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* [gcc/devel/omp/gcc-11] [WIP] OpenMP 5.0: requires directive: workaround to fix libgomp IntelMIC plugin build
@ 2021-05-13 16:20 Kwok Yeung
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From: Kwok Yeung @ 2021-05-13 16:20 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:6da4ffd4a790f5f0abf290147217ca46a36f981e
commit 6da4ffd4a790f5f0abf290147217ca46a36f981e
Author: Thomas Schwinge <thomas@codesourcery.com>
Date: Wed Mar 3 22:37:58 2021 +0100
[WIP] OpenMP 5.0: requires directive: workaround to fix libgomp IntelMIC plugin build
Fix-up for og10 commit c2e4a17adc0989f216c7fc3f93f150c66adba23a "OpenMP 5.0:
requires directive".
The GCC offloading target configurations don't build/use
'crtoffloadbegin.o'/'crtoffloadtable.o'/'crtoffloadend.o'
('libgcc/offloadstuff.c'), but the libgomp IntelMIC plugin still does link
against libgomp, and the latter unconditionally refers to
'__requires_mask_table', '__requires_mask_table_end':
make[3]: Entering directory '[...]/build-gcc-offload-x86_64-intelmicemul-linux-gnu/x86_64-intelmicemul-linux-gnu/liboffloadmic/plugin'
[...]/build-gcc-offload-x86_64-intelmicemul-linux-gnu/./gcc/xg++ [...] -loffloadmic_target -lcoi_device -lgomp -rdynamic ../ofldbegin.o offload_target_main.o ../ofldend.o -o offload_target_main
./../../libgomp/.libs/libgomp.so: undefined reference to `__requires_mask_table_end'
./../../libgomp/.libs/libgomp.so: undefined reference to `__requires_mask_table'
collect2: error: ld returned 1 exit status
Makefile:806: recipe for target 'offload_target_main' failed
make[3]: *** [offload_target_main] Error 1
I have not researched what a proper fix would look like.
libgomp/
* target.c (__requires_mask_table, __requires_mask_table_end): Add
'__attribute__((weak))'.
Diff:
---
libgomp/ChangeLog.omp | 5 +++++
libgomp/target.c | 2 ++
2 files changed, 7 insertions(+)
diff --git a/libgomp/ChangeLog.omp b/libgomp/ChangeLog.omp
index 0519191a936..db1d2bdac3a 100644
--- a/libgomp/ChangeLog.omp
+++ b/libgomp/ChangeLog.omp
@@ -1,3 +1,8 @@
+2021-03-25 Thomas Schwinge <thomas@codesourcery.com>
+
+ * target.c (__requires_mask_table, __requires_mask_table_end): Add
+ '__attribute__((weak))'.
+
2021-03-01 Kwok Cheung Yeung <kcy@codesourcery.com>
* testsuite/libgomp.c-c++-common/collapse-4.c: New.
diff --git a/libgomp/target.c b/libgomp/target.c
index af39d283608..2633ab1e43f 100644
--- a/libgomp/target.c
+++ b/libgomp/target.c
@@ -104,7 +104,9 @@ static unsigned int gomp_requires_mask;
/* Start/end of .gnu.gomp.requires section of program, defined in
crtoffloadbegin/end.o. */
+__attribute__((weak))
extern const unsigned int __requires_mask_table[];
+__attribute__((weak))
extern const unsigned int __requires_mask_table_end[];
/* Similar to gomp_realloc, but release register_lock before gomp_fatal. */
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