gcc: integrate gmp, mpfr, mpc and isl15

To avoid a circular dependency loop between gmp, mpfr, mpc, and isl15
with gcc, integrate these libraries into the build.

[ci skip]

Closes: #10731 [via git-merge-pr]

srcpkgs/gcc/template

@@ -1,15 +1,29 @@
 # Template build file for 'gcc'.
 _majorver=7.2
+_gmp_version=6.1.2
+_mpfr_version=4.0.0
+_mpc_version=1.1.0
+_isl_version=0.16.1
 
 pkgname=gcc
 version=${_majorver}.0
-revision=4
+revision=5
 short_desc="The GNU C Compiler"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 homepage="http://gcc.gnu.org"
 license="GFDL-1.2, GPL-3, LGPL-2.1"
-distfiles="${GNU_SITE}/gcc/gcc-${version}/gcc-${version}.tar.xz"
-checksum=1cf7adf8ff4b5aa49041c8734bbcf1ad18cc4c94d0029aae0f4e48841088479a
+distfiles="
+ ${GNU_SITE}/gcc/gcc-${version}/gcc-${version}.tar.xz
+ https://gmplib.org/download/gmp/gmp-${_gmp_version}.tar.xz
+ http://www.mpfr.org/mpfr-${_mpfr_version}/mpfr-${_mpfr_version}.tar.xz
+ https://ftp.gnu.org/gnu/mpc/mpc-${_mpc_version}.tar.gz
+ http://isl.gforge.inria.fr/isl-${_isl_version}.tar.bz2"
+checksum="
+ 1cf7adf8ff4b5aa49041c8734bbcf1ad18cc4c94d0029aae0f4e48841088479a
+ 87b565e89a9a684fe4ebeeddb8399dce2599f9c9049854ca8c0dfbdea0e21912
+ fbe2cd1418b321f5c899ce4f0f0f4e73f5ecc7d02145b0e1fd096f5c3afb8a1d
+ 6985c538143c1208dcb1ac42cedad6ff52e267b47e5f970183a3e75125b43c2e
+ 412538bb65c799ac98e17e8cfcdacbb257a57362acfaaff254b0fcae970126d2"
 
 nopie=yes
 lib32disabled=yes
@@ -19,7 +33,7 @@ replaces="gcc-gcj<7.2.0 gcc-gcj-jdk-compat<7.2.0"
 if [ "$CHROOT_READY" ]; then
 	hostmakedepends="perl flex"
 fi
-makedepends="zlib-devel libmpc-devel isl15-devel"
+makedepends="zlib-devel"
 depends="binutils libgcc-devel-${version}_${revision}
  libstdc++-devel-${version}_${revision} libssp-devel-${version}_${revision}"
 
@@ -76,6 +90,14 @@ case "$XBPS_TARGET_MACHINE" in
 	*) subpackages+=" libitm libitm-devel";;
 esac
 
+post_extract() {
+	mkdir -p ${wrksrc}/{gmp,mpfr,mpc,isl}
+	cp -ar ${XBPS_BUILDDIR}/gmp-${_gmp_version}/* ${wrksrc}/gmp/
+	cp -ar ${XBPS_BUILDDIR}/mpfr-${_mpfr_version}/* ${wrksrc}/mpfr/
+	cp -ar ${XBPS_BUILDDIR}/mpc-${_mpc_version}/* ${wrksrc}/mpc/
+	cp -ar ${XBPS_BUILDDIR}/isl-${_isl_version}/* ${wrksrc}/isl/
+}
+
 pre_configure() {
 	# _FORTIFY_SOURCE needs an optimization level.
 	sed -i "/ac_cpp=/s/\$CPPFLAGS/\$CPPFLAGS -O2/" {gcc,libiberty}/configure
@@ -118,10 +140,6 @@ do_configure() {
 	else
 		if [ -z "$CHROOT_READY" ]; then
 			export LD_LIBRARY_PATH="${XBPS_MASTERDIR}/usr/lib"
-			_args+=" --with-gmp=${XBPS_MASTERDIR}/usr"
-			_args+=" --with-mpfr=${XBPS_MASTERDIR}/usr"
-			_args+=" --with-isl=${XBPS_MASTERDIR}/usr"
-			_args+=" --with-mpc=${XBPS_MASTERDIR}/usr"
 			_args+=" --build=${_triplet}"
 		else
 			_langs="c,c++,objc,obj-c++,fortran,lto"