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autoconf: Print GCC include path directly and be more robust using it

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Rather than constructing the GCC include path from `-print-search-dirs',
we can get the path directly from `-print-file-name=include'. This is
used in the Linux kernel build, for example. If no output is returned
from the command, then we don't append a -I path the the makedepend
options.
This commit is contained in:
Dan Nicholson 2008-03-07 11:48:09 -08:00
parent 1e6943cf55
commit db7fc63110
1 changed files with 5 additions and 4 deletions
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9
configure.ac
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@ -30,12 +30,13 @@ AC_PATH_PROG(MAKE, make)
AC_PATH_PROG(MKDEP, makedepend)
AC_PATH_PROG(SED, sed)
MKDEP_OPTIONS=-fdepend
dnl Ask gcc where it's keeping its secret headers
if test "x$GCC" = xyes; then
GCC_PATH=$(gcc -print-search-dirs | sed -ne 's/install: //p')
MKDEP_OPTIONS="-fdepend -I${GCC_PATH}include"
else
MKDEP_OPTIONS=-fdepend
GCC_INCLUDES=`$CC -print-file-name=include`
if test "x$GCC_INCLUDES" != x; then
MKDEP_OPTIONS="$MKDEP_OPTIONS -I$GCC_INCLUDES"
fi
fi
AC_SUBST(MKDEP_OPTIONS)