http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57191
Bug #: 57191
Summary: GCC cross-compilers built with MinGW do no include
correct directory
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: matthews.grochowal...@ge.com
It appears MinGW always overrides the definition of NATIVE_SYSTEM_HEADER_DIR
given on the command line. Running:
echo "NATIVE_SYSTEM_HEADER_DIR" | cpp -DNATIVE_SYSTEM_HEADER_DIR=/usr/include
produces:
c:/MinGW2/msys/1.0/include
I believe this change was introduced as a fix for bug 52947.
When building gcc with the "--with-sysroot" config option,
NATIVE_SYSTEM_HEADER_DIR is supposed to be defined as the TARGET system's
default include directory in gcc/cppdefault.c. In my case, this would be
/usr/include as I'm targeting GNU/Linux.
"-DNATIVE_SYSTEM_HEADER_DIR=/usr/include" is being passed to the build system
gcc (i686-pc-mingw32-gcc).
Because of MinGW's silent changing of NATIVE_SYSTEM_HEADER_DIR, the resulting
cross-compiler tries to look in $SYSROOTc:/MinGW2/msys/1.0/include for the
target system includes instead of $SYSROOT/usr/include.
