi"
^
<command line>:1:9: note: previous definition is here
#define __STDC_HOSTED__ 4
^
2 warnings generated.
(Noticed by Richard Smith in https://reviews.llvm.org/D27545)
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