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configure: use AC_PATH_TOOL for pkg-config

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AC_CHECK_PROGS will find the tool using exactly the name given: it
only searches for "pkg-config".  When doing native builds, this is
generally fine.  However, when cross-compiling, this is not ideal
as `pkg-config` is often configured for the build system, not the
system we want to cross-compile for.

Switch to using the AC_PATH_TOOL tool instead.  This will look for
"pkg-config" with a $host- prefix first before falling back to the
plain "pkg-config".  When doing native builds, things should still
behave the same, but now things work better out of the box when we
cross-compile.

For example, `./configure --host=aarch64-linux-gnu` will first look
for "aarch64-linux-gnu-pkg-config" before falling back to the plain
"pkg-config".
This commit is contained in:
Mike Frysinger 2020-06-12 19:08:29 -04:00 • committed by Mike Frysinger
commit e9a21197ec
1 changed files with 1 additions and 1 deletions
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2
configure.ac
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@ -459,7 +459,7 @@ else
alllang_default=yes
fi
AC_CHECK_PROGS([PKG_CONFIG], [pkg-config])
AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
#--------------------------------------------------------------------
# Look for Tcl