c - No warnings for headers included by headers in non-current directories -

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how can let gcc , clang generate warnings header files included header files in non-current directories? i'm using gcc 4.9.2 , clang 3.6.0.

for example, assume ./include_a.c includes ./dir/a.h, ./dir/a.h includes ./b.h, , ./b.h expected generate warning -wconversion; then, gcc , clang -wconversion not generate expected warning when compile include_a.c. -wconversion -wsystem-headers, expected warning generated, comes many useless warnings system headers. when ./b.h directly included source file in current directory (such ./include_b.c), expected warning generated without -wsystem-headers.

the following shell script reproduces example (the case of clang omitted):

#!/bin/sh  mkdir dir echo '#include "b.h"'                    >dir/a.h echo 'void f() {int = 0; char b = a;}' >b.h  echo '#include "dir/a.h"' >include_a.c echo '#include "b.h"'     >include_b.c  set -x  gcc -c include_a.c -wconversion                  # not generate warning gcc -c include_a.c -wconversion -wsystem-headers # generate warning gcc -c include_b.c -wconversion                  # generate warning

output:

+ gcc -c include_a.c -wconversion + gcc -c include_a.c -wconversion -wsystem-headers in file included dir/a.h:1:0,                  include_a.c:1: ./b.h: in function ‘f’: ./b.h:1:31: warning: conversion ‘char’ ‘int’ may alter value [-wconversion]  void f() {int = 0; char b = a;}                                ^ + gcc -c include_b.c -wconversion in file included include_b.c:1:0: b.h: in function ‘f’: b.h:1:31: warning: conversion ‘char’ ‘int’ may alter value [-wconversion]  void f() {int = 0; char b = a;}                                ^

this behavior seems not bug because gcc , clang perform in same way, how can obtain warnings source files?


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