buildgcc: Build GMP `--with-pic` if GCC defaults to `-pie`
GCC 6 can optionally default to building all binaries as position independent executables (PIE). This breaks linking against static libraries that are compiled without position independent code (PIC). Building GMP `--with-pic` in this case seems to be the least fragile solution. TEST=Run `make all` and `make BUILDGCC_OPTIONS=-b build-i386` in util/crossgcc on Debian Stretch. Change-Id: I5f3185af9c8d599379a628e18724b217b88be974 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/17936 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
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@ -515,6 +515,13 @@ set_hostcflags_from_gmp() {
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}
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build_GMP() {
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# Check if GCC enables `-pie` by default (possible since GCC 6).
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# We need PIC in all static libraries then.
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if "${CC}" -dumpspecs 2>/dev/null | grep -q '[{;][[:space:]]*:-pie\>'
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then
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OPTIONS="$OPTIONS --with-pic"
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fi
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CC="$CC" ../${GMP_DIR}/configure --disable-shared --enable-fat \
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--prefix=$TARGETDIR $OPTIONS \
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|| touch .failed
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