[Buildroot] [git commit] toolchain-external: add a check for OpenMP support

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=ef206d8cc71d05e8a82c03677145f3435fe5007a
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Signed-off-by: Ed Blake <ed.blake at sondrel.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
 toolchain/helpers.mk                                   | 18 ++++++++++++++++++
 toolchain/toolchain-external/pkg-toolchain-external.mk |  3 +++
 2 files changed, 21 insertions(+)

diff --git a/toolchain/helpers.mk b/toolchain/helpers.mk
index e5520c00c3..03355f56dd 100644
--- a/toolchain/helpers.mk
+++ b/toolchain/helpers.mk
@@ -359,6 +359,24 @@ check_fortran = \
 	fi ; \
 	rm -f $${__o}* \
 
+#
+#
+# Check that the external toolchain supports OpenMP
+#
+# $1: cross-gcc path
+#
+check_openmp = \
+	__CROSS_CC=$(strip $1) ; \
+	__o=$(BUILD_DIR)/.br-toolchain-test-openmp.tmp ; \
+	printf '\#include <omp.h>\nint main(void) { return omp_get_thread_num(); }' | \
+	$${__CROSS_CC} -fopenmp -x c -o $${__o} - ; \
+	if test $$? -ne 0 ; then \
+		rm -f $${__o}* ; \
+		echo "OpenMP support is selected but is not available in external toolchain"; \
+		exit 1 ; \
+	fi ; \
+	rm -f $${__o}* \
+
 #
 # Check that the cross-compiler given in the configuration exists
 #
diff --git a/toolchain/toolchain-external/pkg-toolchain-external.mk b/toolchain/toolchain-external/pkg-toolchain-external.mk
index 747837fdc6..baf719ad1f 100644
--- a/toolchain/toolchain-external/pkg-toolchain-external.mk
+++ b/toolchain/toolchain-external/pkg-toolchain-external.mk
@@ -545,6 +545,9 @@ define $(2)_CONFIGURE_CMDS
 	if test "$$(BR2_TOOLCHAIN_HAS_FORTRAN)" = "y" ; then \
 		$$(call check_fortran,$$(TOOLCHAIN_EXTERNAL_FC)) ; \
 	fi ; \
+	if test "$$(BR2_TOOLCHAIN_HAS_OPENMP)" = "y" ; then \
+		$$(call check_openmp,$$(TOOLCHAIN_EXTERNAL_CC)) ; \
+	fi ; \
 	if test "$$(BR2_TOOLCHAIN_EXTERNAL_UCLIBC)" = "y" ; then \
 		$$(call check_uclibc,$$$${SYSROOT_DIR}) ; \
 	elif test "$$(BR2_TOOLCHAIN_EXTERNAL_MUSL)" = "y" ; then \