package/gcc: fix fortran support

Fortran depends on libquadmath when available, make the buildroot
toolchain option depends on this new hidden symbol,

[Vincent: only do "HOST_GCC_FINAL_USR_LIBS += libquadmath" for i386 and
x86_64, otherwise it will fail saying "libquadmath.a: file not found"]

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gcc/Config.in.host

@@ -118,8 +118,15 @@ config BR2_TOOLCHAIN_BUILDROOT_CXX
 	  C++ language and you want C++ libraries to be installed on
 	  your target system.
 
+comment "Fortran support needs a toolchain w/ wchar"
+	depends on BR2_TOOLCHAIN_HAS_LIBQUADMATH
+	depends on !BR2_USE_WCHAR # libquadmath
+
 config BR2_TOOLCHAIN_BUILDROOT_FORTRAN
 	bool "Enable Fortran support"
+	# on architecture building libquadmath, wchar is required
+	depends on !BR2_TOOLCHAIN_HAS_LIBQUADMATH || \
+		(BR2_TOOLCHAIN_HAS_LIBQUADMATH && BR2_USE_WCHAR)
 	help
 	  Enable this option if you want your toolchain to support the
 	  Fortran language and you want Fortran libraries to be

package/gcc/gcc-final/gcc-final.mk

@@ -163,6 +163,10 @@ endif
 
 ifeq ($(BR2_TOOLCHAIN_BUILDROOT_FORTRAN),y)
 HOST_GCC_FINAL_USR_LIBS += libgfortran
+# fortran needs quadmath on x86 and x86_64
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBQUADMATH),y)
+HOST_GCC_FINAL_USR_LIBS += libquadmath
+endif
 endif
 
 ifeq ($(BR2_GCC_ENABLE_OPENMP),y)