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debug/gdb: Add comments for untrivial flags.

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The necessity of --without-libexpat-prefix is not
obvious and needs comments.

Signed-off-by: Kirill K. Smirnov <kirill.k.smirnov@gmail.com>
This commit is contained in:
Kirill K. Smirnov 2016-09-12 01:13:55 +03:00
parent 5fd69f7652
commit f64f561e6f
1 changed files with 14 additions and 0 deletions
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14
scripts/build/debug/300-gdb.sh
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@ -68,6 +68,10 @@ do_debug_gdb_build() {
cd "${CT_BUILD_DIR}/build-gdb-cross"
cross_extra_config=("${extra_config[@]}")
# For gdb-cross this combination of flags forces
# gdb configure to fall back to default '-lexpat' flag
# which is acceptable.
cross_extra_config+=("--with-expat")
cross_extra_config+=("--without-libexpat-prefix")
@ -169,6 +173,16 @@ do_debug_gdb_build() {
native_extra_config+=("--with-curses")
fi
# Target libexpat resides in sysroot and does not have
# any dependencies, so just passing '-lexpat' to gcc is enough.
#
# By default gdb configure looks for expat in '$prefix/lib'
# directory. In our case '$prefix/lib' resolves to '/usr/lib'
# where libexpat for build platform lives, which is
# unacceptable for cross-compiling.
#
# To prevent this '--without-libexpat-prefix' flag must be passed.
# Thus configure falls back to '-lexpat', which is exactly what we want.
native_extra_config+=("--with-expat")
native_extra_config+=("--without-libexpat-prefix")